Complete OCR Gateway Science A GCSE Chemistry (J248) path covering all six topics — C1 Particles, C2 Elements, compounds and mixtures, C3 Chemical reactions, C4 Predicting and identifying reactions and products, C5 Monitoring and controlling reactions, and C6 Global challenges — plus dedicated exam preparation for the Foundation and Higher tiers.
OCR GCSE Chemistry — Particles
Master Topic C1 of OCR Gateway Science A GCSE Chemistry (J248): the particle model and the three states of matter, changes of state and heating and cooling curves, the evidence for and limitations of the particle model, the structure of the atom, atomic number, mass number and isotopes, the historical development of the atomic model, electronic structure, and relative atomic mass calculations from isotopic abundance. Worked examples, required-practical and maths skills, exam tips and graded model answers for Foundation and Higher tiers.
OCR GCSE Chemistry — Elements, Compounds and Mixtures
Master Topic C2 of OCR Gateway Science A GCSE Chemistry (J248): elements, compounds, mixtures and purity; separating mixtures by filtration, crystallisation and distillation; paper chromatography and Rf values; the development and structure of the periodic table; the trends of the alkali metals, halogens and noble gases; the transition metals; ionic, covalent and metallic bonding; simple molecular, giant covalent and giant ionic structures; and nanoparticles. Worked examples, required-practical method steps, exam tips and graded model answers for Foundation and Higher tiers.
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OCR GCSE Chemistry — Chemical Reactions
Master Topic C3 of OCR Gateway Science A GCSE Chemistry (J248): conservation of mass and balanced equations, the mole and reacting masses, exothermic and endothermic reactions, reaction profiles and activation energy, oxidation and reduction, acids, bases and the pH scale, the reactions of acids and making salts, and electrolysis. Worked calculations, required-practical method steps, exam tips and graded model answers for Foundation and Higher tiers.
OCR GCSE Chemistry — Predicting and Identifying Reactions and Products
Master Topic C4 of OCR Gateway Science A GCSE Chemistry (J248): the reactivity series of metals, reactions of metals with water and acids, displacement reactions and redox, extracting metals by reduction with carbon and by electrolysis, predicting the products of reactions, and identifying products through tests for gases, flame tests and metal hydroxide tests for cations, tests for carbonate, sulfate and halide anions, and instrumental methods of analysis. Worked examples, required-practical method steps, exam tips and graded model answers for Foundation and Higher tiers.
OCR GCSE Chemistry — Monitoring and Controlling Reactions
Master Topic C5 of OCR Gateway Science A GCSE Chemistry (J248): the concentration of solutions in g/dm³ and mol/dm³, titrations and titration calculations, percentage yield, atom economy, gas volumes and amounts of substance, rates of reaction and collision theory, measuring and calculating rates, catalysts, and reversible reactions, dynamic equilibrium and Le Chatelier’s principle. Worked calculations, required-practical method steps, exam tips and graded model answers for Foundation and Higher tiers.
OCR GCSE Chemistry — Global Challenges
Master Topic C6 of OCR Gateway Science A GCSE Chemistry (J248): sustainable metal extraction by phytomining and bioleaching and by recycling, life cycle assessment and recycling, crude oil and the alkane hydrocarbons, the fractional distillation of crude oil, cracking and the alkenes, the evolution of the Earth’s atmosphere, greenhouse gases and climate change, atmospheric pollutants from burning fuels, and producing potable water and treating waste water. Worked examples, required-practical method steps, exam tips and graded model answers for Foundation and Higher tiers.
OCR GCSE Chemistry — Exam Preparation
Prepare for the OCR Gateway Science A GCSE Chemistry (J248) exams: understand the structure of the papers and the Foundation and Higher tiers, the assessment objectives, command words, and the required practicals (PAGs); master 6-mark extended-response technique, the maths and graph skills chemistry demands, and the most common mistakes; and walk through a full paper. Worked examples, exam tips and graded model answers to turn knowledge into marks.