How is physical properties different from chemical properties?

Physical properties are characteristics of a substance that can be observed or measured without changing its chemical composition, such as color, density, melting point, and boiling point. In contrast, chemical properties describe how a substance interacts with other substances and involve changes to its chemical structure, such as reactivity, flammability, and acidity. Essentially, physical properties can be observed without altering the substance, while chemical properties are revealed during chemical reactions.