Edexcel IGCSE Chemistry Chemistry Paper 2 June 2025 examiner report (4CH1/2CR)
Examiner report
- Q1 - 6 marks - Atmospheric pollutants, Greenhouse gases and climate change, Group 0: the noble gases, Tests for gases, The composition and evolution of the atmosphere
- Q2 - 5 marks - Crude oil, hydrocarbons and alkanes, Fractional distillation and petrochemicals, Organic chemistry
- Q3 - 7 marks - Mixtures and separation techniques, Oxidation and reduction in terms of electrons, Relative formula mass, Solubility and solubility curves, Tests for gases
- Q4 - 11 marks - Conservation of mass and balanced equations, Group 1: the alkali metals, Volumes of gases
- Q5 - 11 marks - Ionic bonding and ionic compounds, Metallic bonding, Properties of ionic compounds, Properties of metals and alloys, Using electrolysis to extract metals
- Q6 - 15 marks - Concentration of solutions, Conservation of mass and balanced equations, Making soluble salts, Percentage yield, Titrations
- Q7 - 15 marks - Bond energy calculations, Carboxylic acids, Esters, Producing ethanol, Reaction profiles
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