Question 1

The concentration unit used to calculate boiling point elevation is ________.

Accepted Answer

A)  molarity 
B)  solubility 
C)  molality 
D)  mole fraction 
E)  weight fraction 
A)  molarity 
B)  solubility 
C)  molality 
D)  mole fraction 
E)  weight fraction

Question 2

Which of the following compounds has the highest solubility?

Accepted Answer

A)  CaCl2 
B)  SrI2 
C)  CaI2 
D)  MgI2 
E)  CaBr2 
A)  CaCl2 
B)  SrI2 
C)  CaI2 
D)  MgI2 
E)  CaBr2

Question 3

Which of the following is a true solution with particles less than 1 nm in size?

Accepted Answer

A)  calcium chloride in water. 
B)  oil in water. 
C)  whipped cream. 
D)  milk. 
A)  calcium chloride in water. 
B)  oil in water. 
C)  whipped cream. 
D)  milk.

Question 4

Osmotic pressure is a colligative property.

Accepted Answer

A) True 
 B)False

Question 5

An aqueous solution contains 64.0 g of ethanol (C2H5OH) in 122.0 g of solution. What is the mole fraction of ethanol in the solution?

Accepted Answer

A)  0.301 
B)  0.432 
C)  0.205 
D)  0.698 
E)  0.317 
A)  0.301 
B)  0.432 
C)  0.205 
D)  0.698 
E)  0.317

Question 6

The solubility of CO in water at 0°C and 1 atm CO pressure is 0.0354 mg of CO in 1 mL of water. Calculate the molarity of aqueous CO solution at 2 atm CO pressure.

Accepted Answer

A)  1.58 × 10-3 M 
B)  6.32 × 10-2 M 
C)  1.59 M 
D)  2.53 × 10-3 M 
E)  3.16 × 10-3 M 
A)  1.58 × 10-3 M 
B)  6.32 × 10-2 M 
C)  1.59 M 
D)  2.53 × 10-3 M 
E)  3.16 × 10-3 M

Question 7

The concentration unit used in determining freezing point depression and boiling point elevation is ________.

Accepted Answer

A)  molality 
B)  mole fraction 
C)  normality 
D)  molarity 
E)  weight fraction 
A)  molality 
B)  mole fraction 
C)  normality 
D)  molarity 
E)  weight fraction

Question 8

Which of the following combination of dispersed phase in a dispersion medium with the colloid type is INCORRECT?

Accepted Answer

A)  Solid in liquid is a sol. 
B)  Solid in solid is a solid sol. 
C)  Solid in gas is an aerosol. 
D)  Liquid in solid is a solid foam. 
E)  Liquid in gas is an aerosol. 
A)  Solid in liquid is a sol. 
B)  Solid in solid is a solid sol. 
C)  Solid in gas is an aerosol. 
D)  Liquid in solid is a solid foam. 
E)  Liquid in gas is an aerosol.

Question 9

A membrane permeable to water but not to glucose (C6H12O6) separates two aqueous solutions. Solution A is 0.156 M glucose and solution B contains pure water. There will be a net flow of water molecules across the membrane from solution B to solution A until equilibrium is established across the membrane. What pressure would have to be applied to solution A to prevent osmosis flow across the membrane at 25°C?

Accepted Answer

A)  1.00 atm 
B)  3.82 atm 
C)  0.320 atm 
D)  1.91 atm 
E)  0.382 atm 
A)  1.00 atm 
B)  3.82 atm 
C)  0.320 atm 
D)  1.91 atm 
E)  0.382 atm

Question 10

We wish to lower the freezing point of the water in an automobile radiator to -40°C. The total mass of water present is 12.0 kg. For which one of the following compounds would we have to use the greatest mass of solute to achieve this? You may assume that Kf for water = -1.86°C/m and that all ionizable solutes are completely ionized with unit activity even at this high concentration.

Accepted Answer

A)  AlF3 (M.W. = 84 g/mol) 
B)  C2H5OH (M.W. = 46 g/mol) 
C)  CaCl2 (M.W. = 111 g/mol) 
D)  C3H6(OH)2 (M.W. = 76 g/mol) 
E)  NaCl (M.W. = 58.5 g/mol) 
A)  AlF3 (M.W. = 84 g/mol) 
B)  C2H5OH (M.W. = 46 g/mol) 
C)  CaCl2 (M.W. = 111 g/mol) 
D)  C3H6(OH)2 (M.W. = 76 g/mol) 
E)  NaCl (M.W. = 58.5 g/mol)

Question 11

How many moles of ethylene glycol must be dissolved in 500 g of water (Kf = 1.86) to lower the freezing point to -5.00°C?

Accepted Answer

A)  18.6 mol 
B)  2.69 mol 
C)  0.268 mol 
D)  3.73 mol 
E)  1.34 mol 
A)  18.6 mol 
B)  2.69 mol 
C)  0.268 mol 
D)  3.73 mol 
E)  1.34 mol

Question 12

An azeotropic mixture is a:

Accepted Answer

A)  mixture of two or more substances where boiling point cannot be determined. 
B)  solution of two or more substances present in the same amounts in the liquid phase. 
C)  liquid mixture of two or more substances in which the vapor has the same composition as the liquid. 
D)  liquid mixture of two or more substances linked by azide functional groups. 
E)  solution of two or more substances that cannot be made to freeze. 
A)  mixture of two or more substances where boiling point cannot be determined. 
B)  solution of two or more substances present in the same amounts in the liquid phase. 
C)  liquid mixture of two or more substances in which the vapor has the same composition as the liquid. 
D)  liquid mixture of two or more substances linked by azide functional groups. 
E)  solution of two or more substances that cannot be made to freeze.

Question 13

Which of the following is a non-colligative property?

Accepted Answer

A)  freezing point depression 
B)  boiling point elevation 
C)  osmotic pressure 
D)  solubility 
E)  vapour pressure lowering 
A)  freezing point depression 
B)  boiling point elevation 
C)  osmotic pressure 
D)  solubility 
E)  vapour pressure lowering

Question 14

The concentration unit used in Raoult's Law calculations is ________.

Accepted Answer

A)  mole fraction 
B)  percent by weight 
C)  molarity 
D)  molality 
E)  grams per L 
A)  mole fraction 
B)  percent by weight 
C)  molarity 
D)  molality 
E)  grams per L

Question 15

138.0 grams of ethanol (46.0 g/mol), 99.0 grams of water (18.0 g/mol), and 80.0 grams of methanol (32.0 g/mol) comprise a solution. What is the mole fraction of methanol present in the solution?

Accepted Answer

A)  0.273 
B)  0.338 
C)  0.294 
D)  0.252 
E)  0.227 
A)  0.273 
B)  0.338 
C)  0.294 
D)  0.252 
E)  0.227

Question 16

A 1.38 M solution of nitric acid (63. g/mol) in water (18.0 g/mol) has a density of 1.04 g/mL. What is the mole fraction of nitric acid in the solution?

Accepted Answer

A)  0.0254 
B)  0.0239 
C)  0.0261 
D)  0.0228 
E)  0.0233 
A)  0.0254 
B)  0.0239 
C)  0.0261 
D)  0.0228 
E)  0.0233

Question 17

Nitrogen gas has a Henry's law constant k = 6.3 × 10-4 M/atm at 25°C. The "bends" in divers results from bubbles of N2(g) being rapidly released from body fluids when a diver ascends to the surface too quickly. Which of the following would be a good substitute for N2(g) in order to make the "bends" less severe?

Accepted Answer

A)  He(g), k = 3.7 × 10-4 M/atm 
B)  Ar(g), k = 1.5 × 10-3 M/atm 
C)  H2(g), k = 8.1 × 10-4 M/atm 
D)  CO2(g), k = 3.4 × 10-2 M/atm 
A)  He(g), k = 3.7 × 10-4 M/atm 
B)  Ar(g), k = 1.5 × 10-3 M/atm 
C)  H2(g), k = 8.1 × 10-4 M/atm 
D)  CO2(g), k = 3.4 × 10-2 M/atm

Question 18

Adding a solute to a solvent lowers the freezing point of the solution compared to the pure solvent.

Accepted Answer

A) True 
 B)False

Question 19

A magnesium sulfate heptahydrate solution, which is 18.00% by weight in the anhydrous compound, has a density at 20°C of 1.20 g/mL. What is the molarity of the anhydrous compound in the solution? (Atomic weights: H = 1.0, O = 16.0, S = 32.1, Mg = 24.3)

Accepted Answer

A)  5.54 M 
B)  1.79 M 
C)  1.82 M 
D)  1.25 M 
E)  1.49 M 
A)  5.54 M 
B)  1.79 M 
C)  1.82 M 
D)  1.25 M 
E)  1.49 M

Question 20

Commercial nitric acid is 16.0 M HNO3(aq) and has a density of 1.42 g/mL. What is the mole fraction of HNO3 in this solution?

Accepted Answer

A)  0.412 
B)  0.699 
C)  0.589 
D)  0.704 
A)  0.412 
B)  0.699 
C)  0.589 
D)  0.704

Exam 13: Solutions and Their Physical Properties

The concentration unit used to calculate boiling point elevation is ________.

Which of the following compounds has the highest solubility?

Which of the following is a true solution with particles less than 1 nm in size?

Osmotic pressure is a colligative property.

An aqueous solution contains 64.0 g of ethanol (C2H5OH) in 122.0 g of solution. What is the mole fraction of ethanol in the solution?

The solubility of CO in water at 0°C and 1 atm CO pressure is 0.0354 mg of CO in 1 mL of water. Calculate the molarity of aqueous CO solution at 2 atm CO pressure.

The concentration unit used in determining freezing point depression and boiling point elevation is ________.

Which of the following combination of dispersed phase in a dispersion medium with the colloid type is INCORRECT?

How many moles of ethylene glycol must be dissolved in 500 g of water (Kf = 1.86) to lower the freezing point to -5.00°C?

An azeotropic mixture is a:

Which of the following is a non-colligative property?

The concentration unit used in Raoult's Law calculations is ________.

138.0 grams of ethanol (46.0 g/mol), 99.0 grams of water (18.0 g/mol), and 80.0 grams of methanol (32.0 g/mol) comprise a solution. What is the mole fraction of methanol present in the solution?

A 1.38 M solution of nitric acid (63. g/mol) in water (18.0 g/mol) has a density of 1.04 g/mL. What is the mole fraction of nitric acid in the solution?

Adding a solute to a solvent lowers the freezing point of the solution compared to the pure solvent.

A magnesium sulfate heptahydrate solution, which is 18.00% by weight in the anhydrous compound, has a density at 20°C of 1.20 g/mL. What is the molarity of the anhydrous compound in the solution? (Atomic weights: H = 1.0, O = 16.0, S = 32.1, Mg = 24.3)

Commercial nitric acid is 16.0 M HNO3(aq) and has a density of 1.42 g/mL. What is the mole fraction of HNO3 in this solution?

Matter - Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding I: Basic Concepts

Chemical Bonding II: Additional Aspects

Intermolecular Forces: Liquids and Solids

Chemical Kinetics

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Spontaneous Change: Entropy and Free Energy

Electrochemistry

Main Group Elements I: Groups 1, 2, 13, and 14

Main Group Elements II: Groups 18, 17, 16, 15, and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry 1-41

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

An aqueous solution contains 64.0 g of ethanol (C₂H₅OH) in 122.0 g of solution. What is the mole fraction of ethanol in the solution?

Commercial nitric acid is 16.0 M HNO₃(aq) and has a density of 1.42 g/mL. What is the mole fraction of HNO₃ in this solution?