Chemistry 9701/11 Oct Nov 2020 | Cambridge AS Level Past Papers With Mark Scheme

1. Chemical reactions and stoichiometry: Understanding stoichiometric calculations in reactions, such as determining the mass of strontium produced in the reduction of strontium oxide, and analyzing the factors that affect reaction rates and equilibrium.
2. Ideal gas behavior and kinetic theory: Applying the ideal gas law and kinetic theory to explain the behavior of gases like krypton under different conditions, and understanding how temperature and pressure impact the reaction rates.
3. Redox reactions and enthalpy changes: Investigating the reaction profiles for the formation of KrF2, analyzing the activation energy and enthalpy changes in the process, and explaining how temperature changes affect reaction rates and equilibrium positions.
4. Qualitative analysis: Identifying cations and anions in unknown solutions through a series of chemical tests and reactions, using reagents such as ammonia, barium nitrate, and silver nitrate.
5. Bonding and molecular geometry: Drawing and analyzing the structures of complex ions and explaining their stereoisomerism and coordination number, with an emphasis on transition metals.
6. Transition metal chemistry: Exploring the properties of transition metals, their complex formation, and their reactions with different ligands, including understanding their role in catalysis and complex stability.
7. Organic chemistry mechanisms: Understanding organic reaction mechanisms such as electrophilic substitution and nucleophilic substitution, and interpreting the behavior of compounds like alkanes, alcohols, and carboxylic acids in different reactions.
8. Thermodynamics and Hess's Law: Using Hess's law to calculate enthalpy changes for complex reactions and understanding the relationship between bond energies and reaction enthalpies.
9. Polymer chemistry: Studying polymerization reactions, including the synthesis of polyamides and the identification of functional groups involved in polymer formation.
10. Electrochemical processes: Exploring electrochemical cells, including understanding the flow of electrons in redox reactions, and calculating cell potentials based on standard electrode potentials.