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Slide 1

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The Need for More Alkenes
The alkenes are very important in industry as they can be made
into polymers such as plastics. The demand for the polymers is so
high that more alkenes are produced from the alkanes by an
industrial process called cracking.
Ethene (C2H4) is commonly known as ethylene and is the first
member of the alkenes ­ it can be used to make polythene.
Propene (C3H6) can be used to make polypropene.
Ethene (C2H4) Propene (C3H6)…read more

Slide 2

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Cracking of Crude Oil
Cracking is a process used to increase the amounts of useful
products obtained from crude oil. Cracking breaks apart large
alkane molecules into smaller, more useful alkanes and alkenes.
The process of cracking involves passing a vaporised crude oil
fraction over a heated zeolite catalyst (aluminium silicate).
No single reaction takes place - a variety of different large alkane
molecules are broken down into smaller alkanes and alkenes.
decane octane ethene
This is a thermal decomposition reaction. The octane produced
can be used to produce petrol. The ethene produced can be used to
produce many other chemicals.…read more

Slide 3

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Cracking of Crude Oil
Point the cursor over each part of the plant to see how it works...
The alkenes produced by cracking are used as the raw material
for the production of polymers (e.g. plastics) and other chemicals.…read more

Slide 4

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Alkenes are a type of unsaturated hydrocarbon. This means that
at least one carbon atom does not have as many hydrogen atoms
attached as could be - there is a carbon-to-carbon double bond.
Alkenes have the general formula CnH2n and the following general
Ethene C2H4 Propene C3H6 Butene C4H8…read more

Slide 5

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Drag the names of these alkenes to match their structures.…read more


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