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GCSE Chemistry · key term
A reaction in which a more reactive element takes the place of a less reactive element in a compound.
Used by AQA, Edexcel and OCR
Specification 4.10.1.4 · Paper 2
A reaction in which a more reactive metal replaces a less reactive metal in a compound.
Revise: Alternative Metal ExtractionCopper can be obtained from a solution of a copper compound by displacement using scrap iron. Iron is more reactive than copper, so iron atoms form iron ions while copper ions become copper atoms.
Specification 4.8 · Paper 1
Link displacement to reactivity: scrap iron works because iron is more reactive than copper.
Neither biological method normally produces the metal directly. State how the metal can subsequently be recovered, for example by displacement with a more reactive metal or by electrolysis.
Do not imply that either biological method immediately produces pure metal. The collected metal compounds need further processing, such as displacement or electrolysis.
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A reaction in which a more reactive element replaces a less reactive element in one of its compounds.
Process the ash chemically to recover the metal. This may involve dissolving the compounds and then using displacement or electrolysis.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: Principles of metal extractionCarbon is more reactive than the metal, so it can remove oxygen from the metal oxide. This is a displacement reaction: carbon takes the oxygen’s place and the metal is released.