Compare7 marksChallenge
Chlorine, bromine and iodine are molecular elements. In terms of their electron arrangements and the forces between their molecules, compare their volatility and the strength of the covalent bond within each molecule.
CAIE A Level Chemistry 9701 · Group 17
Group 17: compare question
How this question is marked
7 marks, so the mark scheme is looking for about 7 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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