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14 May, 19:21

If a metal changes color over time from exposure to air, what has likely occurred?

a) a chemical change

b) a reversible change

c) a change of state

d) a physical change

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  1. 14 May, 22:22
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    Option A. a chemical change

    Explanation:

    A chemical change is a change in which new substance is formed and can not be easily reversed. A change of metal color when exposed to air for a long time is simply called rusting. This is a chemical change as new substance is formed. This can be seen when Zn roofing sheets changes color over time on exposure to air.
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