Compare5 marksStandard
Compare the lattice energies of magnesium oxide, MgO, and calcium oxide, CaO. In your answer, explain how the properties of the ions influence the magnitude of the lattice energy.
CAIE A Level Chemistry 9701 · Chemical energetics
Chemical energetics: 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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