Question 1

Benzaldehyde (106.12 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? (For 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)  -121.1°CF) A) and D)
G) A) and C)

Question 2

Which statement is false?

Accepted Answer

A)  The vapor pressure of a solvent over a solution decreases as its mole fraction increases.
B)  The solubility of a gas increases as the temperature decreases.
C)  The vapor pressure of a solvent over a solution is less than that of pure solvent.
D)  The greater the pressure of a gas over a solution,the greater its solubility.
E)  Ionic solutes dissociate in solution,causing an enhancement of all colligative properties.F) B) and E)
G) None of the above

Question 3

Which solution has the highest vapor pressure?

Accepted Answer

A)  0.75 mol of a nonvolatile compound in 750 g of ethanol
B)  0.75 mol of a volatile compound in 750 g of ethanol
C)  1.5 mol of a nonvolatile compound in 750 g of ethanol
D)  Solutions have the same vapor pressure and it is higher than the vapor pressure of solution.
E)  Not enough information is given to determine which solution has the highest vapor pressure.F) B) and E)
G) C) and D)

Question 4

The osmotic pressure of a 0.82 M HCl solution is 35.9 atm at 18°C.Calculate the van't Hoff factor for HCl at this concentration.

Accepted Answer

A)  1.8
B)  17.2
C)  1.5
D)  2.00E) A) and D)
F) A) and C)

Question 5

Below is a diagram representing a solvent A(l) in a 1-L beaker,and a solute X dissolved in the solvent.Solvent A has a density of 0.8 g/mL,and a molar mass of 40 g/mol. Solute X has a molar mass of 30 g/mol.Each circle of X represents 1 mol of X.Assume that the solute addition does not significantly change the volume of liquid in the beaker.  What is the molality of the solute X in this solution?

Accepted Answer

A)  2 m
B)  4 m
C)  5 m
D)  0.004 m
E)  0.005 mF) A) and E)
G) B) and E)

Question 6

Below is a diagram representing two chambers containing solvent A,separated by a semipermeable membrane (a dashed line) which allows only solvent A to pass through.  If a solute X is added to the chamber on the left,which diagram below best represents how the system will respond in order to reach a new equilibrium?

Accepted Answer

A)   
B)   
C)    C
D)   
E)   F) B) and D)
G) All of the above

Question 7

What mass of ethanol (C2H5OH) ,a nonelectrolyte,must be added to 10.0 L of water to give a solution that freezes at -10.0°C? Assume the density of water is 1.0 g/mL.(Kf of water is 1.86°C/m.)

Accepted Answer

A)  85.7 kg
B)  24.8 kg
C)  5.38 kg
D)  2.48 kg
E)  1.17 kgF) C) and D)
G) All of the above

Question 8

Copper(II) bromide is used as a wood preservative.What mass of CuBr2 is needed to prepare 750.0 mL of a 1.25 M solution?

Accepted Answer

A)  134 g
B)  209 g
C)  372 g
D)  750 g
E)  938 gF) None of the above
G) C) and E)

Question 9

Cadmium bromide is used in photography and lithography.What is the molality of a solution prepared by dissolving 45.38 g of CdBr2 in 375.0 g of water?

Accepted Answer

A)  0.03035 m
B)  0.01600 m
C)  0.1210 m
D)  0.4446 m
E)  16.00 mF) A) and C)
G) D) and E)

Question 10

______________ is the process used to stabilize a colloid that would otherwise not stay dispersed.

Accepted Answer

The answer of ______________ is the process used to stabilize...

Question 11

If a 100-mL sample of a volatile liquid such as diethyl ether is introduced into a 250-mL
flask which is immediately sealed,the pressure inside will increase above atmospheric pressure.Explain.

Accepted Answer

The pressure inside the flask will initi...

Question 12

Potassium fluoride is used for frosting glass.Calculate the molarity of a solution prepared by dissolving 78.6 g of KF in enough water to produce 225 mL of solution.

Accepted Answer

A)  0.304 M
B)  0.349 M
C)  1.35 M
D)  3.29 M
E)  6.01 MF) B) and E)
G) All of the above

Question 13

What is the name of the process in which an ion or a molecule is surrounded by solvent molecules arranged in a specific manner?

Accepted Answer

The answer of What is the name of the process...

Question 14

The density of a 20.3 M CH3OH (methanol) solution is 0.858 g/mL.What is the molality of this solution? H2O is the solvent.

Accepted Answer

A)  17.4 m
B)  20.8 m
C)  23.7 m
D)  70.0 m
E)  97.8 mF) A) and B)
G) B) and E)

Question 15

What is the freezing point of a solution prepared from 50.0 g ethylene glycol (C2H6O2)  and 85.0 g H2O?
(For water,Kf = 1.86°C/m)

Accepted Answer

A)  17.6°C
B)  -176°C
C)  -1.50°C
D)  1.50°C
E)  -17.6°CF) A) and E)
G) B) and E)

Question 16

What is the percent CdSO4 by mass in a 1.00 molal aqueous CdSO4 solution?

Accepted Answer

A)  0.001%
B)  0.10%
C)  17.2%
D)  20.8%
E)  24.4%F) C) and D)
G) All of the above

Question 17

The ______________ ______________ is the scattered light that is caused by the dispersed phase of a colloid that has a beam of light passed through it.

Accepted Answer

The answer of The ______________ ______________ is the scattered light...

Question 18

What mass of water is required to dissolve 25.31 g of potassium nitrate (KNO3) in order to prepare a 0.1982 m solution?

Accepted Answer

A)  0.5101 kg
B)  0.1277 kg
C)  1.000.kg
D)  1.263 kg
E)  0.7917 kgF) A) and C)
G) B) and C)

Question 19

Select the strongest electrolyte from the following set.

Accepted Answer

A)  CH3CH2OH,ethanol
B)  LiNO3
C)  C6H12O6,glucose
D)  CCl4
E)  HFF) B) and E)
G) None of the above

Question 20

Osmosis is the selective passage of solvent molecules through a porous membrane from a more concentrated solution to a more dilute one.

Accepted Answer

A) True 
 B)False

Exam 13: Physical Properties of Solutions

The density of a 20.3 M CH₃OH (methanol) solution is 0.858 g/mL.What is the molality of this solution? H₂O is the solvent.

Correct Answer
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Which solution has the highest vapor pressure?

Correct Answer
verified

Copper(II) bromide is used as a wood preservative.What mass of CuBr₂ is needed to prepare 750.0 mL of a 1.25 M solution?

Correct Answer
verified

What mass of ethanol (C₂H₅OH) ,a nonelectrolyte,must be added to 10.0 L of water to give a solution that freezes at -10.0°C? Assume the density of water is 1.0 g/mL.(K_f of water is 1.86°C/m.)

Correct Answer
verified

Osmosis is the selective passage of solvent molecules through a porous membrane from a more concentrated solution to a more dilute one.

Correct Answer
verified

______________ is the process used to stabilize a colloid that would otherwise not stay dispersed.

Correct Answer
verified

The is the scattered light that is caused by the dispersed phase of a colloid that has a beam of light passed through it.

Correct Answer
verified

If a 100-mL sample of a volatile liquid such as diethyl ether is introduced into a 250-mL flask which is immediately sealed,the pressure inside will increase above atmospheric pressure.Explain.

Correct Answer
verified
The pressure inside the flask will initi...
View Answer

Potassium fluoride is used for frosting glass.Calculate the molarity of a solution prepared by dissolving 78.6 g of KF in enough water to produce 225 mL of solution.

Correct Answer
verified

Correct Answer
verified

What is the percent CdSO₄ by mass in a 1.00 molal aqueous CdSO₄ solution?

Correct Answer
verified

Correct Answer
verified

Select the strongest electrolyte from the following set.

Correct Answer
verified

What is the name of the process in which an ion or a molecule is surrounded by solvent molecules arranged in a specific manner?

Correct Answer
verified

Correct Answer
verified

Which statement is false?

Correct Answer
verified

What is the freezing point of a solution prepared from 50.0 g ethylene glycol (C₂H₆O₂) and 85.0 g H₂O? (For water,K_f = 1.86°C/m)

Correct Answer
verified

Cadmium bromide is used in photography and lithography.What is the molality of a solution prepared by dissolving 45.38 g of CdBr₂ in 375.0 g of water?

Correct Answer
verified

The osmotic pressure of a 0.82 M HCl solution is 35.9 atm at 18°C.Calculate the van't Hoff factor for HCl at this concentration.

Correct Answer
verified

What mass of water is required to dissolve 25.31 g of potassium nitrate (KNO₃) in order to prepare a 0.1982 m solution?

Correct Answer
verified

Exam 13: Physical Properties of Solutions

The density of a 20.3 M CH3OH (methanol) solution is 0.858 g/mL.What is the molality of this solution? H2O is the solvent.

Correct AnswerverifiedShow Answer

Which solution has the highest vapor pressure?

Correct AnswerverifiedShow Answer

Copper(II) bromide is used as a wood preservative.What mass of CuBr2 is needed to prepare 750.0 mL of a 1.25 M solution?

Correct AnswerverifiedShow Answer

What mass of ethanol (C2H5OH) ,a nonelectrolyte,must be added to 10.0 L of water to give a solution that freezes at -10.0°C? Assume the density of water is 1.0 g/mL.(Kf of water is 1.86°C/m.)

Correct AnswerverifiedShow Answer

Osmosis is the selective passage of solvent molecules through a porous membrane from a more concentrated solution to a more dilute one.

Correct AnswerverifiedShow Answer

______________ is the process used to stabilize a colloid that would otherwise not stay dispersed.

Correct AnswerverifiedShow Answer

The ______________ ______________ is the scattered light that is caused by the dispersed phase of a colloid that has a beam of light passed through it.

Correct AnswerverifiedShow Answer

If a 100-mL sample of a volatile liquid such as diethyl ether is introduced into a 250-mL flask which is immediately sealed,the pressure inside will increase above atmospheric pressure.Explain.

Correct AnswerverifiedThe pressure inside the flask will initi...View AnswerShow Answer

Potassium fluoride is used for frosting glass.Calculate the molarity of a solution prepared by dissolving 78.6 g of KF in enough water to produce 225 mL of solution.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What is the percent CdSO4 by mass in a 1.00 molal aqueous CdSO4 solution?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Select the strongest electrolyte from the following set.

Correct AnswerverifiedShow Answer

What is the name of the process in which an ion or a molecule is surrounded by solvent molecules arranged in a specific manner?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which statement is false?

Correct AnswerverifiedShow Answer

What is the freezing point of a solution prepared from 50.0 g ethylene glycol (C2H6O2) and 85.0 g H2O? (For water,Kf = 1.86°C/m)

Correct AnswerverifiedShow Answer

Cadmium bromide is used in photography and lithography.What is the molality of a solution prepared by dissolving 45.38 g of CdBr2 in 375.0 g of water?

Correct AnswerverifiedShow Answer

The osmotic pressure of a 0.82 M HCl solution is 35.9 atm at 18°C.Calculate the van't Hoff factor for HCl at this concentration.

Correct AnswerverifiedShow Answer

What mass of water is required to dissolve 25.31 g of potassium nitrate (KNO3) in order to prepare a 0.1982 m solution?

Correct AnswerverifiedShow Answer

The density of a 20.3 M CH₃OH (methanol) solution is 0.858 g/mL.What is the molality of this solution? H₂O is the solvent.

Correct Answer
verified

Correct Answer
verified

Copper(II) bromide is used as a wood preservative.What mass of CuBr₂ is needed to prepare 750.0 mL of a 1.25 M solution?

Correct Answer
verified

What mass of ethanol (C₂H₅OH) ,a nonelectrolyte,must be added to 10.0 L of water to give a solution that freezes at -10.0°C? Assume the density of water is 1.0 g/mL.(K_f of water is 1.86°C/m.)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The is the scattered light that is caused by the dispersed phase of a colloid that has a beam of light passed through it.

Correct Answer
verified

Correct Answer
verified
The pressure inside the flask will initi...
View Answer

Correct Answer
verified

Correct Answer
verified

What is the percent CdSO₄ by mass in a 1.00 molal aqueous CdSO₄ solution?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

What is the freezing point of a solution prepared from 50.0 g ethylene glycol (C₂H₆O₂) and 85.0 g H₂O? (For water,K_f = 1.86°C/m)

Correct Answer
verified

Cadmium bromide is used in photography and lithography.What is the molality of a solution prepared by dissolving 45.38 g of CdBr₂ in 375.0 g of water?

Correct Answer
verified

Correct Answer
verified

What mass of water is required to dissolve 25.31 g of potassium nitrate (KNO₃) in order to prepare a 0.1982 m solution?

Correct Answer
verified