{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.alkene","code":"thing-q81406","url":"https://ver.cy/models/thing/q81406/","name":"alkene","alternateNames":["dicyclobutylidene","cis-2-butene","trans-2-butene","Tetradec-4-ene","2-pentene","1-undecene","dodecene","1-hexene","1-eicosene","heptadecene","1-hexadecene","(7E)-7-tetradecene"],"kind":"thing","status":"published","version":"0.2.0-wave.2","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.MAT"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"An unsaturated hydrocarbon containing exactly one carbon-carbon double bond, such as ethene, propene, the butenes and longer chain alkenes, with cis and trans isomers where substitution allows, characterised by addition reactions across the double bond; alkenes are produced by cracking petroleum and are the feedstock for polymers, plastics and many chemicals.","purpose":"Let an agent explain alkenes and their chemistry, name and identify alkene isomers, describe reactions and industrial uses, and give safety guidance.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Double bond","Geometric isomerism","Addition chemistry","Polymer feedstock"],"structure":{"bundles":[{"id":"chemistry","name":"Chemistry","description":"Structure and isomerism.","layers":[{"id":"structure","name":"Structure","description":"The double bond.","findings":[{"id":"structure-finding","name":"Structure","description":"Structure.","questions":[{"text":"What defines an alkene, and how do its properties follow from the double bond?","kind":"definition"},{"text":"What are cis and trans isomers, and how are they named?","kind":"definition"}]}]},{"id":"name","name":"Name","description":"Naming alkenes.","findings":[{"id":"name-finding","name":"Name","description":"Naming.","questions":[{"text":"What is the IUPAC name of this alkene, and what is its structure?","kind":"action"},{"text":"Is this molecule an alkene?","kind":"definition"}]}]}]},{"id":"reactions","name":"Reactions","description":"Alkene reactions.","layers":[{"id":"addition","name":"Addition","description":"Addition reactions.","findings":[{"id":"addition-finding","name":"Addition","description":"Addition.","questions":[{"text":"How do alkenes undergo addition of hydrogen, halogens, water and acids, and what rule governs regiochemistry?","kind":"definition"},{"text":"How are alkenes tested for in the laboratory?","kind":"action"}]}]},{"id":"polymer","name":"Polymer","description":"Polymerisation.","findings":[{"id":"polymer-finding","name":"Polymer","description":"Polymerisation.","questions":[{"text":"How do alkenes polymerise into plastics such as polyethylene and polypropylene?","kind":"definition"},{"text":"Which entry fits a specific polymer?","kind":"action"}]}]}]},{"id":"industry","name":"Industry","description":"Production and use.","layers":[{"id":"production","name":"Production","description":"Making alkenes.","findings":[{"id":"production-finding","name":"Production","description":"Production.","questions":[{"text":"How are alkenes produced by cracking and dehydrogenation, and how large is the industry?","kind":"provenance"},{"text":"Which alkenes are most important?","kind":"provenance"}]}]},{"id":"safety","name":"Safety","description":"Handling alkenes.","findings":[{"id":"safety-finding","name":"Safety","description":"Safety.","questions":[{"text":"How should alkene gases and liquids be handled and stored safely?","kind":"provenance"},{"text":"Is there a leak or exposure now?","kind":"boundary"}]}]}]},{"id":"learn","name":"Learn","description":"Teaching and nature.","layers":[{"id":"nature","name":"Nature","description":"Alkenes in nature.","findings":[{"id":"nature-finding","name":"Nature","description":"Nature.","questions":[{"text":"Which alkenes occur naturally, such as ethene as a plant hormone and terpenes?","kind":"provenance"},{"text":"What roles do they play?","kind":"provenance"}]}]},{"id":"teach","name":"Teach","description":"Teaching.","findings":[{"id":"teach-finding","name":"Teach","description":"Teaching.","questions":[{"text":"How can alkene chemistry be taught with models and experiments?","kind":"action"},{"text":"Which misconceptions arise?","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Report an alkene's structure, isomers and properties from reliable chemistry sources.","Point to the safety data sheet for an alkene before handling."],"mustNot":["Assist anyone in using alkenes to cause fires or explosions.","Confuse cis and trans isomers when reporting a compound.","Recommend storing or handling flammable alkene gases outside the safety data guidance.","Release alkenes to air or water outside a permit."],"requiresHuman":["Any physical handling of pressurised or bulk alkene gases."]},"ethics":{"considerations":["Flammable gases put workers and neighbours of plants at risk of fire and explosion.","Petrochemical production affects air quality in nearby communities."],"affectedParties":["Chemical workers","Communities near plants","Students"]},"owners":{"steward":"Nobody owns the class; each plant operator answers for the alkenes it holds.","roles":[],"masterSystems":["Chemical substance inventories"]},"relations":[{"target":"Q11797724","type":"parent","note":"registry parent class"},{"target":"Q344942","type":"parent","note":"registry parent class"},{"target":"Q47165582","type":"parent","note":"registry parent class"},{"target":"aliphatic hydrocarbon","type":"related","note":"category"},{"target":"olefin","type":"related","note":"category"},{"target":"nitrile","type":"related","note":"another functional group class"},{"target":"refining","type":"related","note":"produced by cracking"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.alkene","Wikidata: Q81406 (https://www.wikidata.org/wiki/Q81406)"]},"properties":{"applicability":"required","items":["Boiling temperature:  K - Boiling temperature is measured at a stated pressure for the identified alkene and depends on molecular structure.","Melting temperature:  K - Melting temperature is measured by thermal analysis for a specified alkene, isomer composition and purity.","Mass density:  kg/m3 - Density is measured as mass per unit volume at a stated temperature, pressure and physical phase."]},"recognition":{"applicability":"required","items":["Carbon-carbon double bond","Addition reactions","Alkanes are saturated; alkynes have triple bonds","Gases or volatile liquids for small alkenes; waxy solids for long chains."]},"capabilities":{"applicability":"required","items":["explain alkene structure and isomerism","name and identify alkenes","describe reactions and uses","give safety guidance"]},"hazards":{"applicability":"required","items":["Flammability and explosion","Confusing cis and trans isomers","Pressurised gas hazards"]},"interfaces":{"applicability":"required","items":["Chemical safety data sheet requirements","Flammable gas handling rules","IUPAC nomenclature"]},"context":{"applicability":"required","items":["Hydrocarbons with double bonds.","simple alkenes such as ethene and propene","butenes and pentenes with cis and trans isomers","long-chain alkenes","dienes and polyenes","cycloalkenes"]}},"sources":[{"title":"Wikidata item Q81406: alkene","url":"https://www.wikidata.org/wiki/Q81406","note":"identity and sense of the item"},{"title":"Wikipedia: Alkene","url":"https://en.wikipedia.org/wiki/Alkene","note":"general description of the item"}],"openQuestions":["Should individual alkenes be separate entries?","How should safety data be linked?","How should reaction databases be linked?"],"resources":{"spec":"/models/things/publications/thing-q81406/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q81406/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T22:44:49Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T12:16:34+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}