human
How do we know when a chemical reaction is taking place?
gpt
We know when a chemical reaction is taking place by observing the formation of gas bubbles, a precipitate, a color change, or an energy change.
Explanation: Chemical reactions can be identified by changes in the physical properties of the reactants, such as the formation of a gas, a solid, or a change in color, or by changes in energy, such as heating or the release of light.