1. Changes in Matter
Physical Change is any change that alters the form or appearance of matter but does NOT make any substance in the matter into a different substance.

2. Physical Changes Changes in State Changes in form: Solid, liquid, gas
Dissolving
Bending
Crushing
Breaking
Chopping
Filtration
Distillation

3. Chemical Changes
Chemical change- produces one or more new substances with different properties.
Evidence of chemical changes
New substance with different properties
Burning/cooking
Gas is produced (odor)
Precipitate
Endo/Exothermic reaction
Light is produced

4. Chemical Changes Examples Combustion (burning)
Electrolysis (electricity breaks a compound into its elements)
Oxidation (slow combination of a substance with oxygen) FeO2
Tarnishing (combination of sulfur with a metal)

5. The Law of Conservation of Mass
No matter is created or destroyed during a chemical or physical change.
No mass is lost, because during a chemical change, atoms are not lost or gained, only rearranged.

6. Matter and Thermal Energy
Every chemical or physical change in matter includes a change in energy.
Temperature- measures the average random motion of the particles in a substance.

7. Matter and Thermal Energy
Thermal energy is the total energy of the particles in an object.

8. Thermal Energy and Changes in Matter
Endothermic change- a change in which energy is taken in.
Exothermic change- a change in which energy is given off.