Question 1

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 the aboveF) A) and D)
G) A) and E)

Question 2

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

Question 3

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 B)
G) B) and C)

Question 4

Raoult's Law relates the vapor pressure of the solvent above the solution to its mole fraction in the solution. Which of the following is an accurate statement?

Accepted Answer

A)   Raoult's Law applies exactly to all solutions.
B)   Raoult's Law works best when applied to concentrated solutions.
C)   Raoult's Law works best when applied to dilute solutions.
D)   Raoult's Law applies only to non-ideal solutions.
E)   None of the above statements is accurate.F) B) and E)
G) B) and C)

Question 5

How many moles of bromide ions are present in 750.0 mL of 1.35 M MgBr2?

Accepted Answer

A)   0.506 mol
B)   1.01 mol
C)   2.03 mol
D)   3.04 mol
E)   none of the aboveF) All of the above
G) A) and E)

Question 6

List three important intermolecular forces that operate in DNA, and explain what parts of the molecule are involved in these forces.

Accepted Answer

1. Ion-dipole forces. These exist betwee...

Question 7

Heats of hydration may be either positive or negative.

Accepted Answer

A) True 
 B)False

Question 8

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 D)
G) All of the above

Question 9

Classify the following as either solutions or colloids. If a colloid, name the type of colloid and identify both the dispersed and the dispersing phases.
a. glucose in water
b. smoke in air
c. carbon dioxide in air
d. milk

Accepted Answer

a. solution
b. collo...

Question 10

The larger the ion, the greater in magnitude will be its heat of hydration.

Accepted Answer

A) True 
 B)False

Question 11

A 50.0 % (w/w) solution of sulfuric acid (H2SO4) in water has a density of 1.395 g/mL. What is its molarity?

Accepted Answer

Question 12

Gases with high boiling points tend to be more soluble in water than ones with low boiling points.

Accepted Answer

A) True 
 B)False

Question 13

How many moles of sulfate ions are present in 1.0 L of 0.5 M Li2SO4?

Accepted Answer

A)   0.5 mol
B)   1.0 mol
C)   1.5 mol
D)   2.0 mol
E)   3.0 molF) None of the above
G) C) and E)

Question 14

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

Question 15

Consider the expression below, showing the terms which contribute to the heat of solution, Hsoln: Hsoln = Hsolute + Hsolvent + Hmix
Which of the following sets correctly shows the signs (positive or negative)  of the three terms on the right hand side of the equation?

Accepted Answer

A)   .Hsolute > 0; Hsolvent > 0; Hmix > 0
B)   .Hsolute Hsolvent Hmix 
C)   .Hsolute > 0; Hsolvent > 0; Hmix 
D)   .Hsolute Hsolvent Hmix > 0
E)   .Hsolute Hsolvent > 0; Hmix < 0F) C) and D)
G) B) and D)

Question 16

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

Accepted Answer

A)   .Hsoln > 0, entropy of system decreases
B)   .Hsoln  0, entropy of system decreases
C)   .Hsoln  0, entropy change of system  0
D)   .Hsoln  0, entropy of system increases
E)   none of the aboveF) A) and B)
G) A) and C)

Question 17

Which of the following ions will be expected to have the most negative heat of hydration, Hhydr?

Accepted Answer

A)   Na+
B)   Cs+
C)   Ca2+
D)   F-
E)   I-F) C) and E)
G) D) and E)

Question 18

All solutions are mixtures.

Accepted Answer

A) True 
 B)False

Question 19

Under physiological conditions, amino acids in solution carry

Accepted Answer

A)   no electrical charges.
B)   a net positive charge, due to an -NH3+ group or groups.
C)   a net negative charge, due to a -COO- group or groups.
D)   both -NH2 and -COOH groups.
E)   both -NH3+ and -COO- groups.F) B) and C)
G) B) and E)

Question 20

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

Exam 13: The Properties of Mixtures: Solutions and Colloids

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

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 of the following ions will be expected to have the most negative heat of hydration, Hhydr?

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

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

How many moles of bromide ions are present in 750.0 mL of 1.35 M MgBr2?

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 AnswerverifiedShow Answer

Heats of hydration may be either positive or negative.

Correct AnswerverifiedShow Answer

Gases with high boiling points tend to be more soluble in water than ones with low boiling points.

Correct AnswerverifiedShow Answer

Raoult's Law relates the vapor pressure of the solvent above the solution to its mole fraction in the solution. Which of the following is an accurate statement?

Correct AnswerverifiedShow Answer

A 50.0 % (w/w) solution of sulfuric acid (H2SO4) in water has a density of 1.395 g/mL. What is its molarity?

Correct AnswerverifiedShow Answer

How many moles of sulfate ions are present in 1.0 L of 0.5 M Li2SO4?

Correct AnswerverifiedShow Answer

The larger the ion, the greater in magnitude will be its heat of hydration.

Correct AnswerverifiedShow Answer

The shape of a protein molecule is determined completely by

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 AnswerverifiedShow Answer

Under physiological conditions, amino acids in solution carry

Correct AnswerverifiedShow Answer

List three important intermolecular forces that operate in DNA, and explain what parts of the molecule are involved in these forces.

Correct Answerverified1. Ion-dipole forces. These exist betwee...View AnswerShow Answer

Consider the expression below, showing the terms which contribute to the heat of solution, Hsoln: Hsoln = Hsolute + Hsolvent + Hmix Which of the following sets correctly shows the signs (positive or negative) of the three terms on the right hand side of the equation?

Correct AnswerverifiedShow Answer

Classify the following as either solutions or colloids. If a colloid, name the type of colloid and identify both the dispersed and the dispersing phases. a. glucose in water b. smoke in air c. carbon dioxide in air d. milk

Correct Answerverifieda. solutionb. collo...View AnswerShow Answer

All solutions are mixtures.

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Which of the following ions will be expected to have the most negative heat of hydration, H_hydr?

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Copper(II) bromide is used as a wood preservative. What mass of CuBr₂is needed to prepare 750.0 mL of a 1.25 M solution?

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How many moles of bromide ions are present in 750.0 mL of 1.35 M MgBr₂?

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A 50.0 % (w/w) solution of sulfuric acid (H₂SO₄) in water has a density of 1.395 g/mL. What is its molarity?

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How many moles of sulfate ions are present in 1.0 L of 0.5 M Li₂SO₄?

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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
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Correct Answer
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1. Ion-dipole forces. These exist betwee...
View Answer

Consider the expression below, showing the terms which contribute to the heat of solution, H_soln: H_soln = H_solute+ H_solvent+ H_mix Which of the following sets correctly shows the signs (positive or negative) of the three terms on the right hand side of the equation?

Correct Answer
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a. solution
b. collo...
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