AQA Jun 2017 Paper 2 Q9

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160 9 Chloroethene can be polymerised to form poly(chloroethene), commonly known as PVC. This polymer can be used to make pipes, window frames and electrical insulation. Plasticisers can be added to change the properties of PVC A section of poly(chloroethene) is shown. [2 marks] 0 9 . 1 Chloroethene has a melting point of 154 C All types of PVC melt at temperatures over 100 C Explain why PVC melts at a higher temperature than chloroethene. 0 9 . 2 This structure shows a molecule that has been used as a plasticiser in PVC. Deduce the number of hydrogen atoms in this molecule. [1 mark] *16* IB/M/Jun17/7404/2<br /> 17Use your understanding of the properties of PVC to explain whether you would expect to find a plasticiser in the PVC used to insulate electrical cables. [1 mark] A section of the polymer poly(chloroprene), a synthetic rubber, is shown. Draw the displayed formula for the repeating unit of poly(chloroprene). [1 mark] Turn over for the next question 0 9 . 3 0 9 . 4 *17* Turn overIB/M/Jun17/7404/2<br />

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