Chem 1010 - General Chemistry 1 » Summer 2021 » Exam 3 (A)

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Question #1
When dissolved in water, which compound is generally considered to be an Arrhenius acid?
A.   NaOH
B.   CH3CO2H
C.   Na2CO3
D.   CH3CH2OH
Question #2
Which of the following statements is FALSE?
A.   Molecules with hydrogen bonding are more volatile than compounds with dipole-dipole forces.
B.   The rate of vaporization increases with increasing surface area.
C.   The rate of vaporization increases with decreasing strength of intermolecular forces.
D.   The rate of vaporization increases with increasing temperature.
E.   None of the above are false.
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.   34 kJ/mol
B.   79 kJ/mol
C.   41 kJ/mol
D.   24 kJ/mol
E.   13 kJ/mol
Question #4
Determine the vapor pressure (in torr) of a substance at 36°C, whose normal boiling point is 84°C and has a ΔH vap of 22.1 kJ/mol.
A.   31.8 torr
B.   41.8 torr
C.   147 torr
D.   239 torr
E.   98 torr
Question #5
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.   46.6 atm
C.   39.6 atm
D.   58.7 atm
E.   32.6 atm
Question #6
A gas mixture contains CO, Ar and H 2. What is the total pressure of the mixture, if the mole fraction of H 2 is 0.35 and the pressure of H 2 is 0.58 atm?
A.   1.7 atm
B.   0.49 atm
C.   0.60 atm
D.   0.20 atm
E.   2.1 atm
Question #7
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.   30.0°C
C.   8.32°C
D.   -30.0°C
E.   70.2°C
Question #8
To make a 0.500 M solution, one could take 0.500 moles of solute and add
A.   enough solvent to make 1.00 L of solution.
B.   enough solvent to make 1.00 kg of solution.
C.   1.00 L of solvent.
D.   1.00 kg of solvent.
Question #9
Identify the colligative property.
A.   boiling point elevation
B.   vapor pressure lowering, osmotic pressure, freezing point depression, and boiling point elevation
C.   vapor pressure lowering
D.   freezing point depression
E.   osmotic pressure

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