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Chemistry 1- Alkenes (Fractions produced by fractional distillation can go…
Chemistry 1- Alkenes
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Fuels made from oil mixtures containing large hydrocarbon molecules are not efficient: do not flow easily, easy to ignite
Crude oils often contain too many large hydrocarbon molecules and not enough small hydrocarbon molecules to meet demand
Cracking allows large hydrocarbon molecules to be broken down into smaller useful hydrocarbon molecules
Fractions containing large hydrocarbon molecules are heated to vaporise them: can be passed over hot catalyst, or mixed with steam and heated to a very high temperature
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Some smaller hydrocarbon formed by cracking are used as fuels, and the alkenes used to make polymers in plastics manufacture
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Ethene 
Propene
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Bromine water- dilute solution of bromine- normally orange- brown in colour- becomes colourless when shook with alkene, colour remains same with alkanes- test for unsaturation