CAIE A Level Chemistry 9701 · Electrochemistry

Electrochemistry: compare question

Compare5 marksStandard

Two reactions are shown below.

Reaction 1: $\ce{2FeCl3(aq) + Zn(s) -> 2FeCl2(aq) + ZnCl2(aq)}$

Reaction 2: $\ce{Cl2(g) + 2NaOH(aq) -> NaCl(aq) + NaClO(aq) + H2O(l)}$

Compare the redox changes in these two reactions. In your answer you should:

state the oxidation number changes for each element that changes oxidation state in both reactions,
identify the oxidising agent and reducing agent in each reaction,
explain what is meant by disproportionation and state, with a reason, which reaction involves disproportionation.

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5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.

Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.

Electrochemistry: compare question

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