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GCSE Chemistry · key term
The corrosion of iron or steel when both oxygen and water are present.
Used by AQA, Edexcel and OCR
Specification 4.10.3.1 · Paper 2
The corrosion of iron or steel when both oxygen from the air and water are present.
Revise: Corrosion and PreventionRusting is one example: it affects iron and steel. Iron rusts only when it has access to both oxygen in the air and water. The reddish-brown rust is not a protective covering; rusting can continue and weaken the object.
Specification 5.2C, 5.3C · Paper 1
Revise: CorrosionIron and steel corrode by rusting when both oxygen and water are present. The rust is hydrated iron(III) oxide. It forms as iron is oxidised, leaving a reddish-brown material on the surface.
The corrosion of iron when it reacts in the presence of both oxygen and water.
The corrosion of iron when it reacts in the presence of oxygen and water, producing a reddish-brown coating.
Specification C6.1p · Paper 2 (Foundation), Paper 4 (Higher)
The corrosion of iron or steel when both oxygen and water are present, producing hydrated iron(III) oxide.
Revise: Corrosion ProcessesThe particular corrosion of iron and steel is called rusting. It needs both oxygen and water.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
The corrosion of iron or steel in the presence of both oxygen and water, producing hydrated iron(III) oxide.
Revise: Corrosion and preventionThe corrosion of iron and steel is called rusting. Rusting requires both oxygen and water.
For a rusting experiment, identify what each tube contains before drawing a conclusion: the nail with both air and water rusts, while removing either condition prevents rusting.
Do not say that all metals rust. Rusting is corrosion of iron or steel; other metals can corrode in different ways.
Do not call the corrosion of every metal ‘rusting’: rusting refers specifically to iron or steel.
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