Quiz Submissions - \[03\] Exam 3
Diana Behari (username: JM1200101)
Attempt 1
Written: Jan 3, 2019 12:17 AM - Jan 3, 2019 12:37 AM
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[02] Exam 3
Question 1 5 / 5 points
A glass of iced tea containing excess sugar at the bottom is said to be:
Question options:
homogeneous.
supersaturated.
saturated.
unsaturated.
Question 2 5 / 5 points
Which of the following would increase the solubility of a gas in a liquid?
Question options:
increasing the pressure of the gas above the solution
increasing the temperature of the solvent
adding more solvent
stirring the solution
Question 3 5 / 5 points
The rate at which a solute dissolves in a given solvent is determined by:
Question options:
the extent to which the solution is agitated.
the temperature of the solution.
the size of the solute particles.
all of the above
Question 4 5 / 5 points
If salt is dissolved in water, water serves as the:
Question options:
solute.
solvent.
dissolved medium.
none of the above
Question 5 5 / 5 points
Water samples containing dissolved substances are called _____ solutions.
Question options:
anhydrous
solvent
elementary
aqueous
Question 6 5 / 5 points
How many moles of solute are present in 1.25 L of a 0.75M NaNO3 solution?
Question options:
0.60 mol
1.7 mol
0.75 mol
0.94 mol
Question 7 0 / 5 points
The addition of antifreeze to water in a car radiator causes the freezing point of the mixture to:
Question options:
vary unpredictably.
decrease.
remain the same.
increase.
Question 8 5 / 5 points
Another name for drying agents is ___.
Question options:
effloresce
solvent
anhydrous
desiccant
Question 9 5 / 5 points
When a solute dissolves, the process is referred to as _____.
Question options:
solvent
solubility
solute
solvation
Question 10 5 / 5 points
The molarity of a solution that contains 14 g KOH per 150 mL of solution is:
Question options:
1.7M.
0.093M.
93M.
11M.
Question 11 5 / 5 points
What is the percent (m/m) of a solution containing 25 g of NaCl in 175 g of solution?
Question options:
0.14%
700%
14%
7.0%
Question 12 5 / 5 points
Which of the following changes will likely increase the solubility of a solid solute but decrease the solubility of a gaseous solute?
Question options:
Increasing the temperature
Decreasing the atmospheric pressure
Decreasing the concentration
Increasing the molecular mass of the solute
Question 13 0 / 5 points
If the solubility of a gas in water is 1.22 g/L at 2.75 atm, what is its solubility (in g/L) at 1.0 atm?
Question options:
3.36 g/L
3.97 g/L
2.25 g/L
0.44 g/L
Question 14 5 / 5 points
The electrolyte among the following is:
Question options:
KCl.
Mg(NO<sub>3</sub>)<sub>2</sub>.
NH<sub>4</sub>OH.
all of the above
Question 15 5 / 5 points
What is the percent by mass of water in MgSO4 • 7H2O?
Question options:
56.0%
51.1%
21.0%
195%
Question 16 5 / 5 points
Which of the following would be expected to dissolve readily in the nonpolar solvent CCl4?
Question options:
table salt
KNO3
Ca(OH)2
grease
Question 17 5 / 5 points
Which of the following would be expected to dissolve very readily in water?
Question options:
NaOH
CH4
H2
CBr4
Question 18 5 / 5 points
Which of the following is true about hygroscopic substances?
Question options:
They have low vapor pressures.
They remove moisture from the air.
They can be used as drying agents.
all of the above
Question 19 5 / 5 points
If the solubility of AgNO3 at 40°C is 311 g per 100 g of water, what mass of this solute can be dissolved in 350 g of water at the same temperature?
Question options:
1100 g
0.89 g
110 000 g
1.1 g
Question 20 0 / 5 points
Which of the following results from the presence of a solute in a given solvent?
Question options:
The vapor pressure of the solution is lower than that of the pure solvent.
The boiling point of the solution is lower than that of the pure solvent.
The freezing point of the solution is higher than that of the pure solvent.
all of the above