16 8
Gina’s teacher is investigating the electrolysis of lead bromide. Look at the diagram. It shows the apparatus she uses.
+
– molten lead bromide
(a) Solid lead bromide cannot be electrolysed but molten lead bromide can be electrolysed. Explain why. ................................................................................................................................................... ................................................................................................................................................... .............................................................................................................................................. [2] (b) Lead bromide contains lead ions, Pb2+, and bromide ions, Br–. Lead is made at the cathode (negative electrode). Write a balanced symbol equation for this reaction. Use e– to represent an electron. .............................................................................................................................................. [2]
© OCR 2014