Combined ScienceCode 5129
Alkenes
What this topic asks you to be able to do
- State that alkenes are unsaturated hydrocarbons, with a carbon–carbon double covalent bond as part of their bonding
- Describe how alkenes and hydrogen are produced by cracking large alkane molecules, which requires a high temperature and a catalyst
- Describe the reasons why large alkane molecules undergo cracking
- Describe the test that uses aqueous bromine to distinguish saturated from unsaturated hydrocarbons, based on how they react with it
- State that during an addition reaction, only a single product is obtained
- Describe how ethene forms poly(ethene) by addition polymerisation, and identify the repeat unit
- State that poly(ethene) is a plastic that is used widely