Cambridge IGCSE Chemistry Topic 5 REVISION (Electricity and Chemistry)

This is an engaging revision lesson which uses a range of exam questions, understanding checks, quiz tasks and quiz competitions to enable students to assess their understanding of the content within topic 5 (Electricity and Chemistry) of the Cambridge IGCSE Chemistry (0620) specification. The lesson covers the content in both the core and supplement sections of the specification and therefore can be used with students who will be taking the extended papers as well as the core papers.

The specification points that are covered in this revision lesson include:

CORE

• Define electrolysis as the breakdown of an ionic compound, molten or in aqueous solution, by the passage of electricity
• Describe the electrode products and the observations made during the electrolysis of a range of electrolytes
• State the general principle that metals or hydrogen are formed at the negative electrode (cathode), and that non-metals (other than hydrogen) are formed at the positive electrode (anode)
• Predict the products of the electrolysis of a specified binary compound in the molten state
• Describe the reasons for the use of copper and (steel-cored) aluminium in cables,

SUPPLEMENT

• Relate the products of electrolysis to the electrolyte and electrodes used
• Describe electrolysis in terms of the ions present and reactions at the electrodes in the examples given
• Predict the products of electrolysis of a specified halide in dilute or concentrated aqueous solution
• Construct ionic half-equations for reactions at the cathode
• Describe, in outline, the manufacture of aluminium from pure aluminium oxide in molten cryolite and chlorine, hydrogen and sodium hydroxide from concentrated aqueous sodium chloride

The students will thoroughly enjoy the range of activities, which include quiz competitions such as “Have you got the SOLUTION” where they have to compete to be the 1st to name the products at the electrodes whilst crucially being able to recognise the areas of this topic which need their further attention. This lesson can be used as revision resource at the end of the topic or in the lead up to mocks or the actual GCSE exams