Topic 6
Electrochemistry
At AS Level, Topic 6 is the redox processes of 6.1: calculating oxidation numbers, using changes in oxidation number to balance equations, the terms redox, oxidation, reduction and disproportionation in terms of electron transfer and oxidation number, oxidising and reducing agents, and Roman numerals. Electrode potentials and electrolysis (6.2 and 6.3) are A Level content and follow later. The redox classification page is revision support.
Revision Notes
4 revision notes, in the order the specification teaches them.
Oxidation Numbers
Oxidation numbers: 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 number changes, writing ionic half-equations and combining them into full ionic equations.
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Disproportionation
Disproportionation: recognising it with oxidation numbers, chlorine in water and alkali, hydrogen peroxide, copper(I) and which species cannot disproportionate.
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Redox Classification
Classifying reactions with oxidation numbers: redox or not, s-block and p-block examples, metals with acids, and unfamiliar equations.
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Download, print and revise the key facts of this topic at a glance.
Summary map
Download, print and revise the key facts of this topic at a glance.
Redox Map
Cambridge International AS & A Level Chemistry · 6.1 Redox processes
The whole topic on one A4 page: oxidation number rules, Roman numerals, half-equations, disproportionation 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
Every specification point in this topic, in the exam board's own words. Rate how confident you are with each one.
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Self-assessment · 10 points
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6.1.1
6.1.2
6.1.3
- b
explain and use the term oxidation in terms of electron transfer and changes in oxidation number
Revise - c
explain and use the term reduction in terms of electron transfer and changes in oxidation number
Revise - d
explain and use the term disproportionation in terms of electron transfer and changes in oxidation number
Revise
6.1.4
6.1.5
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