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how do we know if a substance changes chemically?​

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Answer:

The following are indicators of chemical changes: Change in Temperature. Change in Color. Noticeable Odor (after reaction has begun

Explanation:

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Production of Gases or Solids

Production of Gases or SolidsThe formation of a gas is a clue to chemical changes. The bubbles of gas that you observed form when an antacid is dropped into water is an example of change. Another clue that a chemical change has occurred is the formation of a solid.

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