OCR As Level Chemistry A Paper 2 2025 Mark Scheme

Get the official OCR AS Level Chemistry A H032/02 Depth in Chemistry mark scheme from the June 2025 examination series. This examiner-approved PDF contains the exact mark allocations, calculation methods, indicative scientific points, level-of-response descriptors, examiner annotations, and assessment-objective guidance used during live Summer 2025 OCR marking.

This mark scheme provides detailed examiner guidance for questions covering enthalpy changes of neutralisation, Group 2 ionisation energies and redox reactions, gas-volume calculations involving barium carbonate, malic-acid titration analysis, stereoisomerism, alkane combustion energetics, free-radical substitution mechanisms, haloalkane purification methods, nucleophilic substitution pathways, mass spectrometry fragmentation, infrared spectroscopy interpretation, and structural isomer identification. It includes accepted alternative answers, error-carried-forward guidance, significant-figure tolerances, mechanism-marking rules, level-of-response criteria, and OCR annotation conventions used by examiners in the live 2025 series. Pair it with the matching OCR H032/02 June 2025 question paper on markscheme.net for complete examiner-style revision and exam preparation. Updated for the 2025/2026 academic year, mobile-friendly, and instantly downloadable from markscheme.net.

This document is designed for OCR AS Level Chemistry A students preparing for the 2026 examination series, Year 12 learners studying Depth in Chemistry, retake students targeting A/A grades, and home-schooled candidates seeking examiner-level insight into OCR marking expectations.

It is also essential for teachers, private tutors, revision-course providers, and parents supporting Chemistry revision at home. The mark scheme can be used for mock-exam grading, titration-answer checking, spectroscopy interpretation practice, purification-method assessment, mechanism verification, and identifying weaknesses in OCR AS Chemistry exam technique.