other signs of a chemical reaction might be an increase in temperature if heat is released for a change in dash a boiling the bubbling the compound
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Several observations indicate a chemical reaction has occurred. One is the formation of a precipitate. A precipitate is a solid formed in a chemical reaction that is different from either of the reactants.
A colour change may also indicate that a chemical reaction has occurred. A reaction has occurred if two solutions are mixed and there is a colour change that is not simply the result of dilution of one of the reactant solutions.
The formation of a gas is the third sign that a reaction may have occurred. The formation of bubbles when two liquids are mixed usually indicates that gas has formed.
An increase or decrease in temperature both indicate that a chemical reaction is occurring. Here the temperature increased when two liquid samples were mixed.