Chemistry 9701/12 March 2017 | Cambridge AS Level Past Papers With Mark Scheme

1. Ions and Electron Configurations:
- Identifying ions with the same electronic configuration as Cl⁻ and understanding how to determine the number of protons and neutrons.

2. Molecular Formulas and Combustion:
- Using combustion data to calculate empirical and molecular formulas for hydrocarbons.
- Understanding the calculation of moles of gases involved in combustion reactions.

3. Boiling Points and Molecular Forces:
- Explaining trends in boiling points based on molecular size, electron count, and the strength of van der Waals forces.

4. Reactions and Mechanisms:
- Identifying types of reactions such as oxidation-reduction and nucleophilic substitution.
- Understanding reactions in aqueous and gaseous states, including ammonia production and reactions of halogens with metals.

5. Gas Laws:
- Using the ideal gas law to determine the gas behavior under different conditions such as temperature and pressure.

6. Equilibrium and Reaction Rates:
- Understanding equilibrium principles and how temperature and pressure affect equilibrium constants.
- Applying Le Chatelier’s Principle to predict how systems at equilibrium will respond to changes in conditions.

7. Organic Chemistry:
- Recognizing isomerism, stereoisomerism, and functional groups.
- Analyzing reaction mechanisms like electrophilic addition to alkenes and formation of esters.

8. Redox Reactions and Catalysis:
- Studying the behavior of oxidizing agents and catalysts, and understanding how they affect reaction rates and product formation.

9. Acids and Bases:
- Understanding acid-base reactions, including neutralization and reactions of acids with metal hydroxides and carbonates.