Alkenes are a form of hydrocarbons with a general formula CnH2n
Alkenes are made up of carbon chains with one C=C double covalent bond and single covalent bonds
(C-C).
They are unsaturated as they have one spare bond.
Bromine water decolourises with alkenes as the alkenes forms bonds with the bromine ions.
Alkenes form polymers as they have a spare bond. The C=C double covalent bond opens up and links to adjacent alkenes this process is called polymerisation.
They don’t burn cleanly in air producing a smoky flame (soot) carbon, carbon dioxide and water.
You need to know the names of the first three Alkenes these are: ethene, propene and butene.
Ethene C2H4
Propene C3H6
Butene C4H8
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