Chemistry 9701/33 May June 2018 | Cambridge AS Level Past Papers With Mark Scheme

1. Sodium Oxide and Water Reactions: Writing the reaction of sodium oxide with oxygen and water, explaining the high melting point of sodium oxide due to its ionic lattice structure, and calculating pH changes when sodium oxide reacts with water.
2. Lattice Energy Calculation: Using thermodynamic data to calculate the lattice energy of sodium oxide and comparing the exothermicity of Na2O and Na2S.
3. Acid-Base Reaction and Titration: Performing a titration to determine whether an acid is monoprotic or diprotic, calculating the moles of sodium hydroxide and acid involved in the reaction, and determining the molar concentration of H+ ions.
4. Enthalpy Change of Neutralization: Determining the enthalpy change of neutralization for a monoprotic acid, calculating energy released and enthalpy change, and suggesting improvements to experimental accuracy.
5. Electrochemical Reactions: Analyzing reactions in electrolysis, including writing ionic equations for molten calcium iodide electrolysis and identifying ions involved in oxidation and reduction.
6. Transition Metal Chemistry: Studying copper complexes, including the behavior of Cu2+ in aqueous solution and its reaction with ammonia, and understanding the formation of chelates with bidentate ligands.