5070/21/M/J/23 · O Level Chemistry May/June 2023 Paper 21
10 questions, 80 marks. Each one links to its official mark scheme.
- Question 1 · 6 marks · Extraction of metals, Oxides, Giant covalent structures, Redox, Water, Alcohols
- Question 2 · 8 marks · Group I properties, Redox, Reactivity series, Identification of ions and gases
- Question 3 · 8 marks · The mole and the Avogadro constant, Preparation of salts, Separation and purification
- Question 4 · 9 marks · Isotopes, Ion and ionic bonds, Formulae, The mole and the Avogadro constant
- Question 5 · 10 marks · Reversible reactions and equilibrium, Rate of reaction
- Question 6 · 8 marks · Exothermic and endothermic reactions
- Question 7 · 11 marks · Formulae, functional groups and terminology, Naming organic compounds, Alkanes, Fuels, Carboxylic acids, Simple molecules and covalent bonds, Experimental design
- Question 8 · 6 marks · Electrolysis
- Question 9 · 8 marks · The mole and the Avogadro constant, Formulae, Air quality and climate, Diffusion
- Question 10 · 6 marks · Polymers, Air quality and climate
Questions and mark schemes from Cambridge International past papers. Paperstreak isn't affiliated with Cambridge.