OCR GCSE Chemistry Paper 1 2025 Mark Scheme

Download the official OCR GCSE (9–1) Chemistry A Gateway Science J248/01 Paper 1 Foundation Tier June 2025 Mark Scheme PDF for the Summer 2025 examination series. This OCR examiner-approved mark scheme contains full accepted answers, indicative content, assessment-objective breakdowns, level-of-response guidance, examiner annotations and calculation methods used during official OCR GCSE Chemistry marking.

The mark scheme covers major OCR GCSE Chemistry topics including atomic structure, ionic bonding, nanoparticles, chromatography, alloys, acids and alkalis, exothermic and endothermic reactions, reaction profiles, energy transfer, rates of reaction, electrolysis, mixtures and separation techniques. Students can revise key Chemistry concepts such as pH, neutralisation, filtration, crystallisation, surface area to volume ratio, activation energy, electronic structures and percentage calculations using authentic OCR examiner guidance.

This June 2025 OCR Chemistry mark scheme includes detailed marking guidance for multiple-choice questions, extended-response questions, graph interpretation, experimental methods, calculations and level-of-response answers. It also explains how OCR awards AO1, AO2 and AO3 marks, including scientific reasoning, practical skills, data analysis and evaluative judgement required for top-band GCSE Chemistry responses.

Perfect for GCSE Chemistry revision, mock-paper marking, examiner-standard self-assessment, classroom feedback, intervention sessions and OCR 2026 exam preparation. Best used together with the matching OCR J248/01 Question Paper for complete examiner-standard revision practice.

This document is designed for OCR GCSE (9–1) Chemistry A Gateway Science students preparing for the 2026 examination series, including Year 10 and Year 11 learners, tutors, teachers, private candidates, revision centres and home-school students studying Foundation Tier Chemistry.

It is especially useful for students aiming to improve AO1 scientific knowledge, AO2 application skills and AO3 analysis and evaluation using official OCR examiner guidance, authentic calculation methods and level-based Chemistry marking criteria.