Edexcel IGCSE Chemistry Chemistry Paper 2 January 2021 examiner report (4CH1/2C)
Examiner report
- Q1 - 5 marks - Isotopes and relative atomic mass, Subatomic particles
- Q2 - 5 marks - Atmospheric pollutants, Atoms, elements and compounds, Group 0: the noble gases, Tests for gases, The composition and evolution of the atmosphere
- Q3 - 8 marks - Carboxylic acids, Esters, Factors affecting the rate of reaction
- Q4 - 9 marks - Conservation of mass and balanced equations, Group 1: the alkali metals, The pH scale and neutralisation
- Q5 - 14 marks - Electrolysis, Electrolysis of molten ionic compounds, Extraction of metals and reduction, Half equations at electrodes, Oxidation and reduction in terms of electrons, Properties of metals and alloys, Reaction profiles, Using electrolysis to extract metals
- Q6 - 15 marks - Amounts of substance in equations, Concentration of solutions, Making soluble salts, Percentage yield
- Q7 - 14 marks - Atmospheric pollutants, Cracking and alkenes, Fractional distillation and petrochemicals, Volumes of gases
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