Compare5 marksStandard
Magnesium carbonate and barium carbonate are both Group 2 carbonates. Compare their thermal decomposition reactions and explain the trend in thermal stability down Group 2.
CAIE A Level Chemistry 9701 · Group 2
Group 2: compare question
How this question is marked
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.
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