Chem 131 Exam 1 ACTUAL QUESTIONS
AND CORRECT ANSWERS
Which statement about hydrogen bonding is true?
A) hydrogen bonding is the intermolecular attractive forces between two hydrogen atoms in solution
B) the hydrogen bonding capabilities of water molecules cause ch3ch2ch2ch3 to be more soluble in
water than ch3oh
C) hydrogen bonding of solvent molecules with a solute will not affect the solubility of the solute
D) hydrogen bonding interactions between molecules are stronger than the covalent bonds within the
molecule
E) hydrogen bonding arises from the dipole moment created by the unequal sharing of electrons
within certain covalent bonds within a molecule - correct answer d) hydrogen bonding
interactions between molecules are stronger than the covalent bonds within the molecule
Describe the deviation with respect to raoult's law. Acetone and water.
A. Relatively ideal
B. Negative deviation
C. Positive deviation
D. More info
E. None of these - correct answer c. Positive deviation
All of the following are colligative properties except:
A. Density elevation
B. Boiling point elevation
C. Freezing point depression
, D. Osmotic pressure
E. None of these - correct answer a. Density elevation
A solute added to a solvent raises the boiling point of the solution because
A. The temp. To cause boiling must be great enough to boil not only the solvent but also the solute.
B. The solute particles lower the solvent's vapr pressure, thus requiring a higher temp. To cause
boiling.
C. The solute particles raise teh solvent's vapor pressure, thus requireing a higher temp to cause
boiling.
D. The solute increases the volume of the solution and an increase in volume requires an increase in
temp. To reach teh boiling point.
E. Two of these are correct - correct answer d. The solute increases the volume of the solution
and an increase in volume requires an increase in temp. To reach the boiling point.
The observed van't hoff factor for an electrolyte is less than the expected factor because of
A. Electrolytic repulsion
B. Ion pairing
C. Coagualtion
D. Complete dissociation
E. Gelation - correct answer b. Ion pairing
The most likely reason for colloidal dispersion is
A. The tyndall effect
B. Electrostatic repulsion
C. Precipitation
D. Emulsion formation
E. Coagualtion - correct answer a. Tyndall effect
Which of the following aqueous solutions will have the lowest vapor pressure
AND CORRECT ANSWERS
Which statement about hydrogen bonding is true?
A) hydrogen bonding is the intermolecular attractive forces between two hydrogen atoms in solution
B) the hydrogen bonding capabilities of water molecules cause ch3ch2ch2ch3 to be more soluble in
water than ch3oh
C) hydrogen bonding of solvent molecules with a solute will not affect the solubility of the solute
D) hydrogen bonding interactions between molecules are stronger than the covalent bonds within the
molecule
E) hydrogen bonding arises from the dipole moment created by the unequal sharing of electrons
within certain covalent bonds within a molecule - correct answer d) hydrogen bonding
interactions between molecules are stronger than the covalent bonds within the molecule
Describe the deviation with respect to raoult's law. Acetone and water.
A. Relatively ideal
B. Negative deviation
C. Positive deviation
D. More info
E. None of these - correct answer c. Positive deviation
All of the following are colligative properties except:
A. Density elevation
B. Boiling point elevation
C. Freezing point depression
, D. Osmotic pressure
E. None of these - correct answer a. Density elevation
A solute added to a solvent raises the boiling point of the solution because
A. The temp. To cause boiling must be great enough to boil not only the solvent but also the solute.
B. The solute particles lower the solvent's vapr pressure, thus requiring a higher temp. To cause
boiling.
C. The solute particles raise teh solvent's vapor pressure, thus requireing a higher temp to cause
boiling.
D. The solute increases the volume of the solution and an increase in volume requires an increase in
temp. To reach teh boiling point.
E. Two of these are correct - correct answer d. The solute increases the volume of the solution
and an increase in volume requires an increase in temp. To reach the boiling point.
The observed van't hoff factor for an electrolyte is less than the expected factor because of
A. Electrolytic repulsion
B. Ion pairing
C. Coagualtion
D. Complete dissociation
E. Gelation - correct answer b. Ion pairing
The most likely reason for colloidal dispersion is
A. The tyndall effect
B. Electrostatic repulsion
C. Precipitation
D. Emulsion formation
E. Coagualtion - correct answer a. Tyndall effect
Which of the following aqueous solutions will have the lowest vapor pressure
