Chemistry 5070 · O Level · Electrolysis

Electrolysis — practice question

Graphite electrodes are used to electrolyse a dilute aqueous solution of magnesium chloride.
(a(i))[2]

Explain why graphite has a high melting point. Refer to its structure and bonding.

(a(ii))[1]

State one further property of graphite that makes it suitable for use as an electrode during electrolysis.

(b)[2]

Predict the products formed when dilute aqueous magnesium chloride is electrolysed using graphite electrodes. product at anode product at cathode

(c)[2]

Molten aluminium oxide is electrolysed with graphite electrodes to produce oxygen and aluminium. Construct the ionic half-equation for the reaction at each electrode. reaction at anode reaction at cathode

(d)[2]

A metal object is copper-plated. The metal object acts as the cathode during this electrolysis. State the name of the substance used for the anode and for the electrolyte. anode electrolyte

Worked solution & mark scheme

This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: a giant (covalent) structure

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