Cambridge IGCSE Chemistry
9.5Corrosion of metals
Corrosion of metals in Cambridge IGCSE Chemistry: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic21 practice questions1 lesson
Learning objectives
What the syllabus expects you to be able to do.
- 9.5.1State the conditions needed for iron and steel to rust, forming hydrated iron(III) oxide.
- 9.5.2State common barrier methods of preventing rusting, including painting, greasing and coating with plastic.
- 9.5.3Describe how barrier methods prevent rusting by keeping out oxygen or water.
- 9.5.4Supplement: describe galvanising with zinc as an example of both a barrier method and sacrificial protection.
- 9.5.5Supplement: explain sacrificial protection in terms of the reactivity series and of electron loss.
Lessons
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Rusting and its prevention
30 min
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Sample question
A sample question on this topic. Answer it, check it, then read the worked answer.
Turn Corrosion of metals into a strength.
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