The electrolysis of other molten substances
2 marks · NormalComplete the ionic half-equations for the electrolysis of molten copper(II) bromide. Include state symbols.
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Must show: Cu^{2+}(l) + 2e^- \to Cu(s), 2Br^-(l) \to Br_2(g) + 2e^-
Also accept: Cu^{2+}(l) + 2e^- \to Cu(s); 2Br^-(l) \to Br_2(g) + 2e^-
Common mistakes: Forgetting state symbols; Incorrect electron numbers
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Marking points
B1 · 1 mark · Completes Cu^{2+}(l) + 2e^- \to Cu(s)
B2 · 1 mark · Completes 2Br^-(l) \to Br_2(g) + 2e^-
Worked solution