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9 October, 04:14

All of the following are signs that a chemical reaction may have taken place in a piece of glass except. a. the shape of the glass changes. b. energy is used or given off. c. new substance besides glass are formed. d. the glass changes color.

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  1. 9 October, 05:17
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    All of the choices given are signs that a chemical reaction may have taken place in a piece of glass except the shape of the glass changes. The correct answer is A. This is because it is a physical change.
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