Longer chain hydrocarbons being broken down into shorter, more useful hydrocarbons
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What Re the two different types of cracking?
Steam and catalytic
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What happens during steam cracking?
The hydrocarbons are mixed with steam and they are heated to 850*C
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What happens during catalytic cracking?
The hydrocarbons are heated until they vapourise then the vapour is passed over a hot aluminium oxide catalyst and a thermal decomposition reaction takes place.
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What are the products of cracking?
Alkanes and alkenes
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Why must chemical equations always balance in regards to cracking?
As no atoms are made or destroyed during the cracking reaction
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Why are the alkanes produced special?
They are valuable as fuels
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Why is there a large demand for fuels with small chains of carbon atoms?
Because they are easy to ignite and have low boiling points
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What can the alkenes produced be used for?
A range of new compounds such as polymers and industrial alcohol
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Which is more reactive, an alkane or an alkene?
An alkenes
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What happens when alkenes react with bromine water?
When shaken with bromine water, they turn it from orange to colourless
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In the reaction “C2H4 + Br2 >>> CH4BrCH2Br”, what does ethene and bro,one produce?
Dibromoethane in an addition reaction
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What does ethane do to bro,onewater?
Nothing. It stays an orange brown solution. Ethene
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