OCR A Level Chemistry B Paper 1 2025 Question Paper

Get the official OCR A-Level Chemistry B (Salters) H433/01 Fundamentals of Chemistry June 2025 question paper used in the Summer 2025 OCR examination series. This authentic examiner-issued PDF contains physical chemistry, organic synthesis, spectroscopy, thermodynamics, kinetics, equilibrium, acids and buffers, halide chemistry, electrochemistry, polymers, and analytical-chemistry questions exactly as presented to candidates during the live OCR assessment.

This paper includes exam questions on protein structure and peptide links, greenhouse gases and infrared absorption, Tollens’ reagent oxidation chemistry, transition-metal electron configurations, catalytic converters, gas-liquid chromatography, colorimetry, ozone depletion by chlorine radicals, electrophilic addition of bromine to ethene, heterogeneous catalysis and Boltzmann distributions, triglyceride formation from oleic acid and glycerol, esterification and distillation techniques, dehydration of alcohols, IR and proton NMR spectroscopy for aromatic compounds, enthalpy changes of solution for ammonium nitrate, lattice enthalpy cycles, phosphate buffer calculations, Arrhenius activation-energy calculations, bromate–iodide redox chemistry, and qualitative analysis of halide salts containing ammonium, copper(II), and iron(II) ions. Candidates are required to complete advanced calculations, explain intermolecular forces, draw curly-arrow mechanisms, analyse spectra, interpret equilibrium systems, construct ionic equations, evaluate practical methods, and explain thermodynamic and kinetic principles. Pair it with the matching OCR H433/01 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 B (Salters) students preparing for the 2026 examination series, Year 13 learners studying Fundamentals of 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 interpretation, thermodynamics practice, equilibrium calculations, qualitative-analysis revision, and OCR exam-technique development.