CAIE A Level Chemistry 9701 · Electrochemistry
Consider the following reaction:
Explain, in terms of electron transfer and changes in oxidation number, the redox process that occurs. Include the oxidation numbers of the elements involved and state which species is the oxidising agent and which is the reducing agent.
4 marks, so the mark scheme is looking for about 4 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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