Question 1

A solution component present in lesser quantity than the solvent is called ________.

Accepted Answer

A) a diluent 
B) an alloy 
C) a heterogeneous solid 
D) a solute 
E) a mixture 
A) a diluent 
B) an alloy 
C) a heterogeneous solid 
D) a solute 
E) a mixture

Question 2

What is the freezing point of a solution of 7.15 g MgCl2 in 100 g of water? 
Kf for water is

Accepted Answer

A) -0.140 °C 
B) -1.40 °C 
C) -2.80 °C 
D) -4.18 °C 
A) -0.140 °C 
B) -1.40 °C 
C) -2.80 °C 
D) -4.18 °C

Question 3

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 masses in au: 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 4

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 5

A KCl solution is prepared by dissolving 25.0 g KCl in 250.0 g of water at 25 °C.What is the vapour pressure of the solution if the vapour pressure of water at 25 °C is 23.76 mmHg?

Accepted Answer

A) 21.6 mmHg 
B) 22.7 mmHg 
C) 23.2 mmHg 
D) 24.9 mmHg 
A) 21.6 mmHg 
B) 22.7 mmHg 
C) 23.2 mmHg 
D) 24.9 mmHg

Question 6

What mass in grams of a molecular substance (molar mass = 50.0 g/mol)must be added to 500 g of water to produce a solution that boils at 101.56 °C? [Kb(water) = 0.512 °C m-1]

Accepted Answer

A) 76.2 g 
B) 150.0 g 
C) 100.0 g 
D) 30.0 g 
E) 152.4 g 
A) 76.2 g 
B) 150.0 g 
C) 100.0 g 
D) 30.0 g 
E) 152.4 g

Question 7

What is the mole fraction of I2 in a solution made by dissolving 55.6 g of I2 in 245 g of hexane,C6H14?

Accepted Answer

A) 0.0715 
B) 0.0770 
C) 0.133 
D) 0.154 
A) 0.0715 
B) 0.0770 
C) 0.133 
D) 0.154

Question 8

To make a 2.00 mol kg-1 solution,one could take 2.00 moles of solute and add:

Accepted Answer

A) 1.00 L of solvent 
B) 1.00 kg of solvent 
C) enough solvent to make 1.00 L of solution 
D) enough solvent to make 1.00 kg of solution 
A) 1.00 L of solvent 
B) 1.00 kg of solvent 
C) enough solvent to make 1.00 L of solution 
D) enough solvent to make 1.00 kg of solution

Question 9

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

Question 10

A saline solution begins to freeze at -1.13 °C.Express the concentration of NaCl in this solution in mass %.Kf for water is 1.86 °C m-1.

Accepted Answer

A) 3.48% 
B) 1.74% 
C) 0.870% 
D) 17.8% 
E) 8.90% 
A) 3.48% 
B) 1.74% 
C) 0.870% 
D) 17.8% 
E) 8.90%

Question 11

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 12

Colligative properties are similar in that they all:

Accepted Answer

A) are due to solvent chemical interactions 
B) depend on the number of solute particles in solution 
C) depend on the solvent 
D) have no effect on the properties of solution 
E) describe colloids 
A) are due to solvent chemical interactions 
B) depend on the number of solute particles in solution 
C) depend on the solvent 
D) have no effect on the properties of solution 
E) describe colloids

Question 13

Henry's Law constants for aqueous solutions at 25 °C are 8.20 × 10-7 m/mmHg for N2 and 1.62 × 10-6 m/mmHg for O2.Determine the solubility of nitrogen in water under an atmospheric pressure of 760 mmHg,assuming that air is 80% N2 and 20% O2.

Accepted Answer

A) 6.23 × 10-4 m 
B) 7.79 × 10-4 m 
C) 4.99 × 10-4 m 
D) 1.25 × 10-4 m 
E) 6.16 × 10-3 m 
A) 6.23 × 10-4 m 
B) 7.79 × 10-4 m 
C) 4.99 × 10-4 m 
D) 1.25 × 10-4 m 
E) 6.16 × 10-3 m

Question 14

0.25 mol of a nonvolatile,nonionic solute dissolved in 300 g of water (Kf = 1.86 °C m-1)will lower the freezing point how many degrees?

Accepted Answer

A) 0.65 °C 
B) 2.2 °C 
C) 0.14 °C 
D) 1.6 °C 
E) 3.2 °C 
A) 0.65 °C 
B) 2.2 °C 
C) 0.14 °C 
D) 1.6 °C 
E) 3.2 °C

Question 15

An aqueous solution containing 1.0 g ephedrine in 20.0 mL solution is said to be:

Accepted Answer

A) 5.0% ephedrine (mass/vol) 
B) 1.0% ephedrine (mass/vol) 
C) 0.50% ephedrine (mass/vol) 
D) 0.050% ephedrine (mass/vol) 
E) 20.0% ephedrine (mass/vol) 
A) 5.0% ephedrine (mass/vol) 
B) 1.0% ephedrine (mass/vol) 
C) 0.50% ephedrine (mass/vol) 
D) 0.050% ephedrine (mass/vol) 
E) 20.0% ephedrine (mass/vol)

Question 16

What is the molality of a glucose solution prepared by dissolving 18.0 g of glucose,C6H12O6,in 125.9 g of water?

Accepted Answer

A) 7.94 × 10-4 mol kg-1 
B) 0.143 mol kg-1 
C) 0.695 mol kg-1 
D) 0.794 mol kg-1 
A) 7.94 × 10-4 mol kg-1 
B) 0.143 mol kg-1 
C) 0.695 mol kg-1 
D) 0.794 mol kg-1

Question 17

85.0 grams of potassium bromide are to be used to produce a 0.300 M solution.What will be the total volume of this solution?

Accepted Answer

A) 2.38 L 
B) 2.83 L 
C) 283 L 
D) 0.214 L 
E) 0.420 L 
A) 2.38 L 
B) 2.83 L 
C) 283 L 
D) 0.214 L 
E) 0.420 L

Question 18

A solution of nonvolatile solute has an osmotic pressure of 141 mmHg at 25 °C.What is the molarity of the solution?

Accepted Answer

A) 0.00759 M 
B) 5.76 M 
C) 0.0904 M 
D) 0.0339 M 
E) 0.174 M 
A) 0.00759 M 
B) 5.76 M 
C) 0.0904 M 
D) 0.0339 M 
E) 0.174 M

Question 19

Which of the following material-colloid type combinations is INCORRECT?

Accepted Answer

A) mayonnaise - emulsion 
B) whipped cream - foam 
C) smoke - aerosol 
D) lava - solid foam 
E) opal - solid solution 
A) mayonnaise - emulsion 
B) whipped cream - foam 
C) smoke - aerosol 
D) lava - solid foam 
E) opal - solid solution

Question 20

Predict the freezing point of a solution prepared by dissolving 8.9 g MgCl2 in 98 g H2O.Kf for water is 1.86 °C m-1.

Accepted Answer

A) 3.5 °C 
B) -3.5 °C 
C) 5.3 °C 
D) -5.3 °C 
E) -0.51 °C 
A) 3.5 °C 
B) -3.5 °C 
C) 5.3 °C 
D) -5.3 °C 
E) -0.51 °C

Exam 14: Solutions and Their Physical Properties

A solution component present in lesser quantity than the solvent is called ________.

What is the freezing point of a solution of 7.15 g MgCl2 in 100 g of water? Kf for water is

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 masses in au: H = 1.0,O = 16.0,S = 32.1,Mg = 24.3)

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.

A KCl solution is prepared by dissolving 25.0 g KCl in 250.0 g of water at 25 °C.What is the vapour pressure of the solution if the vapour pressure of water at 25 °C is 23.76 mmHg?

What mass in grams of a molecular substance (molar mass = 50.0 g/mol)must be added to 500 g of water to produce a solution that boils at 101.56 °C? [Kb(water) = 0.512 °C m-1]

What is the mole fraction of I2 in a solution made by dissolving 55.6 g of I2 in 245 g of hexane,C6H14?

To make a 2.00 mol kg-1 solution,one could take 2.00 moles of solute and add:

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

A saline solution begins to freeze at -1.13 °C.Express the concentration of NaCl in this solution in mass %.Kf for water is 1.86 °C m-1.

Colligative properties are similar in that they all:

Henry's Law constants for aqueous solutions at 25 °C are 8.20 × 10-7 m/mmHg for N2 and 1.62 × 10-6 m/mmHg for O2.Determine the solubility of nitrogen in water under an atmospheric pressure of 760 mmHg,assuming that air is 80% N2 and 20% O2.

0.25 mol of a nonvolatile,nonionic solute dissolved in 300 g of water (Kf = 1.86 °C m-1)will lower the freezing point how many degrees?

An aqueous solution containing 1.0 g ephedrine in 20.0 mL solution is said to be:

What is the molality of a glucose solution prepared by dissolving 18.0 g of glucose,C6H12O6,in 125.9 g of water?

85.0 grams of potassium bromide are to be used to produce a 0.300 M solution.What will be the total volume of this solution?

A solution of nonvolatile solute has an osmotic pressure of 141 mmHg at 25 °C.What is the molarity of the solution?

Which of the following material-colloid type combinations is INCORRECT?

Predict the freezing point of a solution prepared by dissolving 8.9 g MgCl2 in 98 g H2O.Kf for water is 1.86 °C m-1.

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: Valence Bond and Molecular Orbital Theories

Intermolecular Forces: Liquids and Solids

Spontaneous Change: Entropy and Gibbs Energy

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acidbase Equilibria

Solubility and Complex-Ion Equilibria

Electrochemistry

Chemical Kinetics

Chemistry of the Main-Group Elements I: Groups 1,2,13,and 14

Chemistry of the Main-Group Elements Ii: Groups 18,17,16,15,and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

What is the freezing point of a solution of 7.15 g MgCl₂ in 100 g of water? K_f for water is

What mass in grams of a molecular substance (molar mass = 50.0 g/mol)must be added to 500 g of water to produce a solution that boils at 101.56 °C? [K_b(water) = 0.512 °C m^-1]

What is the mole fraction of I₂ in a solution made by dissolving 55.6 g of I₂ in 245 g of hexane,C₆H₁₄?

To make a 2.00 mol kg^-1 solution,one could take 2.00 moles of solute and add:

A saline solution begins to freeze at -1.13 °C.Express the concentration of NaCl in this solution in mass %.K_f for water is 1.86 °C m^-1.

Henry's Law constants for aqueous solutions at 25 °C are 8.20 × 10^-7 m/mmHg for N₂ and 1.62 × 10^-6 m/mmHg for O₂.Determine the solubility of nitrogen in water under an atmospheric pressure of 760 mmHg,assuming that air is 80% N₂ and 20% O₂.

0.25 mol of a nonvolatile,nonionic solute dissolved in 300 g of water (K_f = 1.86 °C m^-1)will lower the freezing point how many degrees?

What is the molality of a glucose solution prepared by dissolving 18.0 g of glucose,C₆H₁₂O₆,in 125.9 g of water?

Predict the freezing point of a solution prepared by dissolving 8.9 g MgCl₂ in 98 g H₂O.K_f for water is 1.86 °C m^-1.