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Edexcel IGCSE Chemistry 1.59C electrolysis half-equations

Practise half-equation questions by balancing ions and electrons, then explaining oxidation or reduction from electron transfer.

Syllabus
First assessment 2019
Course
Chemistry 4CH1

Exam points

  • Write half-equations for electrode products such as metal atoms, hydrogen or halogen molecules.
  • Classify oxidation or reduction by stating which ion loses or gains electrons.
  • Balance charges and electrons in ionic half-equations, ignoring unnecessary state symbols.

1.59C Electrolysis half-equations question 1

[Maximum number: 1]

This question is about Group 2 elements and their compounds.

A concentrated aqueous solution of magnesium chloride is electrolysed. Chlorine forms at the positive electrode.

Give the half-equation for the reaction at the positive electrode.

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