OCR A Level Chemistry A Paper 3 2025 Question Paper

Get the official OCR A-Level Chemistry A H432/03 Unified Chemistry June 2025 question paper used in the Summer 2025 OCR examination series. This authentic examiner-issued PDF contains organic, inorganic, physical, analytical, spectroscopy, equilibrium, kinetics, enthalpy, electrochemistry, and transition-metal chemistry questions exactly as presented to candidates during the live OCR assessment.

This paper includes exam questions on bromine mass spectra, proton NMR spectra of dibromoalkanes, molecular calculations involving alcohols, ibuprofen and paracetamol analysis, pH calculations for barium hydroxide, methanol equilibrium production, kinetics of bromination reactions, sulfite-ion redox chemistry, nickel complex stereoisomerism, lithium aluminium hydride reductions, nucleophilic addition mechanisms, sodium borohydride fuel cells, Hess’s law enthalpy cycles, and calorimetry calculations. Candidates are required to complete multi-step calculations, construct ionic equations, analyse reaction mechanisms, interpret spectra, determine rate equations, and evaluate enthalpy-change data. Pair it with the matching OCR H432/03 June 2025 mark scheme 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 A-Level Chemistry A students preparing for the 2026 examination series, Year 13 learners studying Unified Chemistry, retake students targeting A/A* grades, and home-schooled candidates seeking authentic OCR exam practice under timed conditions.

It is also ideal for teachers, private tutors, revision-course providers, and parents supporting Chemistry revision at home. The question paper can be used for mock examinations, spectroscopy practice, organic-mechanism revision, equilibrium calculations, electrochemistry analysis, and OCR exam-technique development.