Chemistry 9701/23 Oct Nov 2010 | Cambridge AS Level Past Papers With Mark Scheme

1. Magnesium Isotopes: Explanation of isotopes, including the difference between 24Mg and 26Mg, calculation of relative atomic mass based on isotopic composition.
2. Magnesium and Antimony Reactions: Reactions of magnesium with chlorine, antimony's reaction with chlorine to form antimony chloride, and empirical formula determination.
3. Sulfur Chemistry: Contact process for sulfuric acid production, operating conditions, and reaction steps, including the Claus process for sulfur recovery from H2S.
4. Acid Rain: Formation of acid rain from exhaust gases of motor vehicles, environmental impact, and sulfur dioxide's role in food preservation.
5. Space Chemistry: Detection of organic molecules like acrylonitrile and vinyl alcohol in space, including their polymerization, isomerism, and reactions with various reagents.
6. Halogenoalkanes: Identifying halogenoalkanes and their reactions with silver nitrate, including differences in reactivity between bromoethane, iodoethane, and chloroethane.