The alkenes made by cracking are small molecules which can be used as monomers. The double bonds in alkenes are easily broken, so monomers can be joined together to make polymers (large, long-chain molecules.) molecules in plastic are called polymers.
When the alkenes join together to make a polymer, the reaction is called polymerisation. This process needs high pressure and a catalyst. you could use displayed formulae to show polymerisation reaction for example, ethene monomers making poly(ethene).
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