Question 1

What is the freezing point of a 0.19 m solution of glucose,C6H12O6,in water? (Kf for water is 1.858°C/m.)

Accepted Answer

A) 0.18°C 
B) 0.35°C 
C) -0.35°C 
D) -0.18°C 
E) -0.71°C 
A) 0.18°C 
B) 0.35°C 
C) -0.35°C 
D) -0.18°C 
E) -0.71°C

Question 2

Which of the following favor(s)the solubility of an ionic solid in a liquid solvent?

Accepted Answer

A) a small magnitude of the lattice energy of the solute 
B) a large magnitude of the solvation energy of the ions 
C) a large polarity of the solvent 
D) all of the above 
E) none of the above 
A) a small magnitude of the lattice energy of the solute 
B) a large magnitude of the solvation energy of the ions 
C) a large polarity of the solvent 
D) all of the above 
E) none of the above

Question 3

The solubility of a gas in a liquid can always be increased by

Accepted Answer

A) decreasing the pressure of the gas above the solvent. 
B) increasing the pressure of the gas above the solvent. 
C) increasing the temperature of the solvent. 
D) decreasing the polarity of the solvent. 
E) decreasing the temperature of the gas above the solvent. 
A) decreasing the pressure of the gas above the solvent. 
B) increasing the pressure of the gas above the solvent. 
C) increasing the temperature of the solvent. 
D) decreasing the polarity of the solvent. 
E) decreasing the temperature of the gas above the solvent.

Question 4

A compound containing sulfur,nitrogen,and hydrogen has a composition of 86.6% sulfur,12.6% nitrogen,and 0.91% hydrogen by mass.A solution prepared by dissolving 3.130 g of this compound in 25.00 g of bromoform,CHBr3,produces a solution that freezes at -0.31°C.What is the molecular formula of the compound? (Kf for bromoform is 14.4°C/m,and pure bromoform has a freezing point of 7.8°C.)

Accepted Answer

A) SNH 
B) S3N2H2 
C) S6N2H2 
D) S3NH 
E) S2N2H2 
A) SNH 
B) S3N2H2 
C) S6N2H2 
D) S3NH 
E) S2N2H2

Question 5

A concentrated sodium hydroxide solution is 50.5% NaOH by mass and has a density of 1.53 g/mL at 25°C.What is the molarity of NaOH?

Accepted Answer

A) 19.3 M 
B) 0.0612 M 
C) 8.25 M 
D) 12.1 M 
E) 0.0825 M 
A) 19.3 M 
B) 0.0612 M 
C) 8.25 M 
D) 12.1 M 
E) 0.0825 M

Question 6

How does the solubility of a gas in a solvent depend on pressure and temperature?

Accepted Answer

A) Increasing the partial pressure of the gas while increasing the temperature increases the solubility of the gas. 
B) Decreasing the partial pressure of the gas while decreasing the temperature increases the solubility of the gas. 
C) Increasing the partial pressure of the gas while decreasing the temperature increases the solubility of the gas. 
D) Decreasing the partial pressure of the gas while increasing the temperature increases the solubility of the gas. 
E) Gas solubility is unaffected by pressure or temperature. 
A) Increasing the partial pressure of the gas while increasing the temperature increases the solubility of the gas. 
B) Decreasing the partial pressure of the gas while decreasing the temperature increases the solubility of the gas. 
C) Increasing the partial pressure of the gas while decreasing the temperature increases the solubility of the gas. 
D) Decreasing the partial pressure of the gas while increasing the temperature increases the solubility of the gas. 
E) Gas solubility is unaffected by pressure or temperature.

Question 7

A concentrated sulfuric acid solution is 65.0% H2SO4 by mass and has a density of 1.55 g/mL at 20°C.What is the mass of 9.00 L of the concentrated sulfuric acid solution?

Accepted Answer

A) 5.85 kg 
B) 9.00 kg 
C) 21.4 kg 
D) 3.77 kg 
E) 13.9 kg 
A) 5.85 kg 
B) 9.00 kg 
C) 21.4 kg 
D) 3.77 kg 
E) 13.9 kg

Question 8

What is the mass percent of an aqueous sodium hydroxide solution in which the molality of NaOH is 10.7 m? The density of the solution is 1.3311 g/mL.

Accepted Answer

A) 0.1% 
B) 68.9% 
C) 1.7% 
D) 30.0% 
E) 0.3% 
A) 0.1% 
B) 68.9% 
C) 1.7% 
D) 30.0% 
E) 0.3%

Question 9

A solute added to a solvent raises the boiling point of the solution because

Accepted Answer

A) the temperature to cause boiling must be great enough to boil not only the solvent but also the solute. 
B) the solute particles raise the solvent's vapor pressure,thus requiring a higher temperature to cause boiling. 
C) the solute increases the volume of the solution,and an increase in volume requires an increase in the temperature to reach the boiling point (derived from PV = nRT). 
D) the solute particles lower the solvent's vapor pressure,thus requiring a higher temperature to cause boiling. 
E) two of these explanations are correct. 
A) the temperature to cause boiling must be great enough to boil not only the solvent but also the solute. 
B) the solute particles raise the solvent's vapor pressure,thus requiring a higher temperature to cause boiling. 
C) the solute increases the volume of the solution,and an increase in volume requires an increase in the temperature to reach the boiling point (derived from PV = nRT). 
D) the solute particles lower the solvent's vapor pressure,thus requiring a higher temperature to cause boiling. 
E) two of these explanations are correct.

Question 10

A solution of CF3H in H2CO is most likely to

Accepted Answer

A) be ideal. 
B) not be ideal,but the deviations cannot be predicted. 
C) show negative deviations from Raoult's law. 
D) obey Raoult's law. 
E) show positive deviations from Raoult's law. 
A) be ideal. 
B) not be ideal,but the deviations cannot be predicted. 
C) show negative deviations from Raoult's law. 
D) obey Raoult's law. 
E) show positive deviations from Raoult's law.

Question 11

What type of colloid is formed when a liquid is dispersed in a gas?

Accepted Answer

A) foam 
B) emulsion 
C) aerosol 
D) sol 
E) gel 
A) foam 
B) emulsion 
C) aerosol 
D) sol 
E) gel

Question 12

Which of the following solutions would have the highest osmotic pressure?

Accepted Answer

A) 0.20 M MgCl2 
B) 0.20 M KBr 
C) 0.30 M C12H22O11 
D) 0.30 M C6H12O6 
E) 0.30 M CH3OH 
A) 0.20 M MgCl2 
B) 0.20 M KBr 
C) 0.30 M C12H22O11 
D) 0.30 M C6H12O6 
E) 0.30 M CH3OH

Question 13

A solution of two liquids,A and B,shows negative deviation from Raoult's law.This means that

Accepted Answer

A) the two liquids have a positive heat of solution. 
B) molecules of A interact more strongly with B than A molecules interact with A or B molecules interact with B. 
C) molecules of A interact strongly with other A-type molecules. 
D) molecules of A interact weakly,if at all,with B molecules. 
E) molecules of A hinder the strong interaction between B molecules. 
A) the two liquids have a positive heat of solution. 
B) molecules of A interact more strongly with B than A molecules interact with A or B molecules interact with B. 
C) molecules of A interact strongly with other A-type molecules. 
D) molecules of A interact weakly,if at all,with B molecules. 
E) molecules of A hinder the strong interaction between B molecules.

Question 14

A solution of water and a nonvolatile,nonionizing compound is placed in a tube with a semipermeable membrane on one side.The tube is placed in a beaker of pure water.What initial net effect will occur?

Accepted Answer

A) Nothing will move through the membrane either way. 
B) Water will flow from the beaker to the tube. 
C) Water will flow from the tube to the beaker. 
D) Equilibrium will be immediately established. 
E) The compound will pass through the membrane into the solution. 
A) Nothing will move through the membrane either way. 
B) Water will flow from the beaker to the tube. 
C) Water will flow from the tube to the beaker. 
D) Equilibrium will be immediately established. 
E) The compound will pass through the membrane into the solution.

Question 15

What is the mole fraction of water in a solution that contains 8.0 mol of ethanol (C2H5OH)and 1.6 mol of water?

Accepted Answer

A) 0.17 
B) 0.08 
C) 0.50 
D) 0.20 
E) 0.83 
A) 0.17 
B) 0.08 
C) 0.50 
D) 0.20 
E) 0.83

Question 16

Which of the following pure liquids is the best solvent for sodium fluoride?

Accepted Answer

A) CCl4(l) 
B) C2Cl6(l) 
C) HCl(l) 
D) BCl3(l) 
E) PCl5(l) 
A) CCl4(l) 
B) C2Cl6(l) 
C) HCl(l) 
D) BCl3(l) 
E) PCl5(l)

Question 17

A(n)_____ is a homogeneous mixture of two or more substances,consisting of ions or molecules.

Accepted Answer

A) ​solution 
B) ​suspension 
C) ​aerosol 
D) ​foam 
E) ​colloid 
A) ​solution 
B) ​suspension 
C) ​aerosol 
D) ​foam 
E) ​colloid

Question 18

When a liquid is dispersed in another liquid,the resulting colloid is called a(n)

Accepted Answer

A) emulsion. 
B) sol. 
C) foam. 
D) aerosol. 
E) gel. 
A) emulsion. 
B) sol. 
C) foam. 
D) aerosol. 
E) gel.

Question 19

What is the mass percent of an aqueous sodium hydroxide solution in which the molarity of NaOH is 9.98 M? The density of the solution is 1.33 g/mL.

Accepted Answer

A) 0.1% 
B) 30.0% 
C) 13.2% 
D) 1.7% 
E) 68.9% 
A) 0.1% 
B) 30.0% 
C) 13.2% 
D) 1.7% 
E) 68.9%

Question 20

For a dilute solution of (NH4)2SO4,the van't Hoff factor (i)would be approximately

Accepted Answer

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

Exam 12: Solutions

What is the freezing point of a 0.19 m solution of glucose,C6H12O6,in water? (Kf for water is 1.858°C/m.)

Which of the following favor(s)the solubility of an ionic solid in a liquid solvent?

The solubility of a gas in a liquid can always be increased by

A concentrated sodium hydroxide solution is 50.5% NaOH by mass and has a density of 1.53 g/mL at 25°C.What is the molarity of NaOH?

How does the solubility of a gas in a solvent depend on pressure and temperature?

A concentrated sulfuric acid solution is 65.0% H2SO4 by mass and has a density of 1.55 g/mL at 20°C.What is the mass of 9.00 L of the concentrated sulfuric acid solution?

What is the mass percent of an aqueous sodium hydroxide solution in which the molality of NaOH is 10.7 m? The density of the solution is 1.3311 g/mL.

A solute added to a solvent raises the boiling point of the solution because

A solution of CF3H in H2CO is most likely to

What type of colloid is formed when a liquid is dispersed in a gas?

Which of the following solutions would have the highest osmotic pressure?

A solution of two liquids,A and B,shows negative deviation from Raoult's law.This means that

A solution of water and a nonvolatile,nonionizing compound is placed in a tube with a semipermeable membrane on one side.The tube is placed in a beaker of pure water.What initial net effect will occur?

What is the mole fraction of water in a solution that contains 8.0 mol of ethanol (C2H5OH)and 1.6 mol of water?

Which of the following pure liquids is the best solvent for sodium fluoride?

A(n)_____ is a homogeneous mixture of two or more substances,consisting of ions or molecules.

When a liquid is dispersed in another liquid,the resulting colloid is called a(n)

What is the mass percent of an aqueous sodium hydroxide solution in which the molarity of NaOH is 9.98 M? The density of the solution is 1.33 g/mL.

For a dilute solution of (NH4)2SO4,the van't Hoff factor (i)would be approximately

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What is the freezing point of a 0.19 m solution of glucose,C₆H₁₂O₆,in water? (K_f for water is 1.858°C/m.)

A concentrated sulfuric acid solution is 65.0% H₂SO₄ by mass and has a density of 1.55 g/mL at 20°C.What is the mass of 9.00 L of the concentrated sulfuric acid solution?

A solution of CF₃H in H₂CO is most likely to

What is the mole fraction of water in a solution that contains 8.0 mol of ethanol (C₂H₅OH)and 1.6 mol of water?

For a dilute solution of (NH₄)₂SO₄,the van't Hoff factor (i)would be approximately