Chemical Substances - Nature and Behavior

Chemical substances are materials with a uniform and definite composition. They can be classified into elements and compounds. The nature of chemical substances is defined by their physical and chemical properties, such as boiling point, melting point, and reactivity. Understanding the behavior of these substances involves studying their interactions, changes, and the laws governing these processes, such as conservation of mass. This knowledge is fundamental in chemistry, influencing everything from laboratory experiments to industrial applications.