Chemistry · IGCSE · Cambridge · Cambridge IGCSE (9–1) Chemistry 0971 (Extended) (2026–2028) · Specification point · 6.4 · Chemical reactions
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6.4 Redox
| Core | Supplement |
|---|---|
1 Use a Roman numeral to indicate the oxidation number of an element in a compound | 6 Define oxidation in terms of: (a) loss of electrons (b) an increase in oxidation number |
2 Define redox reactions as involving simultaneous oxidation and reduction | 7 Define reduction in terms of: (a) gain of electrons (b) a decrease in oxidation number |
3 Define oxidation as gain of oxygen and reduction as loss of oxygen | 8 Identify redox reactions as reactions involving gain and loss of electrons |
4 Identify redox reactions as reactions involving gain and loss of oxygen |
9 Identify redox reactions by changes in oxidation number using: (a) the oxidation number of elements in their uncombined state is zero (b) the oxidation number of a monatomic ion is the same as the charge on the ion (c) the sum of the oxidation numbers in a compound is zero (d) the sum of the oxidation numbers in an ion is equal to the charge on the ion |
5 Identify oxidation and reduction in redox reactions | 10 Identify redox reactions by the colour changes involved when using acidified aqueous potassium manganate(VII) or aqueous potassium iodide 11 Define an oxidising agent as a substance that oxidises another substance and is itself reduced 12 Define a reducing agent as a substance that reduces another substance and is itself oxidised 13 Identify oxidising agents and reducing agents in redox reactions |