Self Quiz

Select the best answer for each of the questions below.

1. Which of the following should be least soluble in water?

a. Ba(NO₃)₂
b. NaCl
c. CH₃OH
d. H₂O₂
e. O₂

2. A white solid is poured into a beaker of water and stirred. The resulting material is a clear, colorless, homogeneous liquid. That material is a(n):

a. unsaturated solution.
b. saturated solution.
c. supersaturated solution.
d. colloidal dispersion.
e. suspension.

3. Calculate the heat of solution given the following information. When 2.0 g of a chemical (formula weight = 40 g/mole) is dissolved in 60 g of water the temperature of the water goes up 8.0°C.

a. -6.0 cal/mole
b. -6.0 kcal/mole
c. -9.6 kcal/mole
d. -240 cal/g

4. Given the following solubility rules, how soluble is ZnSO₄?

I. The sulfates of all metals are soluble except those of Pb²⁺, Hg⁺, Ba²⁺, and Ca²⁺. Silver sulfate is slightly soluble.

II. The sulfides of all metals are insoluble except those of the alkali metals and NH⁴⁺.

a. soluble
b. slightly soluble
c. insoluble

5. Refer to the solubility rules above. Will a precipitate form when a solution containing Na⁺ and S^2- is mixed with a solution containing Zn²⁺ and NO₃^-?

a. yes
b. no

6. The freezing point of a BaCl₂ solution should be _____ that of an equally concentrated NaCl solution.

a. higher than
b. lower than
c. the same as

7. What will happen in an osmosis apparatus containing water on the left side of a semipermeable membrane and sugar water on the right?

a. Water molecules will move to the right.
b. Water molecules will move to the left.
c. Sugar molecules will move to the right.
d. Sugar molecules will move to the left.

8. A chemical which partially dissociates into ions when it dissolves in water is a:

a. nonelectrolyte
b. weak electrolyte
c. strong electrolyte

Answer the following questions.

9. Explain why saturated solutions containing undissolved solute are examples of dynamic equilibrium.

10. Write an equation representing NaCl dissolving in water.

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E-mail instructor: Eden Francis

Clackamas Community College
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