UNIT 2 Matter and Change
All Matter
Pure Substance
- Made up of only 1 kind of
matter
- Has uniform and definite
composition
Element
Compound
- simplest
form
- cannot be
divided
- 2 or more different
elements chemically
combined
Mixture
- 2 or more pure
substances physically
blended together
Element
Compound
Mixture
1. Create a new form of
matter with unique
properties
1. Combine properties of its
parts
2. Fixed/definite
composition
2. Ratio between parts can
vary
3. Can only be separated
be a chemical change
3. Can be separated by
physical properties
Ex: Aspirin is always 60%
Carbon, 35.5% Oxygen and
4.5% Hydrogen.
Ex: Red + White = pink
Ex: Concrete may be 90% sand
or 85% or even 1%
Color, size, solubility, odor,
density, freezing, melting, or
boiling points

Homogeneous Mixtures
(solutions) have a uniform
composition throughout

Ex: gasoline, syrup, air
and metal alloys like
gold, steel or brass

Heterogeneous Mixtures are not uniform
in composition

Ex: orange juice, chocolate chip cookies,
lucky charms, Italian dressing, salads



A uniform part with the same properties
Since Homogeneous mixtures are uniform
throughout they only have 1 part or phase
Heterogeneous mixtures have 2 or more
distinct parts or phases
For separating liquids… use DISTILLATION
For separating liquids from solids…use FILTRATION
Pure Substance or Mixture?
1. Air
2. cobalt
3. Carbon Dioxide
4. Salt water
5. granite
6. Raisin Bran cereal
Homogeneous or Heterogeneous?
1. Blood
2. Apple
3. Oil and water
4. Raisin Bran
5. Granite
6. Tea