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
4 revision notes, in the order the specification teaches them.
Oxidation Numbers
Oxidation states: the rules, calculating them in compounds, ions, peroxides and metal hydrides, Roman numerals and writing formulae.
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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.
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Disproportionation
Disproportionation: recognising it with oxidation states, chlorine in water and alkali, hydrogen peroxide, copper(I) and which species cannot disproportionate.
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Redox Classification
Classifying reactions with oxidation states: redox or not, s-block and p-block examples, metals with acids, and unfamiliar equations.
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Summary map
Download, print and revise the key facts of this topic at a glance.
Redox Map
AQA A Level Chemistry · 3.1.7 Oxidation, Reduction and Redox Equations
The whole topic on one A4 page: oxidation state rules, half-equations, combining them, agents and a table of polyatomic ions with their charges.
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Virtual Lessons
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MCQ Bank
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SAQ Bank
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Revision Game
Match reagents to products, with your board's reagents and conditions.
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Study Cards
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Specification
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3.1.7
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