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Cracking and Polymers 1


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the breaking down of long-chained alkanes into a shorter-change alkane and an alkene
cracking
Cracking is an example of this processt. Thee breaking up of a chemical substance with heat into at least two chemical substances.
thermal decomposition
A long chain hydrocarbon is heated until is vaporises and is then passed over a hot catalyst (often auminium oxide).
Cracking (process)
The two hydrocarbons produced during cracking
Alkane and alkene
CnH2n
alkene general formula
Unsaturated hydrocarbon containing a carbon–carbon double bond.
Alkenes
C2H4
Ethene
C3H6
Propene
C4H8
Butene
A test for unstaturated substances. Bromine water turns from orange to colourless
Bromine water
A use of some of the products from cracking
Fuel
A very large molecule that is composed of many small, repeating structural units.
Polymer
the polymer made from the polymerisation of ethene
polyethene
the polymer made from the polymerisation of propene
polypropene
a useful polymer. It is waterproof and breathable making it an excellent material for outdoor clothing
Gore-tex
a significan problem with the use of polymers. Tbey are not broken down by microorganisms and so this leads to problems with waste disposal
Non-biodegradable