Explain4 marksStandard
Water has a relatively high boiling point and its solid form, ice, is less dense than the liquid. Explain both of these properties in terms of hydrogen bonding between molecules.
CAIE A Level Chemistry 9701 · Chemical bonding
Chemical bonding: explain question
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.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
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