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Combined Science A (Gateway) · OCR J250 · Chemistry Paper 4 · Foundation · June 2025

OCR GCSE Combined Science A (Gateway) Chemistry Paper 4 Foundation June 2025 examiner report (J250/04)

1h 10m 60 marks

Examiner report

  1. Q1 - 1 mark - The periodic table
  2. Q2 - 1 mark - Atmospheric pollutants
  3. Q3 - 1 mark - Using electrolysis to extract metals
  4. Q4 - 1 mark - Life cycle assessment
  5. Q5 - 1 mark - Extraction of metals and reduction
  6. Q6 - 1 mark - Rate of reaction
  7. Q7 - 1 mark - The periodic table
  8. Q8 - 1 mark - Potable water
  9. Q9 - 1 mark - Dynamic equilibrium
  10. Q10 - 1 mark - Rate of reaction
  11. Q11 - 9 marks - Cracking and alkenes, Crude oil, hydrocarbons and alkanes, Fractional distillation and petrochemicals, Greenhouse gases and climate change
  12. Q12 - 8 marks - The periodic table, The three states of matter
  13. Q13 - 7 marks - Greenhouse gases and climate change, The composition and evolution of the atmosphere
  14. Q14 - 6 marks - Life cycle assessment
  15. Q15 - 8 marks - Reactivity of metals
  16. Q16 - 12 marks - Catalysts, Conservation of mass and balanced equations, Factors affecting the rate of reaction, Tests for gases