chemistry alkenes + polymers gcse

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Last updated 3:50 PM on 5/25/26
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7 Terms

1
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alkene properties

unsaturated

C=C double bond

2
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alkenes + halogens

addition reaction

double bond removed + 1 product

3
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alkane v alkene test

add bromine water

alkene turns colourless

alkane stays orange

4
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cracking

long chain alkanes broken into short chain alkenes

600-700 degrees

aluminium or silica catalyst

5
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why is cracking needed

too many longer hydrocarbons

increases supply of more useful hydrocarbons e.g. petrol

alkenes useful to make plastic

6
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what is addition polymerisation

monomers join together forming polymers

7
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why is it tricky to dispose of plastics

unreactive

non-biodegradable