13622.06R 10 Which one of the following is the formula of copper(II) arsenate(V)? A CuAsO4 B Cu2AsO4 C Cu(AsO4)2 D Cu3(AsO4)2 Answer               [1] 13622.06R BLANK PAGE DO NOT WRITE ON THIS PAGE (Questions continue overleaf) [Turn over 13622.06R Section B Answer all five questions in the spaces provided. 11 Small molecules which combine to form a polymer are called monomers. (a) The repeating unit of a polymer called nylon-6,6 is shown below. O H N H O N nylon-6,6 (i) State the IUPAC names of two monomers used to form this polymer. [2] (ii) State two different terms which may be used to describe the type of polymer shown. [2] (iii) Explain why the polymer is referred to as nylon-6,6. [1] (iv) A section of nylon-6,6 contains 240 of the repeating unit shown above. Calculate the relative formula mass of this section of polymer. Answer [1] 13622.06R [Turn over (v) Nylon is a biodegradable polymer. Define the term biodegradable and explain why nylon is biodegradable. [2] (vi) Explain why nylon-6,6 melts at a higher temperature than a polymer such as polythene. [2] (b) Hydroxyethanoic acid can form a polymer. (i) Draw the structural formula of the organic molecule formed from the polymerisation of three hydroxyethanoic acid molecules in acidic conditions. [2] (ii) Name the functional group formed when hydroxyethanoic acid undergoes polymerisation. [1]