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Alkenes - Coggle Diagram
Alkenes
Basic information:
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They form a homologous series with the general formula, CnH2n.
They contain C=C double bond, which is also their functional group.
Because they contain C=C double bonds, they are called unsaturated, because it is possible to break one of the two bonds to add extra atoms to the molecule.
Cracking:
Catalytic cracking:
This is a process where an alkene is made, by breaking down a larger alkane molecule.
In this process the alkane molecules to be ‘cracked’ (split up) are passed over a mixture of aluminium and chromium oxides heated to about 500°C.
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Hydrogenation:
The conditions necessary for this reaction to take place are a temperature of 200 °C in the presence of a nickel or platinum catalyst.
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Hydration:
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The reactants have to be passed over a catalyst of phosphoric(v) acid, at a temperature
of 300 °C and pressure of 60 atmospheres.
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