Chemistry 9701/12 Oct Nov 2018 | Cambridge AS Level Past Papers With Mark Scheme

1. Enthalpy Changes: Correct answers for enthalpy changes such as combustion, neutralization, and atomization based on their properties.
2. Atomic Deflections and Charges: Calculations for deflection angles of particles and the relationship between the charge/mass ratio.
3. Atomic and Ionic Radii: Comparisons of atomic and ionic radii for rubidium and bromine ions, explaining trends based on the ionic state.
4. Molecular Planarity: Identifying molecules with atoms arranged in one plane based on their structure and bonding.
5. Gas Pressure and Volume: Determining final pressure when different gases are combined under constant temperature using the ideal gas law.
6. Reaction Identity: Identifying metals based on their reactions with oxygen and the resulting oxides.
7. Combustion Enthalpy: Calculating the standard enthalpy change of combustion for ethanol using formation enthalpies.
8. Oxidation Number Changes: Identifying oxidation number changes in chemical reactions involving vanadium.
9. Equilibrium Reactions: Predicting equilibrium shifts based on temperature and pressure changes, with the help of Le Chatelier's Principle.
10. Catalyst Effects: Understanding how catalysts affect reaction rates, particle energies, and the Boltzmann distribution.
11. Reaction Rate Effects: Analyzing how iron and temperature affect the yield and rate of ammonia formation.
12. Periodic Trends: Explaining trends in melting points in Period 3 elements based on molecular structure and bonding.
13. Reactions of Chlorine: Identifying observations during reactions of silicon chloride with water.
14. Metal Nitrate Decomposition: Identifying metals from their thermal decomposition products and mass changes.
15. Comparing Magnesium and Barium: Identifying differences in ionization energies and reactivity with water between magnesium and barium.
16. Halogen Chemistry: Understanding halogen reactivity and oxidation states in reactions with hydrogen and sulfuric acid.
17. Chlorine and Sodium Hydroxide: Identifying the oxidation states of chlorine in reactions with hot and cold sodium hydroxide.
18. Contact Process: Identifying the reaction responsible for the formation of sulfur compounds and gases in industrial processes.
19. Cyanate Ion Chemistry: Understanding the chemical behavior and formula of cyanate ions in reactions.
20. Structural Isomerism: Identifying structural isomers of hydrocarbons based on molecular formulae and bonding.