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CHEM 102L FINAL EXAM REVIEW 2026-WELL
REVISED ASSESSMENT EXAM WITH VERIFIED
ANSWERS
True or False. As molecules escape from the liquid to the vapor phase, the average
kinetic energy of the solution is lower and the temperature of the solution is
higher than the original solution. - correct-answer -false
If molecule A has an enthalpy of vaporization, ∆Hvap, that is larger than molecule
B, what does this imply about the intermolecular forces of molecule A relative to
molecule B?
a. Higher
b. Lower
c. Equal
d. Not enough information to determine - correct-answer -a
Based on the graph below, what is the ∆Hvap of the liquid being studied?
a. 40.8 kJ/mol
b. -40.8 kJ/mol
c. 59,800 kJ/mol
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d. -4910.1 kJ/mol
e. 49010 kJ/mol - correct-answer -a
Liquids with __________ intermolecular forces have a ________ enthalpy of
vaporization, and the molecules escape into the vapor phase _________.
a. Stronger, larger, with difficulty
b. Stronger, smaller, easily
c. Weaker, larger, easily
d. Weaker, smaller, with difficulty - correct-answer -a
For several molecules with the same chemical formula, how does the degree of
branching influence the relative intermolecular forces? Why? - correct-answer -IM
forces based on surface area
> branching = < surface area = < IM forces
*Experiment 13: Colligative Properties* - correct-answer -
Define molality. What are its units? - correct-answer -mol of solute/kg of solvent
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Which of the following is not a colligative property?
a. Osmotic Pressure
b. Freezing Point Depression
c. Boiling Point Elevation
d. UV/Visible Absorption
e. Vapor Pressure Reduction - correct-answer -d
Which of the following salts would cause the largest freezing point depression in
water (Kf= 1.86°C/m)?
a. 0.6 m LiCl
b. 0.5 m Mg(Cl)2
c. 0.4 m Cu(Cl)2
d. 1.2 m acetone - correct-answer -d
In this experiment, how did you prevent super cooling? Why is super cooling
problematic? - correct-answer -insulation jacket; cools to quickly (crystallize w/
seed crystal)
CHEM 102L FINAL EXAM REVIEW 2026-WELL
REVISED ASSESSMENT EXAM WITH VERIFIED
ANSWERS
True or False. As molecules escape from the liquid to the vapor phase, the average
kinetic energy of the solution is lower and the temperature of the solution is
higher than the original solution. - correct-answer -false
If molecule A has an enthalpy of vaporization, ∆Hvap, that is larger than molecule
B, what does this imply about the intermolecular forces of molecule A relative to
molecule B?
a. Higher
b. Lower
c. Equal
d. Not enough information to determine - correct-answer -a
Based on the graph below, what is the ∆Hvap of the liquid being studied?
a. 40.8 kJ/mol
b. -40.8 kJ/mol
c. 59,800 kJ/mol
,2|Page
d. -4910.1 kJ/mol
e. 49010 kJ/mol - correct-answer -a
Liquids with __________ intermolecular forces have a ________ enthalpy of
vaporization, and the molecules escape into the vapor phase _________.
a. Stronger, larger, with difficulty
b. Stronger, smaller, easily
c. Weaker, larger, easily
d. Weaker, smaller, with difficulty - correct-answer -a
For several molecules with the same chemical formula, how does the degree of
branching influence the relative intermolecular forces? Why? - correct-answer -IM
forces based on surface area
> branching = < surface area = < IM forces
*Experiment 13: Colligative Properties* - correct-answer -
Define molality. What are its units? - correct-answer -mol of solute/kg of solvent
, 3|Page
Which of the following is not a colligative property?
a. Osmotic Pressure
b. Freezing Point Depression
c. Boiling Point Elevation
d. UV/Visible Absorption
e. Vapor Pressure Reduction - correct-answer -d
Which of the following salts would cause the largest freezing point depression in
water (Kf= 1.86°C/m)?
a. 0.6 m LiCl
b. 0.5 m Mg(Cl)2
c. 0.4 m Cu(Cl)2
d. 1.2 m acetone - correct-answer -d
In this experiment, how did you prevent super cooling? Why is super cooling
problematic? - correct-answer -insulation jacket; cools to quickly (crystallize w/
seed crystal)
