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24:[["$","$L33",null,{"feature":"flashcards"}],"$L34",["$","$L35",null,{"href":"/gcse/chemistry/edexcel/hydrocarbons/flashcards","label":"10.2 Hydrocarbons","subjectCode":"gcse_chemistry","surface":"flashcards"}],["$","$L36",null,{"runner":["$","div",null,{"className":"min-h-0 flex-1 overflow-hidden bg-background","children":["$","$L37",null,{"decks":[{"id":"8cf17662-e669-4ce2-90ad-1c30614ee7ea","title":"10.2 Hydrocarbons Flashcards","topicId":"94c8ff3f-e55e-5b74-b4bb-103cd924803e","topicSlug":"hydrocarbons","cards":[{"id":"4ced1cc2-0045-4ffb-9714-3d050da96901","cardType":"basic","points":1,"front":"What is the general formula of an alkane?","back":"$$\\text{C}_n\\text{H}_{2n+2}$","mcqOptions":null},{"id":"7439d877-e7ed-4b9f-80eb-37eca58afce5","cardType":"basic","points":1,"front":"What is the molecular formula of methane?","back":"$$\\text{CH}_4$","mcqOptions":null},{"id":"46a6278b-6b52-4eed-9c98-1aac7f8679bd","cardType":"basic","points":1,"front":"What is the molecular formula of ethane?","back":"$$\\text{C}_2\\text{H}_6$","mcqOptions":null},{"id":"6cf296ab-54af-42d2-a376-16841f2bc1f7","cardType":"basic","points":1,"front":"How many bonds does each carbon atom form?","back":"Each carbon forms four bonds.","mcqOptions":null},{"id":"4d33c880-171c-4163-96bf-3d3a2366a629","cardType":"basic","points":2,"front":"Why are alkanes described as saturated?","back":"Their carbon atoms are joined only by single bonds, so they hold as many hydrogen atoms as possible.","mcqOptions":null},{"id":"0dcecd5e-d466-419a-a1c1-6a3bc9ab5a57","cardType":"basic","points":1,"front":"What is the general formula of an alkene?","back":"$$\\text{C}_n\\text{H}_{2n}$","mcqOptions":null},{"id":"65dd5512-931b-4815-9937-eb00aa2aac43","cardType":"basic","points":1,"front":"What is the molecular formula of ethene?","back":"$$\\text{C}_2\\text{H}_4$","mcqOptions":null},{"id":"5029ddf8-ff1a-49fb-8890-1e40a51542d5","cardType":"basic","points":1,"front":"What is the functional group in an alkene?","back":"A carbon to carbon double bond, written $\\text{C}=\\text{C}$.","mcqOptions":null},{"id":"8c63fedd-ea17-466a-8b10-f088ad506ef2","cardType":"basic","points":2,"front":"Why do alkenes have characteristic reactions?","back":"Every alkene contains the same carbon-carbon double bond functional group.","mcqOptions":null},{"id":"556b6637-68e6-42de-9cd1-f342fafbcfe9","cardType":"basic","points":2,"front":"How do but-1-ene and but-2-ene differ?","back":"The position of the double bond differs: between carbons 1-2 or 2-3.","mcqOptions":null},{"id":"91c155aa-2e2b-4fa7-9b45-8567b4ea13fd","cardType":"basic","points":2,"front":"What happens to the double bond during an addition reaction?","back":"The double bond opens, allowing atoms to bond to the two carbon atoms.","mcqOptions":null},{"id":"d08d6a83-a043-4294-a147-ae124815cbdb","cardType":"basic","points":1,"front":"What is the product when ethene reacts with bromine?","back":"1,2-dibromoethane is formed.","mcqOptions":null},{"id":"f4ccae2b-3ad2-4aa1-858f-6264be1db1d9","cardType":"basic","points":2,"front":"Write the equation for ethene reacting with bromine.","back":"$$$\\text{C}_2\\text{H}_4 + \\text{Br}_2 \\rightarrow \\text{C}_2\\text{H}_4\\text{Br}_2$$","mcqOptions":null},{"id":"93080e37-c9fb-4072-956a-aed16f4efb1e","cardType":"basic","points":2,"front":"Why does bromine water turn colourless when shaken with an alkene?","back":"The bromine is used up in an addition reaction across the double bond.","mcqOptions":null},{"id":"e874ce83-d9ff-476b-b636-765602c164d5","cardType":"basic","points":1,"front":"What happens to bromine water when shaken with an alkane?","back":"It stays orange because there is no double bond to react with.","mcqOptions":null},{"id":"d660f979-0162-4680-854a-268275c60e82","cardType":"basic","points":1,"front":"What are the products of complete combustion of any hydrocarbon?","back":"

Carbon dioxide
Water

","mcqOptions":null},{"id":"8e05bad1-ab6f-4d11-aa97-04f270f3fbd2","cardType":"basic","points":1,"front":"Why is complete combustion exothermic?","back":"Energy is given out during the reaction.","mcqOptions":null},{"id":"e3950d55-aaf8-4779-a4a2-5d34bb84f2f6","cardType":"basic","points":2,"front":"Write the balanced equation for complete combustion of methane.","back":"$$$\\text{CH}_4 + 2\\text{O}_2 \\rightarrow \\text{CO}_2 + 2\\text{H}_2\\text{O}$$","mcqOptions":null},{"id":"3edd8242-d8fe-4c7e-a15b-177ff9daeaed","cardType":"basic","points":2,"front":"Why does an alkene often burn with a smokier flame than a similar alkane?","back":"It has proportionally more carbon, so incomplete combustion releases unburnt carbon as soot.","mcqOptions":null},{"id":"0ec21c02-89a5-409b-ad3d-9abc74ace5e0","cardType":"cloze","points":null,"front":"Propane has molecular formula $\\text{[...]}$.","back":"Propane has molecular formula $\\boxed{\\text{C}_3\\text{H}_8}$.","mcqOptions":null},{"id":"3fa2d5a9-d7ad-4388-b9d7-de2110d579b7","cardType":"cloze","points":null,"front":"Butane has molecular formula $\\text{C}_4\\text{H}_{\\text{[...]}}$.","back":"Butane has molecular formula $\\text{C}_4\\text{H}_{\\boxed{10}}$.","mcqOptions":null},{"id":"aa5190a4-2b58-490d-8f51-5a2eb112d8f0","cardType":"cloze","points":null,"front":"An alkene has [ ] than the alkane with the same number of carbon atoms.","back":"An alkene has two fewer hydrogens than the alkane with the same number of carbon atoms.","mcqOptions":null},{"id":"a8c2e9e0-6129-462e-9580-3e8faa6f76f0","cardType":"cloze","points":null,"front":"In the addition of bromine to propene, the product is [ ].","back":"In the addition of bromine to propene, the product is 1,2-dibromopropane.","mcqOptions":null},{"id":"60bb84ab-9b3f-446f-b2fa-428300e49f7a","cardType":"cloze","points":null,"front":"Complete combustion occurs when a hydrocarbon burns in a [ ].","back":"Complete combustion occurs when a hydrocarbon burns in a plentiful supply of oxygen.","mcqOptions":null},{"id":"3762f545-3cba-4144-a6c8-56f700c916a4","cardType":"cloze","points":null,"front":"A clean [ ] flame indicates that the oxygen supply is plentiful.","back":"A clean blue flame indicates that the oxygen supply is plentiful.","mcqOptions":null}]}],"examCountdown":{"examDate":"2027-05-17","paperLabel":"Paper 1"},"heading":"10.2 Hydrocarbons","title":"10.2 Hydrocarbons Flashcards","topbar":{"backHref":"/gcse/chemistry/edexcel/flashcards"},"topicSidebar":"$L38"}]}],"topicId":"94c8ff3f-e55e-5b74-b4bb-103cd924803e","walled":"$L39"}],"$L3a","$L3b"]