This is a concise revision resource which has been designed to cover the crucial details of topic C5 (Electricity and chemistry) of the CIE IGCSE Combined Science specification, for examination in June and November 2020 and 2021. The topic of electrolysis is commonly assessed in the examinations so time was taken during the design to ensure that understanding is constantly checked so that any misconceptions are addressed.
The following content receives particular attention in this revision lesson:
- The use of the terms electrolyte, electrode, cathode and anode
- Understanding that solid ionic compounds cannot be used in electrolysis, but only electrolytes when molten or in aqueous solution
- The attraction of positive ions to the cathode and the gain of electrons
- The attraction of negative ions to the anode and the loss of electrons
- Predicting the products at the electrodes
The lesson finishes with a summary task about the electrolysis of aluminium oxide where students have to apply their knowledge. This sheet has been differentiated two ways so that students of different abilities are able to complete the task
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