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Hydrocarbons are made from Carbon atoms and Hydrogen atoms only and there are two families of hydrocarbons - Alkanes and Alkenes.
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The prefix for the alkane/alkene depends on how many Carbon atoms are involved in the molecule.
If there is 1 Carbon atom, the prefix would be meth- , such as methane. Of course this is not possible with alkenes as an alkene must have a double bond between two Carbon atoms and Meth-[ene] would only have 1 Carbon atoms and so it cannot exist.
​2 Carbon atoms  -  eth-
​3 Carbon atoms  -  prop-
​4 Carbon atoms  -  but-
​5 Carbon atoms  -  pent-
​6 Carbon atoms  -  hex-
​7 Carbon atoms  -  hep-
​8 Carbon atoms  -  oct-
​9 Carbon atoms  -  non-
10 Carbon atoms  -  dec-

Polymerisation:
It is possible to make a polymer out of an alkene through 'addition polymerisation'.
Through this process, the double bond is broken and 2 half bonds are left open to attatch themselves to another monomer which has also got 2 half bonds open.

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Photo used under Creative Commons from goodrob13
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