2025 OCR GCSE Combined Science A Chemistry PAPER 4 + MARK SCHEME

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OCR GCSE Combined Science A – Chemistry Paper 4 (Foundation Tier) (J250/04) – Question Paper + Mark Scheme (2025)

This paper assesses students’ understanding of the Chemistry 2 topics in the OCR GCSE Combined Science A (9–1) specification at Foundation Tier level, focusing on recall, simple application, and basic scientific skills.

Paper 4 covers Chemistry 2 content, including:

Chemical reactions and energy – exothermic and endothermic reactions, fuels, and energy changes
Rates of reaction – simple factors affecting reaction speed
Organic chemistry – basic hydrocarbons, fuels, and polymers
Chemical analysis – simple tests for gases and ions, chromatography, and identifying substances
Chemistry of the atmosphere – air pollution, greenhouse gases, and climate change
Using resources – water treatment, recycling, and sustainability

The exam includes multiple-choice questions, short structured questions, simple calculations, and basic data interpretation, designed to be accessible while still testing understanding of key chemistry ideas.

The included mark scheme provides:

Clear marking points and acceptable answers
Guidance for calculations and data-based questions
Examiner expectations and common mistakes

This resource is ideal for revision, classroom use, mock exams, and independent study, helping students build confidence and improve exam technique in Combined Science Chemistry.