CAIE IGCSE Chemistry 9.5.5 Sacrificial Protection in Terms of the Questions
Work through real CAIE IGCSE Chemistry questions to explain sacrificial protection and choose suitable reactive metals for steel.
- Syllabus
- 2026–2028
- Course
- Chemistry 0620
Exam points
- explain sacrificial protection using electron transfer and the reactivity series
- identify magnesium or zinc as suitable sacrificial metals for iron and steel
- explain why sacrificial protection continues when zinc is scratched
- distinguish sacrificial protection from barrier coatings and identify unsuitable metals
CAIE IGCSE Chemistry 9.5.5 Sacrificial Protection in Terms of the Questions question 1
[Maximum number: 2]
This question is about metals.
Zinc is used to coat iron to prevent rusting.
When the zinc coating is scratched, the iron underneath does not rust.
Explain why the iron underneath the zinc does not rust.
M1 zinc is more reactive than iron (1)
M2 zinc is oxidised / zinc loses electrons / zinc forms positive ions / zinc forms zinc ions (1)
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