CAIE A Level Chemistry 9701 · Atoms, molecules and stoichiometry
The mole is an SI base unit. A ream of paper contains exactly 500 sheets and is also a counting unit. The Avogadro constant is 6.02 × mol⁻¹.
Compare the mole with the ream in terms of what each unit counts, and explain why the mole is an SI base unit but the ream is not.
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.