2025 OCR GCSE Combined Science A Chemistry PAPER 3 + MARK SCHEME

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OCR GCSE Combined Science A – Chemistry Paper 3 (Higher Tier) (J250/03) – Question Paper + Mark Scheme (2025)

This paper assesses students’ understanding of the Chemistry 1 topics in the OCR GCSE Combined Science A (9–1) specification at Higher Tier level, focusing on application, analysis, calculations, and scientific reasoning.

Paper 3 covers Chemistry 1 content, including:

Atomic structure and the periodic table – subatomic particles, electronic structure, and trends
Bonding, structure, and properties of matter – ionic, covalent, and metallic bonding
Quantitative chemistry – mole calculations, equations, concentrations, and gas volumes
Chemical changes – acids, alkalis, salts, electrolysis, and reactivity series
Energy changes – exothermic and endothermic reactions and reaction profiles

The exam includes multiple-choice questions, structured questions, calculations, data interpretation, practical-based questions, and extended responses, requiring students to apply chemical knowledge to unfamiliar contexts.

The included mark scheme provides:

Detailed marking points and accepted answers
Full calculation methods and final answers
Level-of-response descriptors for extended questions
Examiner notes explaining how marks are awarded

This resource is ideal for exam revision, mock assessments, classroom teaching, and independent study, helping students refine exam technique and achieve higher grades in Combined Science Chemistry.