CAIE A Level Chemistry 9701 · States of matter
An ideal gas is sealed in a rigid container of fixed volume. The container is heated and the temperature of the gas rises. Explain, with reference to the kinetic theory and the assumptions of an ideal gas, why the pressure of the gas increases.
6 marks, so the mark scheme is looking for about 6 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.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.