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GCSE Chemistry · key term
An acid solution containing a relatively small amount of acid per unit volume.
Used by Edexcel and OCR
Specification 4.3 · Paper 1
A solution containing a relatively small amount of dissolved acid per unit volume.
Revise: Reactivity SeriesNo single test separates every metal clearly, so evidence from reactions with water and dilute acids is combined.
Specification C4.1e · Paper 2 (Foundation), Paper 4 (Higher)
An acid solution containing a relatively small amount of acid compared with the amount of water.
Revise: Metal ReactivityMetals less reactive than hydrogen, such as copper, silver, gold and platinum, do not normally react with dilute acids to release hydrogen.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A solution of an acid containing a relatively large amount of water and a low concentration of acid.
Revise: Order of reactivityA metal that reacts with dilute acid is more reactive than hydrogen. If there is genuinely no reaction under suitable conditions, the metal is placed below hydrogen. Hydrogen is included as a reference point even though it is not a metal.
If two metals both show no reaction with water, do not assume they are equally reactive; use dilute acid or displacement results to distinguish them.
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