diff --git "a/demonstrations/dfmvlxx/axtrees/page-28-0.json" "b/demonstrations/dfmvlxx/axtrees/page-28-0.json"
new file mode 100644--- /dev/null
+++ "b/demonstrations/dfmvlxx/axtrees/page-28-0.json"
@@ -0,0 +1 @@
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We can thank "}}]}, "properties": [], "parentId": "515", "childIds": [], "backendDOMNodeId": 411}, {"nodeId": "880", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "organic chemistry", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "organic chemistry"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "515", "childIds": ["1631"], "backendDOMNodeId": 412, "browsergym_id": "a86ac66a-82ba-421e"}, {"nodeId": "881", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " for much of what makes life easier in the modern age: fuel for cars, for instance, or the plastics found in many of the products used in an average day.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " for much of what makes life easier in the modern age: fuel for cars, for instance, or the plastics found in many of the products used in an average day."}}]}, "properties": [], "parentId": "515", "childIds": [], "backendDOMNodeId": 414}, {"nodeId": "882", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "HOW IT WORKS", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "HOW IT WORKS"}}]}, "properties": [], "parentId": "516", "childIds": [], "backendDOMNodeId": 416}, {"nodeId": "883", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Introduction to Carbon", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Introduction to Carbon"}}]}, "properties": [], "parentId": "517", "childIds": [], "backendDOMNodeId": 418}, {"nodeId": "884", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "As the element essential to all of life, and hence the basis for a vast field of study, carbon is addressed in its own essay. 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If the electronegativity values of the two elements involved are equal, then they share the electrons equally; but if one element has a higher electronegativity value, the electrons will be more drawn to that element.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", in which two uncharged atoms share eight valence electrons. If the electronegativity values of the two elements involved are equal, then they share the electrons equally; but if one element has a higher electronegativity value, the electrons will be more drawn to that element."}}]}, "properties": [], "parentId": "525", "childIds": [], "backendDOMNodeId": 484}, {"nodeId": "924", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "The electronegativity of carbon is certainly not the highest on the periodic table. That distinction belongs to fluorine, with an electronegativity value of 4.0, which makes it the most reactive of all elements. Fluorine is at the head of Group 7, the halogens, all of which are highly reactive and most of which have high electronegativity values. If one ignores the noble gases, which are virtually unreactive and occupy the extreme right-hand side of the periodic table, electronegativity values are highest in the upper right-hand side of the table", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "The electronegativity of carbon is certainly not the highest on the periodic table. That distinction belongs to fluorine, with an electronegativity value of 4.0, which makes it the most reactive of all elements. Fluorine is at the head of Group 7, the halogens, all of which are highly reactive and most of which have high electronegativity values. If one ignores the noble gases, which are virtually unreactive and occupy the extreme right-hand side of the periodic table, electronegativity values are highest in the upper right-hand side of the table"}}]}, "properties": [], "parentId": "526", "childIds": [], "backendDOMNodeId": 486}, {"nodeId": "925", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "526", "childIds": ["1650"], "backendDOMNodeId": 487, "browsergym_id": "f8730ba5-3bdf-40bf"}, {"nodeId": "926", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "the location of fluorine", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "the location of fluorine"}}]}, "properties": [], "parentId": "526", "childIds": [], "backendDOMNodeId": 489}, {"nodeId": "927", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "526", "childIds": ["1651"], "backendDOMNodeId": 490, "browsergym_id": "763d7c57-3f74-4d42"}, {"nodeId": "928", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "and lowest in the lower left. In other words, the value increases with group or column number (again, leaving out the noble gases in Group 8), and decreases with period or row number.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "and lowest in the lower left. 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Thus its electronegativity is high, without being too high. Fluorine is not likely to form the long chains for which is carbon is known, simply because its electronegativity is so high, it overpowers other elements with which it comes into contact. In addition, with four valence electrons, carbon is ideally suited to find other elements (or other carbon atoms) for forming covalent bonds according to the octet rule, whereby most elements bond so that they have eight valence electrons.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "With an electronegativity of 2.5, carbon ties with sulfur and iodine (a halogen) for sixth place, behind only fluorine; oxygen (3.5); nitrogen and chlorine (3.0); and bromine (2.8). Thus its electronegativity is high, without being too high. Fluorine is not likely to form the long chains for which is carbon is known, simply because its electronegativity is so high, it overpowers other elements with which it comes into contact. In addition, with four valence electrons, carbon is ideally suited to find other elements (or other carbon atoms) for forming covalent bonds according to the octet rule, whereby most elements bond so that they have eight valence electrons."}}]}, "properties": [], "parentId": "528", "childIds": [], "backendDOMNodeId": 497}, {"nodeId": "931", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Carbon's Multiple Bonds", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Carbon's Multiple Bonds"}}]}, "properties": [], "parentId": "529", "childIds": [], "backendDOMNodeId": 499}, {"nodeId": "932", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Carbon", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Carbon"}}]}, "properties": [], "parentId": "530", "childIds": [], "backendDOMNodeId": 501}, {"nodeId": "933", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "530", "childIds": ["1653"], "backendDOMNodeId": 502, "browsergym_id": "0213685a-ebbd-4032"}, {"nodeId": "934", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "with its four valence electrons", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "with its four valence electrons"}}]}, "properties": [], "parentId": "530", "childIds": [], "backendDOMNodeId": 504}, {"nodeId": "935", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "530", "childIds": ["1654"], "backendDOMNodeId": 505, "browsergym_id": "d7ce6d4d-e2a1-452b"}, {"nodeId": "936", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "happens to be tetravalent, or capable of bonding to four other atoms at once. It is not necessarily the case that an element has the ability to bond with as many other elements as it has valence electrons; in fact, this is rarely the case. Additionally, carbon is capable of forming not only a single bond, with one pair of shared valence electrons, but a double bond (two pairs) or even a triple bond (three pairs.)", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "happens to be tetravalent, or capable of bonding to four other atoms at once. It is not necessarily the case that an element has the ability to bond with as many other elements as it has valence electrons; in fact, this is rarely the case. Additionally, carbon is capable of forming not only a single bond, with one pair of shared valence electrons, but a double bond (two pairs) or even a triple bond (three pairs.)"}}]}, "properties": [], "parentId": "530", "childIds": [], "backendDOMNodeId": 507}, {"nodeId": "937", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Another special property of carbon is its ability to bond in long chains that constitute strings of carbons and other atoms. Furthermore, though sometimes carbon forms a typical molecule (for example, ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Another special property of carbon is its ability to bond in long chains that constitute strings of carbons and other atoms. 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This leaves a huge array of compounds to be studied, as we shall see.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ". This leaves a huge array of compounds to be studied, as we shall see."}}]}, "properties": [], "parentId": "534", "childIds": [], "backendDOMNodeId": 527}, {"nodeId": "949", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "The term \"organic\" in everyday language connotes \"living,\" but organic chemistry is involved with plenty of compounds not part of living organisms: petroleum, for instance, is an organic compound that ultimately comes from the decayed bodies of organisms that once were alive. It should be stressed that organic compounds do not have to be produced by living things, or even by things that once were alive; they can be produced artificially in a laboratory.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "The term \"organic\" in everyday language connotes \"living,\" but organic chemistry is involved with plenty of compounds not part of living organisms: petroleum, for instance, is an organic compound that ultimately comes from the decayed bodies of organisms that once were alive. It should be stressed that organic compounds do not have to be produced by living things, or even by things that once were alive; they can be produced artificially in a laboratory."}}]}, "properties": [], "parentId": "535", "childIds": [], "backendDOMNodeId": 529}, {"nodeId": "950", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "The breakthrough event in organic chemistry came in 1828, when German chemist Friedrich W", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "The breakthrough event in organic chemistry came in 1828, when German chemist Friedrich W"}}]}, "properties": [], "parentId": "536", "childIds": [], "backendDOMNodeId": 531}, {"nodeId": "951", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "536", "childIds": ["1659"], "backendDOMNodeId": 532, "browsergym_id": "4648fb99-d135-4511"}, {"nodeId": "952", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "hler (1800-1882) heated a sample of ammonium cyanate (NH", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "hler (1800-1882) heated a sample of ammonium cyanate (NH"}}]}, "properties": [], "parentId": "536", "childIds": [], "backendDOMNodeId": 534}, {"nodeId": "953", "ignored": false, "role": {"type": "role", "value": "subscript"}, "chromeRole": {"type": "internalRole", "value": 185}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "536", "childIds": ["1660"], "backendDOMNodeId": 535, "browsergym_id": "ee1244eb-7616-465b"}, {"nodeId": "954", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "OCN) and converted it to urea (H", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "OCN) and converted it to urea (H"}}]}, "properties": [], "parentId": "536", "childIds": [], "backendDOMNodeId": 537}, {"nodeId": "955", "ignored": false, "role": {"type": "role", "value": "subscript"}, "chromeRole": {"type": "internalRole", "value": 185}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "536", "childIds": ["1661"], "backendDOMNodeId": 538, "browsergym_id": "7ecc4da7-195c-48bb"}, {"nodeId": "956", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "N-CO-NH", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "N-CO-NH"}}]}, "properties": [], "parentId": "536", "childIds": [], "backendDOMNodeId": 540}, {"nodeId": "957", "ignored": false, "role": {"type": "role", "value": "subscript"}, "chromeRole": {"type": "internalRole", "value": 185}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "536", "childIds": ["1662"], "backendDOMNodeId": 541, "browsergym_id": "ae2f706f-c6f8-4adb"}, {"nodeId": "958", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "). Ammonium cyanite is an inorganic material, whereas urea, a waste product in the urine of mammals, is an organic one. \"Without benefit of a kidney, a bladder, or a dog,\" as W", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "). Ammonium cyanite is an inorganic material, whereas urea, a waste product in the urine of mammals, is an organic one. \"Without benefit of a kidney, a bladder, or a dog,\" as W"}}]}, "properties": [], "parentId": "536", "childIds": [], "backendDOMNodeId": 543}, {"nodeId": "959", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "536", "childIds": ["1663"], "backendDOMNodeId": 544, "browsergym_id": "ba85ce19-8bf8-4888"}, {"nodeId": "960", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "hler later said, he had managed to transform an inorganic substance into an organic one.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "hler later said, he had managed to transform an inorganic substance into an organic one."}}]}, "properties": [], "parentId": "536", "childIds": [], "backendDOMNodeId": 546}, {"nodeId": "961", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Ammonium cyanate and urea are isomers: substances having the same formula, but possessing different chemical properties. Thus they have exactly the same numbers and proportions of atoms, yet these atoms are arranged in different ways. In urea, the carbon forms an organic chain, and in ammonium cyanate, it does not. Thus, to reduce the specifics of organic chemistry even further, this discipline can be said to constitute the study of carbon chains, and ways to rearrange them to create new substances.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Ammonium cyanate and urea are isomers: substances having the same formula, but possessing different chemical properties. Thus they have exactly the same numbers and proportions of atoms, yet these atoms are arranged in different ways. In urea, the carbon forms an organic chain, and in ammonium cyanate, it does not. Thus, to reduce the specifics of organic chemistry even further, this discipline can be said to constitute the study of carbon chains, and ways to rearrange them to create new substances."}}]}, "properties": [], "parentId": "538", "childIds": [], "backendDOMNodeId": 549}, {"nodeId": "962", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "REAL-LIFE APPLICATIONS", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "REAL-LIFE APPLICATIONS"}}]}, "properties": [], "parentId": "539", "childIds": [], "backendDOMNodeId": 551}, {"nodeId": "963", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Organic Chemistry and Modern Life", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Organic Chemistry and Modern Life"}}]}, "properties": [], "parentId": "540", "childIds": [], "backendDOMNodeId": 553}, {"nodeId": "964", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "At first glance, the term \"organic chemistry\" might sound like something removed from everyday life, but this could not be further from the truth. The reality of the role played by organic chemistry in modern existence is summed up in a famous advertising slogan used by E. I. du Pont de Nemours and Company (usually referred to as \"du Pont\"): \"Better Things for Better Living Through Chemistry.\"", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "At first glance, the term \"organic chemistry\" might sound like something removed from everyday life, but this could not be further from the truth. The reality of the role played by organic chemistry in modern existence is summed up in a famous advertising slogan used by E. I. du Pont de Nemours and Company (usually referred to as \"du Pont\"): \"Better Things for Better Living Through Chemistry.\""}}]}, "properties": [], "parentId": "541", "childIds": [], "backendDOMNodeId": 555}, {"nodeId": "965", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Often rendered simply as \"Better Living Through Chemistry,\" the advertising campaign made its debut in 1938, just as du Pont introduced a revolutionary product of organic chemistry: nylon, the creation of a brilliant young chemist named Wallace Carothers (1896-1937). Nylon, an example of a polymer (discussed below), started a revolution in plastics that was still unfolding three decades later, in 1967. That was the year of the film ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Often rendered simply as \"Better Living Through Chemistry,\" the advertising campaign made its debut in 1938, just as du Pont introduced a revolutionary product of organic chemistry: nylon, the creation of a brilliant young chemist named Wallace Carothers (1896-1937). Nylon, an example of a polymer (discussed below), started a revolution in plastics that was still unfolding three decades later, in 1967. 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Instead, Ben puts his attention into other things, quite removed from \"plastics,\" and much of the plot revolves around his revolt against what he perceives as the \"plastic\" (that is, artificial) character of modern life.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "The meaning of this interchange was that plastics were the wave of the future, and that an intelligent young man such as Ben should invest his energies in this promising new field. Instead, Ben puts his attention into other things, quite removed from \"plastics,\" and much of the plot revolves around his revolt against what he perceives as the \"plastic\" (that is, artificial) character of modern life."}}]}, "properties": [], "parentId": "545", "childIds": [], "backendDOMNodeId": 585}, {"nodeId": "976", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "In this way, ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "In this way, "}}]}, "properties": [], "parentId": "546", "childIds": [], "backendDOMNodeId": 587}, {"nodeId": "977", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "546", "childIds": ["1678"], "backendDOMNodeId": 588, "browsergym_id": "28755e9c-0545-4c4e"}, {"nodeId": "978", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " spoke for a whole generation that had become ambivalent concerning \"better living through chemistry,\" a phrase that eventually was perceived as ironic in view of concerns about the environment and the many artificial products that make up modern life. 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Responding to this ambivalence, du Pont dropped the slogan in the late 1970s; yet the reality is that people truly do enjoy \"better living through chemistry\""}}]}, "properties": [], "parentId": "546", "childIds": [], "backendDOMNodeId": 590}, {"nodeId": "979", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "546", "childIds": ["1679"], "backendDOMNodeId": 591, "browsergym_id": "204f0e04-1d7b-436c"}, {"nodeId": "980", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "particularly organic chemistry.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "particularly organic chemistry."}}]}, "properties": [], "parentId": "546", "childIds": [], "backendDOMNodeId": 593}, {"nodeId": "981", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "APPLICATIONS OF ORGANIC CHEMISTRY.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "APPLICATIONS OF ORGANIC CHEMISTRY."}}]}, "properties": [], "parentId": "548", "childIds": [], "backendDOMNodeId": 596}, {"nodeId": "982", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "What would the world be like without the fruits of organic chemistry? 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Aspirins and all types of other drugs; preservatives that keep food from spoiling; perfumes and toiletries; dyes and flavorings"}}]}, "properties": [], "parentId": "549", "childIds": [], "backendDOMNodeId": 598}, {"nodeId": "983", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "549", "childIds": ["1680"], "backendDOMNodeId": 599, "browsergym_id": "e470580b-5d17-44fd"}, {"nodeId": "984", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "all these things would have to go as well.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "all these things would have to go as well."}}]}, "properties": [], "parentId": "549", "childIds": [], "backendDOMNodeId": 601}, {"nodeId": "985", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "Synthetic fibers", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "Synthetic fibers"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "550", "childIds": ["1681"], "backendDOMNodeId": 603, "browsergym_id": "c140f97e-4ec5-4a9b"}, {"nodeId": "986", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " such as nylon", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " such as nylon"}}]}, "properties": [], "parentId": "550", "childIds": [], "backendDOMNodeId": 605}, {"nodeId": "987", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "550", "childIds": ["1682"], "backendDOMNodeId": 606, "browsergym_id": "e40c0446-cc46-4e8d"}, {"nodeId": "988", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "used in everything from toothbrushes to parachutes", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "used in everything from toothbrushes to parachutes"}}]}, "properties": [], "parentId": "550", "childIds": [], "backendDOMNodeId": 608}, {"nodeId": "989", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "550", "childIds": ["1683"], "backendDOMNodeId": 609, "browsergym_id": "8a2ae41d-9a97-4f87"}, {"nodeId": "990", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "would be out of the picture if it were not for the enormous progress made by organic chemistry. The same is true of plastics or polymers in general, which have literally hundreds upon hundreds of applications. Indeed, it is virtually impossible for a person in twenty-first century America to spend an entire day without coming into contact with at least one, and more likely dozens, of plastic products. Car parts, toys, computer housings, Velcro fasteners, PVC (", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "would be out of the picture if it were not for the enormous progress made by organic chemistry. The same is true of plastics or polymers in general, which have literally hundreds upon hundreds of applications. Indeed, it is virtually impossible for a person in twenty-first century America to spend an entire day without coming into contact with at least one, and more likely dozens, of plastic products. 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Not only does carbon form itself into apparently limitless molecular shapes, but hydrogen is a particularly good partner. It has the smallest atom of any element on the periodic table, and therefore it can bond to one of carbon's valence electrons without getting in the way of the other three.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Theoretically, there is no limit to the number of possible hydrocarbons. Not only does carbon form itself into apparently limitless molecular shapes, but hydrogen is a particularly good partner. It has the smallest atom of any element on the periodic table, and therefore it can bond to one of carbon's valence electrons without getting in the way of the other three."}}]}, "properties": [], "parentId": "556", "childIds": [], "backendDOMNodeId": 640}, {"nodeId": "1008", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "There are two basic varieties of hydrocarbon, distinguished by shape: aliphatic and aromatic. The first of these forms straight or branched chains, as well as rings, while the second forms only benzene rings, discussed below. Within the aliphatic hydrocarbons are three varieties: those that form single bonds (alkanes), double bonds (alkenes), and triple bonds (alkynes.)", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "There are two basic varieties of hydrocarbon, distinguished by shape: aliphatic and aromatic. The first of these forms straight or branched chains, as well as rings, while the second forms only benzene rings, discussed below. Within the aliphatic hydrocarbons are three varieties: those that form single bonds (alkanes), double bonds (alkenes), and triple bonds (alkynes.)"}}]}, "properties": [], "parentId": "558", "childIds": [], "backendDOMNodeId": 643}, {"nodeId": "1009", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "ALKANES.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "ALKANES."}}]}, "properties": [], "parentId": "559", "childIds": [], "backendDOMNodeId": 645}, {"nodeId": "1010", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "The alkanes are also known as saturated hydrocarbons, because all the bonds not used to make the skeleton itself are filled to their capacity (that is, saturated) with hydrogen atoms. The formula for any alkane is C", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "The alkanes are also known as saturated hydrocarbons, because all the bonds not used to make the skeleton itself are filled to their capacity (that is, saturated) with hydrogen atoms. The formula for any alkane is C"}}]}, "properties": [], "parentId": "560", "childIds": [], "backendDOMNodeId": 647}, {"nodeId": "1011", "ignored": false, "role": {"type": "role", "value": "subscript"}, "chromeRole": {"type": "internalRole", "value": 185}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "560", "childIds": ["1690"], "backendDOMNodeId": 648, "browsergym_id": "c8e5e360-7c9c-45fd"}, {"nodeId": "1012", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "H", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "H"}}]}, "properties": [], "parentId": "560", "childIds": [], "backendDOMNodeId": 650}, {"nodeId": "1013", "ignored": false, "role": {"type": "role", "value": "subscript"}, "chromeRole": {"type": "internalRole", "value": 185}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "560", "childIds": ["1691"], "backendDOMNodeId": 651, "browsergym_id": "d132b692-276c-48ad"}, {"nodeId": "1014", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", where n is the number of carbon atoms. 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"StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "The reader will undoubtedly notice a number of familiar names on this list. The first four, being the lowest in molecular mass, are gases at room temperature, while the heavier ones are oily liquids. Alkanes even heavier than those on this list tend to be waxy solids, an example being paraffin wax, for making candles. It should be noted that from butane on up, the alkanes have numerous structural isomers, depending on whether they are straight or branched, and these isomers have differing chemical properties.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "The reader will undoubtedly notice a number of familiar names on this list. The first four, being the lowest in molecular mass, are gases at room temperature, while the heavier ones are oily liquids. Alkanes even heavier than those on this list tend to be waxy solids, an example being paraffin wax, for making candles. It should be noted that from butane on up, the alkanes have numerous structural isomers, depending on whether they are straight or branched, and these isomers have differing chemical properties."}}]}, "properties": [], "parentId": "564", "childIds": [], "backendDOMNodeId": 731}, {"nodeId": "1027", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Branched alkanes are named by indicating the branch attached to the principal chain. Branches, known as substituents, are named by taking the name of an alkane and replacing the suffix with yl", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Branched alkanes are named by indicating the branch attached to the principal chain. Branches, known as substituents, are named by taking the name of an alkane and replacing the suffix with yl"}}]}, "properties": [], "parentId": "565", "childIds": [], "backendDOMNodeId": 733}, {"nodeId": "1028", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "565", "childIds": ["1739"], "backendDOMNodeId": 734, "browsergym_id": "6a4e916b-4cfc-47d5"}, {"nodeId": "1029", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "for example, methyl, ethyl, and so on. The general term for an alkane which functions as a substituent is alkyl.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "for example, methyl, ethyl, and so on. The general term for an alkane which functions as a substituent is alkyl."}}]}, "properties": [], "parentId": "565", "childIds": [], "backendDOMNodeId": 736}, {"nodeId": "1030", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Cycloalkanes are alkanes joined in a closed loop to form a ring-shaped molecule. They are named by using the names above, with cyclo-as a prefix. These start with propane, or rather cyclopropane, which has the minimum number of carbon atoms to form a closed shape: three atoms, forming a triangle.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Cycloalkanes are alkanes joined in a closed loop to form a ring-shaped molecule. They are named by using the names above, with cyclo-as a prefix. These start with propane, or rather cyclopropane, which has the minimum number of carbon atoms to form a closed shape: three atoms, forming a triangle."}}]}, "properties": [], "parentId": "567", "childIds": [], "backendDOMNodeId": 739}, {"nodeId": "1031", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "ALKENES AND ALKYNES.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "ALKENES AND ALKYNES."}}]}, "properties": [], "parentId": "568", "childIds": [], "backendDOMNodeId": 741}, {"nodeId": "1032", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "The names of the alkenes, hydrocarbons that contain one or more double bonds per molecule, are parallel to those of the alkanes, but the family ending is-ene. 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Both alkenes and alkynes, discussed below, are unsaturated", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ". Both alkenes and alkynes, discussed below, are unsaturated"}}]}, "properties": [], "parentId": "569", "childIds": [], "backendDOMNodeId": 749}, {"nodeId": "1037", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "569", "childIds": ["1742"], "backendDOMNodeId": 750, "browsergym_id": "56c55dd4-84c9-44f1"}, {"nodeId": "1038", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "in other words, some of the carbon atoms in them are free to form other bonds. Alkenes with more than one double bond are referred to as being polyunsaturated.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "in other words, some of the carbon atoms in them are free to form other bonds. Alkenes with more than one double bond are referred to as being polyunsaturated."}}]}, "properties": [], "parentId": "569", "childIds": [], "backendDOMNodeId": 752}, {"nodeId": "1039", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "As with the alkenes, the names of alkynes (hydrocarbons containing one or more triple bonds per molecule) are parallel to those of the alkanes, only with the replacement of the suffix -yne in place of-ane. 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The formula for alkenes is C"}}]}, "properties": [], "parentId": "570", "childIds": [], "backendDOMNodeId": 754}, {"nodeId": "1040", "ignored": false, "role": {"type": "role", "value": "subscript"}, "chromeRole": {"type": "internalRole", "value": 185}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "570", "childIds": ["1743"], "backendDOMNodeId": 755, "browsergym_id": "bde9b29e-3256-413f"}, {"nodeId": "1041", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "H", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "H"}}]}, "properties": [], "parentId": "570", "childIds": [], "backendDOMNodeId": 757}, {"nodeId": "1042", "ignored": false, "role": {"type": "role", "value": "subscript"}, "chromeRole": {"type": "internalRole", "value": 185}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "570", "childIds": ["1744"], "backendDOMNodeId": 758, "browsergym_id": "e11630d4-0d64-48d6"}, {"nodeId": "1043", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ". Among the members of this group are acetylene, or C", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ". 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Plastic polystyrene is another important product from this division of the hydrocarbon family.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", used for welding steel. 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A crystalline solid with a powerful odor, it is found in mothballs and various deodorant-disinfectants.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", and used in the synthesis of other compounds. A crystalline solid with a powerful odor, it is found in mothballs and various deodorant-disinfectants."}}]}, "properties": [], "parentId": "574", "childIds": [], "backendDOMNodeId": 782}, {"nodeId": "1057", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "PETROCHEMICALS.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "PETROCHEMICALS."}}]}, "properties": [], "parentId": "575", "childIds": [], "backendDOMNodeId": 784}, {"nodeId": "1058", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "As for petro-chemicals, these are simply derivatives of petroleum, itself a mixture of alkanes with some alkenes, as well as aromatic hydrocarbons. Through a process known as fractional distillation, the petrochemicals of the lowest molecular mass boil off first, and those having higher mass separate at higher temperatures.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "As for petro-chemicals, these are simply derivatives of petroleum, itself a mixture of alkanes with some alkenes, as well as aromatic hydrocarbons. Through a process known as fractional distillation, the petrochemicals of the lowest molecular mass boil off first, and those having higher mass separate at higher temperatures."}}]}, "properties": [], "parentId": "576", "childIds": [], "backendDOMNodeId": 786}, {"nodeId": "1059", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Among the products derived from the fractional distillation of petroleum are the following, listed from the lowest temperature range (that is, the first material to be separated) to the highest: natural gas; petroleum ether, a solvent; naphtha, a solvent (used for example in paint thinner); gasoline; kerosene; fuel for heating and diesel fuel; lubricating oils; petroleum jelly; paraffin wax; and pitch, or tar. A host of other organic chemicals, including various drugs, plastics, paints, adhesives, fibers, detergents, synthetic rubber, and agricultural chemicals, owe their existence to petrochemicals.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Among the products derived from the fractional distillation of petroleum are the following, listed from the lowest temperature range (that is, the first material to be separated) to the highest: natural gas; petroleum ether, a solvent; naphtha, a solvent (used for example in paint thinner); gasoline; kerosene; fuel for heating and diesel fuel; lubricating oils; petroleum jelly; paraffin wax; and pitch, or tar. A host of other organic chemicals, including various drugs, plastics, paints, adhesives, fibers, detergents, synthetic rubber, and agricultural chemicals, owe their existence to petrochemicals."}}]}, "properties": [], "parentId": "578", "childIds": [], "backendDOMNodeId": 789}, {"nodeId": "1060", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Obviously, petroleum is not just for making gasoline, though of course this is the first product people think of when they hear the word \"petroleum.\" Not all hydrocarbons in gasoline are desirable. Straight-chain or normal heptane, for instance, does not fire smoothly in an ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Obviously, petroleum is not just for making gasoline, though of course this is the first product people think of when they hear the word \"petroleum.\" Not all hydrocarbons in gasoline are desirable. Straight-chain or normal heptane, for instance, does not fire smoothly in an "}}]}, "properties": [], "parentId": "579", "childIds": [], "backendDOMNodeId": 791}, {"nodeId": "1061", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "internal-combustion engine", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "internal-combustion engine"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "579", "childIds": ["1750"], "backendDOMNodeId": 792, "browsergym_id": "552344b5-8250-42c0"}, {"nodeId": "1062", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", and therefore disrupts the engine's rhythm. For this reason, it is given a rating of zero on a scale of desirability, while octane has a rating of 100. This is why gas stations list octane ratings at the pump: the higher the presence of octane, the better the gas is for one's automobile.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", and therefore disrupts the engine's rhythm. For this reason, it is given a rating of zero on a scale of desirability, while octane has a rating of 100. This is why gas stations list octane ratings at the pump: the higher the presence of octane, the better the gas is for one's automobile."}}]}, "properties": [], "parentId": "579", "childIds": [], "backendDOMNodeId": 794}, {"nodeId": "1063", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Hydrocarbon Derivatives", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Hydrocarbon Derivatives"}}]}, "properties": [], "parentId": "580", "childIds": [], "backendDOMNodeId": 796}, {"nodeId": "1064", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "With carbon and hydrogen as the backbone, the hydrocarbons are capable of forming a vast array of hydrocarbon derivatives by combining with other elements. These other elements are arranged in functional groups", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "With carbon and hydrogen as the backbone, the hydrocarbons are capable of forming a vast array of hydrocarbon derivatives by combining with other elements. These other elements are arranged in functional groups"}}]}, "properties": [], "parentId": "581", "childIds": [], "backendDOMNodeId": 798}, {"nodeId": "1065", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "581", "childIds": ["1751"], "backendDOMNodeId": 799, "browsergym_id": "8903d3cc-8648-4b88"}, {"nodeId": "1066", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "an atom or group of atoms whose presence identifies a specific family of compounds. Below we will briefly discuss some of the principal hydrocarbon derivatives, which are basically hydrocarbons with the addition of other molecules or single atoms.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "an atom or group of atoms whose presence identifies a specific family of compounds. Below we will briefly discuss some of the principal hydrocarbon derivatives, which are basically hydrocarbons with the addition of other molecules or single atoms."}}]}, "properties": [], "parentId": "581", "childIds": [], "backendDOMNodeId": 801}, {"nodeId": "1067", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Alcohols are oxygen-hydrogen molecules wedded to hydrocarbons. The two most important commercial types of alcohol are methanol, or wood alcohol; and ethanol, which is found in alcoholic beverages, such as beer, wine, and liquor. Though methanol is still known as \"wood alcohol,\" it is no longer obtained by heating wood, but rather by the industrial hydrogenation of carbon monoxide. Used in adhesives, fibers, and plastics, it can also be applied as a fuel. Ethanol, too, can be burned in an ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Alcohols are oxygen-hydrogen molecules wedded to hydrocarbons. The two most important commercial types of alcohol are methanol, or wood alcohol; and ethanol, which is found in alcoholic beverages, such as beer, wine, and liquor. Though methanol is still known as \"wood alcohol,\" it is no longer obtained by heating wood, but rather by the industrial hydrogenation of carbon monoxide. Used in adhesives, fibers, and plastics, it can also be applied as a fuel. Ethanol, too, can be burned in an "}}]}, "properties": [], "parentId": "583", "childIds": [], "backendDOMNodeId": 804}, {"nodeId": "1068", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "internal-combustion engine", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "internal-combustion engine"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "583", "childIds": ["1752"], "backendDOMNodeId": 805, "browsergym_id": "1a5846b6-7f71-43a2"}, {"nodeId": "1069", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", when combined with gasoline to make gasohol. Another significant alcohol is cholesterol, found in most living organisms. Though biochemically important, cholesterol can pose a risk to human health.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", when combined with gasoline to make gasohol. Another significant alcohol is cholesterol, found in most living organisms. Though biochemically important, cholesterol can pose a risk to human health."}}]}, "properties": [], "parentId": "583", "childIds": [], "backendDOMNodeId": 807}, {"nodeId": "1070", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Aldehydes and ketones both involve a double-bonded carbon-oxygen molecule, known as a ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Aldehydes and ketones both involve a double-bonded carbon-oxygen molecule, known as a "}}]}, "properties": [], "parentId": "584", "childIds": [], "backendDOMNodeId": 809}, {"nodeId": "1071", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "carbonyl group", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "carbonyl group"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "584", "childIds": ["1753"], "backendDOMNodeId": 810, "browsergym_id": "91e2cfe8-2524-499b"}, {"nodeId": "1072", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ". In a ketone, the ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ". In a ketone, the "}}]}, "properties": [], "parentId": "584", "childIds": [], "backendDOMNodeId": 812}, {"nodeId": "1073", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "carbonyl group", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "carbonyl group"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "584", "childIds": ["1754"], "backendDOMNodeId": 813, "browsergym_id": "90306abb-043b-4091"}, {"nodeId": "1074", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " bonds to two hydrocarbons, while in an aldehyde, the carbonyl group is always at the end of a hydrocarbon chain. Therefore, instead of two hydrocarbons, there is always a hydrocarbon and at least one other hydrogen bonded to the carbon atom in the carbonyl. One prominent example of a ketone is acetone, used in nail polish remover. Aldehydes often appear in nature", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " bonds to two hydrocarbons, while in an aldehyde, the carbonyl group is always at the end of a hydrocarbon chain. Therefore, instead of two hydrocarbons, there is always a hydrocarbon and at least one other hydrogen bonded to the carbon atom in the carbonyl. One prominent example of a ketone is acetone, used in nail polish remover. Aldehydes often appear in nature"}}]}, "properties": [], "parentId": "584", "childIds": [], "backendDOMNodeId": 815}, {"nodeId": "1075", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "584", "childIds": ["1755"], "backendDOMNodeId": 816, "browsergym_id": "e03cf65c-b7b3-4a8c"}, {"nodeId": "1076", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "for instance, as vanillin, which gives vanilla beans their pleasing aroma. The ketones carvone and camphor impart the characteristic flavors of spearmint leaves and caraway seeds.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "for instance, as vanillin, which gives vanilla beans their pleasing aroma. The ketones carvone and camphor impart the characteristic flavors of spearmint leaves and caraway seeds."}}]}, "properties": [], "parentId": "584", "childIds": [], "backendDOMNodeId": 818}, {"nodeId": "1077", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "CARBOXYLIC ACIDS AND ESTERS.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "CARBOXYLIC ACIDS AND ESTERS."}}]}, "properties": [], "parentId": "586", "childIds": [], "backendDOMNodeId": 821}, {"nodeId": "1078", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Carboxylic acids all have in common what is known as a ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Carboxylic acids all have in common what is known as a "}}]}, "properties": [], "parentId": "587", "childIds": [], "backendDOMNodeId": 823}, {"nodeId": "1079", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "carboxyl group", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "carboxyl group"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "587", "childIds": ["1756"], "backendDOMNodeId": 824, "browsergym_id": "ffa3da1d-5606-4cc7"}, {"nodeId": "1080", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", designated by the symbol -COOH. This consists of a carbon atom with a double bond to an oxygen atom, and a single bond to another oxygen atom that is, in turn, wedded to a hydrogen. All carboxylic acids can be generally symbolized by RCOOH, with R as the standard designation of any hydrocarbon. Lactic acid, generated by the human body, is a ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", designated by the symbol -COOH. This consists of a carbon atom with a double bond to an oxygen atom, and a single bond to another oxygen atom that is, in turn, wedded to a hydrogen. All carboxylic acids can be generally symbolized by RCOOH, with R as the standard designation of any hydrocarbon. Lactic acid, generated by the human body, is a "}}]}, "properties": [], "parentId": "587", "childIds": [], "backendDOMNodeId": 826}, {"nodeId": "1081", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "carboxylic acid", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "carboxylic acid"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "587", "childIds": ["1757"], "backendDOMNodeId": 827, "browsergym_id": "9b8be230-66bf-42bc"}, {"nodeId": "1082", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ": when a person overexerts, the muscles generate ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ": when a person overexerts, the muscles generate "}}]}, "properties": [], "parentId": "587", "childIds": [], "backendDOMNodeId": 829}, {"nodeId": "1083", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "lactic acid", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "lactic acid"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "587", "childIds": ["1758"], "backendDOMNodeId": 830, "browsergym_id": "d3b103d3-3f71-459c"}, {"nodeId": "1084", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", resulting in a feeling of fatigue until the body converts the acid to water and carbon dioxide. Another example of a ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", resulting in a feeling of fatigue until the body converts the acid to water and carbon dioxide. Another example of a "}}]}, "properties": [], "parentId": "587", "childIds": [], "backendDOMNodeId": 832}, {"nodeId": "1085", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "carboxylic acid", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "carboxylic acid"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "587", "childIds": ["1759"], "backendDOMNodeId": 833, "browsergym_id": "b000176b-051d-400b"}, {"nodeId": "1086", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " is ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " is "}}]}, "properties": [], "parentId": "587", "childIds": [], "backendDOMNodeId": 835}, {"nodeId": "1087", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "butyric acid", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "butyric acid"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "587", "childIds": ["1760"], "backendDOMNodeId": 836, "browsergym_id": "246acf5c-0574-4d8c"}, {"nodeId": "1088", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", responsible in part for the smells of rancid butter and human sweat.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", responsible in part for the smells of rancid butter and human sweat."}}]}, "properties": [], "parentId": "587", "childIds": [], "backendDOMNodeId": 838}, {"nodeId": "1089", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "When a carboxylic acid reacts with an alcohol, it forms an ester. An ester has a structure similar to that described for a carboxylic acid, with a few key differences. In addition to its bonds (one double, one single) with the oxygen atoms, the carbon atom is also attached to a hydrocarbon, which comes from the carboxylic acid. Furthermore, the single-bonded oxygen atom is attached not to a hydrogen, but to a second hydrocarbon, this one from the alcohol. One well-known ester is acetylsalicylic acid", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "When a carboxylic acid reacts with an alcohol, it forms an ester. An ester has a structure similar to that described for a carboxylic acid, with a few key differences. In addition to its bonds (one double, one single) with the oxygen atoms, the carbon atom is also attached to a hydrocarbon, which comes from the carboxylic acid. Furthermore, the single-bonded oxygen atom is attached not to a hydrogen, but to a second hydrocarbon, this one from the alcohol. One well-known ester is acetylsalicylic acid"}}]}, "properties": [], "parentId": "588", "childIds": [], "backendDOMNodeId": 840}, {"nodeId": "1090", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "588", "childIds": ["1761"], "backendDOMNodeId": 841, "browsergym_id": "d3c3f557-9bd7-4f26"}, {"nodeId": "1091", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "better known as aspirin. Esters, which are a key factor in the aroma of various types of fruit, are often noted for their pleasant smell.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "better known as aspirin. Esters, which are a key factor in the aroma of various types of fruit, are often noted for their pleasant smell."}}]}, "properties": [], "parentId": "588", "childIds": [], "backendDOMNodeId": 843}, {"nodeId": "1092", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Polymers", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Polymers"}}]}, "properties": [], "parentId": "590", "childIds": [], "backendDOMNodeId": 846}, {"nodeId": "1093", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Polymers are long, stringy molecules made of smaller molecules called monomers. They appear in nature, but thanks to Carothers", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Polymers are long, stringy molecules made of smaller molecules called monomers. They appear in nature, but thanks to Carothers"}}]}, "properties": [], "parentId": "591", "childIds": [], "backendDOMNodeId": 848}, {"nodeId": "1094", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "591", "childIds": ["1762"], "backendDOMNodeId": 849, "browsergym_id": "7be33588-cc9b-4cb3"}, {"nodeId": "1095", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "a tragic figure, who committed suicide a year before Nylon made its public debut", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "a tragic figure, who committed suicide a year before Nylon made its public debut"}}]}, "properties": [], "parentId": "591", "childIds": [], "backendDOMNodeId": 851}, {"nodeId": "1096", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "591", "childIds": ["1763"], "backendDOMNodeId": 852, "browsergym_id": "eba77d70-8d8f-44f0"}, {"nodeId": "1097", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "as well as other scientists and inventors, synthetic polymers are a fundamental part of daily life.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "as well as other scientists and inventors, synthetic polymers are a fundamental part of daily life."}}]}, "properties": [], "parentId": "591", "childIds": [], "backendDOMNodeId": 854}, {"nodeId": "1098", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "The structure of even the simplest polymer, polyethylene, is far too complicated to discuss in ordinary language, but must be represented by chemical symbolism. Indeed, polymers are a subject unto themselves, but it is worth noting here just how many products used today involve polymers in some form or another.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "The structure of even the simplest polymer, polyethylene, is far too complicated to discuss in ordinary language, but must be represented by chemical symbolism. Indeed, polymers are a subject unto themselves, but it is worth noting here just how many products used today involve polymers in some form or another."}}]}, "properties": [], "parentId": "592", "childIds": [], "backendDOMNodeId": 856}, {"nodeId": "1099", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Polyethylene, for instance, is the plastic used in garbage bags, electrical insulation, bottles, and a host of other applications. A variation on polyethylene is Teflon, used not only in nonstick cookware, but also in a number of other devices, such as bearings for low-temperature use. Polymers of various kinds are found in siding for houses, tire tread, toys, carpets and fabrics, and a variety of other products far too lengthy to enumerate.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Polyethylene, for instance, is the plastic used in garbage bags, electrical insulation, bottles, and a host of other applications. A variation on polyethylene is Teflon, used not only in nonstick cookware, but also in a number of other devices, such as bearings for low-temperature use. 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Many hundreds of new compounds are added every day. Much more than half of the world's chemists are organic chemists. Some new organic compounds are simply isolated from plants or animals; some are made by modifying naturally occurring chemicals; but most new organic compounds are actually synthesized in the laboratory from other (usually smaller) organic molecules. Over the years organic chemists have developed a broad array of reactions that allow them to make all kinds of complex products from simpler starting materials.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " includes more than twenty million compounds for which properties have been determined and recorded in the literature. Many hundreds of new compounds are added every day. Much more than half of the world's chemists are organic chemists. 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"}}]}, "properties": [], "parentId": "692", "childIds": [], "backendDOMNodeId": 2169}, {"nodeId": "1319", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "Coal", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "Coal"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "692", "childIds": ["1878"], "backendDOMNodeId": 2170, "browsergym_id": "a8089a56-ef5c-4dc6"}, {"nodeId": "1320", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", the other fossil fuel, is a much more complicated material from which many kinds of organic compounds, some of them hydrocarbons, can be obtained.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", the other fossil fuel, is a much more complicated material from which many kinds of organic compounds, some of them hydrocarbons, can be obtained."}}]}, "properties": [], "parentId": "692", "childIds": [], "backendDOMNodeId": 2172}, {"nodeId": "1321", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Functional Groups", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Functional Groups"}}]}, "properties": [], "parentId": "693", "childIds": [], "backendDOMNodeId": 2174}, {"nodeId": "1322", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Alkane molecules are rather unreactive (except for being very flammable), but alkenes react with many other substances. 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If the methyl group of (2) were attached to a terminal carbon, the resultant molecule would be the same as (1). Methylpropane (2) is also called ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " -butane), whereas the branched molecule (2) is methylpropane (rather than 2-methylpropane, as the methyl group has to be in a 2-position). If the methyl group of (2) were attached to a terminal carbon, the resultant molecule would be the same as (1). 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Molecules that contain such conjugated systems are said to be stabilized by \"resonance.\" In the benzene ring every other bond is a double bond, all the way around the ring. This results in a special kind of stabilization called \"aromaticity,\" in which the electrons are delocalized and free to travel all around the ring. Certain ring compounds, like benzene, that contain such a conjugated system of double and single bonds are described as \"aromatic.\"", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "In a conjugated system, there are alternating double and single bonds, allowing electrons to flow back and forth. Molecules that contain such conjugated systems are said to be stabilized by \"resonance.\" In the benzene ring every other bond is a double bond, all the way around the ring. This results in a special kind of stabilization called \"aromaticity,\" in which the electrons are delocalized and free to travel all around the ring. 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Hexane has 5 isomers: hexane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, and 2,3-dimethylbutane. Heptane has 9 different isomers, octane has 18, nonane has 35, and decane has 75. An increase in the number of carbon atoms greatly increases the possibilities for isomerism. There are more than 4,000 isomers of C", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " pentane). Hexane has 5 isomers: hexane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, and 2,3-dimethylbutane. Heptane has 9 different isomers, octane has 18, nonane has 35, and decane has 75. An increase in the number of carbon atoms greatly increases the possibilities for isomerism. 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Of course, most of them have never been isolated as pure compounds (but could be, if there were any point in doing it).", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " has more than 4 billion. Of course, most of them have never been isolated as pure compounds (but could be, if there were any point in doing it)."}}]}, "properties": [], "parentId": "699", "childIds": [], "backendDOMNodeId": 2235}, {"nodeId": "1360", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "For molecules other than hydrocarbons, still other kinds of isomers are possible. The simple formula C", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "For molecules other than hydrocarbons, still other kinds of isomers are possible. The simple formula C"}}]}, "properties": [], "parentId": "700", "childIds": [], "backendDOMNodeId": 2237}, {"nodeId": "1361", "ignored": false, "role": {"type": "role", "value": "subscript"}, "chromeRole": {"type": "internalRole", "value": 185}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "700", "childIds": ["1895"], "backendDOMNodeId": 2238, "browsergym_id": "c59fc6ec-5100-44d0"}, {"nodeId": "1362", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "H", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "H"}}]}, "properties": [], "parentId": "700", "childIds": [], "backendDOMNodeId": 2240}, {"nodeId": "1363", "ignored": false, "role": {"type": "role", "value": "subscript"}, "chromeRole": {"type": "internalRole", "value": 185}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "700", "childIds": ["1896"], "backendDOMNodeId": 2241, "browsergym_id": "f34f7c24-be95-44c3"}, {"nodeId": "1364", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "O can represent ethyl alcohol or dimethyl ether; 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The larger a molecule is, and the greater the variety of atoms and functional groups it contains, the more numerous its isomers.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " (among other things). The larger a molecule is, and the greater the variety of atoms and functional groups it contains, the more numerous its isomers."}}]}, "properties": [], "parentId": "700", "childIds": [], "backendDOMNodeId": 2255}, {"nodeId": "1373", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "There is still another kind of isomerism that stems from the existence of \"right-\" and \"left-handed\" molecules. It is sometimes referred to as ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "There is still another kind of isomerism that stems from the existence of \"right-\" and \"left-handed\" molecules. 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The group later became known as the International Union of Pure and Applied Chemistry (IUPAC). Its objective was to establish a naming process that would provide each compound with a unique and systematic name. An initial set of rules was adopted at that first meeting in Geneva, and IUPAC has continued that work. Its systematic naming rules are used by organic chemists all over the world. The names of the alkanes form the basis for the system, with functional groups usually being indicated with appropriate suffixes. Some examples are given in Table 2.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ". The group later became known as the International Union of Pure and Applied Chemistry (IUPAC). Its objective was to establish a naming process that would provide each compound with a unique and systematic name. An initial set of rules was adopted at that first meeting in Geneva, and IUPAC has continued that work. Its systematic naming rules are used by organic chemists all over the world. The names of the alkanes form the basis for the system, with functional groups usually being indicated with appropriate suffixes. Some examples are given in Table 2."}}]}, "properties": [], "parentId": "704", "childIds": [], "backendDOMNodeId": 2284}, {"nodeId": "1391", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Organic Reactions", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Organic Reactions"}}]}, "properties": [], "parentId": "705", "childIds": [], "backendDOMNodeId": 2286}, {"nodeId": "1392", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Organic chemistry is concerned with the many compounds of carbon, their names, their isomers, and their properties, but it is mostly concerned with their reactions. Organic chemists have developed a huge array of chemical reactions that can convert one organic compound to another. 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Of course, not all organic reactions are highly successful. One reaction might be a very simple one giving essentially 100 percent of the desired product; but another might be a complex multistep process yielding less than 5 percent overall of the wanted product.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "of solvent. Of course, not all organic reactions are highly successful. One reaction might be a very simple one giving essentially 100 percent of the desired product; but another might be a complex multistep process yielding less than 5 percent overall of the wanted product."}}]}, "properties": [], "parentId": "708", "childIds": [], "backendDOMNodeId": 2512}, {"nodeId": "1396", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Organic reactions can often give remarkable control as to what products should be formed. 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source for many organic chemicals for more than a century, but our fossil fuel resources are finite, and they are being rapidly depleted (especially oil and gas). 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The industries vary from oil and chemical companies to industries producing food, pharmaceuticals, cosmetics, detergents, paints, plastics, pesticides, textiles, or other kinds of products. Many organic chemists work in laboratories, where they do various kinds of analysis or research, but many others do not. Some are teachers, or writers, or science librarians. Some study law and become patent attorneys; some study medicine and become medical researchers; and some study business and become administrators of companies, colleges, or other institutions. Organic chemistry is an enormous field full of many kinds of career possibilities.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Some organic chemists are involved in basic research at government or academic institutions, but most have careers in industry. 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The name organic goes back to a much earlier time in history when chemists thought that chemical compounds in living organisms were fundamentally different from those that occur in nonliving things. The belief was that the chemicals that could be extracted from or that were produced by living organisms had a special \"vitalism\" or \"breath of life\" given to them by some supernatural being. As such, they presented fundamentally different kinds of problems than did the chemicals found in rocks, minerals, water, air, and other nonliving entities. The chemical compounds associated with living organisms were given the name organic to emphasize their connection with life.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Organic chemistry is the study of compounds of carbon. The name organic goes back to a much earlier time in history when chemists thought that chemical compounds in living organisms were fundamentally different from those that occur in nonliving things. The belief was that the chemicals that could be extracted from or that were produced by living organisms had a special \"vitalism\" or \"breath of life\" given to them by some supernatural being. As such, they presented fundamentally different kinds of problems than did the chemicals found in rocks, minerals, water, air, and other nonliving entities. 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He found a very simple way to convert chemical compounds from living organisms into comparable compounds from nonliving entities.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "1882) proved that this theory of vitalism was untrue. He found a very simple way to convert chemical compounds from living organisms into comparable compounds from nonliving entities."}}]}, "properties": [], "parentId": "734", "childIds": [], "backendDOMNodeId": 2800}, {"nodeId": "1466", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "As a result of W", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "As a result of W"}}]}, "properties": [], "parentId": "735", "childIds": [], "backendDOMNodeId": 2802}, {"nodeId": "1467", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "735", "childIds": ["1954"], "backendDOMNodeId": 2803, "browsergym_id": "bbe0a57c-ae96-47c1"}, {"nodeId": "1468", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "hler's research, the definition of ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "hler's research, the definition of "}}]}, "properties": [], "parentId": "735", "childIds": [], "backendDOMNodeId": 2808}, {"nodeId": "1469", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "organic chemistry", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "organic chemistry"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "735", "childIds": ["1955"], "backendDOMNodeId": 2809, "browsergym_id": "9f33809d-f705-489b"}, {"nodeId": "1470", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " changed. The new definition was based on the observation that every compound discovered in living organisms had one property in common: they all contained the element carbon. As a result, the modern definition of ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " changed. The new definition was based on the observation that every compound discovered in living organisms had one property in common: they all contained the element carbon. 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These include the following:"}}]}, "properties": [], "parentId": "737", "childIds": [], "backendDOMNodeId": 2837}, {"nodeId": "1481", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Major Organic Families and the Functional Groups They Contain", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Major Organic Families and the Functional Groups They Contain"}}]}, "properties": [], "parentId": "738", "childIds": [], "backendDOMNodeId": 2839}, {"nodeId": "1482", "ignored": false, "role": {"type": "role", "value": "rowgroup"}, "chromeRole": {"type": "internalRole", "value": 146}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "739", "childIds": ["1961"], "backendDOMNodeId": 2841, "browsergym_id": "a0d213bd-e64f-4b2c"}, {"nodeId": "1483", "ignored": false, "role": {"type": "role", "value": "rowgroup"}, "chromeRole": {"type": "internalRole", "value": 146}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "739", "childIds": ["1962", "1963", "1964", "1965", "1966", "1967", "1968", "1969", "1970"], "backendDOMNodeId": 2849, "browsergym_id": "b4555294-f6e1-40ed"}, {"nodeId": "1484", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "1. The number of organic compounds vastly exceeds the number of inorganic compounds. The ratio of carbon-based compounds to non-carbon-based compounds is at least ten to one, with close to 10 million organic compounds known today. The reason for this dramatic difference is a special property of the carbon atom: its ability to join with other carbon atoms in very long chains, in rings, and in other kinds of geometric arrangements. It is not at all unusual for dozens, hundreds, or thousands of carbon atoms to bond to each other within a single compound", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "1. The number of organic compounds vastly exceeds the number of inorganic compounds. The ratio of carbon-based compounds to non-carbon-based compounds is at least ten to one, with close to 10 million organic compounds known today. The reason for this dramatic difference is a special property of the carbon atom: its ability to join with other carbon atoms in very long chains, in rings, and in other kinds of geometric arrangements. It is not at all unusual for dozens, hundreds, or thousands of carbon atoms to bond to each other within a single compound"}}]}, "properties": [], "parentId": "740", "childIds": [], "backendDOMNodeId": 2909}, {"nodeId": "1485", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "740", "childIds": ["1971"], "backendDOMNodeId": 2910, "browsergym_id": "9ce32fd4-ace3-4b85"}, {"nodeId": "1486", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "a property that no other element exhibits.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "a property that no other element exhibits."}}]}, "properties": [], "parentId": "740", "childIds": [], "backendDOMNodeId": 2915}, {"nodeId": "1487", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "2. In general, organic compounds tend to have much lower melting and boiling points than do inorganic compounds.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "2. In general, organic compounds tend to have much lower melting and boiling points than do inorganic compounds."}}]}, "properties": [], "parentId": "741", "childIds": [], "backendDOMNodeId": 2917}, {"nodeId": "1488", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "3. In general, organic compounds are less likely to dissolve in water than are inorganic compounds.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "3. In general, organic compounds are less likely to dissolve in water than are inorganic compounds."}}]}, "properties": [], "parentId": "742", "childIds": [], "backendDOMNodeId": 2919}, {"nodeId": "1489", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "4. Organic compounds are likely to be more flammable but poorer conductors of heat and electricity than are inorganic compounds.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "4. Organic compounds are likely to be more flammable but poorer conductors of heat and electricity than are inorganic compounds."}}]}, "properties": [], "parentId": "743", "childIds": [], "backendDOMNodeId": 2921}, {"nodeId": "1490", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "5. Organic reactions tend to take place more slowly and to produce a much more complex set of products than do inorganic reactions.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "5. Organic reactions tend to take place more slowly and to produce a much more complex set of products than do inorganic reactions."}}]}, "properties": [], "parentId": "744", "childIds": [], "backendDOMNodeId": 2923}, {"nodeId": "1491", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Functional groups and organic families", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Functional groups and organic families"}}]}, "properties": [], "parentId": "745", "childIds": [], "backendDOMNodeId": 2925}, {"nodeId": "1492", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "The huge number of organic compounds requires that some system be developed for organizing them. The criterion on which those compounds are organized is the presence of various functional groups. A functional group is an arrangement of atoms that is responsible for certain characteristic physical and chemical properties in a compound. For example, one such functional group is the ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "The huge number of organic compounds requires that some system be developed for organizing them. The criterion on which those compounds are organized is the presence of various functional groups. A functional group is an arrangement of atoms that is responsible for certain characteristic physical and chemical properties in a compound. For example, one such functional group is the "}}]}, "properties": [], "parentId": "746", "childIds": [], "backendDOMNodeId": 2927}, {"nodeId": "1493", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "hydroxyl group", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "hydroxyl group"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "746", "childIds": ["1972"], "backendDOMNodeId": 2928, "browsergym_id": "98554927-6781-4df3"}, {"nodeId": "1494", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", consisting of an oxygen atom and hydrogen atom joined to each other. It is represented by the formula ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", consisting of an oxygen atom and hydrogen atom joined to each other. It is represented by the formula "}}]}, "properties": [], "parentId": "746", "childIds": [], "backendDOMNodeId": 2930}, {"nodeId": "1495", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "746", "childIds": ["1973"], "backendDOMNodeId": 2931, "browsergym_id": "e2ec59b0-061e-4864"}, {"nodeId": "1496", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "OH.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "OH."}}]}, "properties": [], "parentId": "746", "childIds": [], "backendDOMNodeId": 2936}, {"nodeId": "1497", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "All organic compounds with the same functional group are said to belong to the same organic family. Any organic compound that contains a hydroxyl group, for instance, is called an alcohol. All alcohols are similar to each other in that: (1) they contain one or more hydroxyl groups, and (2) because of those groups, they have similar physical and chemical properties. For example, alcohols tend to be more soluble in water than other organic compounds because the hydroxyl groups in the alcohol form bonds with water molecules.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "All organic compounds with the same functional group are said to belong to the same organic family. Any organic compound that contains a hydroxyl group, for instance, is called an alcohol. All alcohols are similar to each other in that: (1) they contain one or more hydroxyl groups, and (2) because of those groups, they have similar physical and chemical properties. For example, alcohols tend to be more soluble in water than other organic compounds because the hydroxyl groups in the alcohol form bonds with water molecules."}}]}, "properties": [], "parentId": "747", "childIds": [], "backendDOMNodeId": 2938}, {"nodeId": "1498", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "The simplest organic compounds are the hydrocarbons, compounds that contain only two elements: carbon and hydrogen. The class of hydrocarbons can be divided into subgroups depending on the way in which carbon and hydrogen atoms are joined to each other. In some hydrocarbons, for example, carbon and hydrogen atoms are joined to each other only by single bonds. 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\ No newline at end of file