chemistry unit 1- products from oil
- Created by: safia rassool
- Created on: 18-05-16 12:01
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- Large hydrocarbons can be broken down into smaller ones by the process of cracking
- two ways of cracking - 1)passing the vapour over a hot catalyst 2) heating hydrocrabon vapour to very high temp
- thermal decomposition takes place in cracking- this is useful to seperate smaller alkanes useful as fuels from the large hydrocarbons
- molecules which come from the hydrocarbons are ALKENES- CnH2n
- alkenes are unsaturated because they contain fewer hydrogen atoms, they have a DOUBLE CARBON BOND= more reactive
- alkenes turn bromine water from orange to colourless
- Plastics are made from long chains of polymers
- polymer= many monomers joined together to form a chain
- To make a polymer- POLYMERISATION
- in polymerisation the double carbon bond breaks…
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