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103027
CRACKING
Description
AQA C1.5
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gcse
Mind Map by
SJ_
, updated more than 1 year ago
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Created by
SJ_
over 11 years ago
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Resource summary
CRACKING
Smaller molecules are made from larger molecules
Saturated molecule changes to a smaller unsaturated molecule and a saturated molecule
Annotations:
Saturated - all single bonds
Heat is used to vapourise the molecule
Annotations:
Vapourise - change a liquid to a gas by heating
Vapours pass over a hot catalyst
Annotations:
Catalyst - a chemical which makes a reaction go faster
Can be used as a way of making FUELS and POLYMERS
Makes alkenes
Ethene is an alkene
Used to make
Ethanol
Fermentation is another way to make ethanol
Sugar--> Carbon dioxide + Ethanol
Sugar is RENEWABLE
Yeast is needed for this reaction
Ethene + Steam --> Ethanol
HYDRATION
Polymers e.g. poly(ethene)
New packaging materials
Waterproof coating for fabrics
Polymerisation
Small to large
Monomers change to polymers
Dental polymers
Shape memory polymers
Not biodegradable
Causes problems at landfill sites
Unsaturated molecules
Carbon to carbon double bond
C=C
Use bromine water as a test
Orange to colourless would be seen
CnH2n
THERMAL DECOMPOSITION
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