Question 1

A solution is prepared by adding 1.43 mol of KCl to 889 g of water. The concentration of KCl is
Molal.

Accepted Answer

A)  622 
B)  0.622 
C)  1.61 × 10- 3 
D)  1.27 × 103 
E)  1.61 
A)  622 
B)  0.622 
C)  1.61 × 10- 3 
D)  1.27 × 103 
E)  1.61

Question 2

The vapor pressure of pure water at 25 °C is 23.8 torr. Determine the vapor pressure (torr) of water at 25 °C above a solution prepared by dissolving 35 g of urea (a nonvolatile, non- electrolyte, MW =60.0 g/mol) in 75 g of water.

Accepted Answer

A)  0.88 
B)  27 
C)  21 
D)  3.3 
E)  2.9 
A)  0.88 
B)  27 
C)  21 
D)  3.3 
E)  2.9

Question 3

Hydrophobic colloids .

Accepted Answer

A)  can be stabilized by coagulation 
B)  can be stabilized by adsorption of ions 
C)  will separate into two phases if they are stabilized 
D)  are those that do not contain water 
E)  are those that contain water 
A)  can be stabilized by coagulation 
B)  can be stabilized by adsorption of ions 
C)  will separate into two phases if they are stabilized 
D)  are those that do not contain water 
E)  are those that contain water

Question 4

An unsaturated solution is one that _.

Accepted Answer

A)  contains the maximum concentration of solute possible, and is in equilibrium with undissolved solute 
B)  has a concentration lower than the solubility 
C)  contains no solute 
D)  has no double bonds 
E)  contains more dissolved solute than the solubility allows 
A)  contains the maximum concentration of solute possible, and is in equilibrium with undissolved solute 
B)  has a concentration lower than the solubility 
C)  contains no solute 
D)  has no double bonds 
E)  contains more dissolved solute than the solubility allows

Question 5

A supersaturated solution _ _.

Accepted Answer

A)  is one with a higher concentration than the solubility 
B)  exists only in theory and cannot actually be prepared 
C)  is one that has been heated 
D)  must be in contact with undissolved solid 
E)  is one with more than one solute 
A)  is one with a higher concentration than the solubility 
B)  exists only in theory and cannot actually be prepared 
C)  is one that has been heated 
D)  must be in contact with undissolved solid 
E)  is one with more than one solute

Question 6

The ideal value of i (van't Hoff factor) for (NH4)3PO4.

Accepted Answer

A)  5 
B)  1 
C)  4 
D)  3 
E)  2 
A)  5 
B)  1 
C)  4 
D)  3 
E)  2

Question 7

In a saturated solution of a salt in water, .

Accepted Answer

A)  seed crystal addition may cause massive crystallization 
B)  the rate of crystallization > the rate of dissolution 
C)  addition of more water causes massive crystallization 
D)  the rate of dissolution > the rate of crystallization 
E)  the rate of crystallization = the rate of dissolution 
A)  seed crystal addition may cause massive crystallization 
B)  the rate of crystallization > the rate of dissolution 
C)  addition of more water causes massive crystallization 
D)  the rate of dissolution > the rate of crystallization 
E)  the rate of crystallization = the rate of dissolution

Question 8

Which one of the following substances would be the most soluble in CCl4?

Accepted Answer

A)  C10H22 
B)  CH3CH2OH 
C)  H2O 
D)  NaCl 
E)  NH3 
A)  C10H22 
B)  CH3CH2OH 
C)  H2O 
D)  NaCl 
E)  NH3

Question 9

The phrase "like dissolves like" refers to the fact that _.

Accepted Answer

A)  gases can only dissolve other gases 
B)  condensed phases can only dissolve other condensed phases 
C)  polar solvents dissolve polar solutes and nonpolar solvents dissolve nonpolar solutes 
D)  polar solvents dissolve nonpolar solutes and vice versa 
E)  solvents can only dissolve solutes of similar molar mass 
A)  gases can only dissolve other gases 
B)  condensed phases can only dissolve other condensed phases 
C)  polar solvents dissolve polar solutes and nonpolar solvents dissolve nonpolar solutes 
D)  polar solvents dissolve nonpolar solutes and vice versa 
E)  solvents can only dissolve solutes of similar molar mass

Question 10

A solution is prepared by dissolving 23.7 g of CaCl2 in 375 g of water. The density of the resulting solution is 1.05 g/mL. The concentration of Cl- in this solution is _ M.

Accepted Answer

A)  1.20 
B)  6.64 × 10- 2 
C)  1.12 
D)  0.214 
E)  0.562 
A)  1.20 
B)  6.64 × 10- 2 
C)  1.12 
D)  0.214 
E)  0.562

Question 11

At 20°C, an aqueous solution that is 24.00% by mass in ammonium chloride has a density of 1.0674 g/mL. What is the molarity of ammonium chloride in the solution? The formula weight of NH4Cl is 53.50 g/mol.

Accepted Answer

A)  22.5 
B)  4.79 
C)  0.479 
D)  5.90 
E)  0.0445 
A)  22.5 
B)  4.79 
C)  0.479 
D)  5.90 
E)  0.0445

Question 12

A solution is prepared by dissolving 15.0 g of NH3 in 250 g of water. The density of the resulting solution is 0.974 g/mL. The mole fraction of NH3 in the solution is _ _.

Accepted Answer

A)  0.0597 
B)  0.922 
C)  0.940 
D)  0.0640 
E)  16.8 
A)  0.0597 
B)  0.922 
C)  0.940 
D)  0.0640 
E)  16.8

Question 13

Hydration is a specific example of the phenomenon known generally as .

Accepted Answer

A)  condensation 
B)  disordering 
C)  dilution 
D)  salutation 
E)  solvation 
A)  condensation 
B)  disordering 
C)  dilution 
D)  salutation 
E)  solvation

Question 14

The concentration of nitrate ion in a solution that contains 0.900 M aluminum nitrate is M.

Accepted Answer

A)  1.80 
B)  0.450 
C)  0.300 
D)  0.900 
E)  2.70 
A)  1.80 
B)  0.450 
C)  0.300 
D)  0.900 
E)  2.70

Question 15

The concentration (M) of HCl in a solution prepared by dissolving 5.5 g of HCl in 200 g of C2H6O is M. The density of the solution is 0.79 g/mL.

Accepted Answer

A)  0.58 
B)  21 
C)  0.93 
D)  6.0 × 10- 4  
E)  1.72 
A)  0.58 
B)  21 
C)  0.93 
D)  6.0 × 10- 4  
E)  1.72

Question 16

On a clear day at sea level, with a temperature of 25 °C, the partial pressure of N2 in air is 0.78 atm and the concentration of nitrogen in water is 5.3 × 10- 4 M. When the partial pressure of N2 is
Atm, the concentration in water is 1.1 × 10- 3 M.

Accepted Answer

A)  1.6 atm 
B)  0.78 atm 
C)  2.1 atm 
D)  0.63 atm 
E)  1.0 atm 
A)  1.6 atm 
B)  0.78 atm 
C)  2.1 atm 
D)  0.63 atm 
E)  1.0 atm

Question 17

The mole fraction of He in a gaseous solution prepared from 4.0 g of He, 6.5 g of Ar, and 10.0 g of Ne is .

Accepted Answer

A)  1.5 
B)  0.61 
C)  0.86 
D)  0.11 
E)  0.20 
A)  1.5 
B)  0.61 
C)  0.86 
D)  0.11 
E)  0.20

Question 18

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

Accepted Answer

A)  pure H2O 
B)  aqueous FeI3 (0.24 m) 
C)  aqueous sucrose (0.60 m) 
D)  aqueous glucose (0.60 m) 
E)  aqueous KF (0.50 m) 
A)  pure H2O 
B)  aqueous FeI3 (0.24 m) 
C)  aqueous sucrose (0.60 m) 
D)  aqueous glucose (0.60 m) 
E)  aqueous KF (0.50 m)

Question 19

A solution is prepared by dissolving 0.60 g of nicotine (a nonelectrolyte) in water to make 12 mL of solution. The osmotic pressure of the solution is 7.55 atm at 25 °C. The molecular weight of nicotine is g/mol.

Accepted Answer

A)  43 
B)  0.60 
C)  160 
D)  28 
E)  50 
A)  43 
B)  0.60 
C)  160 
D)  28 
E)  50

Question 20

A 0.100 m solution of which one of the following solutes will have the lowest vapor pressure?

Accepted Answer

A)  Ca(ClO4)2  
B)  Al(ClO4)3  
C)  KClO4  
D)  sucrose 
E)  NaCl 
A)  Ca(ClO4)2  
B)  Al(ClO4)3  
C)  KClO4  
D)  sucrose 
E)  NaCl

Exam 13: Properties of Solutions

A solution is prepared by adding 1.43 mol of KCl to 889 g of water. The concentration of KCl is Molal.

The vapor pressure of pure water at 25 °C is 23.8 torr. Determine the vapor pressure (torr) of water at 25 °C above a solution prepared by dissolving 35 g of urea (a nonvolatile, non- electrolyte, MW =60.0 g/mol) in 75 g of water.

Hydrophobic colloids .

An unsaturated solution is one that _.

A supersaturated solution _ _.

The ideal value of i (van't Hoff factor) for (NH4)3PO4.

In a saturated solution of a salt in water, .

Which one of the following substances would be the most soluble in CCl4?

The phrase "like dissolves like" refers to the fact that _.

A solution is prepared by dissolving 23.7 g of CaCl2 in 375 g of water. The density of the resulting solution is 1.05 g/mL. The concentration of Cl- in this solution is _ M.

At 20°C, an aqueous solution that is 24.00% by mass in ammonium chloride has a density of 1.0674 g/mL. What is the molarity of ammonium chloride in the solution? The formula weight of NH4Cl is 53.50 g/mol.

A solution is prepared by dissolving 15.0 g of NH3 in 250 g of water. The density of the resulting solution is 0.974 g/mL. The mole fraction of NH3 in the solution is _ _.

Hydration is a specific example of the phenomenon known generally as .

The concentration of nitrate ion in a solution that contains 0.900 M aluminum nitrate is M.

The concentration (M) of HCl in a solution prepared by dissolving 5.5 g of HCl in 200 g of C2H6O is M. The density of the solution is 0.79 g/mL.

On a clear day at sea level, with a temperature of 25 °C, the partial pressure of N2 in air is 0.78 atm and the concentration of nitrogen in water is 5.3 × 10- 4 M. When the partial pressure of N2 is Atm, the concentration in water is 1.1 × 10- 3 M.

The mole fraction of He in a gaseous solution prepared from 4.0 g of He, 6.5 g of Ar, and 10.0 g of Ne is .

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

A solution is prepared by dissolving 0.60 g of nicotine (a nonelectrolyte) in water to make 12 mL of solution. The osmotic pressure of the solution is 7.55 atm at 25 °C. The molecular weight of nicotine is g/mol.

A 0.100 m solution of which one of the following solutes will have the lowest vapor pressure?

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Gases

Intermolecular Forces, Liquids, and Solids

Modern Materials

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Chemistry of Coordination Compounds

The Chemistry of Life: Organic and Biological Chemistry

Filters

The ideal value of i (van't Hoff factor) for (NH₄)₃PO₄.

Which one of the following substances would be the most soluble in CCl₄?

A solution is prepared by dissolving 23.7 g of CaCl₂in 375 g of water. The density of the resulting solution is 1.05 g/mL. The concentration of Cl^-in this solution is _ M.

At 20°C, an aqueous solution that is 24.00% by mass in ammonium chloride has a density of 1.0674 g/mL. What is the molarity of ammonium chloride in the solution? The formula weight of NH₄Cl is 53.50 g/mol.

A solution is prepared by dissolving 15.0 g of NH₃in 250 g of water. The density of the resulting solution is 0.974 g/mL. The mole fraction of NH₃in the solution is _ _.

The concentration (M) of HCl in a solution prepared by dissolving 5.5 g of HCl in 200 g of C₂H₆O is M. The density of the solution is 0.79 g/mL.

On a clear day at sea level, with a temperature of 25 °C, the partial pressure of N₂in air is 0.78 atm and the concentration of nitrogen in water is 5.3 × 10^-⁴M. When the partial pressure of N₂is Atm, the concentration in water is 1.1 × 10^-³M.