Question 1

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 E)
G) D) and E)

Question 2

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

Question 3

The shape of a protein molecule is determined completely by

Accepted Answer

A)  hydrogen bonding.
B)  ion-dipole attractions.
C)  dispersion forces.
D)  disulfide bridges.
E)  the sequence of amino acids in the chain.F) D) and E)
G) A) and B)

Question 4

Colloidal particles may be solids, liquids, or gases.

Accepted Answer

A) True 
 B)False

Question 5

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 D)
G) All of the above

Question 6

The Henry's Law constant (k)  for carbon monoxide in water at 25°C is 9.71 × 10−4 mol/(L·atm) . How many grams of CO will dissolve in 1.00 L of water if the partial pressure of CO is 2.75 atm?

Accepted Answer

A)  3.53 × 10 −4 g
B)  2.67 × 10 −3 g
C)  9.89 × 10 −3 g
D)  7.48 × 10 −2 g
E)  None of these choices are correct.F) A) and E)
G) A) and C)

Question 7

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 acetone in the solution?

Accepted Answer

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

Question 8

In general, water is a good solvent for both polar and nonpolar compounds.

Accepted Answer

A) True 
 B)False

Question 9

Heats of solution may be either positive or negative.

Accepted Answer

A) True 
 B)False

Question 10

From the following list of aqueous solutions and water, select the one with the highest boiling point.

Accepted Answer

A)  1.0 m KNO 3
B)  0.75 m NaCl
C)  0.75 m CuCl 2
D)  2.0 m C 12H 22O 11 (sucrose) 
E)  pure waterF) A) and C)
G) A) and E)

Question 11

The most abundant molecules in the cell membranes of most species are

Accepted Answer

A)  proteins.
B)  sugars.
C)  phospholipids.
D)  fatty acids.
E)  steroids.F) C) and E)
G) B) and D)

Question 12

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)  938 g
E)  > 1 kgF) None of the above
G) A) and D)

Question 13

Cadmium bromide is used in photography and lithography. Calculate 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)  None of these choices are correct.F) B) and E)
G) D) and E)

Question 14

A solution of sucrose (sugar)  in water is in equilibrium with solid sucrose. If more solid sucrose is now added, with stirring,

Accepted Answer

A)  the concentration of the solution will increase.
B)  the concentration of the solution will decrease.
C)  the concentration of the solution will remain the same.
D)  the volume of solution will increase.
E)  a supersaturated solution will be produced.F) A) and B)
G) A) and C)

Question 15

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

Question 16

Benzaldehyde ( ℳ = 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) A) and E)
G) A) and D)

Question 17

Procaine hydrochloride (ℳ = 272.77 g/mol)  is used as a local anesthetic. Calculate the molarity of a 4.666 m solution which has a density of 1.1066 g/mL.

Accepted Answer

A)  2.272 M
B)  4.056 M
C)  4.216 M
D)  4.666 M
E)  None of these choices are correct.F) B) and C)
G) A) and E)

Question 18

The solubility of gases in water increases with increase in the pressure of the gas.

Accepted Answer

A) True 
 B)False

Question 19

Safrole is used as a topical antiseptic. Calculate the vapor pressure of a solution prepared by dissolving 0.75 mol of safrole in 950 g of ethanol (ℳ = 46.07 g/mol) . P°ethanol = 50.0 torr at 25°C.

Accepted Answer

A)  1.8 torr
B)  11 torr
C)  15 torr
D)  40 torr
E)  48 torrF) B) and D)
G) B) and C)

Question 20

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

Exam 13: The Properties of Mixtures: Solutions and Colloids

The Henry's Law constant (k) for carbon monoxide in water at 25°C is 9.71 × 10⁻⁴ mol/(L·atm) . How many grams of CO will dissolve in 1.00 L of water if the partial pressure of CO is 2.75 atm?

Correct Answer
verified

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

Safrole is used as a topical antiseptic. Calculate the vapor pressure of a solution prepared by dissolving 0.75 mol of safrole in 950 g of ethanol (ℳ = 46.07 g/mol) . P°_ethanol = 50.0 torr at 25°C.

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

Procaine hydrochloride (ℳ = 272.77 g/mol) is used as a local anesthetic. Calculate the molarity of a 4.666 m solution which has a density of 1.1066 g/mL.

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

The solubility of gases in water increases with increase in the pressure of the gas.

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

Heats of solution may be either positive or negative.

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 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

Correct Answer
verified

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

Correct Answer
verified

Colloidal particles may be solids, liquids, or gases.

Correct Answer
verified

The shape of a protein molecule is determined completely by

Correct Answer
verified

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 acetone in the solution?

Correct Answer
verified

A solution of sucrose (sugar) in water is in equilibrium with solid sucrose. If more solid sucrose is now added, with stirring,

Correct Answer
verified

From the following list of aqueous solutions and water, select the one with the highest boiling point.

Correct Answer
verified

In general, water is a good solvent for both polar and nonpolar compounds.

Correct Answer
verified

The most abundant molecules in the cell membranes of most species are

Correct Answer
verified

Exam 13: The Properties of Mixtures: Solutions and Colloids

The Henry's Law constant (k) for carbon monoxide in water at 25°C is 9.71 × 10−4 mol/(L·atm) . How many grams of CO will dissolve in 1.00 L of water if the partial pressure of CO is 2.75 atm?

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

Safrole is used as a topical antiseptic. Calculate the vapor pressure of a solution prepared by dissolving 0.75 mol of safrole in 950 g of ethanol (ℳ = 46.07 g/mol) . P°ethanol = 50.0 torr at 25°C.

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

Procaine hydrochloride (ℳ = 272.77 g/mol) is used as a local anesthetic. Calculate the molarity of a 4.666 m solution which has a density of 1.1066 g/mL.

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

The solubility of gases in water increases with increase in the pressure of the gas.

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

Heats of solution may be either positive or negative.

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 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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Colloidal particles may be solids, liquids, or gases.

Correct AnswerverifiedShow Answer

The shape of a protein molecule is determined completely by

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 acetone in the solution?

Correct AnswerverifiedShow Answer

A solution of sucrose (sugar) in water is in equilibrium with solid sucrose. If more solid sucrose is now added, with stirring,

Correct AnswerverifiedShow Answer

From the following list of aqueous solutions and water, select the one with the highest boiling point.

Correct AnswerverifiedShow Answer

In general, water is a good solvent for both polar and nonpolar compounds.

Correct AnswerverifiedShow Answer

The most abundant molecules in the cell membranes of most species are

Correct AnswerverifiedShow Answer

The Henry's Law constant (k) for carbon monoxide in water at 25°C is 9.71 × 10⁻⁴ mol/(L·atm) . How many grams of CO will dissolve in 1.00 L of water if the partial pressure of CO is 2.75 atm?

Correct Answer
verified

Correct Answer
verified

Safrole is used as a topical antiseptic. Calculate the vapor pressure of a solution prepared by dissolving 0.75 mol of safrole in 950 g of ethanol (ℳ = 46.07 g/mol) . P°_ethanol = 50.0 torr at 25°C.

Correct Answer
verified

Correct Answer
verified

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

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

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 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

Correct Answer
verified

Cadmium bromide is used in photography and lithography. Calculate 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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified