Question 1

Potassium hydrogen phosphate is used in the preparation of nondairy powdered creamers. Calculate the molarity of a solution prepared by dissolving 238 g of K2HPO4 in enough water to produce 275 mL of solution.

Accepted Answer

A)   0.732 M
B)   0.865 M
C)   2.66 M
D)   4.97 M
E)   None of these choices are correct.F) A) and E)
G) B) and E)

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

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 choices are correct.F) D) and E)
G) C) and D)

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

Under physiological conditions, amino acids in solution carry

Accepted Answer

A)   no electrical charges.
B)   a net positive charge, due to an -NH3+ group or groups.
C)   a net negative charge, due to a -COO- group or groups.
D)   both -NH2 and -COOH groups.
E)   both -NH3+ and -COO- groups.F) A) and D)
G) All of the above

Question 6

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 are correct.F) D) and E)
G) A) and E)

Question 7

Hexachlorophene is used as a disinfectant in germicidal soaps. What mass of hexachlorophene ( b = 3.63°C/m, boiling point of pure chloroform = 61.70°C A)  12.6 g B)  17.2 g C)  31.0 g D)  34.4 g E)  101 g" class="answers-bank-image d-inline" rel="preload" > = 406.9 g/mol)  must be added to 125 g of chloroform to give a solution with a boiling point of 62.60°C? Kb = 3.63°C/m, boiling point of pure chloroform = 61.70°C

Accepted Answer

A)   12.6 g
B)   17.2 g
C)   31.0 g
D)   34.4 g
E)   101 gF) A) and B)
G) B) and E)

Question 8

Barbiturates are synthetic drugs used as sedatives and hypnotics. Barbital ( b = 3.07°C/m; boiling point of pure acetic acid = 117.9°C A)  117.0°C B)  117.7°C C)  118.1°C D)  118.8°C E)  >120°C" class="answers-bank-image d-inline" rel="preload" > = 184.2 g/mol)  is one of the simplest of these drugs. What is the boiling point of a solution prepared by dissolving 42.5 g of barbital in 825 g of acetic acid? Kb = 3.07°C/m; boiling point of pure acetic acid = 117.9°C

Accepted Answer

A)   117.0°C
B)   117.7°C
C)   118.1°C
D)   118.8°C
E)   >120°CF) A) and E)
G) B) and E)

Question 9

Calculate the freezing point of a solution made by dissolving 3.50 g of potassium chloride ( f = 1.86°C/m. A)  -1.7°C B)  -0.9°C C)  0.0°C D)  0.9°C E)  1.7°C" class="answers-bank-image d-inline" rel="preload" > = 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 E)
G) A) and D)

Question 10

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 mole fraction of ethanol in this solution?

Accepted Answer

A)   0.377
B)   0.392
C)   0.553
D)   0.608
E)   0.623F) A) and B)
G) All of the above

Question 11

How many moles of solute particles are present in 100.0 mL of 2.50 M (NH4) 3PO4?

Accepted Answer

A)   0.100 mol
B)   0.250 mol
C)   0.500 mol
D)   0.750 mol
E)   1.00 molF) C) and E)
G) B) and E)

Question 12

From the following list of aqueous solutions and water, select the one with the lowest freezing point.

Accepted Answer

A)   0.75 m (NH4) 3PO4
B)   1.0 m CaSO4
C)   1.0 m LiClO4
D)   1.5 m CH3OH, methyl alcohol
E)   pure waterF) A) and B)
G) C) and D)

Question 13

Determine the freezing point of a solution that contains 0.31 mol of sucrose in 175 g of water. Kf = 1.86°C/m

Accepted Answer

A)   3.3°C
B)   1.1°C
C)   0.0°C
D)   -1.1°C
E)   -3.3°CF) A) and B)
G) All of the above

Question 14

A 0.100 m MgSO4 solution has a freezing point of -0.23°C. What is the van't Hoff factor for this solution? Kf = 1.86°C/m

Accepted Answer

A)   0.62
B)   1.0
C)   1.2
D)   2.0
E)   4.0F) B) and C)
G) A) and B)

Question 15

Which of the following aqueous solutions will have the lowest osmotic pressure?

Accepted Answer

A)   0.10 m KOH
B)   0.10 m RbCl
C)   0.05 m CaSO4
D)   0.05 m BaCl2
E)   0.10 m K2SO4F) None of the above
G) C) and E)

Question 16

A 0.89% (w/v)  sodium chloride solution is referred to as physiological saline solution because it has the same concentration of salts as human blood. What is the molarity of a physiological saline solution?

Accepted Answer

A)   0.0028 M
B)   0.015 M
C)   0.15 M
D)   0.30 M
E)   0.35 MF) B) and D)
G) A) and E)

Question 17

Calcium nitrite is used as a corrosion inhibitor in lubricants. What is the molality of a solution prepared by dissolving 18.5 g of calcium nitrite in 83.5 g of distilled water?

Accepted Answer

A)   0.0342 m
B)   0.0855 m
C)   0.222 m
D)   0.444 m
E)   1.68 mF) A) and D)
G) B) and E)

Question 18

Carbon tetrachloride, once widely used in fire extinguishers and as a dry cleaning fluid, has been found to cause liver damage to those exposed to its vapors over long periods of time. What is the boiling point of a solution prepared by dissolving 375 g of sulfur (S8, 4? Kb = 5.05°C/m, boiling point of pure CCl4 = 76.7°C? A)  70.8°C B)  75.2°C C)  78.2°C D)  82.6°C E)  >85°C" class="answers-bank-image d-inline" rel="preload" > = 256.5 g/mol)  in 1250 g of CCl4? Kb = 5.05°C/m, boiling point of pure CCl4 = 76.7°C?

Accepted Answer

A)   70.8°C
B)   75.2°C
C)   78.2°C
D)   82.6°C
E)   >85°CF) None of the above
G) D) and E)

Question 19

All solutions are mixtures.

Accepted Answer

A) True 
 B)False

Question 20

The solubility of the oxidizing agent potassium permanganate is 7.1 g per 100.0 g of water at 25°C. What is the mole fraction of potassium permanganate in this solution?

Accepted Answer

A)   0.0080
B)   0.0086
C)   0.066
D)   0.45
E)   0.48F) A) and D)
G) B) and C)

Exam 13: The Properties of Mixtures Solutions and Colloids

Which of the following aqueous solutions will have the lowest osmotic pressure?

Correct Answer
verified

Hexachlorophene is used as a disinfectant in germicidal soaps. What mass of hexachlorophene ( = 406.9 g/mol) must be added to 125 g of chloroform to give a solution with a boiling point of 62.60°C? K_b = 3.63°C/m, boiling point of pure chloroform = 61.70°C

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 mole fraction of ethanol in this solution?

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
verified

Potassium hydrogen phosphate is used in the preparation of nondairy powdered creamers. Calculate the molarity of a solution prepared by dissolving 238 g of K₂HPO₄ in enough water to produce 275 mL of solution.

Correct Answer
verified

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

Correct Answer
verified

From the following list of aqueous solutions and water, select the one with the lowest freezing point.

Correct Answer
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A 0.100 m MgSO4 solution has a freezing point of -0.23°C. What is the van't Hoff factor for this solution? K_f = 1.86°C/m

Correct Answer
verified

Under physiological conditions, amino acids in solution carry

Correct Answer
verified

Determine the freezing point of a solution that contains 0.31 mol of sucrose in 175 g of water. K_f = 1.86°C/m

Correct Answer
verified

Calcium nitrite is used as a corrosion inhibitor in lubricants. What is the molality of a solution prepared by dissolving 18.5 g of calcium nitrite in 83.5 g of distilled water?

Correct Answer
verified

Correct Answer
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How many moles of solute particles are present in 100.0 mL of 2.50 M (NH₄) ₃PO₄?

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
verified

Barbiturates are synthetic drugs used as sedatives and hypnotics. Barbital ( = 184.2 g/mol) is one of the simplest of these drugs. What is the boiling point of a solution prepared by dissolving 42.5 g of barbital in 825 g of acetic acid? K_b = 3.07°C/m; boiling point of pure acetic acid = 117.9°C

Correct Answer
verified

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

Correct Answer
verified

All solutions are mixtures.

Correct Answer
verified

A 0.89% (w/v) sodium chloride solution is referred to as physiological saline solution because it has the same concentration of salts as human blood. What is the molarity of a physiological saline solution?

Correct Answer
verified

The solubility of the oxidizing agent potassium permanganate is 7.1 g per 100.0 g of water at 25°C. What is the mole fraction of potassium permanganate in this solution?

Correct Answer
verified

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

Correct Answer
verified

Exam 13: The Properties of Mixtures Solutions and Colloids

Which of the following aqueous solutions will have the lowest osmotic pressure?

Correct AnswerverifiedShow Answer

Hexachlorophene is used as a disinfectant in germicidal soaps. What mass of hexachlorophene ( = 406.9 g/mol) must be added to 125 g of chloroform to give a solution with a boiling point of 62.60°C? Kb = 3.63°C/m, boiling point of pure chloroform = 61.70°C

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 mole fraction of ethanol in this solution?

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

Potassium hydrogen phosphate is used in the preparation of nondairy powdered creamers. Calculate the molarity of a solution prepared by dissolving 238 g of K2HPO4 in enough water to produce 275 mL of solution.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

From the following list of aqueous solutions and water, select the one with the lowest freezing point.

Correct AnswerverifiedShow Answer

A 0.100 m MgSO4 solution has a freezing point of -0.23°C. What is the van't Hoff factor for this solution? Kf = 1.86°C/m

Correct AnswerverifiedShow Answer

Under physiological conditions, amino acids in solution carry

Correct AnswerverifiedShow Answer

Determine the freezing point of a solution that contains 0.31 mol of sucrose in 175 g of water. Kf = 1.86°C/m

Correct AnswerverifiedShow Answer

Calcium nitrite is used as a corrosion inhibitor in lubricants. What is the molality of a solution prepared by dissolving 18.5 g of calcium nitrite in 83.5 g of distilled water?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

How many moles of solute particles are present in 100.0 mL of 2.50 M (NH4) 3PO4?

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

Barbiturates are synthetic drugs used as sedatives and hypnotics. Barbital ( = 184.2 g/mol) is one of the simplest of these drugs. What is the boiling point of a solution prepared by dissolving 42.5 g of barbital in 825 g of acetic acid? Kb = 3.07°C/m; boiling point of pure acetic acid = 117.9°C

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

All solutions are mixtures.

Correct AnswerverifiedShow Answer

A 0.89% (w/v) sodium chloride solution is referred to as physiological saline solution because it has the same concentration of salts as human blood. What is the molarity of a physiological saline solution?

Correct AnswerverifiedShow Answer

The solubility of the oxidizing agent potassium permanganate is 7.1 g per 100.0 g of water at 25°C. What is the mole fraction of potassium permanganate in this solution?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Correct Answer
verified

Hexachlorophene is used as a disinfectant in germicidal soaps. What mass of hexachlorophene ( = 406.9 g/mol) must be added to 125 g of chloroform to give a solution with a boiling point of 62.60°C? K_b = 3.63°C/m, boiling point of pure chloroform = 61.70°C

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 mole fraction of ethanol in this solution?

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
verified

Potassium hydrogen phosphate is used in the preparation of nondairy powdered creamers. Calculate the molarity of a solution prepared by dissolving 238 g of K₂HPO₄ in enough water to produce 275 mL of solution.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A 0.100 m MgSO4 solution has a freezing point of -0.23°C. What is the van't Hoff factor for this solution? K_f = 1.86°C/m

Correct Answer
verified

Correct Answer
verified

Determine the freezing point of a solution that contains 0.31 mol of sucrose in 175 g of water. K_f = 1.86°C/m

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

How many moles of solute particles are present in 100.0 mL of 2.50 M (NH₄) ₃PO₄?

Correct Answer
verified

Correct Answer
verified

Barbiturates are synthetic drugs used as sedatives and hypnotics. Barbital ( = 184.2 g/mol) is one of the simplest of these drugs. What is the boiling point of a solution prepared by dissolving 42.5 g of barbital in 825 g of acetic acid? K_b = 3.07°C/m; boiling point of pure acetic acid = 117.9°C

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
verified

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

Correct Answer
verified