Question 1

An animal cell assumes its normal volume when it is placed in a solution with a total solute molarity of 0.3 M.If the cell is placed in a solution with a total solute molarity of 0.1 M,

Accepted Answer

A)  water enters the cell,causing expansion.
B)  water leaves the cell,causing contraction.
C)  the escaping tendency of water in the cell increases.
D)  no movement of water takes place.E) A) and D)
F) B) and C)

Question 2

What is the highest temperature that the substance shown in the following phase diagram can exist as a liquid?

Accepted Answer

A)  any temperature above 200 K
B)  200 K
C)  250 K
D)  350 K
E)  400 KF) A) and B)
G) A) and E)

Question 3

A plot of ln(vapor pressure) versus 1/T for benzene gives a straight line with slope -3.70 * 103 K.The enthalpy of vaporization of benzene is

Accepted Answer

A)  2.25 kJ.mol-1 
B)  Not enough information is given to permit the calculation.
C)  3.70 kJ.mol-1 
D)  30.8 kJ.mol-1 
E)  445 J.mol-1 F) B) and E)
G) None of the above

Question 4

the van't Hoff i of HBr,HCl,and HF should all be the same?

Accepted Answer

A) True 
 B)False

Question 5

The phase diagram for sulfur is given below.  The number of phases that sulfur can exist in and the number of triple points,respectively,are

Accepted Answer

A)  3 and 2.
B)  3 and 3.
C)  4 and 2.
D)  3 and 1.
E)  4 and 3.F) B) and E)
G) All of the above

Question 6

The phase diagram for a pure substance is given below.  What pressure must be applied to liquefy a sample at 425 K?

Accepted Answer

A)  350 atm
B)  The sample cannot be liquefied at 425 K.
C)  150 atm
D)  50 atm
E)  250 atmF) A) and D)
G) C) and D)

Question 7

The phase diagram for a pure compound is given below.All of the following could have a similar phase diagram except

Accepted Answer

A)  methanol
B)  carbon dioxide
C)  benzene
D)  carbon tetrachloride
E)  waterF) B) and D)
G) A) and D)

Question 8

Solutions in which intermolecular forces are stronger in the solution than in the pure components have negative enthalpies of mixing.

Accepted Answer

A) True 
 B)False

Question 9

The solubility of oxygen at a certain temperature is 8 ppm.If the partial pressure of oxygen is doubled at this temperature,the solubility is 16 ppm.

Accepted Answer

A) True 
 B)False

Question 10

Because a solute increases the entropy of the liquid phase while the enthalpy is left unchanged,there is a decrease in the molar free energy of the solvent.

Accepted Answer

A) True 
 B)False

Question 11

The condition called the bends results from the rapid release of nitrogen gas in the bloodstream when the diver returns to the surface.Would argon gas or hydrogen gas be suitable replacements for nitrogen gas in "compressed air?" Explain.

Accepted Answer

No,both ar...

Question 12

Consider the phase diagram for CO2 in the text on page 315.A sample of carbon dioxide at 10S1U1P1$\circ$S1S1P0C and 10 atm is a liquid.

Accepted Answer

A) True 
 B)False

Question 13

The vapor pressure of benzene at 25 ∘\circ∘ C is 94.6 Torr and its enthalpy of vaporization is 30.8 kJ.mol-1 .Estimate the normal boiling point of benzene.Assume the enthalpy of vaporization is independent of temperature.

Accepted Answer

A)  640 K
B)  358 K
C)  470 K
D)  624 K
E)  Not enough information given. F) A) and B)
G) B) and E)

Question 14

the van't Hoff i of HF differs from that of HCl?

Accepted Answer

A) True 
 B)False

Question 15

Calculate the molality of perchloric acid in 9.2 M HClO4(aq).The density of this solution is 1.54 g/mL.

Accepted Answer

Question 16

Consider the phase diagrams for water and carbon dioxide given in the text on page 315.Explain the significance of the slopes of the solid-liquid lines.

Accepted Answer

For water,the solid is less de...

Question 17

Which of the following pairs have a vant Hoff i factor of 3?

Accepted Answer

A)  Sodium sulfate and potassium chloride
B)  Calcium chloride and potassium sulfate
C)  Magnesium sulfate and ethylene glycol
D)  Glucose and sodium chloride
E)  Perchloric acid and barium hydroxideF) A) and B)
G) None of the above

Question 18

The phase diagram for a pure substance is shown below.What is the critical pressure?

Accepted Answer

A)  50 atm
B)  150 atm
C)  325 atm
D)  Any pressure above 325 atm
E)  200 atmF) B) and D)
G) All of the above

Question 19

Which of the following 1.0 M solutions contains the most particles?

Accepted Answer

A)  Ethylene glycol
B)  Potassium chloride
C)  Magnesium sulfate
D)  Glucose
E)  Sodium sulfateF) C) and D)
G) A) and B)

Question 20

Of the following five materials,which has the lowest freezing point and the highest boiling point?

Accepted Answer

A)  1.5 m magnesium phosphate
B)  2.0 m potassium chloride
C)  1.0 m sodium chloride
D)  1.5 m aluminum nitrate
E)  1.5 m calcium chlorideF) A) and B)
G) B) and D)

Exam 10: Physical Equilibria

Consider the phase diagram for CO2 in the text on page 315.A sample of carbon dioxide at 10 ∘\circ∘ C and 10 atm is a liquid.

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A plot of ln(vapor pressure) versus 1/T for benzene gives a straight line with slope -3.70 * 103 K.The enthalpy of vaporization of benzene is

Correct AnswerverifiedShow Answer

Consider the phase diagrams for water and carbon dioxide given in the text on page 315.Explain the significance of the slopes of the solid-liquid lines.

Correct AnswerverifiedFor water,the solid is less de...View AnswerShow Answer

Solutions in which intermolecular forces are stronger in the solution than in the pure components have negative enthalpies of mixing.

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The phase diagram for sulfur is given below. The number of phases that sulfur can exist in and the number of triple points,respectively,are

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the van't Hoff i of HF differs from that of HCl?

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Of the following five materials,which has the lowest freezing point and the highest boiling point?

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the van't Hoff i of HBr,HCl,and HF should all be the same?

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What is the highest temperature that the substance shown in the following phase diagram can exist as a liquid?

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The phase diagram for a pure substance is given below. What pressure must be applied to liquefy a sample at 425 K?

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The phase diagram for a pure substance is shown below.What is the critical pressure?

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The solubility of oxygen at a certain temperature is 8 ppm.If the partial pressure of oxygen is doubled at this temperature,the solubility is 16 ppm.

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The vapor pressure of benzene at 25 ∘\circ∘ C is 94.6 Torr and its enthalpy of vaporization is 30.8 kJ.mol-1 .Estimate the normal boiling point of benzene.Assume the enthalpy of vaporization is independent of temperature.

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Which of the following pairs have a vant Hoff i factor of 3?

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Because a solute increases the entropy of the liquid phase while the enthalpy is left unchanged,there is a decrease in the molar free energy of the solvent.

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The condition called the bends results from the rapid release of nitrogen gas in the bloodstream when the diver returns to the surface.Would argon gas or hydrogen gas be suitable replacements for nitrogen gas in "compressed air?" Explain.

Correct AnswerverifiedNo,both ar...View AnswerShow Answer

Which of the following 1.0 M solutions contains the most particles?

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An animal cell assumes its normal volume when it is placed in a solution with a total solute molarity of 0.3 M.If the cell is placed in a solution with a total solute molarity of 0.1 M,

Correct AnswerverifiedShow Answer

The phase diagram for a pure compound is given below.All of the following could have a similar phase diagram except

Correct AnswerverifiedShow Answer

Calculate the molality of perchloric acid in 9.2 M HClO4(aq).The density of this solution is 1.54 g/mL.

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Consider the phase diagram for CO₂ in the text on page 315.A sample of carbon dioxide at 10^$\circ$C and 10 atm is a liquid.

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A plot of ln(vapor pressure) versus 1/T for benzene gives a straight line with slope -3.70 * 10³ K.The enthalpy of vaporization of benzene is

Correct Answer
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For water,the solid is less de...
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The vapor pressure of benzene at 25^$\circ$C is 94.6 Torr and its enthalpy of vaporization is 30.8 kJ.mol^-1.Estimate the normal boiling point of benzene.Assume the enthalpy of vaporization is independent of temperature.

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No,both ar...
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Calculate the molality of perchloric acid in 9.2 M HClO₄(aq).The density of this solution is 1.54 g/mL.

Correct Answer
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