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These are revision notes on AQA Chemestry1, topic 5, Products from
Oil.

Cracking!
Cracking means s p l i t t i n g u p long chain hydrocarbons

To do this we use a high temperature and a catalyst.

Why is cracking useful?
Cracking produces fuels such
as petrol…

Page 2

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An example of this is kerosene C10H22 there are LOTS of this
in crude oil and not enough of the shorter molecules we want.
So we crack it into Octane C8H18 (petrol) and Ethene C2H4
(used to make polymers).

The Alkene Test
Alkenes are hydrocarbons with one C=C bond. They…

Page 3

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Positives: It a renewable source of energy, it's cheaper to
make and it can be used as a fuel.

Negatives: It's not very concentrated so it has to be distilled
and filtered.

Polymers
Alkenes are used to make polymers. We make polymers by
joining lots of little alkene molecules (monomers)…

Page 4

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In the same way if you join up lots of propene molecules you get
Polypropene (just put a `Poly' in front!)

Properties of polymers
Different polymers have different properties based on the
length of the hydrocarbon it was made from.

The physical properties of polymers are affected by the
temperature…

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