Chemistry 9701/51 May June 2016 | Cambridge AS Level Past Papers With Mark Scheme

1. Determination of the relative atomic mass of lithium using hydrogen gas measurement; apparatus setup, chemical labeling, and safe preparation of lithium.

2. Reaction completion observation and experimental precautions, including gas collection apparatus capacity calculation.

3. Lithium hydroxide titration procedure using distilled water, acid of known concentration, and steps ensuring accurate titration results.

4. Analysis of the effects of residual water in experimental equipment on the calculated relative atomic mass of lithium.

5. Evaluation of activation energy for magnesium-hydrogen ion reaction using temperature, time, and logarithmic rate calculation; graph plotting and gradient determination.

6. Reliability assessment of experimental data, influence of acid type on reaction rates, and impact of stirring or acid type changes on reaction accuracy.