Chemistry 9701/53 May June 2014 | Cambridge AS Level Past Papers With Mark Scheme

1. Thermal decomposition of magnesium nitrate to form magnesium oxide, nitrogen(IV) oxide, and oxygen, with focus on stoichiometric calculations and gas collection setup.
2. Experimental design for separating and quantifying nitrogen(IV) oxide and oxygen gases, ensuring safety with proper absorption techniques for toxic gases.
3. Determination of cell potential for metal ion concentration changes using a non-standard reference electrode (silver), plotting log[Mn+(aq)] vs. cell potential, and analyzing anomalies.
4. Derivation of charge (n) and standard electrode potential (E°) for metal ions using Nernst equation and graphical slope.
5. Overall redox reaction equations for cell systems, with proper identification of reactants and products.
6. Use of salt bridges in electrochemical cells, evaluating suitable salts (e.g., potassium nitrate, chloride) and their compatibility with cell reactions.
7. Safe handling of nitrogen(IV) oxide, including containment and ventilation measures to prevent inhalation risks during experiments.
8. Application of standard electrode potential data to identify unknown metals and predict reactivity trends.