5.9.4 Electrolysis (Structured Questions)


Question 1:
Diagram 1 shows the setting up of apparatus in an experiment.
(a) Name the process in Diagram 1. [1 mark]



(b)(i) Name metal Q. [1 mark]
 
(ii) What happens to metal Q during the process in Diagram 1? [1 mark]

(c) Which metal functions as the cathode? [1 mark]

(d)(i) What will happen to the iron key at the end of the experiment? [1 mark]
 
(ii) State one method to get a good result in (d)(i) [1 mark]


Answer:
(a) Electroplating

(b)(i) Copper
(b)(ii) Metal Q dissolves in the copper(II) sulphate solution to form copper ions and becomes thinner.

(c) Iron key.

(d)(i) The surface of the iron key will be coated with a brown layer of copper.
(d)(ii) The surface of the metal to be plated must be cleaned with sandpaper before electrolysis begins.

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