ChemistryName :

Worksheet : Ch. 15 and 16 ; Obj. 17-29Date :

A. Read pp. 459 - 462 and answer the following questions.

1. _____ (T/F) A solution is a homogeneous mixture with uniform composition.

2. List two types of heterogeneous mixtures.

3. Complete the following chart :

Mixture type / Homogeneous or heterogeneous or borderline / Permanent mixture or temporary mixture / Relative particle size (small, medium or large) / Tyndall Effect ? ("yes" "no" or "sometimes) / Particle type / Can be filtered ("yes" "no" or "sometimes) / Example

4. Complete the following chart for the given colloids :

Example / Type / System
Dispersed phase / Dispersion medium
Spray paint
Shaving cream

5. The ______is the scattering of light rays as it passes through a substance.

6. ______is the chaotic and random movement of colloidal particles as they are struck by the motion of the particles of the dispersal medium.

7. ______are colloidal dispersions in which both the dispersed medium and the dispersal medium are liquids.

8. Give three examples of the above type of colloid.

9. ______are substances that cause emulsions to form and stabilize them.

10. Give two examples of the above.

11. Explain how a soap molecule causes an emulsion to form.

B. Read pp. 471 - 477 and answer the following questions.

12. What determines if a solute will dissolve in a given solvent or not?

13. List three factors which affect the rate at which a solute will dissolve.

14. _____ (T/F) The amount of surface area of a given amount of solute will increase as the particle size decreases.

15. _____ (T/F) Agitation causes more contact between solute and solvent.

16. _____ (T/F) Increased temperature slows the motion of solute and solvent and decrease the frequency and force of collisions between solute and solvent particles.

17. ______is the amount of a given solute that will dissolve in a given amount of solvent at a given temperature.

18. Match the following :

_____ saturateda. a solution which holds as much solute as possible at a given temperature

_____ unsaturatedb. a solution which holds more solute than normally possible at a given temperature

_____ supersaturatedc. a solution which holds less solute than possible at a given temperature

19. _____ (T/F) All solid solutes will increase in solubility as the temperature of the system increases.

20. _____ (T/F) The solubility of gases increases as the temperature of the system increases.

21. Thermal pollution is the "dumping" of excess heat into the environment. Explain why the thermal pollution of a body of water can cause the die-off of animal life in the body of water.

22. State Henry's law and give the mathematical expression for Henry's law.

23. If the solubility of a gas at 1.2 atm (P1) equals .50 g/L (S1), what will its solubility be at .60 atm(P2) ?

24. If I were to put a solution of potassium nitrate and a sample of solid potassium nitrate in front of you, explain how you could determine if the solution was saturated or not at that temperature.

25. Use the graph at the right to determinethe solubility of the following

  1. NaNO3 at 50 ºC : ______

b. NH3 at 60 ºC ______

  1. NH3 at 90 ºC ______

26. Identify two substances from the graph which have solubilities that decrease

with increasing temperature.