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.

Question

Claudia Novak

Chemistry

5 June, 20:55

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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Lorelai Benjamin · Answer 1

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.