Chemistry 9701/22 Oct Nov 2019 | Cambridge AS Level Past Papers With Mark Scheme

1. Ionization Energy Trends and Group Predictions: Exploring the trend in ionization energies across Period 3, including predictions and explanations for silicon's ionization energy and the group of elements it belongs to.
2. Calculation of Isotope Abundance: Determining the percentage abundance of silicon-30 based on isotopic data and calculating relative atomic mass in silicon samples.
3. Bonding in Silicon Nitride: Discussing the bonding and structure in Si3N4, using concepts of ionic and covalent bonding to explain the observed properties.
4. Combustion of Sulfur-Containing Compounds: Writing combustion equations for sulfur-containing organic compounds and discussing the environmental consequences of sulfur dioxide emissions.
5. Equilibrium Reactions Involving SO2 and Ozone: Analyzing the effect of pressure on equilibrium and the influence of temperature on SO3 yield, based on Le Chatelier's Principle.
6. Oxide Reactions and Acid/Base Properties: Completing a table on the acid/base behavior of Period 3 oxides and explaining the amphoteric nature of beryllium hydroxide.
7. Reactions of Peroxides and Carbon Dioxide: Calculating the amount of CO2 in air and the corresponding mass of sodium peroxide that would react, followed by the drawing of a dot-and-cross diagram for the peroxide ion.
8. Phosphorus Reactions and Redox Explanation: Identifying reactions of phosphorus with chlorine, water, and ammonia, and explaining redox changes using oxidation numbers.
9. Polymer Synthesis and Properties: Analyzing the synthesis and structure of polymers, specifically the preparation of isoprenol and related reactions, including polymerization and identification of reaction mechanisms.
10. Nicotinamide Reactions and Synthesis: Understanding the delocalization of electrons in nicotinamide, its synthesis from nicotinic acid, and the reduction of nicotinamide.
11. Mass Spectrometry and NMR Spectroscopy: Interpreting mass spectrometry and NMR spectra for organic molecules, including prenol, and discussing functional groups and structural isomers.