Final answer:
Chemical changes involve breaking and forming atomic bonds, leading to the creation of new substances with different properties, abiding by the Law of Conservation of Mass.
Step-by-step explanation:
When a chemical change occurs, there is a transformation at the particle level. The atomic bonds that held the original substances together are broken, allowing atoms to rearrange themselves and form new substances with distinct chemical bonds. This process is known as a chemical reaction. A chemical reaction signifies that the original substances have undergone a substantial change, resulting in the formation of new products with different properties from their predecessors. The Law of Conservation of Mass ensures that no atoms are lost or gained in the process; they are simply reorganized into new configurations, often releasing or absorbing energy in the form of heat or light.
During these reactions, there can also be observable indicators of the chemical changes taking place, such as color changes, temperature changes, the formation of a precipitate, or the evolution of gas.