9701/21/O/N/20 · Chemistry October/November 2020 Paper 21
4 questions, 60 marks. Each one links to its official mark scheme.
- Question 1 · 6 marks · Ionisation energy
- Question 2 · 21 marks · Reactions of Period 3 elements, Period 3 oxides and hydroxides, Lattice structures, Brønsted–Lowry theory of acids and bases, Nitrogen oxides and pollution, Thermal decomposition, Hess’s law, Dot-and-cross diagrams, Oxidation numbers, Le Chatelier's principle, Structure and properties, Chemical periodicity of other elements
- Question 3 · 17 marks · Covalent and dative bonding, Shapes of molecules, Electrons, energy levels and atomic orbitals, Metallic bonding, Period 3 oxides and hydroxides, Oxidising alcohols, Organic synthesis, Reduction and nucleophilic addition, Nitriles and hydroxynitriles, Infrared spectroscopy
- Question 4 · 16 marks · Physical properties of the Group 17 elements, Halogens and hydrogen halides, Intermolecular forces, The reactions of chlorine, Making halogenoalkanes, Addition polymers and the bromine test, Organic formulas and naming, Nucleophilic substitution reactions, Elimination, Cis/trans isomerism, Oxidising alkenes, Tests for carbonyls
Questions and mark schemes from Cambridge International past papers. Paperstreak isn't affiliated with Cambridge.