Chemical ChangesTopic Summary
Topic Summary: Displacement Reactions
Part of Displacement Reactions — GCSE Chemistry
This topic summary covers Topic Summary: Displacement Reactions within Displacement Reactions for GCSE Chemistry. Revise Displacement Reactions in Chemical Changes for GCSE Chemistry with 20 exam-style questions and 20 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 12 of 12 in this topic. Use this topic summary to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 12 of 12
Practice
20 questions
Recall
20 flashcards
Topic Summary: Displacement Reactions
Key Terms
- Displacement: more reactive replaces less reactive
- OIL RIG: Oxidation Is Loss, Reduction Is Gain
- Spectator ion: unchanged throughout the reaction
- Ionic equation: spectator ions removed
- Exothermic: displacement reactions release heat
Must-Know Facts
- More reactive metal always displaces less reactive
- Less reactive added = no reaction
- Displacing metal is oxidised (loses electrons)
- Displaced metal ion is reduced (gains electrons)
- Mg + CuSO₄ → MgSO₄ + Cu (key example)
- Colour change: blue CuSO₄ → colourless; brown Cu forms
- Halogen displacement: Cl₂ > Br₂ > I₂