Question 1

Two aqueous solutions are prepared: 2.0 m Cu(NO3) 2 and 2.0 m NaBr. Which of the following statements is true?

Accepted Answer

A)   The Cu(NO3) 2 solution has a higher vapor pressure and lower freezing point than the NaBr solution.
B)   The Cu(NO3) 2 solution has a higher vapor pressure and higher freezing point than the NaBr solution.
C)   The Cu(NO3) 2 solution has a lower vapor pressure and lower freezing point than the NaBr solution.
D)   The Cu(NO3) 2 solution has a lower vapor pressure and higher freezing point than the NaBr solution.
E)   None of the above statements is true.F) A) and E)
G) All of the above

Question 2

Which, if any, of the following features is common to soaps, detergents, phospholipids, and channel-forming antibiotics?

Accepted Answer

A)   They all contain fatty acids.
B)   They all contain phosphate groups.
C)   They all contain polypeptide chains.
D)   Their function depends on the dual polarity of their molecules.
E)   They have none of the above features in common.F) C) and D)
G) A) and E)

Question 3

Which of the following statements describes the correct method of preparation of 1.00 L of a 2.0 M urea solution? urea = 60.06 g/mol 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." class="answers-bank-image d-inline" rel="preload" > urea = 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 B)
G) D) and E)

Question 4

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 the aboveF) A) and E)
G) A) and B)

Question 5

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

Question 6

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 ( ethanol = 50.0 torr at 25°C. A)  1.8 torr B)  11 torr C)  15 torr D)  40 torr E)  48 torr" class="answers-bank-image d-inline" rel="preload" > = 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) A) and B)
G) C) and D)

Question 7

Based only on the relative lattice energies of the compounds below, which one would be expected to have the lowest solubility in water?

Accepted Answer

A)   NaBr
B)   CaS
C)   NaOH
D)   KI
E)   CsClF) B) and D)
G) D) and E)

Question 8

Dimethylglyoxime, DMG, is an organic compound used to test for aqueous nickel(II)  ions. A solution prepared by dissolving 65.0 g of DMG in 375 g of ethanol boils at 80.3°C. What is the molar mass of DMG? Kb = 1.22°C/m, boiling point of pure ethanol = 78.5°C

Accepted Answer

A)   44.1 g/mol
B)   65.8 g/mol
C)   117 g/mol
D)   131.6 g/mol
E)   553 g/molF) A) and E)
G) D) and E)

Question 9

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

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

The density of pure water at 25°C is 0.997 g/mL. Considering water as being both solvent and solute, calculate its molarity.

Accepted Answer

The answer of The density of pure water at 25°C...

Question 12

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 13

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

Accepted Answer

A)   0.5 m C12H22O11 (sucrose) 
B)   0.5 m Ca(NO3) 2
C)   0.5 m NiSO4
D)   0.5 m Li3PO4
E)   pure waterF) A) and B)
G) A) and C)

Question 14

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 15

Select the weakest electrolyte from the following set.

Accepted Answer

A)   Na2SO4
B)   KCl
C)   CH3CH2COOH, propionic acid
D)   CaCl2
E)   LiOHF) All of the above
G) None of the above

Question 16

Sodium hydroxide is a common ingredient in drain cleaners such as Drano. The mole fraction of sodium hydroxide in a saturated aqueous solution is 0.310. What is the molality of the solution?

Accepted Answer

A)   0.310 m
B)   0.690 m
C)   1.24 m
D)   12.4 m
E)   25.0 mF) A) and E)
G) A) and B)

Question 17

Heats of solution may be either positive or negative.

Accepted Answer

A) True 
 B)False

Question 18

The backbone of a protein chain consists of carbon, nitrogen, and oxygen atoms.

Accepted Answer

A) True 
 B)False

Question 19

Colloidal particles may be either solids, liquids, or gases.

Accepted Answer

A) True 
 B)False

Question 20

The concentration of iodine in sea water is 60. parts per billion by mass. If one assumes that the iodine exists in the form of iodide anions, what is the molarity of iodide in sea water? (The density of sea water is 1.025 g/mL.)

Accepted Answer

A)   4.8 × 10-13 M
B)   4.8 × 10-10 M
C)   4.8 × 10-7 M
D)   4.7 × 10-4 M
E)   4.7 × 10-1 MF) A) and D)
G) A) and E)

Exam 13: The Properties of Mixtures: Solutions and Colloids

Heats of solution may be either positive or negative.

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Colloidal particles may be either solids, liquids, or gases.

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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 ( = 46.07 g/mol) . P°ethanol = 50.0 torr at 25°C.

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?

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The backbone of a protein chain consists of carbon, nitrogen, and oxygen atoms.

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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.

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The concentration of iodine in sea water is 60. parts per billion by mass. If one assumes that the iodine exists in the form of iodide anions, what is the molarity of iodide in sea water? (The density of sea water is 1.025 g/mL.)

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Select the weakest electrolyte from the following set.

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Based only on the relative lattice energies of the compounds below, which one would be expected to have the lowest solubility in water?

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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

The density of pure water at 25°C is 0.997 g/mL. Considering water as being both solvent and solute, calculate its molarity.

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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 AnswerverifiedShow Answer

Dimethylglyoxime, DMG, is an organic compound used to test for aqueous nickel(II) ions. A solution prepared by dissolving 65.0 g of DMG in 375 g of ethanol boils at 80.3°C. What is the molar mass of DMG? Kb = 1.22°C/m, boiling point of pure ethanol = 78.5°C

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Sodium hydroxide is a common ingredient in drain cleaners such as Drano. The mole fraction of sodium hydroxide in a saturated aqueous solution is 0.310. What is the molality of the solution?

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

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

Correct AnswerverifiedShow Answer

Which, if any, of the following features is common to soaps, detergents, phospholipids, and channel-forming antibiotics?

Correct AnswerverifiedShow Answer

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

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

Correct AnswerverifiedShow Answer

Two aqueous solutions are prepared: 2.0 m Cu(NO3) 2 and 2.0 m NaBr. Which of the following statements is true?

Correct AnswerverifiedShow Answer

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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 ( = 46.07 g/mol) . P°_ethanol = 50.0 torr at 25°C.

Correct Answer
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Correct Answer
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Correct Answer
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Cadmium bromide is used in photography and lithography. Calculate the molality of a solution prepared by dissolving 45.38 g of CdBr₂in 375.0 g of water.

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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The pressure inside the flask will initi...
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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 CH₄will dissolve in 3.00 L of benzene if the partial pressure of CH₄is 1.48 atm?

Correct Answer
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Dimethylglyoxime, DMG, is an organic compound used to test for aqueous nickel(II) ions. A solution prepared by dissolving 65.0 g of DMG in 375 g of ethanol boils at 80.3°C. What is the molar mass of DMG? K_b = 1.22°C/m, boiling point of pure ethanol = 78.5°C

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

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Two aqueous solutions are prepared: 2.0 m Cu(NO₃) ₂and 2.0 m NaBr. Which of the following statements is true?

Correct Answer
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