1. Objective
Students will be able to classify matter as either a mixture or pure substance.

2. Agenda
Prefix Unit Conversion Review
Classification of Matter Reading

3. - Classification of Matter
II. Composition of Matter
Matter Flowchart
Mixtures
Pure Substances

5. Classification Reading
Read page. 277:
How is matter classified?
What is the definition of Homogenous Mixture?
What is the definition of a Heterogeneous Mixture?

6. Classification Reading
What is an example not listed in the book of a homogeneous mixture? Of a heterogeneous mixture?

7. Cherry vanilla ice cream Salad dressing Sugar Soil Aluminum Foil
Classify the following mixtures as either homogeneous or heterogeneous.
Flat soda pop
Cherry vanilla ice cream
Salad dressing
Sugar
Soil
Aluminum Foil
Black coffee
Sugar water
City air
Paint
Alcohol
Iron

8. Can it be separated by physical means?
A. Matter Flowchart
MATTER
yes no
Can it be separated by physical means?
MIXTURE
PURE SUBSTANCE
Is the composition uniform? no
yes
Can it be decomposed by chemical means? no
yes
Homogeneous Mixture
(solution)
Heterogeneous Mixture
Compound
Element

9. Warm-Up
What is the definition of matter
How can matter be classified?

12. Classification Reading
Read p :
What properties do all mixtures share?
Separation by Physical Means: This means that you can separate a mixture into its components, and then mix it back together again.

13. Classification Reading
One distinguishing characteristic of mixtures is that they can be separated by physical means. Look in your book and find examples of physical means used for separating mixtures.
List 3 examples of physical means of separation

14. Classification Reading
Think about a water purifier, what method of separation does it use? What other way would you choose to purify water?
Why do you think it is advantageous to separate mixtures?

15. Group Challenge
How would you separate a heterogeneous mixture of popcorn kernels and salt? Justify your steps.
Sand and magnetic iron filings?
Salt and sand?
Sand and water?
Sugar and water?

16. B. Mixtures Variable combination of 2 or more pure substances.
Homogeneous Mixture (Solution)
even distribution of components
very small particles
particles never settle
EX: saline solution

17. B. Mixtures Heterogeneous Mixture uneven distribution of components
colloids and suspensions
EX: granite

18. B. Mixtures Colloid medium-sized particles
Tyndall effect - particles scatter light (looks cloudy)
particles never settle
EX: milk

19. B. Mixtures Suspension large particles particles scatter light
particles will settle (needs to be shaken)
EX: fresh-squeezed lemonade

20. C. Pure Substances Element matter composed of identical atoms
EX: copper

21. C. Pure Substances Compound
matter composed of 2 or more elements in a fixed ratio
properties differ from those of individual elements
EX: salt (NaCl)

22. Vocabulary Chart
In your own words: