A student builds a simple circuit to find out which liquids conduct electricity. Two graphite rods are dipped into a liquid in a beaker. The rods are connected to a power supply and a lamp.
When the rods are dipped into copper chloride solution, the lamp lights and a new substance forms on each rod.
State what is meant by an electrolyte.
The student then tests dry crystals of solid copper chloride. The lamp does not light. Explain why solid copper chloride does not conduct electricity but copper chloride solution does.
The student then tests sugar solution. The lamp does not light. Suggest why sugar solution does not conduct electricity.
State the type of electric current used in electrolysis.
Name the electrode that positive ions move towards during electrolysis.
52 exam-style questions on Edexcel GCSE Chemistry 4.2 Electrolytic processes, covering 4.2.1 Electrolytes and the process of electrolysis, 4.2.2 Products of electrolysis using inert electrodes, 4.2.3 Half equations, oxidation and reduction in electrolysis, and 4.2.4 Electrolysis of copper sulfate and purifying copper. Each one has a worked solution and a mark scheme showing where the marks go.