Alkenes (AQA GCSE Chemistry Combined Science): Flashcards

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Alkenes
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Type of compound alkenes are

Hydrocarbons (only hydrogen and carbon atoms)

Key structural feature of alkenes

Carbon-to-carbon double bond (\ceC=C\ce{C=C})

How alkenes are made

By cracking long-chain alkanes

Meaning of 'unsaturated' for alkenes

Fewer H atoms than possible due to double bond

General formula of alkenes

\ceCnH2n\ce{C_nH_{2n}}

Formula of ethene

\ceC2H4\ce{C_2H_4}

Formula of propene

\ceC3H6\ce{C_3H_6}

Bromine water + alkene colour change

Orange to colourless

Bromine water + alkane colour change

Stays orange (no change)

Why alkenes are more reactive than alkanes

Because of their \ceC=C\ce{C=C} double bond

Why double bond makes alkenes reactive

It can break easily, allowing reactions

Three features to identify alkenes

Hydrocarbon, \ceC=C\ce{C=C} bond, fewer H than alkane

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