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Chemistry A · OCR H432 · Periodic table, elements and physical chemistry · June 2025

OCR A Level Chemistry A Periodic table, elements and physical chemistry June 2025 examiner report (H432/01)

2h 15m 100 marks

Examiner report

  1. Q1 - 1 mark
  2. Q2 - 1 mark - Empirical formulae
  3. Q3 - 1 mark - Born-Haber cycles and lattice enthalpy
  4. Q4 - 1 mark - Titrations
  5. Q5 - 1 mark
  6. Q6 - 1 mark - Bond energy calculations
  7. Q7 - 1 mark - Intermolecular forces
  8. Q8 - 1 mark - Titrations
  9. Q9 - 1 mark - Rate-determining step and mechanisms
  10. Q10 - 1 mark - Fuel cells
  11. Q11 - 1 mark - Oxidation and reduction in terms of electrons, Redox equations
  12. Q12 - 1 mark - Rate equations and orders of reaction
  13. Q13 - 1 mark
  14. Q14 - 1 mark - Group 2: the alkaline earth metals, Ionisation energies
  15. Q15 - 1 mark - Metal-aqua ions in solution, Oxidation states, Shapes of complex ions
  16. Q16 - 17 marks - Covalent bonding, Group 7: the halogens, Ionisation energies, Shapes of molecules and ions
  17. Q17 - 16 marks - Enthalpy changes, Entropy and Gibbs free energy, Equilibrium constant Kp, Hess's law, The effect of changing conditions on equilibrium
  18. Q18 - 14 marks - Determining orders of reaction, Maxwell-Boltzmann distribution, Rate equations and orders of reaction, The Arrhenius equation
  19. Q19 - 12 marks - Amounts of substance in equations, pH calculations, Redox equations
  20. Q20 - 9 marks - Electrode potentials and electrochemical cells, Redox equations
  21. Q21 - 17 marks - Complex ions and ligands, Dative covalent bonds, Empirical formulae, Metal-aqua ions in solution, Redox titrations, Shapes of complex ions, Transition metals, Variable oxidation states of transition metals