OCR GCSE Chemistry Paper 12025 Mark Scheme

Download the official OCR GCSE (9–1) Chemistry B Twenty First Century Science J258/01 Breadth 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, indicative scientific content, assessment-objective guidance, examiner commentary, level-based criteria and calculation methods used during official OCR GCSE Chemistry marking.

The mark scheme covers major OCR GCSE Chemistry B topics including greenhouse gases, climate change, giant metallic structures, Group 1 metals, halogens, chromatography, covalent bonding, allotropes of carbon, crude oil, cracking, recycling, rates of reaction, catalysts and atomic structure. Students can revise key Chemistry concepts such as methane, electrostatic attraction, Rf values, displacement reactions, cracking hydrocarbons, surface area to volume ratio and activation energy using authentic OCR examiner guidance.

This June 2025 OCR Chemistry mark scheme includes detailed marking guidance for multiple-choice questions, graph plotting, practical investigations, calculations, equation writing and extended-response answers. It explains how OCR awards AO1, AO2 and AO3 marks in scientific reasoning, practical skills, data analysis, evaluation 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 J258/01 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.