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Chemical ChangesIntroduction

The Electron Trade

Part of Oxidation & Reduction — GCSE Chemistry

This introduction covers The Electron Trade within Oxidation & Reduction for GCSE Chemistry. Revise Oxidation & Reduction in Chemical Changes for GCSE Chemistry with 20 exam-style questions and 20 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 1 of 13 in this topic. Use this introduction to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 1 of 13

Practice

20 questions

Recall

20 flashcards

📖 The Electron Trade

Imagine a bustling marketplace where atoms trade their most valuable possessions — electrons. Some atoms are eager sellers, desperate to give away their outer electrons. Others are hungry buyers, craving more electrons to fill their shells. Every time this trade happens, we call it a redox reaction. The atom that loses electrons gets "oxidised" (even if there's no oxygen in sight!), and the atom that gains electrons gets "reduced." This isn't just abstract chemistry — it's happening right now in the battery powering your phone, in the rusting of iron bridges, and in the photosynthesis happening in every leaf.
💰 The Money Exchange Analogy

Redox is like trading money between two people! When one person loses £10 (oxidation), someone else must gain that £10 (reduction). You can't have one without the other! The mnemonic OIL RIG helps: Oxidation Is Loss, Reduction Is Gain. Just remember: LEO the lion goes GER — Lose Electrons = Oxidation, Gain Electrons = Reduction!

Keep building this topic

Read this section alongside the surrounding pages in Oxidation & Reduction. That gives you the full topic sequence instead of a single isolated revision point.

OIL RIG — The Golden RuleDeep Dive: Understanding RedoxHow It Works: Electron Transfer in Redox

Practice Questions for Oxidation & Reduction

What does OIL stand for in the mnemonic OIL RIG?

  • A. Oxygen Is Lost
  • B. Oxidation Is Loss (of electrons)
  • C. Oxidation Involves Lithium
  • D. Oxygen Increases Level
1 markfoundation

In the reaction Mg + CuSO₄ → MgSO₄ + Cu, identify which species is oxidised and which is reduced. (2 marks)

2 marksstandard

Quick Recall Flashcards

What is OARC?
Oxidation at Anode, Reduction at Cathode — memory aid for electrolysis
What is a redox reaction?
A reaction where oxidation and reduction happen simultaneously

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OIL RIG — The Golden Rule