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Combined Science Chemistry

Chemistry study notes

Redox Chemistry

Track electrons through reactions, electrolysis and electricity-producing cells.

O-Level 5086 / 5088 (2026) / SEC G3 K326 / K328 (2027)

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2 topics

  1. Recognise oxidation and reduction

    Use the model that makes the electron change easiest to see.

  2. Identify the agent from what it does

    The oxidising agent is itself reduced.

Scope and references

Learning outcomes and sources

7. Redox Chemistry (5086 / 5088 / K326 / K328). Use the outcome map to find the explanation for a particular syllabus requirement.

See the learning outcome map

  1. 7(a) Define oxygen/hydrogen redox

    • Oxygen gain/loss
    • Hydrogen loss/gain

    Recognise oxidation and reduction

  2. 7(b) Define electron/oxidation-state redox

    • Electron loss/gain
    • Oxidation-state increase/decrease

    Recognise oxidation and reduction

  3. 7(c) Test redox agents

    • KI to brown iodine
    • Acidified KMnO4 purple to colourless

    Identify the agent from what it does