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 three core practical activities in the Chemical changes section:
Edexcel questions courtesy of Pearson Education Ltd.
The fertiliser ammonium sulfate was made by reacting ammonia solution with dilute sulfuric acid. In the first step, 25 cm3 of dilute sulfuric acid was placed in a beaker.
Give the name of a piece of apparatus that could be used to measure out the 25 cm3 of dilute sulfuric acid. [1 mark]
Electrolysis is carried out on different solutions. Electricity is passed through each solution, as shown in the diagram.
State an improvement that can be made to the circuit to show that a current is flowing during the electrolysis. [1 mark]
Lead sulfate is an insoluble salt. The method used to make the lead sulfate is:
Explain two ways of improving this experimental method to increase the amount and quality of lead sulfate obtained from the same volume of lead nitrate solution. [4 marks]
Two improvements with their reason, eg two from:
Ammonium nitrate is produced from ammonia and nitric acid on a large scale in industry.
Ammonium nitrate can also be made in the laboratory by titrating ammonia solution with dilute nitric acid solution:
NH3(aq) + HNO3(aq) → NH4NO3(aq)
Ammonium nitrate crystals can then be obtained by heating to evaporate the water from the solution.
Give two reasons why this laboratory method is not suitable for use on a large scale in industry. [2 marks]