1. Properties & Changes of Matter

2. What is a property of matter?
Characteristic of that type of matter
Can be physical or chemical property
Can be observed using your senses
Cannot be observed with senses- must be tested or reacted with something

3. Physical Properties
Examples: mass, color, shape, smell, volume, density, melting point, boiling point, and hardness.

4. Chemical Properties
Examples: ability to burn, ability to decompose (food), ability to rust, how it reacts with other substances

5. Changing Matter
Matter can be changed two ways:
Physically
Chemically

6. Physical Changes Nothing new or different is formed
Do NOT CHANGE THE IDENTITY OF MATTER on a chemical level
Nothing new or different is formed
Could be a change in:
Change in state
Shape
Color
Size
Volume
Density
Mass

7. Examples of Physical Changes
Boiling
Freezing
Evaporation
Dissolving
Breaking
Cutting
Painting
Making a mixture
2 or more substances physically mixed together
Can be separated physically

8. Chemical Changes **A chemical reaction MUST take place!
Matter changes at the atomic level (atoms separate and recombine in different ways!) and NEW SUBSTANCES are created!!!

9. (New Substances!! A chemical change took place!)
Chemical Changes
Molecules are bonding and “unbonding”
Atoms are re-arranged into different combinations
For example:
CaCO3 + heat  CaO CO2
(New Substances!! A chemical change took place!)
**Did you lose any atoms?

10. Chemical Changes Rusting Burning Cooking Mixing acids & bases
Food being metabolized in body (*where??)
Baking
Explosion of fireworks

11. Chemical Changes
Atoms are just rearranged, NOT created or destroyed
Law of Conservation of Mass
Mass is conserved  total amount of atoms cannot change
Nothing is ever created or destroyed!