human
What are the common signs of chemical reactions?
gpt
The common signs of chemical reactions include the production of a gas, the formation of a precipitate, a change in color, and the release or absorption of heat.
Explanation: Chemical reactions often exhibit certain signs that indicate they have occurred, and these signs include visible changes in the reaction mixture, such as the formation of a gas, a precipitate, or a change in color, as well as heat transfer, either in the form of release or absorption.