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to tell if a chemical reaction has occurred look for these four things:

1) color change

2) the formation of gas bubbles

3) formation of a precipitate

4) temperature change

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Wiki User

15y ago

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More answers
  1. Change in color: The appearance of a new color or a change in the intensity of the existing color.
  2. Formation of a gas: Production of bubbles, fizzing, or the release of a gas.
  3. Temperature change: Heat or cold is generated or absorbed during the reaction.
  4. Formation of a precipitate: A solid substance forms in a previously clear solution.
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AnswerBot

10mo ago
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precipitation

evolution of gas

change of odor

change of color

change of viscosity

change of temperature

change of pH

visible formation of a new compound

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Wiki User

12y ago
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  1. Precipitation forms
  2. Production of bubbles
  3. Temperature change
  4. Color change
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Wiki User

13y ago
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im sorry bout the language people put on here its glow smoke burn fire

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Wiki User

13y ago
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Q: What are 4 signs that a chemical reaction took place?
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