1. Classification of Matter
All Matter
Pure Substances
Mixtures
Element
Compound
NaCl
H 2O

2. Mixtures can further be broken down:
HETEROGENEOUS (Mechanical Mixtures)
HOMOGENEOUS (Solutions)
-particles are evenly mixed so it looks like ONE substance (uniformly mixed)
-have varying sizes of particles in the mixture (can be seen)
-can be further classified as:
Ordinary Mech. Mix.
Suspensions
Colloids
-clear (can be colored) and will not filter out
-light passes through evenly
Eg. Sugar water

3. Heterogeneous Mixtures
(Mechanical Mixtures)
Ordinary Mech. Mix.
Suspensions
Colloids
-can see the different parts
-looks like one substance but the two parts will separate out over time
-small particles of one substance suspended in another
-parts stay mixed
Eg. cookie dough gravel, cement
-CAN be filtered and WILL scatter light
-WILL scatter light
Eg. Hair Gel, Fog (Water vapour and air)
Eg. Dust and water

4. Colloid -light is scattered by the particles in the liquid
Solution light easily passes though

5. Colloids Emulsions -a liquid that is mixed in with another liquid
Eg. Milk, jelly, and salad dressing
PROBLEM: may quickly separate to form layer of the original liquids. That is why we use emulsifying agents.