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Cambridge AS & A Level Chemistry

6.1Redox processes: electron transfer and changes in oxidation number (oxidation state)

Redox processes: electron transfer and changes in oxidation number (oxidation state) in Cambridge AS & A Level Chemistry: what the syllabus expects you to know, the learning objectives and how to practise.
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Learning objectives

What the syllabus expects you to be able to do.

  1. 6.1.1Calculate oxidation numbers of elements in compounds and ions.
  2. 6.1.2Use oxidation-number changes to balance equations.
  3. 6.1.3Explain redox, oxidation, reduction and disproportionation by electron transfer and oxidation number.
  4. 6.1.4Explain and use oxidising agent and reducing agent.
  5. 6.1.5Use Roman numerals to show oxidation numbers.

Lessons

  • Redox: oxidation numbers, oxidising and reducing agents

    40 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Redox processes: electron transfer and changes in oxidation number (oxidation state): sample question

1 mark

What is the oxidation number of sulfur in the tetrathionate ion, SX4OX6X2−\ce{S4O6^2-}?

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