Question 1

Calculate the freezing point of a solution made by dissolving 3.50 g of potassium chloride (ℳ = 74.55 g/mol)  in 100.0 g of water. Assume ideal behavior for the solution; Kf = 1.86°C/m.

Accepted Answer

A)  −1.7°C
B)  −0.9°C
C)  0.0°C
D)  0.9°C
E)  1.7°CF) A) and B)
G) A) and C)

Question 2

The backbone of a protein chain consists of carbon, nitrogen, and oxygen atoms.

Accepted Answer

A) True 
 B)False

Question 3

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

Accepted Answer

A) True 
 B)False

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

A 2.0% (w/v)  solution of sodium hydrogen citrate, Na2C6H6O7, which also contains 2.5% (w/v)  of dextrose, C6H12O6, is used as an anticoagulant for blood which is to be used for transfusions. What is the molarity of the sodium hydrogen citrate in the solution?

Accepted Answer

A)  0.085 M
B)  0.19 M
C)  0.53 M
D)  1.2 M
E)  1.3 MF) B) and E)
G) A) and D)

Question 6

The heat of solution is the total enthalpy change when a solution is formed from the separated solute and solvent.

Accepted Answer

A) True 
 B)False

Question 7

Electrolyte solutions generally behave less ideally as the solute concentration increases.

Accepted Answer

A) True 
 B)False

Question 8

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) D) and E)
G) All of the above

Question 9

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(NO 3) 2 solution has a higher vapor pressure and lower freezing point than the NaBr solution.
B)  The Cu(NO 3) 2 solution has a higher vapor pressure and higher freezing point than the NaBr solution.
C)  The Cu(NO 3) 2 solution has a lower vapor pressure and lower freezing point than the NaBr solution.
D)  The Cu(NO 3) 2 solution has a lower vapor pressure and higher freezing point than the NaBr solution.
E)  None of these choices are correct.F) C) and E)
G) All of the above

Question 10

How many moles of sulfate ions are present in 1.0 L of 0.5 M Li2SO4?

Accepted Answer

A)  0.5 mol
B)  1.0 mol
C)  1.5 mol
D)  2.0 mol
E)  3.0 molF) A) and C)
G) C) and D)

Question 11

If the density of a solution is less than 1.0 g/mL, its molarity will be greater than its molality.

Accepted Answer

A) True 
 B)False

Question 12

Heats of hydration may be either positive or negative.

Accepted Answer

A) True 
 B)False

Question 13

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)  Ca 2+, Ba 2+
E)  None of these choices are correct.F) B) and D)
G) A) and B)

Question 14

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) B) and E)
G) B) and C)

Question 15

Which, if any, of the following features is common to soaps, detergents, phospholipids, and channel-forming antibiotics?

Accepted Answer

A)  They all contain fatty acids.
B)  They all contain phosphate groups.
C)  They all contain polypeptide chains.
D)  Their function depends on the dual polarity of their molecules.
E)  None of these choices are correct.F) B) and D)
G) A) and D)

Question 16

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 B)
G) All of the above

Question 17

For a given solution, which of the following concentration values will change as temperature changes?

Accepted Answer

A)  Mass percent
B)  Molality
C)  Mole fraction
D)  Molarity
E)  None of these choices are correct.F) D) and E)
G) All of the above

Question 18

Consider the expression below, showing the terms which contribute to the heat of solution, ΔHsoln: ΔHsoln = ΔHsolute + ΔHsolvent + ΔHmix
Which of the following sets correctly shows the signs (positive or negative)  of the three terms on the right hand side of the equation?

Accepted Answer

A)  Δ H solute > 0; Δ H solvent > 0; Δ H mix > 0
B)  Δ H solute solvent mix 
C)  Δ H solute > 0; Δ H solvent > 0; Δ H mix 
D)  Δ H solute solvent mix > 0
E)  Δ H solute solvent > 0; Δ H mix < 0F) A) and C)
G) B) and C)

Question 19

Isoamyl salicylate (ℳ = 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) B) and C)
G) C) and D)

Question 20

Dimethylglyoxime, DMG, is an organic compound used to test for aqueous nickel(II)  ions. A solution prepared by dissolving 65.0 g of DMG in 375 g of ethanol boils at 80.3°C. What is the molar mass of DMG? Kb = 1.22°C/m, boiling point of pure ethanol = 78.5°C

Accepted Answer

A)  44.1 g/mol
B)  65.8 g/mol
C)  117 g/mol
D)  131.6 g/mol
E)  553 g/molF) B) and E)
G) A) and E)

Exam 13: The Properties of Mixtures: Solutions and Colloids

Consider the expression below, showing the terms which contribute to the heat of solution, ΔHsoln: ΔHsoln = ΔHsolute + ΔHsolvent + ΔHmix Which of the following sets correctly shows the signs (positive or negative) of the three terms on the right hand side of the equation?

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

Dimethylglyoxime, DMG, is an organic compound used to test for aqueous nickel(II) ions. A solution prepared by dissolving 65.0 g of DMG in 375 g of ethanol boils at 80.3°C. What is the molar mass of DMG? Kb = 1.22°C/m, boiling point of pure ethanol = 78.5°C

Correct AnswerverifiedShow Answer

Which, if any, of the following features is common to soaps, detergents, phospholipids, and channel-forming antibiotics?

Correct AnswerverifiedShow Answer

The heat of solution is the total enthalpy change when a solution is formed from the separated solute and solvent.

Correct AnswerverifiedShow Answer

Calculate the freezing point of a solution made by dissolving 3.50 g of potassium chloride (ℳ = 74.55 g/mol) in 100.0 g of water. Assume ideal behavior for the solution; Kf = 1.86°C/m.

Correct AnswerverifiedShow Answer

For a given solution, which of the following concentration values will change as temperature changes?

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

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

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

Isoamyl salicylate (ℳ = 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

If the density of a solution is less than 1.0 g/mL, its molarity will be greater than its molality.

Correct AnswerverifiedShow Answer

Colligative properties depend on

Correct AnswerverifiedShow Answer

Electrolyte solutions generally behave less ideally as the solute concentration increases.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

How many moles of sulfate ions are present in 1.0 L of 0.5 M Li2SO4?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The backbone of a protein chain consists of carbon, nitrogen, and oxygen atoms.

Correct AnswerverifiedShow Answer

Heats of hydration may be either positive or negative.

Correct AnswerverifiedShow Answer

A 2.0% (w/v) solution of sodium hydrogen citrate, Na2C6H6O7, which also contains 2.5% (w/v) of dextrose, C6H12O6, is used as an anticoagulant for blood which is to be used for transfusions. What is the molarity of the sodium hydrogen citrate in the solution?

Correct AnswerverifiedShow Answer

Consider the expression below, showing the terms which contribute to the heat of solution, ΔH_soln: ΔH_soln = ΔH_solute + ΔH_solvent + ΔH_mix Which of the following sets correctly shows the signs (positive or negative) of the three terms on the right hand side of the equation?

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

Correct Answer
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Dimethylglyoxime, DMG, is an organic compound used to test for aqueous nickel(II) ions. A solution prepared by dissolving 65.0 g of DMG in 375 g of ethanol boils at 80.3°C. What is the molar mass of DMG? K_b = 1.22°C/m, boiling point of pure ethanol = 78.5°C

Correct Answer
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Correct Answer
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Correct Answer
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Calculate the freezing point of a solution made by dissolving 3.50 g of potassium chloride (ℳ = 74.55 g/mol) in 100.0 g of water. Assume ideal behavior for the solution; K_f = 1.86°C/m.

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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Correct Answer
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How many moles of sulfate ions are present in 1.0 L of 0.5 M Li₂SO₄?

Correct Answer
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Correct Answer
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Correct Answer
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A 2.0% (w/v) solution of sodium hydrogen citrate, Na₂C₆H₆O₇, which also contains 2.5% (w/v) of dextrose, C₆H₁₂O₆, is used as an anticoagulant for blood which is to be used for transfusions. What is the molarity of the sodium hydrogen citrate in the solution?

Correct Answer
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