(a)[2]
Define electrolysis.
(b(i))[1]
Name the principal gas formed at the positive electrode (anode).
(b(ii))[2]
Describe a test for the gas made in (b)(i).
(b(iii))[2]
Write the ionic half-equation for the process taking place at the negative electrode (cathode).
(c)[2]
Name the particle type that carries charge in the wires and in the electrolyte.
(d)[2]
Suggest two differences that the student would observe.
(e(i))[3]
Complete the labels on the diagram showing the student’s electrolysis experiment.
(e(ii))[3]
Use your knowledge of the reactivity series to predict what happens to the silver and zinc impurities. Explain your answers.