In this module, you will learn:

  • the differences between compounds and mixtures
  • the process of electrolysis

Resources to help you:

Textbook: page 63 and 66

A simple electrolysis of water




Compounds cannot be separated by physical methods. However, they can be separated by a method called electrolysis.

Electrolysis is the process whereby an electric current is passed over a solution of the compound which causes it to separate into it's individual elements at their respective electrodes.

You should be familiar with the electrolysis of water:

In the electrolysis of water, water will break into its elements hydrogen and oxygen. Hydrogen will appear on the negative electrode (cathode) and Oxygen will appear on the positive electrode (anode).

You should also know that the volume of hydrogen produced will be 2x that of oxygen.

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