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Crude oil:

It is a dark smelly liquid which is a mixture of different substances.
Crude oil straight out of the ground is not much use because there are too many different
substances in it, all with different boiling points.

Hydrocarbons:
Most the compounds in crude oil are made from…

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Cleaner fuels:
Catalytic converters are put in cars to reduce the amount of pollution given off by cars.
They work by passing the exhaust gases over transition metals. These are arranged in a way so
they have a very large surface area and this cause the nitrogen oxides and carbon…

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