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Combined Science A (Gateway) · OCR J250 · Chemistry Paper 9 · Higher · June 2025

OCR GCSE Combined Science A (Gateway) Chemistry Paper 9 Higher June 2025 examiner report (J250/09)

1h 10m 60 marks

Examiner report

  1. Q1 - 1 mark - Pure substances
  2. Q2 - 1 mark - Subatomic particles
  3. Q3 - 1 mark - Diamond, graphite, graphene and fullerenes
  4. Q4 - 1 mark - Conservation of mass and balanced equations, The three states of matter
  5. Q5 - 1 mark - The periodic table
  6. Q6 - 1 mark - Chemical bonds
  7. Q7 - 1 mark - Chromatography
  8. Q8 - 1 mark - Oxidation and reduction in terms of electrons
  9. Q9 - 1 mark - The three states of matter
  10. Q10 - 1 mark - Concentration of solutions
  11. Q11 - 12 marks - Limiting reactants, Mixtures and separation techniques, Reactions of acids, The pH scale and neutralisation
  12. Q12 - 8 marks - Conservation of mass and balanced equations, Empirical formulae, Subatomic particles, The three states of matter
  13. Q13 - 6 marks - Exothermic and endothermic reactions, Reaction profiles
  14. Q14 - 11 marks - Bond energy calculations, Bonding, structure and the properties of matter, Chemical bonds, The three states of matter
  15. Q15 - 13 marks - Amounts of substance in equations, Electrolysis of aqueous solutions, Ionic bonding and ionic compounds, Reactions of acids, Tests for gases, The three states of matter