Unit b matter and chemical change notes (classifying matter)

1. Classifying Matter

2. Classifying Matter
Pure Substance:
• is made of only one kind of matter
• has a unique set of properties that sets it apart from any other
kind of matter.
• (It is further classifies into an element or a compound)
Mixture:
• is a combination of pure substances not combined chemically

3. Pure Substances
Element (Example Na or Sodium/O or Oxygen):
• Matter than cannot be broken down into any simpler substance.
• The most purest matter because it contains only one kind of atom
• Represented by a symbol on the periodic table
Compounds (H20 or CO2) :
• A substance formed by 2 or more elements chemically fixed in
proportion (molecule).

4. Pure Substances
Compounds (H20 or CO2) :
• A substance formed by 2 or more elements chemically fixed in
proportion (molecule: atoms bonded together).

5. Mixtures
Mechanical Mixture (Heterogeneous):
• Some or all particles can be seen and be separated (Ex. Salad)
Solution (Homogeneous):
• Not separate visibly, as one is dissolved in another (Ex. coffee)
• A substance dissolved in water is called an aqueous solution

6. Mixtures
Suspension:
• Mixture where tiny particles of one substance are held within
another. Substances can be separated by centrifuging or
filtration. (Ex. Salad dressing)
Colloid:
• Cloudy mixture, where the
particles are suspended
and difficult to separate
(Ex. milk)

7. Tyndall Effect
Solution vs Colloid
Solution vs Colloid

9. 1. How is an element different than a compound? Give an example of each.
2. What is the difference between a pure substance and a mixture?
3. How is a suspension different from a colloid?
4. Classify the following substances as an element, compound, or mixture:
a) Pop is composed of water, sugar, and carbon dioxide.
b) Graphite in a pencil is composed of carbon.
c) Carbon dioxide is composed of carbon and oxygen.