(a)(i) List three factors which affect the discharge of ions during electrolysis

(ii) Describe in outline, the purification of copper by electrolysis.

(b) the following data were collected in an experiment on electrolysis:

Current flowing(amps)	Time of current flow (secs)	Quantity of electricity (coulombs)	Mass of metal M deposited (gram)
0.20 0.20 0.20 0.20	900 1800 2700 3600		0.06 0.12 0.18 0.24

(i) Copy and complete the table above calculating the quantity of electricity passed in each case

(ii) Plot a graph of the mass of M deposited against the quantity of electricity passed.

(iii) From the graph, determine the mass of M that was deposited by the same current passing for 20 minutes.

(iv) From the shape of the graph, which of the laws of electrolysis does the experiment verify?