9701/21/O/N/18 · Chemistry October/November 2018 Paper 21
4 questions, 60 marks. Each one links to its official mark scheme.
- Question 1 · 11 marks · Electrons, energy levels and atomic orbitals, Oxidation numbers, Metallic bonding, Formulas, Reacting masses and yield
- Question 2 · 15 marks · Nitrogen and ammonia, Dot-and-cross diagrams, Temperature and activation energy, Nitrogen oxides and pollution, Brønsted–Lowry theory of acids and bases, Group 2 oxides, hydroxides and carbonates, Thermal decomposition
- Question 3 · 17 marks · Hess’s law, Homogeneous and heterogeneous catalysts, Addition polymerisation, Degradable polymers
- Question 4 · 17 marks · Organic synthesis, Tests for carbonyls, Nitriles and hydroxynitriles, Alkanes, Making halogenoalkanes, Reduction and nucleophilic addition, Characteristic organic reactions, Infrared spectroscopy, Esters
Questions and mark schemes from Cambridge International past papers. Paperstreak isn't affiliated with Cambridge.