CAIE A Level Chemistry 9701 · Atomic structure
A beam of protons, a beam of neutrons and a beam of electrons, all moving at the same velocity, pass between two parallel plates that carry opposite charges. Compare the behaviour of the three beams in this electric field. Use your answer to explain how the mass and the charge of an atom are distributed.
7 marks, so the mark scheme is looking for about 7 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.