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Redox Reaction: GCSE Chemistry Definition

Alexandra Brennan

Written by: Alexandra Brennan

Reviewed by: Philippa Platt

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Contents

  1. 1. What is a redox reaction?
  2. 2. Redox Reactions Revision Resources to Ace Your Exams

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

For more information about redox reactions check out the following resources:

Explore our GCSE Chemistry Revision Resources.

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Author
Reviewer
Alexandra Brennan

Author: 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.

Philippa Platt

Author: Philippa Platt

Expertise: Chemistry

Philippa has worked as a GCSE and A level chemistry teacher and tutor for over thirteen years. She studied chemistry and sport science at Loughborough University graduating in 2007 having also completed her PGCE in science. Throughout her time as a teacher she was incharge of a boarding house for five years and coached many teams in a variety of sports. When not producing resources with the chemistry team, Philippa enjoys being active outside with her young family and is a very keen gardener

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