1) What is added to an saturated hydrocarbon to make it more viscous? a) Oxygen b) Hydrogen c) Carbon d) Bromine 2) Which of these does not describe an alkene a) it is a monomer b) it has a double bond c) it is unsaturated d) bromine water remains orange when mixed with it 3) Which one describes a property of a thermoplastic? a) It has cross-links between polymer molecules b) it can be re-moulded when set c) it chars when heated d) it is rigid 4) What effect does a plasticiser have? a) allow polymer chains to slide over each other more easily b) adds cross links between polymer molecules c) saturates hydrocarbon molecules d) allows plastics to become biodegradable 5) A polyunstaurated oil is a) more viscous than a saturated oil b) less viscous than a saturated oil c) hydrogenated so it becomes runny d) full of single bonds

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