Question 1

All solutions are mixtures.

Accepted Answer

A) True 
 B)False

Question 2

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)  0.623 
A)  0.377 
B)  0.392 
C)  0.553 
D)  0.608 
E)  0.623

Question 3

Which of the following aqueous solutions will have the lowest osmotic pressure?

Accepted Answer

A)  0.10 m KOH 
B)  0.10 m RbCl 
C)  0.05 m CaSO4 
D)  0.05 m BaCl2 
E)  0.10 m K2SO4 
A)  0.10 m KOH 
B)  0.10 m RbCl 
C)  0.05 m CaSO4 
D)  0.05 m BaCl2 
E)  0.10 m K2SO4

Question 4

Carbon tetrachloride, once widely used in fire extinguishers and as a dry cleaning fluid, has been found to cause liver damage to those exposed to its vapors over long periods of time. What is the boiling point of a solution prepared by dissolving 375 g of sulfur (S8,   = 256.5 g/mol) in 1250 g of CCl4? Kb = 5.05°C/m, boiling point of pure CCl4 = 76.7°C?

Accepted Answer

A)  70.8°C 
B)  75.2°C 
C)  78.2°C 
D)  82.6°C 
E)  >85°C 
A)  70.8°C 
B)  75.2°C 
C)  78.2°C 
D)  82.6°C 
E)  >85°C

Question 5

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. 
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.

Question 6

Barbiturates are synthetic drugs used as sedatives and hypnotics. Barbital (   = 184.2 g/mol) is one of the simplest of these drugs. What is the boiling point of a solution prepared by dissolving 42.5 g of barbital in 825 g of acetic acid? Kb = 3.07°C/m; boiling point of pure acetic acid = 117.9°C

Accepted Answer

A)  117.0°C 
B)  117.7°C 
C)  118.1°C 
D)  118.8°C 
E)  >120°C 
A)  117.0°C 
B)  117.7°C 
C)  118.1°C 
D)  118.8°C 
E)  >120°C

Question 7

Calculate the freezing point of a solution made by dissolving 3.50 g of potassium chloride (   = 74.55 g/mol) in 100.0 g of water. Assume ideal behavior for the solution; Kf = 1.86°C/m.

Accepted Answer

A)  -1.7°C 
B)  -0.9°C 
C)  0.0°C 
D)  0.9°C 
E)  1.7°C 
A)  -1.7°C 
B)  -0.9°C 
C)  0.0°C 
D)  0.9°C 
E)  1.7°C

Question 8

Which of the following pairs of ions is arranged so that the ion with the smaller charge density is listed first?

Accepted Answer

A)  K+, Rb+ 
B)  Cl-, K+ 
C)  Cl-, Br- 
D)  Ca2+, Ba2+ 
E)  None of these choices are correct. 
A)  K+, Rb+ 
B)  Cl-, K+ 
C)  Cl-, Br- 
D)  Ca2+, Ba2+ 
E)  None of these choices are correct.

Question 9

A 0.100 m MgSO4 solution has a freezing point of -0.23°C. What is the van't Hoff factor for this solution? Kf = 1.86°C/m

Accepted Answer

A)  0.62 
B)  1.0 
C)  1.2 
D)  2.0 
E)  4.0 
A)  0.62 
B)  1.0 
C)  1.2 
D)  2.0 
E)  4.0

Question 10

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 mol 
A)  0.100 mol 
B)  0.250 mol 
C)  0.500 mol 
D)  0.750 mol 
E)  1.00 mol

Question 11

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. 
A)  0.362 m 
B)  0.498 m 
C)  2.01 m 
D)  2.76 m 
E)  None of these choices are correct.

Question 12

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. 
A)  0.732 M 
B)  0.865 M 
C)  2.66 M 
D)  4.97 M 
E)  None of these choices are correct.

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

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°C 
A)  3.3°C 
B)  1.1°C 
C)  0.0°C 
D)  -1.1°C 
E)  -3.3°C

Question 15

Hexachlorophene is used as a disinfectant in germicidal soaps. What mass of hexachlorophene (   = 406.9 g/mol) must be added to 125 g of chloroform to give a solution with a boiling point of 62.60°C? Kb = 3.63°C/m, boiling point of pure chloroform = 61.70°C

Accepted Answer

A)  12.6 g 
B)  17.2 g 
C)  31.0 g 
D)  34.4 g 
E)  101 g 
A)  12.6 g 
B)  17.2 g 
C)  31.0 g 
D)  34.4 g 
E)  101 g

Question 16

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

Accepted Answer

A) True 
 B)False

Question 17

The solubility of the oxidizing agent potassium permanganate is 7.1 g per 100.0 g of water at 25°C. What is the mole fraction of potassium permanganate in this solution?

Accepted Answer

A)  0.0080 
B)  0.0086 
C)  0.066 
D)  0.45 
E)  0.48 
A)  0.0080 
B)  0.0086 
C)  0.066 
D)  0.45 
E)  0.48

Question 18

From the following list of aqueous solutions and water, select the one with the lowest freezing point.

Accepted Answer

A)  0.75 m (NH4)3PO4 
B)  1.0 m CaSO4 
C)  1.0 m LiClO4 
D)  1.5 m CH3OH, methyl alcohol 
E)  pure water 
A)  0.75 m (NH4)3PO4 
B)  1.0 m CaSO4 
C)  1.0 m LiClO4 
D)  1.5 m CH3OH, methyl alcohol 
E)  pure water

Question 19

A 0.89% (w/v) sodium chloride solution is referred to as physiological saline solution because it has the same concentration of salts as human blood. What is the molarity of a physiological saline solution?

Accepted Answer

A)  0.0028 M 
B)  0.015 M 
C)  0.15 M 
D)  0.30 M 
E)  0.35 M 
A)  0.0028 M 
B)  0.015 M 
C)  0.15 M 
D)  0.30 M 
E)  0.35 M

Question 20

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 m 
A)  0.0342 m 
B)  0.0855 m 
C)  0.222 m 
D)  0.444 m 
E)  1.68 m

Exam 13: The Properties of Mixtures Solutions and Colloids

All solutions are mixtures.

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?

Which of the following aqueous solutions will have the lowest osmotic pressure?

Under physiological conditions, amino acids in solution carry

Barbiturates are synthetic drugs used as sedatives and hypnotics. Barbital ( = 184.2 g/mol) is one of the simplest of these drugs. What is the boiling point of a solution prepared by dissolving 42.5 g of barbital in 825 g of acetic acid? Kb = 3.07°C/m; boiling point of pure acetic acid = 117.9°C

Calculate the freezing point of a solution made by dissolving 3.50 g of potassium chloride ( = 74.55 g/mol) in 100.0 g of water. Assume ideal behavior for the solution; Kf = 1.86°C/m.

Which of the following pairs of ions is arranged so that the ion with the smaller charge density is listed first?

A 0.100 m MgSO4 solution has a freezing point of -0.23°C. What is the van't Hoff factor for this solution? Kf = 1.86°C/m

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

What is the molality of a solution prepared by dissolving 86.9 g of diethyl ether, C4H10O, in 425 g of benzene, C6H6?

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.

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

Determine the freezing point of a solution that contains 0.31 mol of sucrose in 175 g of water. Kf = 1.86°C/m

Hexachlorophene is used as a disinfectant in germicidal soaps. What mass of hexachlorophene ( = 406.9 g/mol) must be added to 125 g of chloroform to give a solution with a boiling point of 62.60°C? Kb = 3.63°C/m, boiling point of pure chloroform = 61.70°C

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

The solubility of the oxidizing agent potassium permanganate is 7.1 g per 100.0 g of water at 25°C. What is the mole fraction of potassium permanganate in this solution?

From the following list of aqueous solutions and water, select the one with the lowest freezing point.

A 0.89% (w/v) sodium chloride solution is referred to as physiological saline solution because it has the same concentration of salts as human blood. What is the molarity of a physiological saline solution?

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?

Keys to Studying Chemistry Definitions, Units, and Problem Solving

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces Liquids, Solids, and Phase Changes

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics Rates and Mechanisms of Chemical Reactions

Equilibrium the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics Entropy, Free Energy, and Reaction Direction

Electrochemistry Chemical Change and Electrical Work

The Elements in Nature and Industry

Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

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?

Barbiturates are synthetic drugs used as sedatives and hypnotics. Barbital ( = 184.2 g/mol) is one of the simplest of these drugs. What is the boiling point of a solution prepared by dissolving 42.5 g of barbital in 825 g of acetic acid? K_b = 3.07°C/m; boiling point of pure acetic acid = 117.9°C

Calculate the freezing point of a solution made by dissolving 3.50 g of potassium chloride ( = 74.55 g/mol) in 100.0 g of water. Assume ideal behavior for the solution; K_f = 1.86°C/m.

A 0.100 m MgSO4 solution has a freezing point of -0.23°C. What is the van't Hoff factor for this solution? K_f = 1.86°C/m

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

What is the molality of a solution prepared by dissolving 86.9 g of diethyl ether, C₄H₁₀O, in 425 g of benzene, C₆H₆?

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.

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

Hexachlorophene is used as a disinfectant in germicidal soaps. What mass of hexachlorophene ( = 406.9 g/mol) must be added to 125 g of chloroform to give a solution with a boiling point of 62.60°C? K_b = 3.63°C/m, boiling point of pure chloroform = 61.70°C