1. Mixtures!
Q: What is the chemical formula for the molecules in candy?
A: Carbon-Holmium-Cobalt-Lanthanum-Tellurium or CHoCoLaTe
Chapter 9.3 Part 2

2. Key concepts: Analyze a solution in terms of its solute and solvent
Explain how concentration affects a solution
Describe the particles in a suspension
Explain how a colloid differs from a solution and a suspension.

3. Key Vocabulary: Concentration Solubility Suspension Colloid Solvent
Solute
Solution

4. Review of Mixtures:
What does pure mean?
How is this different from an compound?
What are some examples of chemical and physical changes?
A mixture is a combination of two or more substances that are not chemically combined.
How are mixtures different from compounds?
They form a mixture when they don’t chemically react like a compound
Think about trial mix or a pizza…
Can you taste the tomato pasta? Meat?

5. New Terms for You!
Homogenous mixtures
Heterogeneous mixtures

6. Heterogeneous Mixture:
Heterogeneous mixtures are those where the substances are not distributed evenly. They usually involve a mixture of a solid in a solid. A mixture of stones in soil is an example of a heterogeneous mixture.

7. Homogenous Mixture:
Homogeneous mixtures are those where the materials are evenly distributed throughout. Homogenized milk is an example.

8. Solutions:
This is IMPURE!
How is this different from an compound?
What are some examples of dissolving?
Is it chemical or physical?
A solution is a mixture that appears to be a single substance.
Composed of particles of two or more substances that are mixed EVENLY among each other.
Dissolving:
Process in which particles of a substance separate and spread evenly throughout a mixture

9. Solutions: Composed of 2 things: Solute: substance that is dissolved
This is IMPURE!
What are some examples of dissolving?
Is it chemical or physical?
Composed of 2 things:
Solute: substance that is dissolved
Found in the lesser amount
Salt in water
Can be soluble
Able to dissolve
Can be insoluble
Unable to dissolve
Solvent: substance in which the solute is dissolved

10. Examples of Solutions:
This is IMPURE!
Table 2:
page 245
READ THIS!
Is it chemical or physical?
Solutions can be liquids or gases
Salt water
Sugar water
Solids in solids (stainless steel)
If you look at the side of a quarter, oxygen and other gases in nitrogen. Many familiar metals you can see layers of different metals. Is the coin a solid solution? Explain.
Atmosphere:
78% nitrogen
21% oxygen
And other gases
Think of any?

11. Mixtures Part 3

12. Key concepts: Analyze a solution in terms of its solute and solvent
Explain how concentration affects a solution
Describe the particles in a suspension
Explain how a colloid differs from a solution and a suspension.

13. Key Vocabulary: Concentration Solubility Suspension Colloid Solvent
Solute
Solution

14. Particles in Solution Solutions:
Make sure that you know what an alloy is..
Know the differences between solutions and colloids
Solutions:
Particles are so small NEVER settle out due to how small they are

15. Colloids vs. Suspension:
What is a colloid?
Colloid:
A mixture in which the particles are dispersed throughout but are not heavy enough to settle out.
Small and mixed well but not as good as solution
Can’t be filtered but scatter light (the particles)
Examples:
Milk, mayo, and deodorant

16. Colloids vs. Suspension:
What is a suspension?
This snow globe contains solid par- ticles that will mix with the clear liquid when you shake it up. But the particles will soon fall to the bottom when the globe is at rest.
Suspension:
A mixture in which the particles are dispersed throughout and are heavy enough to settle out.
Scatter and block light
Dirty lake water
Can be filtered
Examples:
Salad dressing, medicines, paint

17. Review:
What are the solvent and solute in a solution containing 100 grams of ethanol and 3 grams of sucrose?
Suppose you add a cup of sugar to hot water and all of the sugar dissolves. Then the water cools and some of the sugar is seen as a solid on the bottom of the beaker. Explain why this happened.

18. Homework: Flashcard for chapter 9
A neutron walks into a restaurant and orders a couple of cokes. As she is about to leave, she asks the waiter how much she owes.  The waiter replies, "For you, No Charge!!!"

19. Solubility: Solubility:
This is when the sugar can’t always be dissolved
Hot water dissolves more solute than cold water
Are gases more soluble at high or low temperatures?
Solubility:
The ability of the solute to dissolve in a solvent at a certain temperature
Most solids are more soluble in liquids at high temps, but gases are less soluble in high temps (think hot coke)

20. Graph:
What is the solubility of sodium chlorate at 60°C?

21. Speeding up the dissolving process:
Page 247
Hot water dissolves more solute than cold water
To speed up how fast solids will dissolve in liquids, you can:
Mixing
Heating
Crushing

22. Concentration of Solutions:
Concentrations:
Dilute:
Less solute in the same amount of solvent
Concentrated:
More solute in the same amount of solvent
What are some examples that you can think of for this?
Sweet vs unsweet tea
Try # 1-3 on page 246
Q-tips says, Q: If H-two-O is the formula for water, what is the formula for ice? A: H-two-O-CUBED

23. Picture: