1. Matter

2. Matter anything that takes up space. • A liquidhas a definite volume, but no definite shape. • A gas does not have a volume or a definite shape. • A solidhas both a definite volume and a definite shape.

3. Water can change from water to ice, which is called freezing. • Freezing is what happens when a liquid changes to a solid. • Water can change from ice to water, which is called melting.

4. Melting is what happens when a solid changes to a liquid. • Water can change from water to steam, which is called evaporation. • Evaporation is what happens when a liquid changes to a gas.

5. Water can change from steam back to water, which is called condensation. • Condensation occurs when gas changes into a liquid. • The color, size, and hardness of an object can help us determine its physicalproperties.

6. Mass is the amount of matter in an object. • Weight is a measure of the pull of gravity on an object. • Volume is the amount of space an object takes up. • Volume = length x width x height

7. Density is the concentration of matter in an object. • D = M/V • Solubility the ability for one substance to dissolve in another. • Chemical changes can turn one substance into something else.

8. The following evidence can indicate that a chemical change took place:

9. Change of color e.g., rusting • Change in temperature or energy, such as the production (exothermic) or loss (endothermic) of heat. • Change of form (burning paper) (this change is difficult to reverse). • Gases formed, often appearing as bubbles

10. The ability of a substance to react chemically is called reactivity. • A Physical Change is a change in state only. The original component(s) remains.

11. The Law of Conservation of Matterstates that matter is neither created nor destroyed during a chemical or physical change.