Chemistry (AS Level)·Electrochemistry · NSSCAS 2.2.1
Redox & oxidation numbers
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Redox reactions run batteries, extract metals and power life itself. At AS we track them precisely using oxidation numbers. Learn the rules for assigning them, how they define oxidation and reduction, how to balance redox equations, name oxyanions, and test for oxidising and reducing agents.
What you'll learn in this lesson
By the end you should be able to (NSSCAS Chemistry (AS Level) 2.2.1):
- Calculate oxidation numbers of elements in compounds and ions
- Describe and explain redox in terms of electron transfer and changes in oxidation number
- Use changes in oxidation number to balance chemical equations
- Describe the use of KI (test for oxidising agents) and acidified KMnO₄ (test for reducing agents)
- Use oxidation numbers to name oxyanions (e.g. nitrate(III), nitrate(V), chlorate(I), chlorate(V))
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