CAIE A Level Chemistry 9701 · Reaction kinetics
Two sealed flasks, A and B, of equal volume contain the same gaseous mixture of hydrogen and iodine at the same temperature. The total pressure in flask A is 100 kPa and in flask B is 200 kPa. The reaction occurs in both flasks:
Compare the rates of reaction in flasks A and B in terms of the collision theory of reaction rates.
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.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.