Understanding Chemical and Physical Reactions

     Nothing on Earth ever really disappears, all matter is made up of tiny molecules, and when these molecules are changed the matter changes form. These changes are called reactions.

     The first way matter can change is through a physical reaction, these reactions are usually caused by some form of motion or pressure, or a change in temperature. In a physical reaction, the matter change form, but keeps the same molecules. Molecules are simply rearranged so the matter has a new shape or state

     The second way matter can change is through a chemical reaction. Theese changes occur when two or more substances combine and react to each other. These reactions cause the molecules of the substances to change, creating a new kind of matter.

Chemical and Physical Reactions example