H2 Chemistry 9729 · November 2023Chemistry (H2)

Chemistry (H2): Examiner-Report Misconception Explorers

Questions candidates found difficult on H2 Chemistry 9729 (Nov 2023) — orbital filling, hybridisation, isomer counting, benzene bonding, and diprotic acids.

Paper 1

Paper 1 Q6 — Arranging 3s and 3p electrons

Atomic structure — identifying elements from 3s/3p occupancy; Hund’s rule

Paper 1 Q16 — Not every carbon is sp³

Bonding — hybridisation and shape follow the number of electron regions

Paper 1 Q18 — Counting all the isomers

Isomerism — enumerating straight- and branched-chain structures systematically

Paper 1 Q20 — Benzene has no alternating bonds

Aromaticity — delocalised π system vs the Kekulé alternating-bond picture

Paper 1 Q29 — Sulfuric acid is diprotic

Acid–base — H₂SO₄ provides two moles of H⁺ per mole

Original reconstructions inspired by the SEAB/Cambridge Examiner Report. Not actual examination questions.

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