5070/21/O/N/20 · O Level Chemistry October/November 2020 Paper 21
9 questions, 85 marks. Each one links to its official mark scheme.
- Question 1 · 5 marks · Identification of ions and gases, Fertilisers, Ion and ionic bonds, Group VII properties, Air quality and climate
- Question 2 · 10 marks · Simple molecules and covalent bonds, Formulae, Fuels, Formulae, functional groups and terminology, Alkenes, Polymers
- Question 3 · 13 marks · Metallic bonding, Identification of ions and gases, Electrolysis, Formulae, The mole and the Avogadro constant, Alloys and their properties
- Question 4 · 9 marks · Diffusion, Group VII properties, Water, Formulae, The mole and the Avogadro constant
- Question 5 · 8 marks · Transition elements, Rate of reaction, Reversible reactions and equilibrium, Formulae, Separation and purification, Redox
- Question 6 · 10 marks · Formulae, functional groups and terminology, The characteristic properties of acids and bases, Naming organic compounds, Carboxylic acids, Rate of reaction
- Question 7 · 10 marks · Extraction of metals, Redox, The mole and the Avogadro constant, Metallic bonding, Exothermic and endothermic reactions
- Question 8 · 10 marks · The mole and the Avogadro constant, Separation and purification, Formulae, Air quality and climate, Simple molecules and covalent bonds, Solids, liquids and gases
- Question 9 · 10 marks · Redox, Isotopes, Reversible reactions and equilibrium, Formulae, Preparation of salts
Questions and mark schemes from Cambridge International past papers. Paperstreak isn't affiliated with Cambridge.