There is concern about the disposal of plastics made from non-biodegradable polymers.

1. (a)(i)Name the type of polymer shown.[1]
2. (a)(ii)Draw the structure of the monomer used to make this polymer.[1]
3. (a)(iii)This polymer is often disposed of by combustion. Suggest one problem associated with this method of disposal.[1]
4. (b)(i)Suggest what is meant by the term biodegradable.[1]
5. (b)(ii)Draw the partial structure of poly(lactic acid). Show at least two repeat units.[2]
6. (b)(iii)A factory uses 500 tonnes of lactic acid to make poly(lactic acid). The percentage yield is 100% but the mass of poly(lactic acid) made is less than 500 tonnes. Explain why the mass of poly(lactic acid) made is less than 500 tonnes.[1]
7. (b)(iv)Aqueous lactic acid reacts with acidified potassium manganate(VII). There is a colour change from purple to colourless. Suggest what happens to the lactic acid in this reaction.[1]
8. (b)(v)Aqueous lactic acid is neutralised by aqueous sodium hydroxide. Write the ionic equation for this neutralisation.[1]
9. (b)(vi)Aqueous lactic acid reacts with magnesium. Name the gas made in this reaction.[1]

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