5070/21/O/N/23 · O Level Chemistry October/November 2023 Paper 21
9 questions, 80 marks. Each one links to its official mark scheme.
- Question 1 · 5 marks · Air quality and climate, Water, Identification of ions and gases, Ion and ionic bonds
- Question 2 · 13 marks · Group I properties, Atomic structure and the Periodic Table, Reactivity series, Isotopes, Formulae, Rate of reaction, Reversible reactions and equilibrium, Uses of metals
- Question 3 · 8 marks · Formulae, Rate of reaction, Solids, liquids and gases
- Question 4 · 10 marks · Electrolysis, Identification of ions and gases, Redox, Simple molecules and covalent bonds
- Question 5 · 10 marks · Formulae, functional groups and terminology, Solids, liquids and gases, Alkenes, Polymers
- Question 6 · 7 marks · Air quality and climate, Reversible reactions and equilibrium, Exothermic and endothermic reactions, The characteristic properties of acids and bases, Preparation of salts
- Question 7 · 11 marks · The mole and the Avogadro constant, The characteristic properties of acids and bases, Air quality and climate, Formulae
- Question 8 · 7 marks · Reversible reactions and equilibrium, Carboxylic acids, Naming organic compounds
- Question 9 · 9 marks · Metallic bonding, Giant covalent structures, Formulae
Questions and mark schemes from Cambridge International past papers. Paperstreak isn't affiliated with Cambridge.