Question 1

Concentrations of fluoride in drinking water greater than 4.0 mg/L can cause mottled teeth in children.What is 4.0 mg/L expressed as molality?

Accepted Answer

The answer of Concentrations of fluoride in drinking water greater...

Question 2

A phase diagram of temperature versus composition for a mixture of the two volatile liquids octane (bp =   and decane (bp = 126°C)is shown.  
-Assume that you start with a mixture containing 0.80 mol of decane and 0.20 mol of octane,what region of the diagram corresponds to vapor?

Accepted Answer

A) region a 
B) region b 
C) region c 
D) regions a and c 
A) region a 
B) region b 
C) region c 
D) regions a and c

Question 3

A solution of 0.2113 g of water dissolved in 25.0 g of a solvent freezes at 11.5°C below the freezing point of the solvent.What is Kf for this solvent?

Accepted Answer

A) 0.735°C/m 
B) 1.36°C/m 
C) 5.39°C/m 
D) 24.5°C/m 
A) 0.735°C/m 
B) 1.36°C/m 
C) 5.39°C/m 
D) 24.5°C/m

Question 4

Which of the following statements is true for a supersaturated solution?

Accepted Answer

A) The solute in the solution is at equilibrium with undissolved solute. 
B) The solution contains more than the equilibrium amount of solute. 
C) The solution is stable and the solute will not precipitate. 
D) A supersaturated solution is more than 50% solute by mass. 
A) The solute in the solution is at equilibrium with undissolved solute. 
B) The solution contains more than the equilibrium amount of solute. 
C) The solution is stable and the solute will not precipitate. 
D) A supersaturated solution is more than 50% solute by mass.

Question 5

Which of the following does not affect the solubility of a solute in a given solvent?

Accepted Answer

A) hydrogen bonding of the solute 
B) nonpolarity of the solvent 
C) rate of stirring 
D) temperature of the solvent and solute 
A) hydrogen bonding of the solute 
B) nonpolarity of the solvent 
C) rate of stirring 
D) temperature of the solvent and solute

Question 6

A solution of LiCl in water is 22.0 wt% LiCl.What is the mole fraction of LiCl?

Accepted Answer

A) 0.107 
B) 0.120 
C) 0.519 
D) 4.33 
A) 0.107 
B) 0.120 
C) 0.519 
D) 4.33

Question 7

To make a 0.125 m solution,one could take 0.125 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 8

A 1.0 m aqueous BaI2 solution will have a ________ vapor pressure,________ freezing point,and ________ boiling point than a 1.0 m aqueous solution of LiI.

Accepted Answer

Question 9

Drawing (1)shows the equilibrium vapor pressure of a pure liquid.Which drawing (2)-(5)represents the equilibrium vapor pressure when a nonvolatile solute is dissolved in the liquid?

Accepted Answer

A) drawing (2) 
B) drawing (3) 
C) drawing (4) 
D) drawing (5) 
A) drawing (2) 
B) drawing (3) 
C) drawing (4) 
D) drawing (5)

Question 10

A phase diagram of temperature versus composition for a mixture of the two volatile liquids octane (bp =   and decane (bp = 126°C)is shown.  
-Assume that you start with a mixture containing 0.80 mol of decane and 0.20 mol of octane,what region of the diagram corresponds to liquid?

Accepted Answer

A) region a 
B) region b 
C) region c 
D) regions a and c 
A) region a 
B) region b 
C) region c 
D) regions a and c

Question 11

What volume of 3.00 M CH3OH solution is needed to provide 0.320 mol of CH3OH?

Accepted Answer

A) 1.04 mL 
B) 9.38 mL 
C) 107 mL 
D) 960 mL 
A) 1.04 mL 
B) 9.38 mL 
C) 107 mL 
D) 960 mL

Question 12

A solution of LiCl in water is 9.00 wt% LiCl.What is the mole fraction of LiCl?

Accepted Answer

A) 0.0407 
B) 0.0466 
C) 0.212 
D) 2.28 
A) 0.0407 
B) 0.0466 
C) 0.212 
D) 2.28

Question 13

The following diagram shows a close-up view of the vapor pressure curves for a pure solvent and a solution containing a nonvolatile solute dissolved in this solvent.  
-Which curve is the solvent and what happens to the boiling point when the solute is dissolved in the solvent?

Accepted Answer

A) Curve (a)is the solvent and the boiling point decreases. 
B) Curve (a)is the solvent and the boiling point increases. 
C) Curve (b)is the solvent and the boiling point decreases. 
D) Curve (b)is the solvent and the boiling point increases. 
A) Curve (a)is the solvent and the boiling point decreases. 
B) Curve (a)is the solvent and the boiling point increases. 
C) Curve (b)is the solvent and the boiling point decreases. 
D) Curve (b)is the solvent and the boiling point increases.

Question 14

What molality of pentane is obtained by dissolving 25 g pentane,C5H12,in 245.0 g hexane,C6H14?

Accepted Answer

A) 0.093 m 
B) 0.11 m 
C) 1.4 m 
D) 100 m 
A) 0.093 m 
B) 0.11 m 
C) 1.4 m 
D) 100 m

Question 15

Which cation in each set would be expected to have the larger (more negative)hydration energy? I.Cu+or Cu2+
II.Li+ or NH4+

Accepted Answer

A) Cu+ in set I and Li+ in set II 
B) Cu+ in set I and NH4+ in set II 
C) Cu2+ in set I and Li+ in set II 
D) Cu2+ in set I and NH4+ in set II 
A) Cu+ in set I and Li+ in set II 
B) Cu+ in set I and NH4+ in set II 
C) Cu2+ in set I and Li+ in set II 
D) Cu2+ in set I and NH4+ in set II

Question 16

Which cation in each set is expected to have the larger (more negative)hydration energy? I.Mg2+ or Ca2+
II.Li+ or Al3+

Accepted Answer

A) Mg2+ in set I and Li+ in set II 
B) Mg2+ in set I and Al3+ in set II 
C) Ca2+ in set I and Li+ in set II 
D) Ca2+ in set I and Al3+ in set II 
A) Mg2+ in set I and Li+ in set II 
B) Mg2+ in set I and Al3+ in set II 
C) Ca2+ in set I and Li+ in set II 
D) Ca2+ in set I and Al3+ in set II

Question 17

A solution is prepared by dissolving 17.75 g sulfuric acid,H2SO4,in enough water to make 100.0 mL of solution.If the density of the solution is 1.1094 g/mL,what is the molarity?

Accepted Answer

A) 0.1775 M H2SO4 
B) 0.1810 M H2SO4 
C) 1.810 M H2SO4 
D) 1.940 M H2SO4 
A) 0.1775 M H2SO4 
B) 0.1810 M H2SO4 
C) 1.810 M H2SO4 
D) 1.940 M H2SO4

Question 18

At 25°C the vapor pressures of benzene and toluene are 96.0 mm Hg and 30.5 mm Hg,respectively.The vapor pressure of a solution that has a 0.50 mole fraction of toluene will have a vapor pressure ________ (equal to,greater than,less than)30.5 mm Hg.

Accepted Answer

The answer of At 25°C the vapor pressures of benzene...

Question 19

What is the weight percent of a caffeine solution made by dissolving 4.00 g of caffeine,C8H10N4O2,in 75.0 g of benzene,C6H6?

Accepted Answer

A) 0.0506% 
B) 0.0533% 
C) 5.06% 
D) 5.33% 
A) 0.0506% 
B) 0.0533% 
C) 5.06% 
D) 5.33%

Question 20

What is the molality of a glucose solution prepared by dissolving 27.0 g of glucose,C6H12O6,in 125.9 g of water?

Accepted Answer

A) 1.19 × 10-3 m 
B) 0.214 m 
C) 0.981 m 
D) 1.19 m 
A) 1.19 × 10-3 m 
B) 0.214 m 
C) 0.981 m 
D) 1.19 m

Exam 12: Solutions and Their Properties

Concentrations of fluoride in drinking water greater than 4.0 mg/L can cause mottled teeth in children.What is 4.0 mg/L expressed as molality?

A phase diagram of temperature versus composition for a mixture of the two volatile liquids octane (bp = and decane (bp = 126°C)is shown. -Assume that you start with a mixture containing 0.80 mol of decane and 0.20 mol of octane,what region of the diagram corresponds to vapor?

A solution of 0.2113 g of water dissolved in 25.0 g of a solvent freezes at 11.5°C below the freezing point of the solvent.What is Kf for this solvent?

Which of the following statements is true for a supersaturated solution?

Which of the following does not affect the solubility of a solute in a given solvent?

A solution of LiCl in water is 22.0 wt% LiCl.What is the mole fraction of LiCl?

To make a 0.125 m solution,one could take 0.125 moles of solute and add

A 1.0 m aqueous BaI2 solution will have a ________ vapor pressure,________ freezing point,and ________ boiling point than a 1.0 m aqueous solution of LiI.

Drawing (1)shows the equilibrium vapor pressure of a pure liquid.Which drawing (2)-(5)represents the equilibrium vapor pressure when a nonvolatile solute is dissolved in the liquid?

A phase diagram of temperature versus composition for a mixture of the two volatile liquids octane (bp = and decane (bp = 126°C)is shown. -Assume that you start with a mixture containing 0.80 mol of decane and 0.20 mol of octane,what region of the diagram corresponds to liquid?

What volume of 3.00 M CH3OH solution is needed to provide 0.320 mol of CH3OH?

A solution of LiCl in water is 9.00 wt% LiCl.What is the mole fraction of LiCl?

The following diagram shows a close-up view of the vapor pressure curves for a pure solvent and a solution containing a nonvolatile solute dissolved in this solvent. -Which curve is the solvent and what happens to the boiling point when the solute is dissolved in the solvent?

What molality of pentane is obtained by dissolving 25 g pentane,C5H12,in 245.0 g hexane,C6H14?

Which cation in each set would be expected to have the larger (more negative)hydration energy? I.Cu+or Cu2+ II.Li+ or NH4+

Which cation in each set is expected to have the larger (more negative)hydration energy? I.Mg2+ or Ca2+ II.Li+ or Al3+

A solution is prepared by dissolving 17.75 g sulfuric acid,H2SO4,in enough water to make 100.0 mL of solution.If the density of the solution is 1.1094 g/mL,what is the molarity?

At 25°C the vapor pressures of benzene and toluene are 96.0 mm Hg and 30.5 mm Hg,respectively.The vapor pressure of a solution that has a 0.50 mole fraction of toluene will have a vapor pressure ________ (equal to,greater than,less than)30.5 mm Hg.

What is the weight percent of a caffeine solution made by dissolving 4.00 g of caffeine,C8H10N4O2,in 75.0 g of benzene,C6H6?

What is the molality of a glucose solution prepared by dissolving 27.0 g of glucose,C6H12O6,in 125.9 g of water?

Chemical Tools: Experimentation and Measurement

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Covalent Compounds: Bonding Theories and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Liquids, solids, and Phase Changes

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Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

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Filters

A solution of 0.2113 g of water dissolved in 25.0 g of a solvent freezes at 11.5°C below the freezing point of the solvent.What is K_f for this solvent?

A 1.0 m aqueous BaI₂ solution will have a vapor pressure, freezing point,and boiling point than a 1.0 m aqueous solution of LiI.

What volume of 3.00 M CH₃OH solution is needed to provide 0.320 mol of CH₃OH?

What molality of pentane is obtained by dissolving 25 g pentane,C₅H₁₂,in 245.0 g hexane,C₆H₁₄?

Which cation in each set would be expected to have the larger (more negative)hydration energy? I.Cu⁺or Cu²⁺ II.Li⁺ or NH₄⁺

Which cation in each set is expected to have the larger (more negative)hydration energy? I.Mg²⁺ or Ca²⁺ II.Li⁺ or Al³⁺

A solution is prepared by dissolving 17.75 g sulfuric acid,H₂SO₄,in enough water to make 100.0 mL of solution.If the density of the solution is 1.1094 g/mL,what is the molarity?

What is the weight percent of a caffeine solution made by dissolving 4.00 g of caffeine,C₈H₁₀N₄O₂,in 75.0 g of benzene,C₆H₆?

What is the molality of a glucose solution prepared by dissolving 27.0 g of glucose,C₆H₁₂O₆,in 125.9 g of water?