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:
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!).
NEW SUBSTANCES are created!!!

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

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

11. Practice Problem
Susie adds 10g of sodium to 15g of chlorine. How much NaCl should be present after the reaction, according to the Law of Conservation of Mass?

12. REMEMBER!
Compounds- made of up DIFFERENT types of atoms only. (ex: H2O, CO2 but not H2!)

13. Law of Conservation of Mass…?!!?!