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

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

User TFrazee
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Oxidation, also know as rust.....................
User Oduvan
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Oxidation, or more commonly known as, rust. It's a chemical change, and its very evident with iron metals
User Salvatore Iovene
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