OCR GCSE Chemistry B Paper 3 2025 Question Paper

Download the official OCR GCSE (9–1) Chemistry B Twenty First Century Science J258/03 Breadth in Chemistry Higher Tier June 2025 Question Paper PDF for the Summer 2025 examination series. This OCR examiner-set paper contains authentic GCSE Chemistry questions covering rates of reaction, catalysts, ionic bonding, polymers, greenhouse gases, corrosion, qualitative analysis and titrations.

The paper includes multiple-choice, graph-analysis, practical-method, calculation and extended-response questions on major OCR GCSE Chemistry topics including activation energy, collision theory, rusting, sacrificial protection, Group 1 and Group 7 chemistry, intermolecular forces, addition polymers, condensation polymers, conservation of mass, flame tests, emission spectroscopy and acid reactions. Students are also required to complete calculations involving reaction rates, standard form, moles, hydrogen ion concentration and pH.

Practical and analytical questions involve limestone and hydrochloric acid investigations, flame tests, titration techniques, electrolysis, representative sampling and polymer formation. The paper also tests scientific reasoning, graph interpretation, experimental planning and evaluative Chemistry skills required for OCR GCSE Chemistry examinations in 2026.

Perfect for GCSE Chemistry revision, timed mock exams, classroom assessment, practical-skills development and examiner-standard preparation. Best used together with the matching OCR J258/03 Mark Scheme for accurate self-assessment and OCR examiner feedback.

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, revision centres, private candidates and home-school students studying Higher 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 authentic OCR examination questions, higher-tier calculations and examiner-style practical investigations.