1. QQ: Answer on a sticky note to hand in.
Think about this that went well in this class over the past week. List 3 things here.
List three things that need improvement.
List 3 ways to make this 90 minute period better.
What 3 things are YOU going to do to make this class better?

3. Projects are due on Tuesday….February 21!
Funny? Not so funny?
25% of
Overall grade
Projects are due on Tuesday….February 21!

4. Today’s Objective:
Using a solubility graph, I can determine how much solute can be added to a solution.

5. Completing the lab…..

6. Endo or Exo?????

7. Solutions: Heterogenous, Homogeneous, Colloid, Suspension

8. Solute: Substance you pour in
Solvent: The receiving substance
Parts of Solutions:
Solute: Substance you pour in

9. physical or chemical changes.
Solutions can be
physical or chemical changes.
Chemical changes can NOT be separated back to original parts.
Physical changes can be separated back to original parts.

10. Solubility: The amount of a substance that can be dissolved

11. Can not hold more without precipitant forming
Saturated
Can not hold more without precipitant forming

12. Unsaturated
Can hold more solute –
no precipitant

13. Super-Saturated
Made to hold more
than normal,
usually by heating

14. Factors That Affect Solubility
1. Nature of
the reactants
2. Polarity

15. 3. Temperature:
Heating up allows more solute to be dissolved.

16. 4. Surface area
Increase the surface area will increase the rate it dissolves.

17. 5. Stirring will increase the surface area exposed and increase solubility.

18. at a certain temperature
Solubility Curve
G in H20
Temp C
Graph showing how much
can be dissolved
at a certain temperature

19. Super-saturated
G in H20
Saturated
Temp C
Unsaturated

20. Solubility Curves

21. Webwhiteboard.com

22. In the Physical Science Book:
Complete problems 1-5 on
page 71. Answer your problems completely and with detail.

23. Describe a solution at 30C with 50 g
Saturated

24. Which substance is most soluble in H20?
Yellow, NaNO2 under 70C
Blue, KNO3 over 70C
Which substance is most soluble in H20?

25. Supersaturated
Describe the saturation of a solution containing 100 g of potassium bromide solution at 60 C

26. Sodium Nitrate
The most soluble at 0 C

27. Solubility increases most between 40 & 60 C
Sodium Acetate
Solubility increases most between 40 & 60 C

28. Changes the least as temperature changes
Table Salt
Changes the least as temperature changes

29. How would cooling a solution affect its solubility?
It would hold less solute.

30. It would increase. How would decreasing the size of a solute’s
particle affect
its solubility?
It would increase.

31. A super saturated solution is cooled to room temperature
A super saturated solution is cooled to room temperature. What would it create?
Crystals

32. When will more salt dissolve than sugar?
Never, Sugar’s curve is always above salt
Sugar
Salt
When will more salt
dissolve than sugar?

33. Unit Exam
Friday