The lab results demonstrate several key distinctions between physical changes and chemical changes. Physical changes are characterized by the alteration of a substance's form or appearance, while maintaining its chemical composition. These changes can be observed without any new substances being formed. In contrast, chemical changes involve the formation of new substances with different chemical properties. These changes are usually accompanied by a release or absorption of energy, such as heat, light, or sound. Additionally, chemical changes often involve a change in color, the production of a gas, or the formation of a precipitate. Overall, distinguishing physical changes from chemical changes involves careful observation of any alteration in form, composition, energy, or chemical properties of substances involved.
