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Reduction - GCSE Chemistry Definition

Reviewed by: Alexandra Brennan

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What is reduction?

In GCSE Chemistry, reduction can be defined as:

  • the loss of oxygen

  • the gain of electrons

For example, in the extraction of iron from iron ore in a blast furnace:

Fe₂O₃ + 3CO → 2Fe + 3CO₂

  • Iron(III) oxide is reduced to iron as it loses oxygen.

  • The iron ions gain electrons to form iron atoms:

Fe3+ + 3e-→ Fe

Reduction always occurs alongside oxidation in redox reactions, making it a fundamental concept in GCSE Chemistry. Understanding reduction is crucial for topics such as electrolysis, metal extraction, and energy changes in chemical reactions.

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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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