CAIE A Level Chemistry 9701 · Electrochemistry

Electrochemistry: suggest question

Suggest4 marksStandard

Magnesium ribbon burns in nitrogen gas to form the white solid magnesium nitride, $\ce{Mg3N2}$ .

\ce{3Mg(s) + N2(g) -> Mg3N2(s)}

Suggest, in terms of electron transfer and changes in oxidation number, why this reaction is a redox reaction. Identify the oxidising agent and the reducing agent.

How this question is marked

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.

Suggest means: Apply what you know to an unfamiliar situation. There may be more than one acceptable answer. Reason from the principle you have learned to the new context, and say which principle you are using.

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