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Chemistry · Edexcel 4CH1 · Chemistry Paper 1 · June 2025

Edexcel IGCSE Chemistry Chemistry Paper 1 June 2025 examiner report (4CH1/1C)

2h 110 marks

Examiner report

  1. Q1 - 8 marks - Isotopes and relative atomic mass, Subatomic particles
  2. Q2 - 8 marks - Group 1: the alkali metals, Identification of ions, The pH scale and neutralisation
  3. Q3 - 11 marks - Chromatography, Mixtures and separation techniques
  4. Q4 - 7 marks - Conservation of mass and balanced equations, Ionic bonding and ionic compounds, Relative formula mass
  5. Q5 - 14 marks - Atmospheric pollutants, Conservation of mass and balanced equations, Crude oil, hydrocarbons and alkanes, Isomerism, Organic chemistry, Properties of hydrocarbons, Properties of small molecules
  6. Q6 - 13 marks - Amounts of substance in equations, Corrosion and its prevention, Identification of ions, Oxidation and reduction in terms of electrons, Percentage yield, Reactivity of metals
  7. Q7 - 12 marks - Calorimetry, Conservation of mass and balanced equations
  8. Q8 - 9 marks - Diamond, graphite, graphene and fullerenes, Giant covalent structures
  9. Q9 - 17 marks - Addition polymerisation, Alkenes, Covalent bonding, Empirical formulae, Free-radical substitution
  10. Q10 - 11 marks - Calorimetry, Enthalpy changes, Moles and amount of substance