1. Unit 2 Matter
Lesson 1

2. Compounds and Mixtures

3. Classifying Matter Matter Pure Substances Mixtures
Homogeneous
Heterogeneous
Elements
Compounds
Rocky Road ice cream, muddy water, smog
Kool-aid, air, brass
Fe, O₂
H2O, CO2

4. What is a Pure Substance?
A pure substance is a classification of matter that includes both elements and compounds
Pure substances cannot be separated by physical means such as distillation, filtration, or chromatography.

5. What is an Element?
An element is a form of matter made only of one type of atom
Ex: Oxygen , carbon, nitrogen, gold
Found on the periodic table

6. What Is A Compound?
A compound is a pure substance that is created by 2 or more elements chemically reacting and bonding together
Ex: NaCl, H2O, CO2, NH3, NaHCO3, and C6H12O6
Notice that elements combine in many ways to make compounds
Ex: H2O, H2O2, CO, and CO2

7. What Is A Mixture?
A mixture is the physical combination of 2 or more substances
It is important to understand that a mixture is not chemically combined
Mixtures can be separated by physical means such as filtration, distillation, and chromatography
Mixtures can be divided into 2 groups
Homogenous mixtures
Heterogeneous mixtures

8. What Is a Homogenous Mixture?
A homogeneous mixture is a mixture that is evenly distributed. The particles are spread out evenly throughout the mixture.
Homogeneous mixtures are commonly called solutions.

9. What Is a Heterogeneous Mixture?
A heterogeneous mixture is a mixture that is unevenly distributed
Examples:
Iced tea: The ice is floating at the top and therefore is not evenly distributed throughout the tea
Chex Mix: You may find a different number of pretzels or Chex cereal in each handful; therefore, the mixture is unevenly distributed