CAIE A Level Chemistry 9701 · Nitrogen and sulfur
Nitrogen monoxide and nitrogen dioxide are both produced in the combustion chambers of internal combustion engines. In the atmosphere, these oxides can contribute to the formation of acid rain. Compare the roles of and in the formation of acid rain. In your answer, refer to both their direct roles and their catalytic role in the oxidation of atmospheric sulfur dioxide.
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.
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.