Edexcel IGCSE Chemistry Chemistry Paper 2 January 2020 examiner report (4CH1/2CR)
Examiner report
- Q1 - 6 marks - Atoms, elements and compounds, The periodic table
- Q2 - 9 marks - Chromatography, Mixtures and separation techniques
- Q3 - 6 marks - Amounts of substance in equations, Concentration of solutions, Identification of ions, Making soluble salts
- Q4 - 7 marks - Electrolysis, Electrolysis of molten ionic compounds, Half equations at electrodes, Oxidation and reduction in terms of electrons, Properties of ionic compounds, Properties of metals and alloys
- Q5 - 13 marks - Concentration of solutions, Group 1: the alkali metals, Moles and amount of substance, Tests for gases, Volumes of gases
- Q6 - 15 marks - Bond energy calculations, Catalysts, Collision theory and activation energy, Factors affecting the rate of reaction, Fractional distillation and petrochemicals, Reaction profiles
- Q7 - 14 marks - Carboxylic acids, Conservation of mass and balanced equations, Dynamic equilibrium, Esters, Percentage yield, Producing ethanol, The effect of changing conditions on equilibrium
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