4.7.2.1

4.7.2.1 Structure and formulae of alkenes

Content

  • Alkenes are hydrocarbons with a double carbon-carbon bond. The general formula for the homologous series of alkenes is CnH2n

Alkene molecules are unsaturated because they contain two fewer hydrogen atoms than the alkane with the same number of carbon atoms.

The first four members of the homologous series of alkenes are ethene, propene, butene and pentene.

Alkene molecules can be represented in the following forms:

C3H6or


Students do not need to know the names of individual alkenes other than ethene, propene, butene and pentene.

WS 1.2 Use a variety of models such as representational, spatial, descriptive, computational and mathematical to solve problems, make predictions and to develop scientific explanations and understanding of familiar and unfamiliar facts.

MS 5b -Visualise and represent 2D and 3D forms including two dimensional representations of 3D objects