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ZIMSEC O-Level Chemistry

Redox equations

Redox equations in ZIMSEC O-Level Chemistry: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic21 practice questions1 lesson

Overview

Form 4 (competency matrix 8.21.1).

Learning objectives

What the syllabus expects you to be able to do.

  1. 7.1.8.9Construct balanced redox equations, for example for displacement reactions and for the reactions at electrodes.

Lessons

  • Half-equations and redox equations

    35 min

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Sample question

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

Redox equations: sample question

1 mark

How many electrons are needed to balance this half-equation? FeX3++?eX−→Fe\ce{Fe^3+ + ?e- -> Fe}

Only if the answer has a unit, e.g. cm or km/h.

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