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Combined Science A (Gateway) · OCR J250 · Chemistry Paper 10 · Higher · June 2025

OCR GCSE Combined Science A (Gateway) Chemistry Paper 10 Higher June 2025 examiner report (J250/10)

1h 10m 60 marks

Examiner report

  1. Q1 - 1 mark - Dynamic equilibrium
  2. Q2 - 1 mark - Rate of reaction
  3. Q3 - 1 mark - Cracking and alkenes
  4. Q4 - 1 mark - Collision theory and activation energy
  5. Q5 - 1 mark - Fractional distillation and petrochemicals
  6. Q6 - 1 mark - Crude oil, hydrocarbons and alkanes
  7. Q7 - 1 mark - Alternative methods of extracting metals
  8. Q8 - 1 mark - The composition and evolution of the atmosphere
  9. Q9 - 1 mark - Using electrolysis to extract metals
  10. Q10 - 1 mark - Reactivity of metals
  11. Q11 - 12 marks - Catalysts, Conservation of mass and balanced equations, Factors affecting the rate of reaction, Tests for gases
  12. Q12 - 9 marks - Atmospheric pollutants, Greenhouse gases and climate change
  13. Q13 - 11 marks - Electronic structure, Potable water, The periodic table
  14. Q14 - 6 marks - The effect of changing conditions on equilibrium
  15. Q15 - 8 marks - Reducing the use of resources
  16. Q16 - 4 marks - Greenhouse gases and climate change