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9 December, 16:28

What are the 4 main signs of a chemical reaction?

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Answers (2)
  1. 9 December, 19:08
    0
    There are actually five:

    1. Color change

    2. Precipitates (molar chemistry deals with these a lot)

    3. Gaseous formation

    4. Odor

    5. Release or absorption of heat (temperature change) - > this can physically be observed by release of light or heat.
  2. 9 December, 19:24
    0
    Realese of gas

    formation of a solid

    production of heat and or light
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