Question 1

The solubility of gases in water increases with increase in the pressure of the gas.

Accepted Answer

A) True 
 B)False

Question 2

A solution of sucrose (sugar)  in water is in equilibrium with solid sucrose. If more solid sucrose is now added, with stirring,

Accepted Answer

A)   the concentration of the solution will increase.
B)   the concentration of the solution will decrease.
C)   the concentration of the solution will remain the same.
D)   the volume of solution will increase.
E)   a supersaturated solution will be produced.F) A) and D)
G) A) and C)

Question 3

Potassium fluoride is used for frosting glass. Calculate the molarity of a solution prepared by dissolving 78.6 g of KF in enough water to produce 225 mL of solution.

Accepted Answer

A)   0.304 M
B)   0.349 M
C)   1.35 M
D)   3.29 M
E)   6.01 MF) B) and E)
G) A) and B)

Question 4

Gases with high boiling points tend to be more soluble in water than ones with low boiling points.

Accepted Answer

A) True 
 B)False

Question 5

Colligative properties depend on

Accepted Answer

A)   the chemical properties of the solute.
B)   the chemical properties of the solvent.
C)   the masses of the individual ions.
D)   the molar mass of the solute.
E)   the number of particles dissolved.F) A) and C)
G) B) and D)

Question 6

Benzaldehyde ( f = 1.99°C/m, freezing point of pure ethanol = -117.3°C. A)  -117.5°C B)  -118.7°C C)  -119.0°C D)  -120.6°C E)   = 106.1 g/mol) , also known as oil of almonds, is used in the manufacture of dyes and perfumes and in flavorings. What would be the freezing point of a solution prepared by dissolving 75.00 g of benzaldehyde in 850.0 g of ethanol? Kf = 1.99°C/m, freezing point of pure ethanol = -117.3°C.

Accepted Answer

A)   -117.5°C
B)   -118.7°C
C)   -119.0°C
D)   -120.6°C
E)   < -121°CF) B) and C)
G) All of the above

Question 7

A solution of ethanol (C2H6O)  in water is sometimes used as a disinfectant. 1.00 L of this solution contains 553 g of ethanol and 335 g of water. What is the molality of the ethanol in this solution?

Accepted Answer

A)   0.392 m
B)   0.608 m
C)   13.5 m
D)   33.6 m
E)   35.8 mF) A) and C)
G) A) and B)

Question 8

Isoamyl salicylate (  = 208.25 g/mol)  has a pleasant aroma and is used in perfumes and soaps. Which of the following combinations gives a 0.75 m solution of isoamyl salicylate in ethyl alcohol (d = 0.7893 g/mL) ?

Accepted Answer

A)   117.2 g isoamyl salicylate in 950.0 mL of ethyl alcohol
B)   117.2 g isoamyl salicylate in 750.0 mL of ethyl alcohol
C)   117.2 g isoamyl salicylate in 750.0 mL of solution
D)   117.2 g isoamyl salicylate in 592.0 g of ethyl alcohol
E)   None of these choices are correct.F) D) and E)
G) B) and D)

Question 9

Children under the age of 6 with more than 0.10 ppm of lead in their blood can suffer a reduction in I.Q. or have behavior problems. What is the molality of a solution which contains 0.10 ppm of lead?

Accepted Answer

A)   4.8 × 10-10 m
B)   4.8 × 10-7 m
C)   4.8 × 10-4 m
D)   4.8 × 10-1 m
E)   None of these choices are correct.F) A) and D)
G) A) and C)

Question 10

Which of the following pairs of ions is arranged so that the ion with the larger (i.e., more negative)  heat of hydration is listed first?

Accepted Answer

A)   Br-, K+
B)   Mg2+, Sr 2+
C)   Ca2+, Sc3+
D)   Na+, Li+
E)   None of these choices are correct.F) All of the above
G) D) and E)

Question 11

Raoult's Law relates the vapor pressure of a solvent above a solution to the mole fraction of the solvent and the vapor pressure of the pure solvent.

Accepted Answer

A) True 
 B)False

Question 12

From the following list of aqueous solutions and water, select the one with the highest boiling point.

Accepted Answer

A)   1.0 m KNO3
B)   0.75 m NaCl
C)   0.75 m CuCl2
D)   2.0 m C12H22O11 (sucrose) 
E)   pure waterF) A) and B)
G) A) and C)

Question 13

Based only on the relative lattice energies of the compounds below, which one would be expected to have the lowest solubility in water?

Accepted Answer

A)   NaBr
B)   CaS
C)   NaOH
D)   KI
E)   CsClF) C) and E)
G) A) and B)

Question 14

Heats of hydration may be either positive or negative.

Accepted Answer

A) True 
 B)False

Question 15

If a solute dissolves in an endothermic process

Accepted Answer

A)   H bonds must exist between solvent and solute.
B)   strong ion-dipole forces must exist in the solution.
C)   the solute must be a gas.
D)   the entropy of the solution is immaterial.
E)   the entropy of the solution must be greater than that of its pure components.F) C) and D)
G) B) and C)

Question 16

Heats of solution may be either positive or negative.

Accepted Answer

A) True 
 B)False

Question 17

Calculate the vapor pressure of a solution prepared by dissolving 0.500 mol of a non-volatile solute in 275 g of hexane ( hexane = 400.0 torr at 49.6°C. A)  54 torr B)  154 torr C)  246 torr D)  346 torr E)  400. torr" class="answers-bank-image d-inline" rel="preload" > = 86.18 g/mol)  at 49.6°C. P°hexane = 400.0 torr at 49.6°C.

Accepted Answer

A)   54 torr
B)   154 torr
C)   246 torr
D)   346 torr
E)   400. torrF) A) and B)
G) A) and D)

Question 18

Select the weakest electrolyte from the following set.

Accepted Answer

A)   Na2 SO4
B)   KCl
C)   CH3 CH2 COOH, propionic acid
D)   CaCl2
E)   LiOHF) D) and E)
G) A) and D)

Question 19

Human blood has a molar concentration of solutes of 0.30 M. What is the osmotic pressure of blood at 25°C?

Accepted Answer

A)   0.012 atm
B)   0.62 atm
C)   6.8 atm
D)   7.3 atm
E)   >10. atmF) A) and E)
G) B) and D)

Question 20

Diethyl ether has a vapor pressure of 400.0 torr at 18°C. When a sample of benzoic acid is dissolved in ether, the vapor pressure of the solution is 342 torr. What is the mole fraction of benzoic acid in the solution?

Accepted Answer

A)   0.0169
B)   0.0197
C)   0.145
D)   0.855
E)   None of these choices are correct.F) C) and D)
G) A) and E)

Exam 13: The Properties of Mixtures Solutions and Colloids

Heats of hydration may be either positive or negative.

Correct Answer
verified

Potassium fluoride is used for frosting glass. Calculate the molarity of a solution prepared by dissolving 78.6 g of KF in enough water to produce 225 mL of solution.

Correct Answer
verified

Human blood has a molar concentration of solutes of 0.30 M. What is the osmotic pressure of blood at 25°C?

Correct Answer
verified

If a solute dissolves in an endothermic process

Correct Answer
verified

Based only on the relative lattice energies of the compounds below, which one would be expected to have the lowest solubility in water?

Correct Answer
verified

Heats of solution may be either positive or negative.

Correct Answer
verified

Gases with high boiling points tend to be more soluble in water than ones with low boiling points.

Correct Answer
verified

The solubility of gases in water increases with increase in the pressure of the gas.

Correct Answer
verified

Correct Answer
verified

Raoult's Law relates the vapor pressure of a solvent above a solution to the mole fraction of the solvent and the vapor pressure of the pure solvent.

Correct Answer
verified

Isoamyl salicylate ( = 208.25 g/mol) has a pleasant aroma and is used in perfumes and soaps. Which of the following combinations gives a 0.75 m solution of isoamyl salicylate in ethyl alcohol (d = 0.7893 g/mL) ?

Correct Answer
verified

Select the weakest electrolyte from the following set.

Correct Answer
verified

Which of the following pairs of ions is arranged so that the ion with the larger (i.e., more negative) heat of hydration is listed first?

Correct Answer
verified

Colligative properties depend on

Correct Answer
verified

A solution of ethanol (C₂H₆O) in water is sometimes used as a disinfectant. 1.00 L of this solution contains 553 g of ethanol and 335 g of water. What is the molality of the ethanol in this solution?

Correct Answer
verified

A solution of sucrose (sugar) in water is in equilibrium with solid sucrose. If more solid sucrose is now added, with stirring,

Correct Answer
verified

Diethyl ether has a vapor pressure of 400.0 torr at 18°C. When a sample of benzoic acid is dissolved in ether, the vapor pressure of the solution is 342 torr. What is the mole fraction of benzoic acid in the solution?

Correct Answer
verified

From the following list of aqueous solutions and water, select the one with the highest boiling point.

Correct Answer
verified

Children under the age of 6 with more than 0.10 ppm of lead in their blood can suffer a reduction in I.Q. or have behavior problems. What is the molality of a solution which contains 0.10 ppm of lead?

Correct Answer
verified

Calculate the vapor pressure of a solution prepared by dissolving 0.500 mol of a non-volatile solute in 275 g of hexane ( = 86.18 g/mol) at 49.6°C. P°_hexane = 400.0 torr at 49.6°C.

Correct Answer
verified

Exam 13: The Properties of Mixtures Solutions and Colloids

Heats of hydration may be either positive or negative.

Correct AnswerverifiedShow Answer

Potassium fluoride is used for frosting glass. Calculate the molarity of a solution prepared by dissolving 78.6 g of KF in enough water to produce 225 mL of solution.

Correct AnswerverifiedShow Answer

Human blood has a molar concentration of solutes of 0.30 M. What is the osmotic pressure of blood at 25°C?

Correct AnswerverifiedShow Answer

If a solute dissolves in an endothermic process

Correct AnswerverifiedShow Answer

Based only on the relative lattice energies of the compounds below, which one would be expected to have the lowest solubility in water?

Correct AnswerverifiedShow Answer

Heats of solution may be either positive or negative.

Correct AnswerverifiedShow Answer

Gases with high boiling points tend to be more soluble in water than ones with low boiling points.

Correct AnswerverifiedShow Answer

The solubility of gases in water increases with increase in the pressure of the gas.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Raoult's Law relates the vapor pressure of a solvent above a solution to the mole fraction of the solvent and the vapor pressure of the pure solvent.

Correct AnswerverifiedShow Answer

Isoamyl salicylate ( = 208.25 g/mol) has a pleasant aroma and is used in perfumes and soaps. Which of the following combinations gives a 0.75 m solution of isoamyl salicylate in ethyl alcohol (d = 0.7893 g/mL) ?

Correct AnswerverifiedShow Answer

Select the weakest electrolyte from the following set.

Correct AnswerverifiedShow Answer

Which of the following pairs of ions is arranged so that the ion with the larger (i.e., more negative) heat of hydration is listed first?

Correct AnswerverifiedShow Answer

Colligative properties depend on

Correct AnswerverifiedShow Answer

A solution of ethanol (C2H6O) in water is sometimes used as a disinfectant. 1.00 L of this solution contains 553 g of ethanol and 335 g of water. What is the molality of the ethanol in this solution?

Correct AnswerverifiedShow Answer

A solution of sucrose (sugar) in water is in equilibrium with solid sucrose. If more solid sucrose is now added, with stirring,

Correct AnswerverifiedShow Answer

Diethyl ether has a vapor pressure of 400.0 torr at 18°C. When a sample of benzoic acid is dissolved in ether, the vapor pressure of the solution is 342 torr. What is the mole fraction of benzoic acid in the solution?

Correct AnswerverifiedShow Answer

From the following list of aqueous solutions and water, select the one with the highest boiling point.

Correct AnswerverifiedShow Answer

Children under the age of 6 with more than 0.10 ppm of lead in their blood can suffer a reduction in I.Q. or have behavior problems. What is the molality of a solution which contains 0.10 ppm of lead?

Correct AnswerverifiedShow Answer

Calculate the vapor pressure of a solution prepared by dissolving 0.500 mol of a non-volatile solute in 275 g of hexane ( = 86.18 g/mol) at 49.6°C. P°hexane = 400.0 torr at 49.6°C.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A solution of ethanol (C₂H₆O) in water is sometimes used as a disinfectant. 1.00 L of this solution contains 553 g of ethanol and 335 g of water. What is the molality of the ethanol in this solution?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Calculate the vapor pressure of a solution prepared by dissolving 0.500 mol of a non-volatile solute in 275 g of hexane ( = 86.18 g/mol) at 49.6°C. P°_hexane = 400.0 torr at 49.6°C.

Correct Answer
verified