AQA · Chemistry · 8462
GCSE Chemistry: Structure and formulae of alkenes
Organic chemistry · AQA GCSE Chemistry (8462), specification point 4.7.2.1. Cards are generated from the exam board's own specification for "Structure and formulae of alkenes", and every card links back to the page it came from. Separate science only. Specification © AQA — used with attribution.
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What type of bond do alkenes contain that alkanes do not?
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A carbon-carbon double bond (C=C).
What is the general formula for the homologous series of alkenes?
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CnH2n.
Alkenes are described as ? because they contain a carbon-carbon double bond.
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unsaturated
Why are alkene molecules described as unsaturated?
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They contain two fewer hydrogen atoms than the alkane with the same number of carbon atoms, because of the C=C double bond.
How many fewer hydrogen atoms does an alkene have than the alkane with the same number of carbons?
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Two fewer.
Name the first member of the alkene homologous series.
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Ethene (C2H4).
What is the molecular formula of propene?
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C3H6.
Name the alkene with four carbon atoms.
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Butene (C4H8).
What is the molecular formula of pentene?
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C5H10.
Alkenes are hydrocarbons. What does 'hydrocarbon' mean?
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A compound made of hydrogen and carbon atoms only.
Is C6H12 an alkane or an alkene?
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An alkene — it fits the general formula CnH2n (n = 6).
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