1. Sorting “stuff”
Classifying matter

2. What’s the matter?
Everything that you can see, touch, taste, or smell is matter.
Matter may be hard, soft, cold, wet, dry, sharp, or even invisible!
Matter may be organized as solid, liquid and gas

3. Other than its state, what key difference would you use to classify these into two groups?
sugar
cake mix
water
gold
coca-cola
concrete ?

4. A different way to organize matter
Matter can be further organized into mixtures and pure substances.
Aha!

6. Definitions
Matter is anything that has mass and takes up space. example: coin, cat, monkey, gold non-example: energy
Pure substances are made up of only one type of matter. They cannot be separated into different substances. example: sugar, water, alcohol. non-example: coffee, salt water
Mixtures are made up of different substances. They can be separated into different substances. example: sand, coffee, milk non-example: gold, water, salt

7. Mechanical (heterogeneous) mixtures are mixtures in which the individual substances can be seen. example: sand, cookie dough, milk. non-example: coffee, salt water
Suspensions are mixtures in which droplets of one substance are held in another substance. Undisturbed, its parts will usually separate. example: oil and vinegar dressing, o.j., blood non-example: milk, sand.
Colloids are also mixtures in which droplets of one substance are held in another substance except the “drops” are so small the mixture will not usually separate easily. It looks like one substance to the naked eye. example: fog, milk, non-example: tomato juice, salt water.

9. Solutions (homogeneous mixtures) are mixtures of two or more substances in which the individual substances cannot be seen. Solutions look like pure substance, even under the microscope. example: coffee, vinegar, brass, air. non-example: mercury, alcohol, wood

10. Review

11. Pure Substance or Solution?
Pg. 21 – Fill out chart
Check and Reflect for section 2.1, pg. 23 #1-3

12. A real problem
You are given a black liquid in a test tube. It looks like only one substance.
How can you tell if it is a pure substance or a solution?
This is a real problem!

13. We must do a scientific test on the liquid!
One such test that we could do is called paper chromatography.

14. Paper chromatography is a test in which a piece of paper is placed inside the fluid to be tested.
If the fluid is a solution (i.e. not pure), the different materials will move up to different levels.

16. QuickLab
You will be given a test tube, 2 markers, and a piece of chromatography paper.
Set up the chromatography test as shown.
1 ink spot ~ 1cm from bottom
water ~0.5cm from bottom
Write a hypothesis: Is your ink a pure substance?
Do questions # 8-10 on p. 22

17. Assignment
Check and reflect p.23

18. Unused

20. possible questions