Chem 1010 - General Chemistry 1 » Summer 2021 » Exam 3
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Question #1
Choose the substance with the highest boiling point.
A.
HF
B.
CS2
C.
KI
D.
I2
E.
CH4
Question #2
Why is water an extraordinary substance?
A.
Water has an exceptionally high specific heat capacity.
B.
Water has strong hydrogen bonding.
C.
Water is the main solvent within living organisms.
D.
Water is the main solvent within living organisms, it has an exceptionally high specific heat capacity, it has strong hydrogen bonding and it has a low molar mass, yet it is a liquid at room temperature.
E.
Water has a low molar mass, yet it is a liquid at room temperature.
Question #3
Determine ΔH vap for a compound that has a measured vapor pressure of 24.3 torr at 273 K and 135 torr at 325 K.
A.
24 kJ/mol
B.
41 kJ/mol
C.
13 kJ/mol
D.
79 kJ/mol
E.
34 kJ/mol
Question #4
A solution is formed at room temperature by vigorously dissolving enough of the solid solute so that some solid remains at the bottom of the solution. Which statement below is TRUE?
A.
The solution is considered saturated.
B.
The solution would be considered unsaturated if it were cooled a bit to increase the solubility of the solid.
C.
The solution is considered unsaturated.
D.
The solution is considered supersaturated.
E.
None of the above are true.
Question #5
A solution is prepared by dissolving 7.00 g of glycerin (C 3H 8O 3) in 201 g of ethanol The freezing point of the solution is ________°C. The freezing point of pure ethanol is -114.6oC at 1 atm. The molal-freezing-point-depression constant (K f) for ethanol is 1.990C/m . The molar masses of glycerin and of ethanol are 92.1 g/mol and 46.1 g/mol, respectively.
A.
-107.9
B.
-115.4
C.
-113.8
D.
0.752
E.
-121.3
Question #6
Calculate the freezing point of a solution of 500.0 g of ethylene glycol (C 2H 6O 2) dissolved in 500.0 g of water. K f = 1.86°C/m and K b = 0.512°C/m.
A.
-8.32°C
B.
8.32°C
C.
-30.0°C
D.
30.0°C
E.
70.2°C
Question #7
What pressure would a gas mixture in a 10.0 L tank exert if it were composed of 48.5 g He and 94.6 g CO 2 at 398 K?
A.
7.02 atm
B.
39.6 atm
C.
58.7 atm
D.
32.6 atm
E.
46.6 atm
Question #8
Which statement is TRUE about kinetic molecular theory?
A.
The average kinetic energy of a particle is not proportional to the temperature.
B.
The collisions of particles with one another is completely elastic.
C.
A single particle does not move in a straight line.
D.
The size of the particle is large compared to the volume.
Question #9
Determine the [OH ] concentration in a 0.169 M Ca(OH) 2 solution.
A.
0.169 M
B.
5.92 × 10-14 M
C.
0.338 M
D.
2.96 × 10-14 M
E.
0.298 M
Question #10
The pH of an aqueous solution at 25.0°C is 10.66. What is the molarity of H + in this solution?
A.
4.6 × 1010
B.
2.2 × 10-11
C.
3.3
D.
1.1 × 10-13
E.
4.6 × 10-4
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