IGCSE CHEMISTRY 0620 LESSON 9 EXPLANATION


Lesson 9
7.4 Redox
Define oxidation and reduction in terms of oxygen loss/gain. (Oxidation state limited to its use
to name ions, e.g. iron(II), iron(III), copper(II), manganate(VII).)
• Define redox in terms of electron transfer
• Identify redox reactions by changes in oxidation state and by the colour changes involved when using acidified potassium manganate(VII), and potassium iodide. (Recall of equations involvingKMnOis not required.)
• Define oxidising agent as a substance which oxidises another substance during a redox reaction. Define reducing agent as a substance which reduces another substance during a redox reaction.
• Identify oxidising agents and reducing agents from simple equations


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