Question 1

Select the strongest electrolyte from the following set.

Accepted Answer

A)  CH 3CH 2OH, ethanol
B)  LiNO 3
C)  C 6H 12O 6, glucose
D)  CCl 4
E)  HFF) All of the above
G) D) and E)

Question 2

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

Question 3

Helical segments of protein molecules arise through hydrogen bonding between C=O and N-H groups.

Accepted Answer

A) True 
 B)False

Question 4

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, ℳ= 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) C) and D)
G) None of the above

Question 5

Methane has a Henry's Law constant (k)  of 9.88 × 10−2 mol/(L·atm)  when dissolved in benzene at 25°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 gF) A) and C)
G) C) and D) E

Question 6

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

Question 7

The dimensions of typical colloidal particles are of the order of

Accepted Answer

A)  dm
B)  pm
C)  hm
D)  mm
E)  fmF) A) and D)
G) B) and C)

Question 8

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) None of the above
G) A) and B)

Question 9

An emulsion is a dispersion consisting of a

Accepted Answer

A)  solid in a liquid.
B)  liquid in a liquid.
C)  gas in a liquid.
D)  liquid in a solid.
E)  gas in a solid.F) A) and B)
G) A) and C)

Question 10

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

Question 11

Which of the following aqueous liquids will have the lowest freezing point?

Accepted Answer

A)  0.5 m C 12H 22O 11 (sucrose) 
B)  0.5 m Ca(NO 3) 2
C)  0.5 m NiSO 4
D)  0.5 m Li 3PO 4
E)  Pure waterF) C) and D)
G) A) and C)

Question 12

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

Accepted Answer

A)  0.1 M NaI
B)  0.2 M CuSO 4
C)  0.5 M KBr
D)  2.0 M CuCl 2
E)  2.0 M CsClF) A) and B)
G) A) and C)

Question 13

Soda drinks bubble when the bottle is opened because

Accepted Answer

A)  the temperature of the soda increases.
B)  exposure to atmospheric pressure squeezes the carbon dioxide from solution.
C)  the partial pressure of carbon dioxide above the solution is reduced.
D)  atmospheric nitrogen molecules displace carbon dioxide molecules.
E)  the Henry's law constant changes due to the change in pressure.F) B) and E)
G) D) and E)

Question 14

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

Question 15

Select the weakest electrolyte from the following set.

Accepted Answer

A)  Na 2 SO 4
B)  KCl
C)  CH 3 CH 2 COOH, propionic acid
D)  CaCl 2
E)  LiOHF) A) and B)
G) A) and C)

Question 16

Consider the molecular substances I2, H2O, and C8H18. Which of them is/are soluble in CCl4?

Accepted Answer

A)  Only I 2
B)  Only H 2O
C)  Only C 8H 18
D)  I 2 and C 8H 18
E)  H 2O and C 8H 18F) A) and B)
G) A) and C)

Question 17

Which of the following sets of conditions could exist when two liquids which are completely miscible in one another are mixed?

Accepted Answer

A)  Δ H soln > 0, entropy of system decreases
B)  Δ H soln ≈ 0, entropy of system decreases
C)  Δ H soln ≈ 0, entropy change of system ≈ 0
D)  Δ H soln ≈ 0, entropy of system increases
E)  None of these choices are correct.F) B) and E)
G) A) and E) D

Question 18

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 19

Saccharin, one of the first non-nutritive sweeteners used in soft-drinks, is 500 times sweeter than sugar in dilute aqueous solutions. The solubility of saccharin is 1.00 gram per 290 mL of solution. What is the molarity of a saturated saccharin solution? (ℳsaccharin = 183.2 g/mol)

Accepted Answer

A)  0.0188 M
B)  0.632 M
C)  1.58 M
D)  3.45 M
E)  None of these choices are correct.F) C) and D)
G) A) and C) A

Question 20

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

Exam 13: The Properties of Mixtures: Solutions and Colloids

Select the strongest electrolyte from the following set.

Correct Answer
verified

A 0.100 m K₂SO₄ solution 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

Helical segments of protein molecules arise through hydrogen bonding between C=O and N-H groups.

Correct Answer
verified

Correct Answer
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Methane has a Henry's Law constant (k) of 9.88 × 10⁻² mol/(L·atm) when dissolved in benzene at 25°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
E

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

The dimensions of typical colloidal particles are of the order of

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

An emulsion is a dispersion consisting of a

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

Which of the following aqueous liquids will have the lowest freezing point?

Correct Answer
verified

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

Correct Answer
verified

Soda drinks bubble when the bottle is opened because

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

Select the weakest electrolyte from the following set.

Correct Answer
verified

Consider the molecular substances I₂, H₂O, and C₈H₁₈. Which of them is/are soluble in CCl₄?

Correct Answer
verified

Which of the following sets of conditions could exist when two liquids which are completely miscible in one another are mixed?

Correct Answer
verified
D

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

Saccharin, one of the first non-nutritive sweeteners used in soft-drinks, is 500 times sweeter than sugar in dilute aqueous solutions. The solubility of saccharin is 1.00 gram per 290 mL of solution. What is the molarity of a saturated saccharin solution? (ℳ_saccharin = 183.2 g/mol)

Correct Answer
verified
A

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

Exam 13: The Properties of Mixtures: Solutions and Colloids

Select the strongest electrolyte from the following set.

Correct AnswerverifiedShow Answer

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

Helical segments of protein molecules arise through hydrogen bonding between C=O and N-H groups.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Methane has a Henry's Law constant (k) of 9.88 × 10−2 mol/(L·atm) when dissolved in benzene at 25°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 AnswerverifiedE

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

The dimensions of typical colloidal particles are of the order of

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

An emulsion is a dispersion consisting of a

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

Which of the following aqueous liquids will have the lowest freezing point?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Soda drinks bubble when the bottle is opened because

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

Select the weakest electrolyte from the following set.

Correct AnswerverifiedShow Answer

Consider the molecular substances I2, H2O, and C8H18. Which of them is/are soluble in CCl4?

Correct AnswerverifiedShow Answer

Which of the following sets of conditions could exist when two liquids which are completely miscible in one another are mixed?

Correct AnswerverifiedD

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

Saccharin, one of the first non-nutritive sweeteners used in soft-drinks, is 500 times sweeter than sugar in dilute aqueous solutions. The solubility of saccharin is 1.00 gram per 290 mL of solution. What is the molarity of a saturated saccharin solution? (ℳsaccharin = 183.2 g/mol)

Correct AnswerverifiedA

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

Correct Answer
verified

A 0.100 m K₂SO₄ solution 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

Methane has a Henry's Law constant (k) of 9.88 × 10⁻² mol/(L·atm) when dissolved in benzene at 25°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
E

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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Correct Answer
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Correct Answer
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Correct Answer
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Consider the molecular substances I₂, H₂O, and C₈H₁₈. Which of them is/are soluble in CCl₄?

Correct Answer
verified

Correct Answer
verified
D

Correct Answer
verified

Saccharin, one of the first non-nutritive sweeteners used in soft-drinks, is 500 times sweeter than sugar in dilute aqueous solutions. The solubility of saccharin is 1.00 gram per 290 mL of solution. What is the molarity of a saturated saccharin solution? (ℳ_saccharin = 183.2 g/mol)

Correct Answer
verified
A

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