Biodegradable - breaks down in nature, Synthetic - man made by chemical process, Thermoplastic - can be reshaped by heating, Thermosetting - cannot be reshaped, Addition polymerisation - small unsaturated molecules join together, Monomer - unsaturated molecule which can made a polymer, Polymer - long chain molecule made from smaller molecules, polyethene - the most common polymer, petrochemical - substance from refining crude oil,

8a Plastics

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