3.1.7
Oxidation, Reduction
and Redox Equations
Section 3.1.7 defines oxidation and reduction as electron loss and gain, sets out the rules for oxidation states, and asks you to write half-equations and combine them into overall redox equations. The disproportionation and classification pages are revision support: AQA uses both ideas in 3.2.3 for chlorine.
Revision Notes
Work through 3.1.7 Oxidation, Reduction and Redox Equations in a structured sequence.
Numbers
Oxidation Numbers
Oxidation states: the rules, calculating them in compounds, ions, peroxides and metal hydrides, Roman numerals and writing formulae.
Start revisingTransfer
Electron Transfer and Half-Equations
Redox as electron transfer: oxidising and reducing agents, oxidation state changes, writing ionic half-equations and combining them into full ionic equations.
Start revisingtionation
Disproportionation
Disproportionation: recognising it with oxidation states, chlorine in water and alkali, hydrogen peroxide, copper(I) and which species cannot disproportionate.
Start revisingClassification
Redox Classification
Classifying reactions with oxidation states: redox or not, s-block and p-block examples, metals with acids, and unfamiliar equations.
Start revising3.1.7 Oxidation, Reduction and Redox Equations – AQA A Level Chemistry
The following AQA specification points outline the knowledge and skills students are expected to demonstrate. Wording follows the AQA A Level Chemistry (7405) specification.
3.1.7 Oxidation, reduction and redox equations
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