OCR A-Level Chemistry B (Salters) Past Papers & Mark Schemes

OCR Chemistry B (Salters) — specification H433 — teaches identical chemical principles to Chemistry A but through real-world storylines that provide context before introducing theory. Each teaching unit is framed around an application: 'The Atmosphere' introduces kinetics through ozone depletion; 'Polymers and Life' introduces amino acids and proteins through biochemistry; 'The Steel Story' introduces redox and transition metals through industrial metallurgy. This context-led approach means exam questions frequently embed chemistry in real-world scenarios. Paper 1: Fundamentals of Chemistry (H433/01, 2 hours 15 minutes, 110 marks, 41%) tests the core chemical knowledge across all teaching units. Despite the context-led teaching approach, this paper examines chemistry directly — students must demonstrate understanding of atomic structure, bonding, energetics, kinetics, equilibrium, organic chemistry, and inorganic chemistry without necessarily being prompted by a real-world context. It includes multiple-choice, short-answer, and extended-response questions. Paper 2: Scientific Literacy in Chemistry (H433/02, 2 hours 15 minutes, 100 marks, 37%) centres on an advance notice article released approximately three weeks before the exam. The article describes genuine chemical research — such as green chemistry innovations, pharmaceutical development, or environmental monitoring — and exam questions require students to interpret the research, evaluate its methodology, and apply their chemical knowledge to the article's context. This paper most closely reflects the Salters philosophy of chemistry as a practical, applied discipline. Paper 3: Practical Skills in Chemistry (H433/03, 1 hour 30 minutes, 60 marks, 22%) assesses experimental competence using an insert that presents experimental data and procedures. Questions test the ability to design investigations, analyse data, evaluate precision and accuracy, and draw valid conclusions. The practical endorsement is assessed separately.