Formulae, functional groups and terminology: past paper questions
Real questions on formulae, functional groups and terminology
The newest 20 of 152 written questions. Open one to see it on the real paper.
- 0620/31 · May/June 2026 · Q4a(ii)[1]
Deduce the molecular formula of compound M.
See it on the paper → - 0620/31 · May/June 2026 · Q4a(iii)[1]
State why compound M is unsaturated.
See it on the paper → - 0620/32 · May/June 2026 · Q1a(ii)[1]
a gas that is approximately 78% of clean, dry air (ii)
See it on the paper → - 0620/32 · May/June 2026 · Q1a(iii)[1]
a compound in the same homologous series as ethanoic acid
See it on the paper → - 0620/32 · May/June 2026 · Q1a(iv)[1]
a hydrocarbon
See it on the paper → - 0620/32 · May/June 2026 · Q1a(v)[1]
a compound that is a product of the complete combustion of an alkane
See it on the paper → - 0620/32 · May/June 2026 · Q1a(vi)[1]
a gas that turns limewater milky
See it on the paper → - 0620/32 · May/June 2026 · Q1a(vii)[1]
a pale yellow-green gas at room temperature and pressure.
See it on the paper → - 0620/33 · May/June 2026 · Q1b[2]
State which two substances are hydrocarbons. and
See it on the paper → - 0620/33 · May/June 2026 · Q4b(i)[1]
On Figure 4.1 draw a circle around the carboxylic acid functional group.
See it on the paper → - 0620/33 · May/June 2026 · Q4b(ii)[1]
Deduce the molecular formula of compound N.
See it on the paper → - 0620/33 · May/June 2026 · Q4b(iii)[1]
State why compound N is unsaturated.
See it on the paper → - 0620/41 · May/June 2026 · Q1d[1]
photosynthesis
See it on the paper → - 0620/41 · May/June 2026 · Q7a(i)[1]
State what is meant by the term hydrocarbon.
See it on the paper → - 0620/41 · May/June 2026 · Q7a(ii)[2]
State two characteristics that all individual members of the same homologous series have in common.
See it on the paper → - 0620/41 · May/June 2026 · Q7b(i)[1]
State the meaning of the term photochemical.
See it on the paper → - 0620/41 · May/June 2026 · Q7b(ii)[2]
Draw the displayed formula of two structural isomers with the formula C 3 H 7 Cl.
See it on the paper → - 0620/42 · May/June 2026 · Q5d[3]
On Figure 5.2, complete the dot‑and‑cross diagram of a molecule of nitrogen trifluoride. F N F F Turn over
See it on the paper → - 0620/42 · May/June 2026 · Q6b(i)[1]
Deduce the number of electrons in a molecule of A. (i)
See it on the paper → - 0620/42 · May/June 2026 · Q6b(ii)[1]
State the molecular formula of B.
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What examiners said
Comprehensive responses • Most candidates could deduce the molecular formula of the given compound. Limited responses • Some candidates put ‘+’ between the elements which is not allowed in a molecular formula. • A few candidates used superscripts to show the numbers of atoms instead of subscripts.
— Examiner report, February/March 2026, 0620/32 Q2(b)(ii) (Cambridge)
Comprehensive responses • Most candidates knew the term homologous series. Limited responses • Some candidates wrote group rather than series or used the term hydrocarbon.
— Examiner report, February/March 2026, 0620/42 Q5(a) (Cambridge)
Comprehensive responses • Most candidates correctly linked chemical properties to the same functional group. Limited responses • Some candidates added in extra features which do not determine chemical properties.
— Examiner report, February/March 2026, 0620/42 Q5(b) (Cambridge)
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