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When silver coins are found in ancient shipwrecks, they are coated with a black crust. What question could you ask to help you decide whether the silver underwent a chemical change or a physical change?
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When silver coins are found in ancient shipwrecks, they are coated with a black crust. What question could you ask to help you decide whether the silver underwent a chemical change or a physical change?

User MarredCheese
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You could ask whether the black crust is a new substance formed from silver underwent a chemical change because a chemical change produces a new substance.
User TheRealMrCrowley
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