Solubility Factors Quiz

Answer each question by clicking the correct blue button. Only the first answer selected is graded.

Use the solubility curve below to answer questions 1 and 2:

1.  Which of these statements is supported by the graph shown above?
A. More KNO₃ will dissolve than KBr at 0°C.
B. Temperature has little effect on the water solubility of NaCl.
C. KBr is insoluble in water at low temperatures.
D. An increase in temperature causes a decrease in the solubility of NaClO₃ in water.

2.  At 40°C, 100 grams of NaClO₃ is added to 100 grams of water.   What will happen if an additional 10 grams of NaClO₃ is added to the solution?
A. All 10 grams will dissolve.
B. 5 grams will dissolve and 5 grams will settle to the bottom of the solution.
C. All 10 grams will settle to the bottom of the solution.
D. All 110 grams of NaClO₃ will crystallize out of solution.

3.  As the pressure increases,
A. the solubility of a gas in a liquid increases.
B. the solubility of a gas in a liquid decreases.
C. the solubility of a solid in a liquid increases.
D. the solubility of a solid in a liquid decreases.

4.  Before the health dangers of its use were known, carbon tetrachloride was used as a dry cleaning solvent because it was so effective in removing oils and grease. Water will not remove these substances from clothing. Which of the following statements is most likely true?
A. Oils are nonpolar and carbon tetrachloride is polar.
B. Carbon tetrachloride is under greater pressure than water.
C. Carbon tetrachloride has a greater density than water.
D. Both oils and carbon tetrachloride are nonpolar.

5.  A solute was added to a solvent and mixed well.  Some of the solute settled to the bottom of the container.  Which statement best explains why all of the solute did not dissolve?
A. The solution was unsaturated.
B. The solute was not soluble in the solvent.
C. The solution was heated to increase solubility.
D. The solution had become saturated.

6.  Which of the following statements is true regarding the effect of thermal pollution on the organisms living in a lake?
A. More dissolved oxygen will be present because an increase in temperature will increase the solubility of oxygen gas in the water.
B. The lake will be able to support more organisms because organisms grow better in warm water.
C. The water in the warmer lake will contain less dissolved oxygen gas, so fewer organisms that require oxygen will be able to live there.
D. Thermal pollution has no effect on the organisms in the lake.

7.  How does breaking up a sugar cube that sits on the bottom of the glass affect its ability to dissolve in your iced tea?
A. Breaking it up increases the surface area and thus increases the solubility.
B. Breaking it up increases the surface area and speeds up the dissolving process.
C. Breaking it up without also stirring has no effect on the dissolving process.
D. Unless you also heat the iced tea, breaking up the sugar cube has no effect on the dissolving process.

8.  Why must divers consider gas solubility?
A. The cold temperatures they encounter on their dives can dangerously increase dissolved gases in their bodies.
B. The extreme pressure they encounter on their dives can dangerously decrease the dissolved gases in their bodies.
C. If they surface too quickly, gas solubility decreases dangerously fast, causing bubbles to form in their blood.
D. Divers can't breathe if their blood dissolves too much air during dives.

9.  A spoonful of salt is stirred into a glass of ice water in a laboratory experiment.  Which of the following conclusions is valid?
A. Stirring results in the salt dissolving more quickly than it would otherwise.
B. Stirring causes less salt to dissolve in the ice water than would dissolve otherwise.
C. Stirring causes more salt to dissolve in the ice water than would dissolve otherwise.
D. Stirring does not alter the rate at which the salt dissolves or the amount of salt that can dissolve.

10.  Suppose you need water that contains more oxygen than usual.  You plan on bubbling air, which contains oxygen, into the water.  What would you do to increase the amount of oxygen that will dissolve in the water?
A. Decrease the pressure on the system.
B. Decrease the temperature of the water.
C. Make the water molecules more polar.
D. Stir the water.

11.  When oil and water are shaken together, they might appear mixed for a time but soon separate into layers.  Oil and water are not soluble in each other, so they are said to be immiscible.  Which of the following factors is the reason oil and water are immiscible?
A. The temperature is too low.
B. No catalyst is added.
C. They were shaken but not consistently stirred.
D. Oil is nonpolar, and water is polar.

12.  How does temperature affect solubility?
A. A rise in temperature always increases solubility.
B. A rise in temperature always decreases solubility.
C. Gas solubility decreases with higher temperatures, while the solubility of solids usually increases.
D. Temperature does not affect solubility in any consistent way.

Grade exam.