CAIE IGCSE Chemistry 9.5.2 Some Common Barrier Methods Questions
Work through real CAIE IGCSE Chemistry questions to explain how coatings and barriers keep water and oxygen away from iron.
- Syllabus
- 2026–2028
- Course
- Chemistry 0620
Exam points
- describe barrier methods such as painting, oiling or plastic coating to prevent rust
- identify a suitable alternative rust-prevention method for iron or steel
- explain that a barrier prevents water and oxygen reaching the metal
CAIE IGCSE Chemistry 9.5.2 Some Common Barrier Methods Questions question 1
[Maximum number: 1]
Iron is manufactured in a blast furnace.
Steel can be coated with zinc to prevent rusting. This provides both a barrier method and sacrificial protection.
Describe another barrier method for preventing rusting.
painting / greasing / coating with plastic
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