Chemistry 9701/02 May June 2006 | Cambridge AS Level Past Papers With Mark Scheme

1. Mohr’s Salt Identification: Using tests to identify cations, anions, and water of crystallization in Mohr’s salt, including reactions with sodium hydroxide, hydrochloric acid, and barium chloride to identify the components of the salt.
2. Ethyne (C2H2) Reactions: Understanding the structure of ethyne, the calculation of the amount of gas in a cylinder using the general gas equation, and the production of ethyne from calcium carbide, including mass calculations and enthalpy change calculations for combustion.
3. Halogens and Reactions: Observing the reactions of magnesium halides with concentrated sulfuric acid, the formation of precipitates, and explaining the behavior of halogens in reactions with different reagents like silver nitrate and ammonia.
4. Allyl Alcohol and Reactions: Identifying the products of allyl alcohol reactions, including halogenation, oxidation, and conversion to propanal using ruthenium(IV) catalysts or by two-step processes, and analyzing isomerism and functional group transformations.
5. Substitution Reactions: Understanding substitution reactions in organic chemistry, such as the formation of alcohols and other organic compounds, with a focus on halogenoalkanes like bromoethane and conditions for these reactions.
6. Organic Synthesis Pathways: Describing multi-step reactions in organic synthesis, such as the conversion of ethanol to propanoic acid through oxidation processes, and determining reagents and conditions for each step.