CAIE A Level Chemistry 9701 · Atoms, molecules and stoichiometry
Sodium chloride, , is ionic; sulfur dioxide, , is covalent. Compare relative molecular mass and relative formula mass, explaining what each is based on and why relative formula mass is used for ionic compounds such as sodium chloride.
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.