1. Variable combination of 2 or more pure substances.
p.g. 59 Mixtures
Variable combination of 2 or more pure substances.
Heterogeneous – visibly separate, different parts
Homogeneous – Same throughout

2. prefixes
Homo – same
Hetero - different

3. Heterogeneous V.S. Homogeneous
Heterogeneous mixtures
Each substance can have different properties
Vegetable soup contains different substances with different properties in different concentrations.
Example: more carrots than peas with uneven distribution throughout the mixture (soup).
Homogeneous mixtures
Contain more than one substance.
Substances are mixed and distributed evenly throughout the mixture.
When mixed are difficult to see or separate out.
Example: sugar and tea, once mixed the sugar is dissolved and evenly distributed in the mixture.
We call a mixture of two or more substances that looks identical throughout a Solution.

4. Heterogeneous Mixtures
Review
Homogeneous Mixture
Solution-contains a solvent and at least one solute. (Solutes and solvents can be gas, liquid, or solid)
Heterogeneous Mixtures
Colloid-contains larger particles than a solution.
Supsension-a mixture in which particles can be seen and easily separated by settling or filtration.

5. REVIEW-Comparing Mixtures and Compounds
Substances remain the same; no chemical bonding occurs.
Can be separated by physical means.
Proportions of different substances in a mixture can vary throughout the mixture or from mixture to mixture.
Compounds
New substances formed by atoms that bond together
Can only be separated by breaking atomic chemical bonds.
Proportions of different substances are in a compound are fixed.
The type and number of atoms in a compound are always the same.

6. Mixtures of Matter
Separating Mixtures: a compound can be difficult to separate into its elements, but a mixture is usually easy to separate into its components because each component keeps its own properties
Separation Methods: magnetic attraction, filtration, distillation, and evaporation

7. Can it be physically separated?
Matter Flowchart
yes no
Can it be physically separated?
Is the composition uniform? no
yes
Can it be chemically decomposed? no
yes

8. Can it be physically separated?
Matter Flowchart
MATTER
yes no
Can it be physically separated?
MIXTURE
PURE SUBSTANCE
Is the composition uniform? no
yes
Can it be chemically decomposed? no
yes
Homogeneous Mixture
(solution)
Heterogeneous Mixture
Compound
Element
Colloids
Suspensions