Explain4 marksStandard
A sealed, rigid container holds a fixed mass of an ideal gas. The container is heated and the pressure of the gas increases. Explain, in terms of the kinetic theory of gases, why the pressure increases.
CAIE A Level Chemistry 9701 · States of matter
States of matter: 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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