1. Chapter 2: Matter and Change

2. 2.1: Matter Matter: Anything with volume and mass (everything)
Different States of Matter: Solid, Liquid, Gas

3. 2.1: Matter
Physical Change: Change in matter that does not change substance itself at chemical level
Phase changes are always physical changes!
Chemical Change: Change in matter that does change the substance itself
Clues: Color change, gas production (bubbles), precipitate (solid forms)
Are these changes chemical or physical?
Melting ice?
Burning magnesium?
Vinegar and baking soda?

4. 2.2+2.3 Elements, Compounds, and Mixtures
Homogenous Mixture: A MIXTURE where substance is same throughout.
Wherever I take sample, it is the same
Heterogeneous Mixture: A MIXTURE where is not same throughout
Sample will be different depending on where I take it
Pure Substance: Only one thing (a element or a compound)

5. 2.2+2.3 Elements, Compounds, and Mixtures
Element: Simplest form of matter (can’t be broken down).
All elements are found on the periodic table.
Gold (Au), Silver (Ag), Helium (He)
Compounds: Matter that can be broken down further into elements
Water (H2O), Carbon dioxide (CO2), Salt (NaCl), Sugar C6H12O6
Mixture: Multiple types of matters mixed
Air (mixture of oxygen and carbon dioxide), Kool- Aid (mixture of water and Sugar (H2O and C6H12O6)

6. Do on your own! Will help you on quiz.
Pure substance or mixture?
1) Oxygen (O2) gas:
2) An Aluminum (Al) can:
3) Methane gas (CH4):
4) Soda:
5) Helium (He) Gas:
6) A hamburger:

7. Do on your own! Will help you on quiz.
Are the following either a homogenous mixture of a heterogeneous mixture?
7) A hamburger
8) Salt water
9) Concrete
10) Cereal

8. 2.4: Elements, Compounds, Mixtures
Parts of a chemical reaction
2H2 + O2  2H20
2H2 + O2 = Reactant
2H2O = Products
Physical Property (Different than physical changes)
Property that can be observed without changing substances (often measured with senses)
Chemical Property (different than chemical change)
Property that can only be determined by a chemical reaction or attempted chemical reaction.

9. Examples: Chemical and Physical Properties
Are the following CHEMICAL or PHYSICAL properties
Blue-gray color
Brittle (breaks easy)
Rusts in rain
Insoluble in water
Melts at 1410 degrees
Reacts with fluorine