- Cracking turns long-chain hydrocarbons into short-chain hydrocarbons.
- The long-chain hydrocarbons are heated at a high temperature over a catalyst.
- The hydrocarbons then split into smaller molecules such as petrol.
Hydrocarbons from crude oil are called alkanes. When a large alkane is cracked it becomes a smaller alkane and an alkene.
An alkene has a double bond.
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