CAIE A Level Chemistry 9701 · Nitrogen and sulfur
Nitrogen monoxide, , and nitrogen dioxide, , are produced in vehicle engines. In the atmosphere, can form acid rain directly, and it can also catalyse the oxidation of sulfur dioxide, , to sulfur trioxide, .
Compare the two ways in which contributes to the formation of acid rain. In your answer, include an equation for each way.
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.