Chemistry 9701/33 March 2019 | Cambridge AS Level Past Papers With Mark Scheme

1. Copper Ore Composition Determination: Reaction of basic copper(II) carbonate with sulfuric acid to release CO2 gas, allowing the determination of the mole ratio of copper(II) carbonate and copper(II) hydroxide.
2. Experimental Setup for Gas Collection: Method for measuring CO2 gas volume using a water displacement system, and calculation of moles of CO2 to determine copper carbonate content.
3. Effect of Temperature on Decomposition: Hypothetical scenario to investigate how temperature changes the mass ratio of components in basic copper(II) carbonate, considering the impact on the copper(II) hydroxide component.
4. Accuracy Improvements in Decomposition Experiment: Identifying potential experimental errors and suggesting improvements, such as using a more accurate method for measuring the loss of CO2 and preventing gas leakage.
5. Copper Hydroxide Decomposition Analysis: Investigation of thermal decomposition, calculation of moles and masses of decomposition products, and confirming the presence of water of crystallization in copper ores.
6. Qualitative Testing of Cations and Anions: Performing tests to identify ions in a solution, including precipitation reactions, and deducing the chemical formula based on observations of color changes, precipitate formation, and solubility in excess reagents.