DP Chemistry (first assessment 2025)

Test builder »

Question 21M.2.SL.TZ1.a

Date	May 2021	Marks available	[Maximum mark: 1]	Reference code	21M.2.SL.TZ1.a
Level	SL	Paper	2	Time zone	TZ1
Command term	Deduce	Question number	a	Adapted from	N/A

a.

[Maximum mark: 1]

21M.2.SL.TZ1.a

Deduce the ratio of Fe²⁺:Fe³⁺ in Fe₃O₄.

[1]

Markscheme

1:2 ✔

Accept 2 Fe³⁺: 1 Fe²⁺
Do not accept 2:1 only

Syllabus sections

Structure 1. Models of the particulate nature of matter » Structure 1.4—Counting particles by mass: The mole » Structure 1.4.4—The empirical formula of a compound gives the simplest ratio of atoms of each element present in that compound. The molecular formula gives the actual number of atoms of each element present in a molecule. Interconvert the percentage composition by mass and the empirical formula. Determine the molecular formula of a compound from its empirical formula and molar mass.