Question 1

Which relationship best describes  Δ\DeltaΔ S  °\degree°  for the following reaction? 
8H2(g)  + S8(s)   →\rightarrow→  8H2S(g)

Accepted Answer

A)   ( Δ\DeltaΔ S  °\degree°  =  Δ\DeltaΔ H  °\degree° ) 
B)   ( Δ\DeltaΔ S  °\degree°  =  Δ\DeltaΔ H  °\degree° /T) 
C)   ( Δ\DeltaΔ S  °\degree°   ≈\approx≈  0) 
D)   ( Δ\DeltaΔ S  °\degree°  
E)   ( Δ\DeltaΔ S  °\degree°  > 0)

Question 2

Which of the following is necessary for a process to be spontaneous?

Accepted Answer

A)   ( Δ\DeltaΔ Hsys 
B)   ( Δ\DeltaΔ Ssys > 0) 
C)   ( Δ\DeltaΔ Ssurr
D)   ( Δ\DeltaΔ Suniv > 0) 
E)   ( Δ\DeltaΔ Gsys = 0)

Question 3

Sulfuryl dichloride is formed when sulfur dioxide reacts with chlorine. The data refer to 298 K.   What is the value of  Δ\DeltaΔ G °\degree° for this reaction at 600 K?

Accepted Answer

A)   -162.8 kJ
B)   -40.1 kJ
C)   -28.4 kJ
D)   28.4 kJ
E)   162.8 kJ

Question 4

When a sky diver free-falls through the air, the process is

Accepted Answer

A)   non-spontaneous because he is accelerating due to the force applied by gravity.
B)   non-spontaneous because he is losing potential energy.
C)   non-spontaneous, if he had planned the jump for two weeks.
D)   spontaneous.
E)   in equilibrium.

Question 5

Which of the following is always true for an endothermic process?

Accepted Answer

A)   qsys > 0,  Δ\DeltaΔ Ssurr 
B)   qsys Δ\DeltaΔ Ssurr > 0
C)   qsys Δ\DeltaΔ Ssurr 
D)   qsys > 0,  Δ\DeltaΔ Ssurr > 0
E)   w < 0

Question 6

Calculate  Δ\DeltaΔ S °\degree°  for the reaction

Accepted Answer

A)   -118.2 J/K
B)   -104.8 J/K
C)   104.8 J/K
D)   118.2 J/K
E)   1270.0 J/K

Question 7

For a chemical reaction to be non-spontaneous at any temperature, which of the following conditions must be met?

Accepted Answer

A)   ( Δ\DeltaΔ S °\degree° > 0,  Δ\DeltaΔ H °\degree°   > 0) 
B)   ( Δ\DeltaΔ S °\degree°  > 0,  Δ\DeltaΔ H °\degree°   
C)   ( Δ\DeltaΔ S °\degree°  Δ\DeltaΔ H °\degree°   
D)   ( Δ\DeltaΔ S °\degree°  Δ\DeltaΔ H °\degree°  > 0) 
E)   All reactions are spontaneous at some temperature.

Question 8

Which relationship best describes  Δ\DeltaΔ S  °\degree° for the following reaction? 
CO(g)  + H2O(g)   →\rightarrow→  CO2(g)  + H2(g)

Accepted Answer

A)   ( Δ\DeltaΔ S  °\degree°  =  Δ\DeltaΔ H  °\degree° ) 
B)   ( Δ\DeltaΔ S  °\degree°  =  Δ\DeltaΔ H  °\degree° T) 
C)   ( Δ\DeltaΔ S  °\degree° > 0) 
D)   ( Δ\DeltaΔ S  °\degree°  
E)   ( Δ\DeltaΔ S  °\degree°≈\approx≈ 0)

Question 9

Calculate  Δ\DeltaΔ S °\degree°  for the reaction

Accepted Answer

A)   -548.1 J/K
B)   -147.7 J/K
C)   147.7 J/K
D)   310.1 J/K
E)   548.1 J/K

Question 10

Which of the following is always true for an exothermic process?

Accepted Answer

A)   qsys > 0,  Δ\DeltaΔ Ssurr 
B)   qsys Δ\DeltaΔ Ssurr > 0
C)   qsys Δ\DeltaΔ Ssurr 
D)   qsys > 0,  Δ\DeltaΔ Ssurr > 0
E)   w < 0

Question 11

Which of the following is true for pure oxygen gas, O2(g)  at 25 °\degree° C?

Accepted Answer

A)   ( Δ\DeltaΔ H °\degree° f > 0) 
B)   ( Δ\DeltaΔ H °\degree° f 
C)   ( Δ\DeltaΔ G °\degree° f > 0) 
D)   ( Δ\DeltaΔ G °\degree° f 
E)   (S °\degree° > 0)

Question 12

Calculate Δ\DeltaΔ S °\degree°  for the combustion of propane.

Accepted Answer

A)   -100.9 J/K
B)   -72.5 J/K
C)   72.5 J/K
D)   100.9 J/K
E)   877.5 J/K

Question 13

In some spontaneous processes, the entropy of the surroundings decreases.

Accepted Answer

A) True 
 B)False

Question 14

The formation constant for the reaction Ag+(aq)  + 2NH3(aq)  +(aq)  + 2NH3(aq)    Ag(NH3) 2+(aq)  is Kf = 1.7 *107 at 25 \degree C. What is  \Delta G \degree at this temperature? A)  -1.5 kJ B)  -3.5 kJ C)  -18 kJ D)  -23 kJ E)  -41 kJ " class="answers-bank-image d-inline" rel="preload" > Ag(NH3) 2+(aq)  is Kf = 1.7 *107 at 25 °\degree° C. What is  Δ\DeltaΔ G °\degree° at this temperature?

Accepted Answer

A)   -1.5 kJ
B)   -3.5 kJ
C)   -18 kJ
D)   -23 kJ
E)   -41 kJ

Question 15

In order for a process to be spontaneous,

Accepted Answer

A)   ( Δ\DeltaΔ H must be less than zero.) 
B)   ( Δ\DeltaΔ S must be greater than zero.) 
C)   ( Δ\DeltaΔ G must be greater than zero.) 
D)   it should be rapid.
E)   ( Δ\DeltaΔ Ssys +  Δ\DeltaΔ Ssurr must be greater than zero.)

Question 16

Nitric oxide reacts with chlorine to form NOCl. The data refer to 298 K.   What is the value of  Δ\DeltaΔ G °\degree° for this reaction at 550 K?

Accepted Answer

A)   -143.76 kJ
B)   -78.78 kJ
C)   -22.24 kJ
D)   -10.56 kJ
E)   66600 kJ

Question 17

Consider the figure below which shows  Δ\DeltaΔ G °\degree°   for a chemical process plotted against absolute temperature.  0,  \Delta S \degree  > 0)  B) (  \Delta H \degree   > 0,  \Delta S \degree   0)  D) (  \Delta H \degree    From this plot, it is reasonable to conclude that:

Accepted Answer

A)   ( Δ\DeltaΔ H °\degree°   > 0,  Δ\DeltaΔ S °\degree°  > 0) 
B)  (  Δ\DeltaΔ H °\degree°   > 0,  Δ\DeltaΔ S °\degree°  
C)  ( Δ\DeltaΔ H °\degree°   Δ\DeltaΔ S °\degree° > 0) 
D)  (  Δ\DeltaΔ H °\degree°   Δ\DeltaΔ S °\degree°  
E)   None of these choices is correct.

Question 18

A certain process has  Δ\DeltaΔ Suniv > 0 at 25  °\degree° C. What does one know about the process?

Accepted Answer

A)   It is exothermic.
B)   It is endothermic.
C)   It is spontaneous at 25  °\degree° C.
D)   It will move rapidly toward equilibrium.
E)   None of these choices is correct.

Question 19

Iron(III) oxide can be reduced by carbon monoxide.

Accepted Answer

The answer of Iron(III) oxide can be reduced by carbon...

Question 20

Calculate  Δ\DeltaΔ G  °\degree° for the reaction

Accepted Answer

A)   566.60 kJ
B)   50.38 kJ
C)   25.19 kJ
D)   -25.19 kJ
E)   -566.60 kJ

Exam 20: Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions

Calculate $\Delta$ G $\degree$ for the reaction $Calculate \Delta G \degree for the reaction A) 566.60 kJ B) 50.38 kJ C) 25.19 kJ D) -25.19 kJ E) -566.60 kJ$ $Calculate \Delta G \degree for the reaction A) 566.60 kJ B) 50.38 kJ C) 25.19 kJ D) -25.19 kJ E) -566.60 kJ$

Correct Answer
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Which of the following is necessary for a process to be spontaneous?

Correct Answer
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In order for a process to be spontaneous,

Correct Answer
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For a chemical reaction to be non-spontaneous at any temperature, which of the following conditions must be met?

Correct Answer
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When a sky diver free-falls through the air, the process is

Correct Answer
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Correct Answer
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Which of the following is true for pure oxygen gas, O₂(g) at 25 $\degree$ C?

Correct Answer
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Which of the following is always true for an exothermic process?

Correct Answer
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Which relationship best describes $\Delta$ S $\degree$ for the following reaction? CO(g) + H₂O(g) $\rightarrow$ CO₂(g) + H₂(g)

Correct Answer
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In some spontaneous processes, the entropy of the surroundings decreases.

Correct Answer
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Which of the following is always true for an endothermic process?

Correct Answer
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Calculate $\Delta$ S $\degree$ for the reaction $Calculate \Delta S \degree for the reaction A) -118.2 J/K B) -104.8 J/K C) 104.8 J/K D) 118.2 J/K E) 1270.0 J/K$ $Calculate \Delta S \degree for the reaction A) -118.2 J/K B) -104.8 J/K C) 104.8 J/K D) 118.2 J/K E) 1270.0 J/K$

Correct Answer
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Calculate $\Delta$ S $\degree$ for the reaction $Calculate \Delta S \degree for the reaction A) -548.1 J/K B) -147.7 J/K C) 147.7 J/K D) 310.1 J/K E) 548.1 J/K$ $Calculate \Delta S \degree for the reaction A) -548.1 J/K B) -147.7 J/K C) 147.7 J/K D) 310.1 J/K E) 548.1 J/K$

Correct Answer
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Which relationship best describes $\Delta$ S $\degree$ for the following reaction? 8H₂(g) + S₈(s) $\rightarrow$ 8H₂S(g)

Correct Answer
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Iron(III) oxide can be reduced by carbon monoxide.

Correct Answer
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A certain process has $\Delta$ S_univ > 0 at 25 $\degree$ C. What does one know about the process?

Correct Answer
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Exam 20: Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions

Calculate Δ\DeltaΔ G °\degree° for the reaction

Correct AnswerverifiedShow Answer

Which of the following is necessary for a process to be spontaneous?

Correct AnswerverifiedShow Answer

In order for a process to be spontaneous,

Correct AnswerverifiedShow Answer

The formation constant for the reaction Ag+(aq) + 2NH3(aq) Ag(NH3) 2+(aq) is Kf = 1.7 *107 at 25 °\degree° C. What is Δ\DeltaΔ G °\degree° at this temperature?

Correct AnswerverifiedShow Answer

Sulfuryl dichloride is formed when sulfur dioxide reacts with chlorine. The data refer to 298 K. What is the value of Δ\DeltaΔ G °\degree° for this reaction at 600 K?

Correct AnswerverifiedShow Answer

For a chemical reaction to be non-spontaneous at any temperature, which of the following conditions must be met?

Correct AnswerverifiedShow Answer

Consider the figure below which shows Δ\DeltaΔ G °\degree° for a chemical process plotted against absolute temperature. From this plot, it is reasonable to conclude that:

Correct AnswerverifiedShow Answer

When a sky diver free-falls through the air, the process is

Correct AnswerverifiedShow Answer

Nitric oxide reacts with chlorine to form NOCl. The data refer to 298 K. What is the value of Δ\DeltaΔ G °\degree° for this reaction at 550 K?

Correct AnswerverifiedShow Answer

Which of the following is true for pure oxygen gas, O2(g) at 25 °\degree° C?

Correct AnswerverifiedShow Answer

Which of the following is always true for an exothermic process?

Correct AnswerverifiedShow Answer

Which relationship best describes Δ\DeltaΔ S °\degree° for the following reaction? CO(g) + H2O(g) →\rightarrow→ CO2(g) + H2(g)

Correct AnswerverifiedShow Answer

In some spontaneous processes, the entropy of the surroundings decreases.

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Calculate Δ\DeltaΔ S °\degree° for the combustion of propane.

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Which of the following is always true for an endothermic process?

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Calculate Δ\DeltaΔ S °\degree° for the reaction

Correct AnswerverifiedShow Answer

Calculate Δ\DeltaΔ S °\degree° for the reaction

Correct AnswerverifiedShow Answer

Which relationship best describes Δ\DeltaΔ S °\degree° for the following reaction? 8H2(g) + S8(s) →\rightarrow→ 8H2S(g)

Correct AnswerverifiedShow Answer

Iron(III) oxide can be reduced by carbon monoxide.

Correct AnswerverifiedShow Answer

A certain process has Δ\DeltaΔ Suniv > 0 at 25 °\degree° C. What does one know about the process?

Correct AnswerverifiedShow Answer

Calculate $\Delta$ G $\degree$ for the reaction $Calculate \Delta G \degree for the reaction A) 566.60 kJ B) 50.38 kJ C) 25.19 kJ D) -25.19 kJ E) -566.60 kJ$ $Calculate \Delta G \degree for the reaction A) 566.60 kJ B) 50.38 kJ C) 25.19 kJ D) -25.19 kJ E) -566.60 kJ$

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Which of the following is true for pure oxygen gas, O₂(g) at 25 $\degree$ C?

Correct Answer
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Correct Answer
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Which relationship best describes $\Delta$ S $\degree$ for the following reaction? CO(g) + H₂O(g) $\rightarrow$ CO₂(g) + H₂(g)

Correct Answer
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Calculate $\Delta$ S $\degree$ for the reaction $Calculate \Delta S \degree for the reaction A) -118.2 J/K B) -104.8 J/K C) 104.8 J/K D) 118.2 J/K E) 1270.0 J/K$ $Calculate \Delta S \degree for the reaction A) -118.2 J/K B) -104.8 J/K C) 104.8 J/K D) 118.2 J/K E) 1270.0 J/K$

Correct Answer
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Calculate $\Delta$ S $\degree$ for the reaction $Calculate \Delta S \degree for the reaction A) -548.1 J/K B) -147.7 J/K C) 147.7 J/K D) 310.1 J/K E) 548.1 J/K$ $Calculate \Delta S \degree for the reaction A) -548.1 J/K B) -147.7 J/K C) 147.7 J/K D) 310.1 J/K E) 548.1 J/K$

Correct Answer
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Which relationship best describes $\Delta$ S $\degree$ for the following reaction? 8H₂(g) + S₈(s) $\rightarrow$ 8H₂S(g)

Correct Answer
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Correct Answer
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A certain process has $\Delta$ S_univ > 0 at 25 $\degree$ C. What does one know about the process?

Correct Answer
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