CAIE IGCSE Chemistry 9.5.3 Barrier methods prevent rusting by
Practise explaining how complete coatings and rust-prevention experiments stop iron contacting oxygen or water.
- Syllabus
- 2026–2028
- Course
- Chemistry 0620
Exam points
- explain painted, oily or plastic coatings by excluding oxygen and water from iron
- interpret test-tube water levels to decide whether rusting has used up oxygen
9.5.3—Barrier methods prevent rusting by question 1
[Maximum number: 1]
The metal iron and the alloy steel are commonly used materials. A problem with them is that they rust.
How does painting iron and steel prevent rusting?
prevents air / oxygen AND water from reaching the steel
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