Hydrocarbons: Fuel & Feedstock (AQA GCSE Chemistry Combined Science): Flashcards

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Crude Oil, Hydrocarbons & Alkanes
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What hydrocarbons are

Compounds containing only hydrogen and carbon atoms

Homologous series definition

Family of hydrocarbons with similar properties & same general formula

Effect of more C atoms on boiling point

Boiling point increases

What crude oil is

Mixture of different hydrocarbons

How long crude oil took to form

Millions of years

What crude oil formed from

Remains of dead plants and animals

Conditions for crude oil formation

High heat and pressure

Type of resource crude oil is

Finite (limited)

What alkanes are

Homologous series of saturated hydrocarbons

What 'saturated' means for alkanes

Maximum H atoms, only single bonds between C atoms

General formula for alkanes

CnH2n+2C_nH_{2n+2}

What 'n' represents in alkane formula

Number of carbon atoms

Three reactions alkanes undergo

Combustion, react with halogens, cracking

Bond types in saturated hydrocarbons

Only single bonds

Alkane chain length vs boiling point

Longer chains have higher boiling points

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