Chemistry J258,04 Higher November 2020, OCR GCSE Past Papers with Mark Schemes

1. Polymers and Recycling – Structure of PET plastics, recycling process, differences between reusing and recycling, and life cycle assessment of PET products.

2. Electrolysis and Chemical Reactions – Predicting electrode products, gas identification tests, differences in metal deposition, and experimental setups for electrolysis.

3. Crude Oil and Hydrocarbons – Fractional distillation of crude oil, boiling points and intermolecular forces, alkane vs. cycloalkane formulas, and carbon compound properties.

4. Reaction Rates and Energy Changes – Factors affecting reaction rates, graph interpretation of gas production, moles in balanced equations, and exothermic vs. endothermic reactions.

5. Ionic Bonding and Chemical Properties – Formation of ionic bonds in metal oxides, differences in formulae, and conductivity of molten vs. solid ionic compounds.

6. Environmental Chemistry and pH Testing – Sulfur dioxide pollution, pH measurements of solutions, data analysis for environmental monitoring, and contamination prevention in experiments.