Lesson: Chapter 16 — Changes of Matter

16.4. The activity series 3 of 6 Reset answers

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Question 3

Why is magnesium or zinc kept in contact with iron to prevent it rusting?

A They repel water B They are harder than iron C They form a thin coating on the surface of the iron D They are more reactive than iron, so they corrode in its place

The right answer is the one marked above.

They are more reactive than iron, so they corrode in its place. Mg and Zn stand above Fe in the activity series.

A metal less reactive than iron — copper, say — would not work; then it is the iron that corrodes.

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