Explain6 marksChallenge
An aqueous solution of copper(II) sulfate is electrolysed using copper electrodes. The solution is dilute. State and explain which substance is liberated at the anode.
CAIE A Level Chemistry 9701 · Electrochemistry
Electrochemistry: explain question
How this question is marked
6 marks, so the mark scheme is looking for about 6 separate creditworthy points. Making the same point twice in different words earns it once.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
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