Solutions and Solubility Answers

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Under which conditions would the solubility of a gas be greatest?

A
high pressure and high temperature
B
high pressure and low temperature
C
low pressure and high temperature
D
low pressure and low temperature
5

Which is true about the dissolving process in water?

A
Nonpolar solutes dissolve easily in water.
B
Solute molecules surround water molecules.
C
Molecules or ions of a solute spread throughout the water molecules.
D
Water molecules are repelled by solute ions at the surface of the solute.
7

A student was comparing the solubility of equal amounts of table salt and table sugar at different temperatures.The table below shows the four samples that the student used and the temperature of the water that they were dissolved in.SampleNameChemical formulaTemperature of water (°C)1Table sugarC12H22O11 802Table sugarC12H22O11 453Table salt NaCl 554Table saltNaCl 63Which of the samples most likely had the highest solubility?

A
1
B
2
C
3
D
4
9

Under which conditions will sugar most likely dissolve fastest in a cup of water?

A
a sugar cube with stirring at 5°C
B
a sugar cube without stirring at 15°C
C
sugar crystals with stirring at 15°C
D
sugar crystals without stirring at 5°C
10

Which is the second step in the dissolving process?

A
The solute is mixed with the solvent.
B
The solute ions are carried into the solution.
C
The solvent molecules surround the solute particles.
D
The solvent molecules are attracted to solute particles or ions.
11

Which is true about the dissolving process in water?

A
Nonpolar solutes dissolve easily in water.
B
Solute molecules surround water molecules.
C
Molecules or ions of a solute spread throughout the water molecules.
D
Water molecules are repelled by solute ions at the surface of the solute.
12

A chemist dissolved crystals of an unknown substance into water at room temperature. He found that 33 g of the substance can be dissolved into 100 mL of water. What property of the unknown substance was the chemist most likely investigating?

A
its solubility
B
its rate of dissolution
C
its chemical reaction to water
D
its reaction to temperature changes
13

Which factor increases the rate of dissolution in an unsaturated solution?

A
increasing the temperature
B
decreasing the surface area
C
decreasing the amount of solute
D
increasing the amount of solvent
14

A chemist has dissolved a certain substance in water. The chemist knows that more of the substance could be dissolved into the water before it stops dissolving. Therefore, the current solution is

A
unsaturated
B
saturated
C
supersaturated
15

The graph below shows how solubility changes with temperature.What is the solubility of Na2HAsO4 at 60°C?

Question illustration
A
20 g/100 mL of water
B
46 g/100 mL of water
C
65 g/100 mL of water
D
70 g/100 mL of water
16

The graph below shows how solubility changes with temperature.Which two solutions have similar solubilities at 40°C?

Question illustration
A
Na2SO4 and NaCl
B
Na2HAsO4 and NaCl
C
Na2HAsO4 and Na2SO4
D
Ba(NO3)2 and Ce2(SO4)3 • 9H2O
17

The concentration of a solute in a solution is greater than the maximum concentration that is predicted from the solute's solubility. What is the best way to describe this solution?

A
diluted
B
saturated
C
unsaturated
D
supersaturated
18

A 1-L soda bottle contains dissolved carbon dioxide gas. Which bottle would have the highest concentration of dissolved gas?

A
a bottle that is sealed
B
a bottle that was opened 1 minute ago
C
a bottle that was opened 1 hour ago
D
a bottle that was opened 1 day ago
19

Which method would increase the solubility of a gas?

A
increasing the pressure
B
stirring the solvent quickly
C
increasing the temperature
D
decreasing the amount of solvent

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