Question 1

Select the type of interaction that best describes the attraction between Mg2+ ions and water molecules.

Accepted Answer

A)  dipole-dipole
B)  dipole-induced dipole
C)  ion-dipole
D)  ion-induced dipole
E)  ion-hydrogen bondF) A) and E)
G) A) and B)

Question 2

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

Question 3

Calculate the vapor pressure of a solution prepared by dissolving 0.500 mol of a non-volatile solute in 275 g of hexane (ℳ = 86.18 g/mol)  at 49.6°C. P°hexane = 400.0 torr at 49.6°C.

Accepted Answer

A)  54 torr
B)  154 torr
C)  246 torr
D)  346 torr
E)  400. torrF) C) and D)
G) B) and C)

Question 4

All solutions are mixtures

Accepted Answer

A) True 
 B)False

Question 5

Lysine is an amino acid that is an essential part of nutrition but which is not synthesized by the human body. What is the molar mass of lysine if 750.0 mL of a solution containing 8.60 g of lysine has an osmotic pressure of 1.918 atm? Temperature = 25.0°C

Accepted Answer

A)  110. g/mol
B)  146 g/mol
C)  220. g/mol
D)  1340 g/mol
E)  1780 g/molF) B) and E)
G) None of the above

Question 6

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

Question 7

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) A) and D)

Question 8

Cinnamaldehyde (ℳ = 132.15 g/mol)  is used as a flavoring agent. What mass of cinnamaldehyde must be added to 175 g of ethanol to give a solution whose boiling point is 82.7°C? Kb = 1.22°C/m, boiling point of pure ethanol = 78.5°C

Accepted Answer

A)  62.4 g
B)  67.8 g
C)  76.2 g
D)  78.5 g
E)  79.6 gF) A) and D)
G) B) and D)

Question 9

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

Question 10

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

Accepted Answer

A)  0.1 M K 2SO 4
B)  0.1 M CaCl 2
C)  3.0 M LiF
D)  0.1 M MgSO 4
E)  0.1 M NaClF) A) and E)
G) A) and D)

Question 11

What is the mole fraction of Ne 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) A) and C)
G) B) and D)

Question 12

Which of the following statements describes the correct method of preparation of 1.00 L of a 2.0 M urea solution? ℳurea = 60.06 g/mol

Accepted Answer

A)  Dissolve 120 g of urea in 1.00 kg of distilled water.
B)  Dissolve 120 g of urea in 880 g of distilled water.
C)  Dissolve 120 g of urea in enough distilled water to produce 1.00 L of solution.
D)  Dissolve 120 g of urea in 1.00 liter of distilled water.
E)  The density of urea is needed in order to do this calculation.F) A) and D)
G) A) and B)

Question 13

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)  Mg 2+, Sr 2+
C)  Ca 2+, Sc 3+
D)  Na +, Li +
E)  None of these choices are correct.F) B) and D)
G) None of the above

Question 14

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

Question 15

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

Question 16

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

Exam 13: The Properties of Mixtures: Solutions and Colloids

Cinnamaldehyde (ℳ = 132.15 g/mol) is used as a flavoring agent. What mass of cinnamaldehyde must be added to 175 g of ethanol to give a solution whose boiling point is 82.7°C? K_b = 1.22°C/m, boiling point of pure ethanol = 78.5°C

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

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

All solutions are mixtures

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

Calculate the vapor pressure of a solution prepared by dissolving 0.500 mol of a non-volatile solute in 275 g of hexane (ℳ = 86.18 g/mol) at 49.6°C. P°_hexane = 400.0 torr at 49.6°C.

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

Lysine is an amino acid that is an essential part of nutrition but which is not synthesized by the human body. What is the molar mass of lysine if 750.0 mL of a solution containing 8.60 g of lysine has an osmotic pressure of 1.918 atm? Temperature = 25.0°C

Correct Answer
verified

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

Correct Answer
verified

Which of the following statements describes the correct method of preparation of 1.00 L of a 2.0 M urea solution? ℳ_urea= 60.06 g/mol

Correct Answer
verified

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

Correct Answer
verified

When two pure substances are mixed to form a solution

Correct Answer
verified

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

Correct Answer
verified

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

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

Select the type of interaction that best describes the attraction between Mg²⁺ ions and water molecules.

Correct Answer
verified

Exam 13: The Properties of Mixtures: Solutions and Colloids

Cinnamaldehyde (ℳ = 132.15 g/mol) is used as a flavoring agent. What mass of cinnamaldehyde must be added to 175 g of ethanol to give a solution whose boiling point is 82.7°C? Kb = 1.22°C/m, boiling point of pure ethanol = 78.5°C

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

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

All solutions are mixtures

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

Calculate the vapor pressure of a solution prepared by dissolving 0.500 mol of a non-volatile solute in 275 g of hexane (ℳ = 86.18 g/mol) at 49.6°C. P°hexane = 400.0 torr at 49.6°C.

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

Lysine is an amino acid that is an essential part of nutrition but which is not synthesized by the human body. What is the molar mass of lysine if 750.0 mL of a solution containing 8.60 g of lysine has an osmotic pressure of 1.918 atm? Temperature = 25.0°C

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following statements describes the correct method of preparation of 1.00 L of a 2.0 M urea solution? ℳurea = 60.06 g/mol

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

When two pure substances are mixed to form a solution

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

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

Select the type of interaction that best describes the attraction between Mg2+ ions and water molecules.

Correct AnswerverifiedShow Answer

Cinnamaldehyde (ℳ = 132.15 g/mol) is used as a flavoring agent. What mass of cinnamaldehyde must be added to 175 g of ethanol to give a solution whose boiling point is 82.7°C? K_b = 1.22°C/m, boiling point of pure ethanol = 78.5°C

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

Calculate the vapor pressure of a solution prepared by dissolving 0.500 mol of a non-volatile solute in 275 g of hexane (ℳ = 86.18 g/mol) at 49.6°C. P°_hexane = 400.0 torr at 49.6°C.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Which of the following statements describes the correct method of preparation of 1.00 L of a 2.0 M urea solution? ℳ_urea= 60.06 g/mol

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

Correct Answer
verified

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

Select the type of interaction that best describes the attraction between Mg²⁺ ions and water molecules.

Correct Answer
verified