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AQA GCSE Chemistry Alkenes

Alkenes

This page covers the following topics:

1. Formulae and solubility of alkenes
2. First four alkenes
3. Molecular formula of alkenes
4. Nomenclature of alkenes

Alkenes are unsaturated hydrocarbons, meaning that there is a C=C bond present. They, like alkanes, are non polar molecules so are relatively insoluble in water.

Formulae and solubility of alkenes

The first 4 alkenes are slightly different to the first 4 alkanes as there MUST be a C=C bond.

First four alkenes

Molecular formula shows the number and type of atoms present in a molecule, remember that for alkenes they will follow the general formula from before.

Molecular formula of alkenes

Naming alkenes follows the same structure as naming alkanes, however you must also indicate where the C=C bond(s) are in the molecule.

Nomenclature of alkenes

1

What is the molecular formula of ethene?

What is the molecular formula of ethene?

2

Draw hex-2-ene.

Draw hex-2-ene.

3

What is the name of the 4th alkene?

What is the name of the 4th alkene?

4

How many structural isomers are there for butene? Draw structural formulas for these compounds.

How many structural isomers are there for butene? Draw structural formulas for these compounds.

5

Name the molecule shown

Name the molecule shown

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