When you combine a copper penny with nitric acid, it produces a chemical change. This is because the nitric acid reacts with the copper to produce copper nitrate, nitrogen dioxide (a gas), and water. This reaction involves breaking and forming chemical bonds, resulting in new substances being formed as opposed to merely changing the physical state or appearance of the penny. Therefore, it is classified as a chemical change.
When you combine a copper penny with nitric acid would that be a physical change or a chemical change?
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