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Which is an indication that a chemical change to a substance has occurred? A. It changes shape. B. New substances are formed. C. Energy is used or given off. D. both B and C

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Answer:

The answer would be D.

Explanation:

Seven Things That Indicate a Chemical Change Is Occurring

   Gas Bubbles Appear. Gas bubbles appear after a chemical reaction has occurred and the mixture becomes saturated with gas. ...

   Formation of a Precipitate. ...

   Color Change. ...

   Temperature Change. ...

   Production of Light. ...

   Volume Change. ...

   Change in Smell or Taste.

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