You will complete eight required core practical activities if you are studying GCSE Chemistry, and 18 if you are studying GCSE Combined Science (five of these are in Chemistry).
You could be asked questions about the apparatus, methods, safety precautions, results, analysis and evaluation of these experiments.
There are two core practical activities in the Rates of reaction and energy changes section:
Edexcel questions courtesy of Pearson Education Ltd.
A student carries out an experiment to measure accurately the temperature changes when different metals are added to iron(II) sulfate solution.
The method for the experiment is:
a) State a suitable container for the iron(II) sulfate solution in this experiment. [1 mark]
b) State what the student should do to the mixtures during the experiment. [1 mark]
c) Explain how the student could improve the method to make a fairer comparison of the temperature change produced by the different metals. [2 marks]
a) Any one from:
b) Stir the mixtures with the thermometer 
c) Improvement with reason, eg:
Sodium thiosulfate solution, Na2S2O3, reacts with dilute hydrochloric acid:
Na2S2O3(aq) + 2HCl(aq) → 2NaCl(s) + H2O(l) + S(s) + SO2(g)
The rate of this reaction can be investigated by mixing the reactants and finding the time taken for a precipitate of sulfur to become visible.
A student wants to investigate the effect of changing the temperature on the rate of this reaction.
Devise a method the student could use to find out how the time taken for the precipitate of sulfur to become visible changes with temperature. [3 marks]
Two gases, X and Y, react to give a gaseous product Z.
The reaction is carried out under two different sets of conditions in experiments 1 and 2 as shown in the table.
|Condition||Experiment 1||Experiment 2|
Explain why it is not possible to predict what the rate of Experiment 2 will be compared with Experiment 1.
When sodium hydroxide solution is neutralised with an acid there is a temperature change.
A student is given dilute hydrochloric acid and dilute ethanoic acid of the same concentration in mol dm-3.
Devise a plan to compare the temperature changes produced when sodium hydroxide solution is neutralised with each of these two acids. [4 marks]