Chemistry 9701/41 Oct Nov 2015 | Cambridge AS Level Past Papers With Mark Scheme

1. Analysis of calcium nitrate thermal decomposition and trends in Group II nitrate stability; enthalpy of hydration and lattice energy calculations using given data.

2. Reactivity of Period 3 chlorides with water, including observations, pH determination, and balanced reaction equations.

3. Mechanisms and kinetics of nucleophilic substitution reactions; determination of reaction half-life, rate, and rate constant using concentration-time graphs.

4. Construction and use of electrochemical cells to determine standard electrode potentials; reaction equations and identification of metal identity through experimental data.

5. Synthesis and reactions of boron compounds; diborane production, alcohol formation via NaBH4 reduction, and borane-alcohol reactions with intermediate and diol structure predictions.

6. DNA replication and protein synthesis processes; nitrogenous base identification, ATP breakdown mechanisms, and the role of X-ray crystallography in structural analysis.