When a copper penny is placed in nitric acid, a chemical change occurs. This is because nitric acid reacts with copper to produce copper nitrate, nitrogen dioxide (a gas), and water. The original substance (copper) is transformed into different substances, indicating a chemical reaction has taken place. Physical changes, on the other hand, do not alter the chemical composition of a substance. In this case, since new substances are formed, it is considered a chemical change.
is a copper penny placed is a tube of Nitric Acid and chemical or physical change
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