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 _______________________.
answer
unsaturated
question
Under which conditions will sugar most likely dissolve fastest in a cup of water?
a sugar cube with stirring at 5°C
a sugar cube without stirring at 15°C
sugar crystals with stirring at 15°C
sugar crystals without stirring at 5°C
answer
C.
question
The graph below shows how solubility changes with temperature.
mc022-1.jpg
What is the solubility of Na2HAsO4 at 60°C?
20 g/100 mL of water
46 g/100 mL of water
65 g/100 mL of water
70 g/100 mL of water
answer
C. 65 g/100 mL of water
question
Under which conditions would the solubility of a gas be greatest?
high pressure and high temperature
high pressure and low temperature
low pressure and high temperature
low pressure and low temperature
answer
B. high pressure and low temperature
question
A 1-L soda bottle contains dissolved carbon dioxide gas. Which bottle would have the highest concentration of dissolved gas?
a bottle that is sealed
a bottle that was opened 1 minute ago
a bottle that was opened 1 hour ago
a bottle that was opened 1 day ago
answer
A. a bottle that is sealed
question
Which method would increase the solubility of a gas?
increasing the pressure
stirring the solvent quickly
increasing the temperature
decreasing the amount of solvent
answer
A. increasing the pressure
question
Which is true about the dissolving process in water?
Nonpolar solutes dissolve easily in water.
Solute molecules surround water molecules.
Molecules or ions of a solute spread throughout the water molecules.
Water molecules are repelled by solute ions at the surface of the solute.
answer
C. Molecules or ions of a solute spread throughout the water molecules.
question
Solute crystals are added to a solution until they begin to sink to the bottom of their container. The solution is then heated, and many more solute crystals dissolve. Which term best describes the solution immediately after it was heated?
saturated
unsaturated
concentrated
supersaturated
answer
B. Unsaturated
question
Which refers to the amount of a solute that will dissolve in a given volume of solvent at a given temperature and pressure?
solubility
supersaturated
dissolution rate
concentrated
answer
A. Solubility
question
A beaker contains a solution. A single solute crystal is added to the solution. Immediately, crystals form in the solution.
Which term best describes the solution before the crystal was added?
supersaturated
unsaturated
diluted
saturated
answer
A. Supersaturated
question
Which is the second step in the dissolving process?
The solute is mixed with the solvent.
The solute ions are carried into the solution.
The solvent molecules surround the solute particles.
The solvent molecules are attracted to the surface of the solute particles.
answer
C.
question
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?
diluted
saturated
unsaturated
supersaturated
answer
D.
question
The graph below shows how solubility changes with temperature.
mc026-1.jpg
Which two solutions have similar solubilities at 40°C?
Na2SO4 and NaCl
Na2HAsO4 and NaCl
Na2HAsO4 and Na2SO4
Ba(NO3)2 and Ce2(SO4)3 • 9H2O
answer
C.
question
Which factor increases the rate of dissolution in an unsaturated solution?
increasing the temperature
decreasing the surface area
decreasing the amount of solute
increasing the amount of solvent
answer
A.
question
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?
its solubility
its rate of dissolution
its chemical reaction to water
its reaction to temperature changes
answer
A.
question
Which is true about dissolving a polar substance in water?
The solvent particles are all nonpolar molecules.
The solute particles are carried into the solution.
The solute particles have no attraction for the solvent molecules.
The solute particles are very different from the solvent molecules.
answer
B.
question
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.
Sample
Name
Chemical formula
Temperature of water (°C)
1
Table sugar
C12H22O11
80
2
Table sugar
C12H22O11
45
3
Table salt
NaCl
55
4
Table salt
NaCl
63
Which of the samples most likely had the highest solubility?
1
2
3
4
answer
A.
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