Alkenes (AQA GCSE Chemistry): Quizzes

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Alkenes
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What is the key structural feature that makes alkenes special?

A carbon-to-carbon double bond (C=C)

What is the general formula for all alkenes?

CnH2nC_nH_{2n}

What does it mean when alkenes are described as 'unsaturated'?

They lack maximum hydrogen atoms

What is the molecular formula of ethene?

C2H4C_2H_4

What is the molecular formula of propene?

C3H6C_3H_6

What is the molecular formula of butene?

C4H8C_4H_8

How are alkenes formed?

By cracking longer hydrocarbon chains

An alkene has 6 carbon atoms. How many hydrogen atoms does it have?

12

Which suffix in a hydrocarbon name indicates it is an alkene?

-ene

Why do alkenes have fewer hydrogen atoms than similar alkanes?

The double bond takes up space

How is a carbon-to-carbon double bond shown in a structural formula?

Two parallel lines (=)

Which feature helps identify a molecule as an alkene?

A C=C double bond in its structure

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