Question 1

Determine the freezing point of a solution which 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) A) and E)

Question 2

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) A) and B)
G) A) and D)

Question 3

What is the mole fraction of Ar in a mixture containing 10.1 g of Ne, 79.9 g of Ar, and 83.8 g of Kr?

Accepted Answer

A)   0.40
B)   0.25
C)   0.20
D)   0.14
E)   0.058F) None of the above
G) A) and E)

Question 4

The Tyndall effect

Accepted Answer

A)   is observed in concentrated solutions.
B)   is observed only in dilute solutions.
C)   is observed in colloidal dispersions.
D)   is caused by Brownian motion.
E)   is used to determine the osmotic pressure of solutions.F) A) and B)
G) C) and E)

Question 5

Which of the following aqueous solutions should demonstrate the most ideal behavior?

Accepted Answer

A)   0.1 M K2SO4
B)   0.1 M CaCl2
C)   3.0 M LiF
D)   0.1 M MgSO4
E)   0.1 M NaClF) C) and D)
G) A) and B)

Question 6

A saturated solution of carbon dioxide in water contains 3.00 g of CO2 when the CO2 partial pressure is 8.0 atm. What mass of CO2 will escape if the partial pressure is lowered to 3.2 atm?

Accepted Answer

A)   0.90 g
B)   1.20 g
C)   1.40 g
D)   1.80 g
E)   2.20 gF) A) and C)
G) C) and D)

Question 7

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 E)
G) A) and B)

Question 8

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) D) and E)
G) A) and B)

Question 9

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) C) and D)
G) A) and C)

Question 10

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 E)
G) A) and C)

Question 11

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 12

The vapor pressure of pure acetone (propanone)  is 266 torr. When a non-volatile solute is added, the vapor pressure of acetone above the solution falls to 232 torr. What is the mole fraction of the non-volatile solute in the solution?

Accepted Answer

A)   0.87
B)   0.69
C)   0.32
D)   0.13
E)   0.045F) C) and D)
G) D) and E)

Question 13

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) C) and D)
G) A) and B)

Question 14

If the shell of a raw egg is carefully dissolved away, and the egg in its flexible membrane is then placed in distilled water, the egg's volume will expand. Explain.

Accepted Answer

The answer of If the shell of a raw egg...

Question 15

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

Accepted Answer

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

Question 16

When two pure substances are mixed to form a solution

Accepted Answer

A)   heat is released.
B)   heat is absorbed.
C)   there is an increase in entropy.
D)   there is a decrease in entropy.
E)   entropy is conserved.F) A) and C)
G) All of the above

Question 17

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)   l.00 molF) None of the above
G) D) and E)

Question 18

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) C) and E)
G) C) and D)

Question 19

Calculate the molarity of a solution prepared by diluting 1.85 L of 6.5 M KOH to 11.0 L.

Accepted Answer

A)   0.28 M
B)   0.91 M
C)   1.1 M
D)   3.1 M
E)   3.9 MF) D) and E)
G) A) and B)

Question 20

List five important intermolecular forces that operate in globular proteins, and explain what parts of the molecule are involved in these forces.

Accepted Answer

1. Ion-dipole forces. These exist betwee...

Exam 13: The Properties of Mixtures: Solutions and Colloids

A 0.100 m K₂SO₄solution has a freezing point of -0.43°C. What is the van't Hoff factor for this solution? K_f = 1.86°C/m

Correct Answer
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If the shell of a raw egg is carefully dissolved away, and the egg in its flexible membrane is then placed in distilled water, the egg's volume will expand. Explain.

Correct Answer
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Correct Answer
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What is the mole fraction of Ar in a mixture containing 10.1 g of Ne, 79.9 g of Ar, and 83.8 g of Kr?

Correct Answer
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A saturated solution of carbon dioxide in water contains 3.00 g of CO₂ when the CO₂ partial pressure is 8.0 atm. What mass of CO₂ will escape if the partial pressure is lowered to 3.2 atm?

Correct Answer
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The Tyndall effect

Correct Answer
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The vapor pressure of pure acetone (propanone) is 266 torr. When a non-volatile solute is added, the vapor pressure of acetone above the solution falls to 232 torr. What is the mole fraction of the non-volatile solute in the solution?

Correct Answer
verified

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

Correct Answer
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If a solute dissolves in an endothermic process

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
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

List five important intermolecular forces that operate in globular proteins, and explain what parts of the molecule are involved in these forces.

Correct Answer
verified
1. Ion-dipole forces. These exist betwee...
View Answer

Colligative properties depend on

Correct Answer
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Which of the following aqueous solutions should demonstrate the most ideal behavior?

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

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

Correct Answer
verified

Calculate the molarity of a solution prepared by diluting 1.85 L of 6.5 M KOH to 11.0 L.

Correct Answer
verified

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

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

When two pure substances are mixed to form a solution

Correct Answer
verified

Exam 13: The Properties of Mixtures: Solutions and Colloids

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

Correct AnswerverifiedShow Answer

If the shell of a raw egg is carefully dissolved away, and the egg in its flexible membrane is then placed in distilled water, the egg's volume will expand. Explain.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What is the mole fraction of Ar in a mixture containing 10.1 g of Ne, 79.9 g of Ar, and 83.8 g of Kr?

Correct AnswerverifiedShow Answer

A saturated solution of carbon dioxide in water contains 3.00 g of CO2 when the CO2 partial pressure is 8.0 atm. What mass of CO2 will escape if the partial pressure is lowered to 3.2 atm?

Correct AnswerverifiedShow Answer

The Tyndall effect

Correct AnswerverifiedShow Answer

The vapor pressure of pure acetone (propanone) is 266 torr. When a non-volatile solute is added, the vapor pressure of acetone above the solution falls to 232 torr. What is the mole fraction of the non-volatile solute in the solution?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

If a solute dissolves in an endothermic process

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

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

List five important intermolecular forces that operate in globular proteins, and explain what parts of the molecule are involved in these forces.

Correct Answerverified1. Ion-dipole forces. These exist betwee...View AnswerShow Answer

Colligative properties depend on

Correct AnswerverifiedShow Answer

Which of the following aqueous solutions should demonstrate the most ideal behavior?

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

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 molarity of a solution prepared by diluting 1.85 L of 6.5 M KOH to 11.0 L.

Correct AnswerverifiedShow Answer

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

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

When two pure substances are mixed to form a solution

Correct AnswerverifiedShow Answer

A 0.100 m K₂SO₄solution has a freezing point of -0.43°C. What is the van't Hoff factor for this solution? K_f = 1.86°C/m

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A saturated solution of carbon dioxide in water contains 3.00 g of CO₂ when the CO₂ partial pressure is 8.0 atm. What mass of CO₂ will escape if the partial pressure is lowered to 3.2 atm?

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

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
verified

Correct Answer
verified

Correct Answer
verified
1. Ion-dipole forces. These exist betwee...
View Answer

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Determine the freezing point of a solution which 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