CAIE A Level Chemistry 9701 · Equilibria
A student has two aqueous solutions, P and Q, each of concentration .
Both solutions react with excess magnesium ribbon, producing hydrogen gas. The student also measures the electrical conductivity of each solution.
Compare the behaviour of solutions P and Q, using the Brønsted-Lowry theory of acids to explain the differences.
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.