Cracking is a proces when it breaks down oils to form smaller hydrocarbons including alkanes and alkenes Ethene and other alkenes are unsaturated hydrocarbons and can be used to make polymers. Fuels made from oil mixtures containing large hydrocarbon molecules are not verry good because they do not flow easily and are hard to set alight. Cracking makes large hydrocarbon molecules to break down into smaller and more useful hydrocarbon molecules. Fractions containing large hydrocarbon molecules are heated to vaporise them. They are then either:
- passed over a hot catalyst, or
- mixed with steam and heated to a very high temperature.
- Hydrocarbons are a group of compounds wich…