Change in color, the formation of a precipitate, formation of a gas, change of odor and temperature are the evidences that indicates a chemical reaction has occurred.
What evidence show that a chemical reaction has occurred?
There are some signs that provides information that a chemical change occur. Those signs are change in color, the formation of a precipitate, formation of a gas, change of odor, temperature change.
So we can conclude that change in color, the formation of a precipitate, formation of a gas, change of odor and temperature are the evidences that indicates a chemical reaction has occurred.
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