CAIE IGCSE Chemistry Reactivity and Electron Loss in Sacrificial Protection

Practise explaining sacrificial protection with a metal above iron in the reactivity series that loses electrons and corrodes preferentially.

Exam points

select magnesium or zinc because it is more reactive than iron and oxidises first
state that the sacrificial metal loses electrons more readily than the protected iron
reject copper or another metal below iron because it cannot provide sacrificial protection

[Maximum number: 2]

This question is about iron.

Iron forms rust.

Rusting is prevented by coating iron with zinc.

When zinc is scratched the iron becomes exposed.

Explain how the zinc continues to prevent rusting.

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