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Redox Reaction - GCSE Chemistry Definition

Reviewed by: Alexandra Brennan

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What is a redox reaction?

In GCSE Chemistry, a redox reaction is a chemical reaction in which both reduction (gain of electrons) and oxidation (loss of electrons) occur simultaneously. These reactions are seen in processes such as displacement reactions, combustion, corrosion, and electrolysis.

For example, in the reaction between zinc and copper sulfate:

Zn + CuSO₄ → ZnSO₄ + Cu

  • zinc loses electrons to form zinc ions (oxidation)

  • copper ions gain electrons to form copper metal (reduction)

To remember the definitions of oxidation and reduction, the term 'OIL RIG' can be used:

Oxidation Is Loss (of electrons), Reduction Is Gain (of electrons)

Redox Reactions Revision Resources to Ace Your Exams

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Alexandra Brennan

Reviewer: Alexandra Brennan

Expertise: Chemistry

Alex studied Biochemistry at Newcastle University before embarking upon a career in teaching. With nearly 10 years of teaching experience, Alex has had several roles including Chemistry/Science Teacher, Head of Science and Examiner for AQA and Edexcel. Alex’s passion for creating engaging content that enables students to succeed in exams drove her to pursue a career outside of the classroom at SME.

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