Question 1

A 0.100 m K2SO4 solution has a freezing point of -0.43 °\degree° C. What is the van't Hoff factor for this solution? Kf = 1.86 °\degree° C/m

Accepted Answer

A)   0.77
B)   1.0
C)   2.3
D)   3.0
E)   >3.0 F) A) and C)
G) A) and E)

Question 2

Two aqueous solutions are prepared: 2.0 m Cu(NO3) 2 and 2.0 m NaBr. Which of the following statements is true?

Accepted Answer

A)   The Cu(NO3) 2 solution has a higher vapor pressure and lower freezing point than the NaBr solution.
B)   The Cu(NO3) 2 solution has a higher vapor pressure and higher freezing point than the NaBr solution.
C)   The Cu(NO3) 2 solution has a lower vapor pressure and lower freezing point than the NaBr solution.
D)   The Cu(NO3) 2 solution has a lower vapor pressure and higher freezing point than the NaBr solution.
E)   None of these choices is correct.F) A) and D)
G) C) and D)

Question 3

Colloidal particles may be either solids, liquids or gases.

Accepted Answer

A) True 
 B)False

Question 4

Benzaldehyde (? = 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 °\degree° C/m, freezing point of pure ethanol = -117.3 °\degree° C.

Accepted Answer

A)   -117.5 °\degree° C
B)   -118.7 °\degree° C
C)   -119.0 °\degree° C
D)   -120.6 °\degree° C
E)   °\degree° C F) C) and D)
G) None of the above

Question 5

The most abundant molecules in the cell membranes of most species are

Accepted Answer

A)   proteins.
B)   sugars.
C)   phospholipids.
D)   fatty acids.
E)   steroids.F) A) and B)
G) B) and D)

Question 6

Methane has a Henry's Law constant (k)  of 9.88 * 102 mol/(L·atm)  when dissolved in benzene at 25 °\degree° C. How many grams of CH4 will dissolve in 3.00 L of benzene if the partial pressure of CH4 is 1.48 atm?

Accepted Answer

A)   0.0667 g
B)   0.146 g
C)   2.34 g
D)   4.83 g
E)   7.02 g F) All of the above
G) A) and D)

Question 7

What is the molality of a solution prepared by dissolving 86.9 g of diethyl ether, C4H10O, in 425 g of benzene, C6H6?

Accepted Answer

A)   0.362 m
B)   0.498 m
C)   2.01 m
D)   2.76 m
E)   None of these choices is correct.F) B) and E)
G) B) and D)

Question 8

Which of the following ions will be expected to have the most negative heat of hydration, ∆Hhydr?

Accepted Answer

A)   Na+
B)   Cs+
C)   Ca2+
D)   F¯
E)   I¯F) A) and E)
G) None of the above

Question 9

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 C)
G) A) and D)

Question 10

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 D)

Question 11

Which of the following pairs of ions is arranged so that the ion with the smaller charge density is listed first?

Accepted Answer

A)   K+, Rb+
B)   Cl¯, K+
C)   Cl¯, Br¯
D)   Ca2+, Ba2+
E)   None of these pairs are arranged in this way.F) A) and E)
G) A) and C)

Question 12

What concentration of aqueous FeCl3 would have the same osmotic pressure as a 0.20 M solution of CaCl2 at the same temperature, assuming ideal behavior?

Accepted Answer

A)   0.60 M
B)   0.40 M
C)   0.30 M
D)   0.15 M
E)   0.10 MF) All of the above
G) B) and E)

Question 13

Sodium hydroxide is a common ingredient in drain cleaners such as Drano. The mole fraction of sodium hydroxide in a saturated aqueous solution is 0.310. What is the molality of the solution?

Accepted Answer

A)   0.310 m
B)   0.690 m
C)   1.24 m
D)   12.4 m
E)   25.0 mF) A) and D)
G) None of the above

Question 14

Which one of the following pairs of dispersed phases and dispersing media can never form a colloid?

Accepted Answer

A)   solid and gas
B)   liquid and gas
C)   solid and solid
D)   liquid and liquid
E)   gas and gasF) B) and C)
G) B) and E)

Question 15

Diethyl ether has a vapor pressure of 400.0 torr at 18 °\degree° 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 is correct. F) D) and E)
G) C) and E)

Question 16

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 pairs are arranged in this way.F) D) and E)
G) C) and D)

Question 17

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 E)

Question 18

The chemist, Anna Lytic, must prepare 1.00 kg of 15.0% (w/w)  acetic acid using a stock solution which is 36.0% (w/w)  acetic acid (d = 1.045 g/mL) . Which of the following combinations will give her the solution she wants?

Accepted Answer

A)   417 mL of 36% acetic acid in 583 mL of distilled water
B)   417 g of 36% acetic acid in 583 g of distilled water
C)   360 mL of 36% acetic acid in 640 mL of distilled water
D)   360 g of 36% acetic acid in 640 g of distilled water
E)   150 g of 36% acetic acid in 850 g of distilled waterF) C) and E)
G) A) and B)

Question 19

In general, water is a good solvent for both polar and non-polar compounds.

Accepted Answer

A) True 
 B)False

Question 20

The larger the ion, the greater in magnitude will be its heat of hydration.

Accepted Answer

A) True 
 B)False

Exam 13: The Properties of Mixtures: Solutions and Colloids

Which of the following ions will be expected to have the most negative heat of hydration, ∆H_hydr?

Correct Answer
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Methane has a Henry's Law constant (k) of 9.88 * 10² mol/(L·atm) when dissolved in benzene at 25 $\degree$ C. How many grams of CH₄ will dissolve in 3.00 L of benzene if the partial pressure of CH₄ is 1.48 atm?

Correct Answer
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What is the molality of a solution prepared by dissolving 86.9 g of diethyl ether, C₄H₁₀O, in 425 g of benzene, C₆H₆?

Correct Answer
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Which of the following pairs of ions is arranged so that the ion with the smaller charge density is listed first?

Correct Answer
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Correct Answer
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The larger the ion, the greater in magnitude will be its heat of hydration.

Correct Answer
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Which one of the following pairs of dispersed phases and dispersing media can never form a colloid?

Correct Answer
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What concentration of aqueous FeCl₃ would have the same osmotic pressure as a 0.20 M solution of CaCl₂ at the same temperature, assuming ideal behavior?

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

Correct Answer
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The most abundant molecules in the cell membranes of most species are

Correct Answer
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Diethyl ether has a vapor pressure of 400.0 torr at 18 $\degree$ 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

Sodium hydroxide is a common ingredient in drain cleaners such as Drano. The mole fraction of sodium hydroxide in a saturated aqueous solution is 0.310. What is the molality of the solution?

Correct Answer
verified

Colloidal particles may be either solids, liquids or gases.

Correct Answer
verified

The chemist, Anna Lytic, must prepare 1.00 kg of 15.0% (w/w) acetic acid using a stock solution which is 36.0% (w/w) acetic acid (d = 1.045 g/mL) . Which of the following combinations will give her the solution she wants?

Correct Answer
verified

In general, water is a good solvent for both polar and non-polar compounds.

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

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

A 0.100 m K₂SO₄ solution has a freezing point of -0.43 $\degree$ C. What is the van't Hoff factor for this solution? K_f = 1.86 $\degree$ C/m

Correct Answer
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If a solute dissolves in an endothermic process

Correct Answer
verified

Two aqueous solutions are prepared: 2.0 m Cu(NO₃) ₂ and 2.0 m NaBr. Which of the following statements is true?

Correct Answer
verified

Exam 13: The Properties of Mixtures: Solutions and Colloids

Which of the following ions will be expected to have the most negative heat of hydration, ∆Hhydr?

Correct AnswerverifiedShow Answer

Methane has a Henry's Law constant (k) of 9.88 * 102 mol/(L·atm) when dissolved in benzene at 25 °\degree° C. How many grams of CH4 will dissolve in 3.00 L of benzene if the partial pressure of CH4 is 1.48 atm?

Correct AnswerverifiedShow Answer

What is the molality of a solution prepared by dissolving 86.9 g of diethyl ether, C4H10O, in 425 g of benzene, C6H6?

Correct AnswerverifiedShow Answer

Which of the following pairs of ions is arranged so that the ion with the smaller charge density is listed first?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The larger the ion, the greater in magnitude will be its heat of hydration.

Correct AnswerverifiedShow Answer

Which one of the following pairs of dispersed phases and dispersing media can never form a colloid?

Correct AnswerverifiedShow Answer

What concentration of aqueous FeCl3 would have the same osmotic pressure as a 0.20 M solution of CaCl2 at the same temperature, assuming ideal behavior?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The most abundant molecules in the cell membranes of most species are

Correct AnswerverifiedShow Answer

Diethyl ether has a vapor pressure of 400.0 torr at 18 °\degree° 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

Sodium hydroxide is a common ingredient in drain cleaners such as Drano. The mole fraction of sodium hydroxide in a saturated aqueous solution is 0.310. What is the molality of the solution?

Correct AnswerverifiedShow Answer

Colloidal particles may be either solids, liquids or gases.

Correct AnswerverifiedShow Answer

The chemist, Anna Lytic, must prepare 1.00 kg of 15.0% (w/w) acetic acid using a stock solution which is 36.0% (w/w) acetic acid (d = 1.045 g/mL) . Which of the following combinations will give her the solution she wants?

Correct AnswerverifiedShow Answer

In general, water is a good solvent for both polar and non-polar compounds.

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

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

A 0.100 m K2SO4 solution has a freezing point of -0.43 °\degree° C. What is the van't Hoff factor for this solution? Kf = 1.86 °\degree° C/m

Correct AnswerverifiedShow Answer

If a solute dissolves in an endothermic process

Correct AnswerverifiedShow Answer

Two aqueous solutions are prepared: 2.0 m Cu(NO3) 2 and 2.0 m NaBr. Which of the following statements is true?

Correct AnswerverifiedShow Answer

Which of the following ions will be expected to have the most negative heat of hydration, ∆H_hydr?

Correct Answer
verified

Methane has a Henry's Law constant (k) of 9.88 * 10² mol/(L·atm) when dissolved in benzene at 25 $\degree$ C. How many grams of CH₄ will dissolve in 3.00 L of benzene if the partial pressure of CH₄ is 1.48 atm?

Correct Answer
verified

What is the molality of a solution prepared by dissolving 86.9 g of diethyl ether, C₄H₁₀O, in 425 g of benzene, C₆H₆?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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What concentration of aqueous FeCl₃ would have the same osmotic pressure as a 0.20 M solution of CaCl₂ at the same temperature, assuming ideal behavior?

Correct Answer
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Correct Answer
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Correct Answer
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Diethyl ether has a vapor pressure of 400.0 torr at 18 $\degree$ 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
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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A 0.100 m K₂SO₄ solution has a freezing point of -0.43 $\degree$ C. What is the van't Hoff factor for this solution? K_f = 1.86 $\degree$ C/m

Correct Answer
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Correct Answer
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Two aqueous solutions are prepared: 2.0 m Cu(NO₃) ₂ and 2.0 m NaBr. Which of the following statements is true?

Correct Answer
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