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Some indicators of a chemical reaction are:

- formation of new compounds - change of color
- change of odor
- release of a gas
- change of the temperature (absorption or release)
- change of the viscosity
- formation of a precipitate
- change of general appearance
- possible explosion - sometimes a sound is produced - possible chemiluminescence

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7y ago
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11y ago

1. The formation of a precipitate (solid formed from two aqueous compounds)

2. A color change that is simply NOT the result of dilution

3. The formation of gas (bubbles)

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Q: What are the three visible signs of chemical reactions?
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