2025 OCR GCSE Chemistry A Higher Tier PAPER 4 J248/04

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OCR GCSE Chemistry A (Higher Tier) – Paper 4 (J248/04) – 2025

This paper assesses students’ understanding of the advanced chemistry concepts in the OCR GCSE Chemistry A (9–1) specification, focusing on applying knowledge, analysing data, and evaluating chemical processes at Higher Tier level.

Paper 4 examines content from the later topics of the specification, including:

Chemical analysis – tests for gases, ions, and substances, chromatography, and instrumental analysis
Chemical reactions and energy changes – reaction profiles, exothermic and endothermic reactions, and bond energies
Rates and equilibrium – factors affecting reaction rates, catalysts, reversible reactions, and dynamic equilibrium
Organic chemistry – hydrocarbons, alcohols, carboxylic acids, polymers, and reactions of organic compounds
Chemistry of the atmosphere and resources – air pollution, climate change, water treatment, and sustainable resource use

The exam includes a mixture of multiple-choice questions, structured questions, calculations, practical-based questions, and extended responses, requiring students to apply chemical principles to unfamiliar situations and real-world contexts.

This resource is ideal for exam revision, mock assessments, classroom teaching, and independent study, helping students refine exam technique and understand how to construct high-mark answers.