OCR GCSE Chemistry B Paper 2 2025 Mark Scheme

Download the official OCR GCSE (9–1) Chemistry B Twenty First Century Science J258/02 Depth in Chemistry Foundation Tier June 2025 Mark Scheme PDF for the Summer 2025 examination series. This OCR examiner-approved mark scheme contains full accepted answers, assessment-objective guidance, examiner commentary, level-of-response criteria, practical-method marking instructions and scientific calculations used during official OCR GCSE Chemistry marking.

The mark scheme covers major OCR GCSE Chemistry B topics including neutralisation, titrations, water treatment, corrosion, alloys and steels, nanoparticles, synthetic fertilisers, atom economy, reversible reactions, energy changes, Group 1 reactions and electrolysis. Students can revise key Chemistry concepts such as eutrophication, activation energy, electrolysis at electrodes, ionic bonding, nanoparticle risks, Haber process calculations and rate-of-reaction methods using authentic OCR examiner guidance.

This June 2025 OCR Chemistry mark scheme includes detailed guidance for graph interpretation, percentage calculations, practical investigations, electrolysis methods, titration techniques, ionic diagrams and level-based extended-response answers. It explains how OCR awards AO1, AO2 and AO3 marks in scientific reasoning, practical evaluation, analysis and Chemistry problem solving required for top-band GCSE responses.

Perfect for GCSE Chemistry revision, mock-paper marking, examiner-standard self-assessment, classroom assessment, intervention sessions and OCR 2026 exam preparation. Best used together with the matching OCR J258/02 Question Paper for complete examiner-standard revision practice.

This document is designed for OCR GCSE (9–1) Chemistry B Twenty First Century 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 analytical and evaluative Chemistry skills using official OCR examiner guidance, authentic calculations and practical-investigation marking criteria.