2. Mass, color, volume, and weight are examples of physical properties. A physical property can be observed or measured without changing the substance. Example: you can find weight of an object by placing it on a scale.

3. Melting point and boiling point are also physical properties. Melting point is the temperature at which a solid melts to form a liquid. The melting point of water is 0 o C. Boiling point is the temperature at which a liquid boils to form a gas. The boiling point of water is 100 o C.

4. A chemical property determines how a substance will behave during a chemical reaction.

5. A physical property of matter can be changed. For example, crushing an aluminum can involves a physical change. A physical change is a change of the appearance, shape, size, or texture of a substance. A physical change does not change the identity of a substance.

6. Some examples of physical changes include melting ice (change in state), tearing a piece of paper, and breaking a pencil.

7. A chemical change results in the formation of one or more new substances. Chemical changes happen all around us. They happen in your body (digestion and respiration). Examples: Burning (wood turns into ash and smoke), Rusting, Bleaching (bleach dissolves color), Digesting (stomach acids digest food), Photosynthesis, Cooking, Baking.

8. The process by which new substances are formed is called a chemical reaction. There are certain signs that a chemical reaction has occurred. These signs include heat, the release of gases, change in color, and giving off light.