Finding A Solution Practice Test

Characterize each of the following solutions as unsaturated, saturated or

supersaturated before the addition of solute.

1. A solution that will produce a large amount of crystalline solid if only a small additional amount

     of solute is added

2. A solution in which additional solute can be dissolved and remain in solution.

3. A solution in which, if additional solute is added, that solute will remain undissolved at the

    bottom of the container.

Choose the letter of the answer that best completes the following

4.Ignore

5. You add sugar to your milk and cereal in the morning. You vigorously stir the milk, yet

     all the sugar does not dissolve. This is because the milk is ____  with sugar?

            A. unsaturated

            B. saturated

            C. supersaturated

6. In general, what kinetic properties do solids have?

            A. A relatively high density and a low number of particles / mL.

            B. A relatively low number of particles / mL and a relatively fast speed of particles

            C. A relatively high density and a relatively slow speed of particles.

            D. A relatively high temperature and a relatively slow speed of particles..

7. If the number of particles / mL of a substance were to increase, what would occur according

    to the kinetic theory of matter?

            A. The relative speed of particles would increase.

            B. The relative space between particles/mL would increase.

            C. The relative density would increase

            D. The relative density would stay constant.

8. Three graduated cylinders are filled with Karo Syrup. One contains 30 ml of hot syrup (105^oC).

    One contains 30 mL of cold syrup (5^oC), and one contains 30 mL of room temperature syrup

    (25^oC). Which graduated cylinder contains the most syrup molecules?

            A. The cylinder with the cold syrup.

            B. The cylinder with the room temperature syrup.

            C. The cylinder with the hot syrup.

            D. All cylinders have 30 mL of syrup, so they have the same number of syrup molecules.

9. When the energy released by the formation of solvent-solute attractions is greater than the energy

    absorbed by overcoming solute-solute and solvent-solvent attractions, the dissolving process

A. has a negative heat of solution

B. has a positive heat of solution

C. occurs rapidly

D. does not occur

10. In general, to increase the rate at which a solute dissolves you could:

A. Increase the solution's temperature           

B. Stir in the solution

            C. Powder before dissolving   

            D. All of the above

11. Which of the following is not a colligative property?

A. boiling point elevation

B. vapor-pressure lowering

C. freezing-point depression

D. solubility

12.   Ignore

13. What would occur if the temperature of a substance decreased?

            A. The relative density would stay constant.

            B. The relative number of particles/mL would decrease.

            C. The relative speed of particles would decrease.

            D. The relative density would decrease

14. Holding the temperature constant while adding more solute to an already saturated solution

      that has solute crystals at the bottom of the container:

            A. makes the solution more concentrated.

            B. causes the solution to become supersaturated

            C. causes more solute crystals to appear at the bottom of the container

            D. none of the above

15. A colligative property is one that depends on

A. the number of solute particles but not their identity

B. the identity of solute particles but not their number

C. both the number and the identity of solute particle

            D. neither the number nor the identity of solute particles

16.   What substance, from the chart to the right, would

        release (give off) the most heat when dissolved in water?

17.   If NaNO₃ is dissolved in water what would the temperature of the solution do?

            A. increase

            B. decrease

            C. remain the same

18. Small drops of wax dissolve faster in hexane than a block of wax would because the drops of

      wax have more

A. polarity

B. energy

C. surface area

D. enthalpy of solution

19. Which of the following will increase the total amount of solid solute that can be dissolved

       in 100 grams of water if that solute has a positive heat of solution?

A. stirring the solution

B. grinding up the solute

C. heating the solution

20. Which is not part of the kinetic theory of matter?

            A. Matter is in constant motion.

            B. The speed of particles decreases as temperature increases.

            C. Particles of matter have spaces between them.

            D. All matter is made up of particles.

Matching - choose the correct term for each definition.

21. ______ A solution has a large amount of solute as                                                A. Miscible

                   compared to solvent.                                                                                  B. Solution

22. ______ The dissolving medium                                                                              C. Saturated

23. ______ Contains more solute than it can theoretically                                           D. Immiscible

                   hold at a given temperature and volume                                                   E. Solute

24. ______ The substance being dissolved                                                                   F. Solvent

25. ______ Describes two liquids that are insoluble in one another                             G. Concentrate

                                                                                                                                    H. Unsaturated

                                                                                                                                     I.  Supersaturated

                                                                                                                                    J. Dilute

Identify the following type of mixture

From the chart to the right determine

29. How many grams of KNO₃ will dissolve in 200g

      of H₂0 at 50^oC?

30. From the graph, what substance shows the

     greatest decrease in solubility with increasing

     temperature?

Practice Test Answers:

   1. supersaturated

  2. unsaturated

  3. saturated

  4. C

  5. B

  6. C

  7. C

  8. A

  9. A

10. D

11. D

12. C

13. C

14. C

15. A

16. KOH

17. B

18. C

19. C

20. B

21. C

22. F

23. I

24. E

25. D

26. solution

27. colloid

28. suspension

29. 170 g

    30.  Na₂SO₄