Question 1

Which of the following processes is predicted to decrease the entropy of a system?

Accepted Answer

A)  The number of particles increases.
B)  Temperature increases.
C)  Volume increases.
D)  Pressure increases.
E)  All of these increase the entropy of the system.

Question 2

When solid pellets of sodium hydroxide (NaOH) dissolve in water,the temperature of the water can rise dramatically.Taking NaOH as the system,what can you deduce about the signs of the entropy change of the system ( Δ\DeltaΔ Ssys) and surroundings ( Δ\DeltaΔ Ssurr) from this?

Accepted Answer

A)  " Δ\DeltaΔ Ssys is less than 0 and  Δ\DeltaΔ Ssurr is less than 0."
B)  " Δ\DeltaΔ Ssys is less than 0 and  Δ\DeltaΔ Ssurr is greater than 0."
C)  " Δ\DeltaΔ Ssys is greater than 0 and  Δ\DeltaΔ Ssurr is less than 0."
D)  " Δ\DeltaΔ Ssys is greater than 0 and  Δ\DeltaΔ Ssurr is greater than 0."
E)  "Nothing can be deduced from this limited information."

Question 3

Which of the following statements regarding coupled reactions and how they sustain life is NOT correct?

Accepted Answer

A)  Organisms carry out reactions that release energy contained in the chemical bonds in food.
B)  Energy released from the chemical bonds in food can be used to do useful work and sustain essential biological functions.
C)  Part of the energy available from the chemical bonds in food is released as heat.
D)  In living systems,spontaneous reactions typically involve breaking food down.
E)  Production of glucose by plants is a spontaneous process.

Question 4

The dissolution of ammonium nitrate in water is a spontaneous endothermic process.It is spontaneous because the system undergoes __________

Accepted Answer

A)  a decrease in enthalpy.
B)  an increase in entropy.
C)  an increase in enthalpy.
D)  a decrease in entropy.
E)  an increase in free energy.

Question 5

At what temperature does the Fe(s)  ⇆\leftrightarrows⇆  Fe(g) phase transition occur?  Δ\DeltaΔ H = 415.5 kJ/mol;  Δ\DeltaΔ S = 153.4 J/mol . K.

Accepted Answer

A)  2162 ∘\circ∘ F
B)  2435 ∘\circ∘ F
C)  4352 ∘\circ∘ F
D)  4416 ∘\circ∘ F
E)  2709 ∘\circ∘ F

Question 6

The standard molar enthalpy of fusion for xenon is 2.30 kJ mol-1.Calculate the standard molar entropy for the freezing of liquid xenon given that its normal freezing point is -112S1U1P1$\circ$S1S1P0C.

Accepted Answer

The answer of The standard molar enthalpy of fusion for...

Question 7

Hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH) to form sodium chloride (NaCl) and water.If  Δ\DeltaΔ H ∘\circ∘  = -56.13 kJ/mol and  Δ\DeltaΔ S ∘\circ∘  = 79.11 J/mol . K,what is  Δ\DeltaΔ G ∘\circ∘  for this reaction at 20.00 ∘\circ∘ C?

Accepted Answer

A)  -79.32 kJ/mol
B)  -77.73 kJ/mol
C)  -2.324  ×	imes×  104 kJ/mol
D)  79.32 kJ/mol
E)  -1638 kJ/mol

Question 8

What is the overall standard free energy change for the following two reactions? 
A + B  →	o→  C 
1 C + D  	o  E     =  \Delta G2  A)   \Delta G1 +  \Delta G2  B)   \Delta G1 -  \Delta G2  C)   \Delta G2 -  \Delta G1  D)   \Delta G1 \Delta G2  E)   \Delta G1/ \Delta G2  " class="answers-bank-image d-inline" rel="preload" > =  Δ\DeltaΔ G1
C + D  →	o→  E
 1 C + D  	o  E     =  \Delta G2  A)   \Delta G1 +  \Delta G2  B)   \Delta G1 -  \Delta G2  C)   \Delta G2 -  \Delta G1  D)   \Delta G1 \Delta G2  E)   \Delta G1/ \Delta G2  " class="answers-bank-image d-inline" rel="preload" >  =  Δ\DeltaΔ G2

Accepted Answer

A)  " Δ\DeltaΔ G1 +  Δ\DeltaΔ G2"
B)  " Δ\DeltaΔ G1 -  Δ\DeltaΔ G2"
C)  " Δ\DeltaΔ G2 -  Δ\DeltaΔ G1"
D)  " Δ\DeltaΔ G1 Δ\DeltaΔ G2"
E)  " Δ\DeltaΔ G1/ Δ\DeltaΔ G2"

Question 9

Which of the following is in the correct order of standard state entropy? 
I.Diamond 3 2

Accepted Answer

A)  I only
B)  II only
C)  III only
D)  I and II only
E)  I and III only

Question 10

Which of the following probably has the highest entropy at 298 K?

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 11

Suppose a fermentation process occurs in the cytoplasm of the cells of an organism.Overall,the conversion of glucose to lactate is coupled to the phosphorylation of two ADP to produce two ATP.Using the following reactions,write the balanced equation and calculate the free-energy change of the fermentation reaction."Pi" is used to represent phosphate.
1)glucose $\leftrightarrows$2 lactate $\Delta$G1 = -196.6 kJ/mol
2)ADP + Pi $\leftrightarrows$ATP + H2O $\Delta$G2 = 30.5 kJ/mol

Accepted Answer

glucose + 2 ADP + 2 P_i

Question 12

Which of the following graphs best depicts the entropy of a pure substance as the temperature is raised from its solid form through its liquid and gaseous forms? Assume the substance obeys the third law of thermodynamics.

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 13

Which of the following will have the greatest standard molar entropy (S ∘\circ∘ ) ?

Accepted Answer

A)  NH3(g) 
B)  He(g) 
C)  C(s,graphite) 
D)  H2O(  \circ ) ? 
A)  NH3(g)  
B)  He(g)  
C)  C(s,graphite)  
D)  H2O(   )  
E)  CaCO3(s)  " class="answers-bank-image d-inline" rel="preload" > ) 
E)  CaCO3(s)

Question 14

What is the standard entropy change when 10.0 g of methane reacts with 10.0 g of oxygen to form carbon dioxide and liquid water?

Accepted Answer

A)  -121 J/K
B)  -37.9 J/K
C)  -243 J/K
D)  -154 J/K
E)  -16.8 J/K

Question 15

Determine  Δ\DeltaΔ S ∘\circ∘  for the reaction,H2(g) + I2(g)  ⇆\leftrightarrows⇆  2 HI(g) ,given the following information. 
 \circ  for the reaction,H2(g) + I2(g)  \leftrightarrows  2 HI(g) ,given the following information.    A) -41.1 J/mol . K B) -165.3 J/mol . K C) +398.8 J/mol . K D) +165.3 J/mol . K E) +41.1 J/mol . K " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  -41.1 J/mol . K
B)  -165.3 J/mol . K
C)  +398.8 J/mol . K
D)  +165.3 J/mol . K
E)  +41.1 J/mol . K

Question 16

Only one substance has a standard entropy of 0 J/K,and that is H+(aq).Create a plausible explanation for this.

Accepted Answer

Standard entropies for substances are no...

Question 17

The standard molar enthalpy fusion for xenon is 2.30 kJ mol-1.Calculate the change in the entropy of the surroundings when one mole of solid xenon melts in a room maintained
at 25.0S1U1P1$\circ$S1S1P0C.

Accepted Answer

The answer of The standard molar enthalpy fusion for xenon...

Question 18

Determine the value of  Δ\DeltaΔ G ∘\circ∘  for the reaction 2 NO2(g)  ⇆\leftrightarrows⇆ N2O4(g) ,given  \circ  for the reaction 2 NO2(g)  \leftrightarrows N2O4(g) ,given   A) -4.8 kJ B) +4.8 kJ C) +52.3 kJ D) -52.3 kJ E) -43.0 kJ " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  -4.8 kJ
B)  +4.8 kJ
C)  +52.3 kJ
D)  -52.3 kJ
E)  -43.0 kJ

Question 19

The absolute entropy of a NaCl crystal is __________

Accepted Answer

A)  an intensive property and a state function.
B)  an intensive property and a path function.
C)  an extensive property and a state function.
D)  an extensive property and a path function.
E)  not appropriately described in terms of an intensive property,an extensive property,a state function,or a path function.

Question 20

Which of the relationships between the free energy change of a system and associated entropy changes is true?

Accepted Answer

A)  " Δ\DeltaΔ Gsys = +T  Δ\DeltaΔ Ssys"
B)  " Δ\DeltaΔ Gsys = -T  Δ\DeltaΔ Ssys"
C)  " Δ\DeltaΔ Gsys = +T  Δ\DeltaΔ Suniv"
D)  " Δ\DeltaΔ Gsys = -T  Δ\DeltaΔ Ssurr"
E)  " Δ\DeltaΔ Gsys = -T  Δ\DeltaΔ Suniv'

Exam 12: Thermodynamics-Why Chemical Reactions Happen

The absolute entropy of a NaCl crystal is __________

Correct Answer
verified

Only one substance has a standard entropy of 0 J/K,and that is H⁺(aq).Create a plausible explanation for this.

Correct Answer
verified
Standard entropies for substances are no...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
glucose + 2 ADP + 2 P_{iView Answer}

Which of the relationships between the free energy change of a system and associated entropy changes is true?

Correct Answer
verified

The dissolution of ammonium nitrate in water is a spontaneous endothermic process.It is spontaneous because the system undergoes __________

Correct Answer
verified

Which of the following graphs best depicts the entropy of a pure substance as the temperature is raised from its solid form through its liquid and gaseous forms? Assume the substance obeys the third law of thermodynamics.

Correct Answer
verified

Correct Answer
verified

Which of the following statements regarding coupled reactions and how they sustain life is NOT correct?

Correct Answer
verified

Which of the following processes is predicted to decrease the entropy of a system?

Correct Answer
verified

Hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH) to form sodium chloride (NaCl) and water.If $\Delta$ H^$\circ$ = -56.13 kJ/mol and $\Delta$ S^$\circ$ = 79.11 J/mol . K,what is $\Delta$ G^$\circ$ for this reaction at 20.00^$\circ$C?

Correct Answer
verified

Which of the following is in the correct order of standard state entropy? I.Diamond < graphite II.Liquid water < solid water III.NH₃ < H₂

Correct Answer
verified

At what temperature does the Fe(s) $\leftrightarrows$ Fe(g) phase transition occur? $\Delta$ H= 415.5 kJ/mol; $\Delta$ S = 153.4 J/mol . K.

Correct Answer
verified

Which of the following will have the greatest standard molar entropy (S^$\circ$) ?

Correct Answer
verified

What is the standard entropy change when 10.0 g of methane reacts with 10.0 g of oxygen to form carbon dioxide and liquid water?

Correct Answer
verified

The standard molar enthalpy of fusion for xenon is 2.30 kJ mol^-¹.Calculate the standard molar entropy for the freezing of liquid xenon given that its normal freezing point is -112^$\circ$C.

Correct Answer
verified

When solid pellets of sodium hydroxide (NaOH) dissolve in water,the temperature of the water can rise dramatically.Taking NaOH as the system,what can you deduce about the signs of the entropy change of the system ( $\Delta$ S_sys) and surroundings ( $\Delta$ S_surr) from this?

Correct Answer
verified

The standard molar enthalpy fusion for xenon is 2.30 kJ mol^-¹.Calculate the change in the entropy of the surroundings when one mole of solid xenon melts in a room maintained at 25.0^$\circ$C.

Correct Answer
verified

Which of the following probably has the highest entropy at 298 K?

Correct Answer
verified

Exam 12: Thermodynamics-Why Chemical Reactions Happen

The absolute entropy of a NaCl crystal is __________

Correct AnswerverifiedShow Answer

Only one substance has a standard entropy of 0 J/K,and that is H+(aq).Create a plausible explanation for this.

Correct AnswerverifiedStandard entropies for substances are no...View AnswerShow Answer

Determine the value of Δ\DeltaΔ G ∘\circ∘ for the reaction 2 NO2(g) ⇆\leftrightarrows⇆ N2O4(g) ,given

Correct AnswerverifiedShow Answer

What is the overall standard free energy change for the following two reactions? A + B →\to→ C = Δ\DeltaΔ G1 C + D →\to→ E = Δ\DeltaΔ G2

Correct AnswerverifiedShow Answer

Correct Answerverifiedglucose + 2 ADP + 2 PiView AnswerShow Answer

Which of the relationships between the free energy change of a system and associated entropy changes is true?

Correct AnswerverifiedShow Answer

The dissolution of ammonium nitrate in water is a spontaneous endothermic process.It is spontaneous because the system undergoes __________

Correct AnswerverifiedShow Answer

Which of the following graphs best depicts the entropy of a pure substance as the temperature is raised from its solid form through its liquid and gaseous forms? Assume the substance obeys the third law of thermodynamics.

Correct AnswerverifiedShow Answer

Determine Δ\DeltaΔ S ∘\circ∘ for the reaction,H2(g) + I2(g) ⇆\leftrightarrows⇆ 2 HI(g) ,given the following information.

Correct AnswerverifiedShow Answer

Which of the following statements regarding coupled reactions and how they sustain life is NOT correct?

Correct AnswerverifiedShow Answer

Which of the following processes is predicted to decrease the entropy of a system?

Correct AnswerverifiedShow Answer

Hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH) to form sodium chloride (NaCl) and water.If Δ\DeltaΔ H ∘\circ∘ = -56.13 kJ/mol and Δ\DeltaΔ S ∘\circ∘ = 79.11 J/mol . K,what is Δ\DeltaΔ G ∘\circ∘ for this reaction at 20.00 ∘\circ∘ C?

Correct AnswerverifiedShow Answer

Which of the following is in the correct order of standard state entropy? I.Diamond < graphite II.Liquid water < solid water III.NH3 < H2

Correct AnswerverifiedShow Answer

At what temperature does the Fe(s) ⇆\leftrightarrows⇆ Fe(g) phase transition occur? Δ\DeltaΔ H = 415.5 kJ/mol; Δ\DeltaΔ S = 153.4 J/mol . K.

Correct AnswerverifiedShow Answer

Which of the following will have the greatest standard molar entropy (S ∘\circ∘ ) ?

Correct AnswerverifiedShow Answer

What is the standard entropy change when 10.0 g of methane reacts with 10.0 g of oxygen to form carbon dioxide and liquid water?

Correct AnswerverifiedShow Answer

The standard molar enthalpy of fusion for xenon is 2.30 kJ mol-1.Calculate the standard molar entropy for the freezing of liquid xenon given that its normal freezing point is -112 ∘\circ∘ C.

Correct AnswerverifiedShow Answer

When solid pellets of sodium hydroxide (NaOH) dissolve in water,the temperature of the water can rise dramatically.Taking NaOH as the system,what can you deduce about the signs of the entropy change of the system ( Δ\DeltaΔ Ssys) and surroundings ( Δ\DeltaΔ Ssurr) from this?

Correct AnswerverifiedShow Answer

The standard molar enthalpy fusion for xenon is 2.30 kJ mol-1.Calculate the change in the entropy of the surroundings when one mole of solid xenon melts in a room maintained at 25.0 ∘\circ∘ C.

Correct AnswerverifiedShow Answer

Which of the following probably has the highest entropy at 298 K?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Only one substance has a standard entropy of 0 J/K,and that is H⁺(aq).Create a plausible explanation for this.

Correct Answer
verified
Standard entropies for substances are no...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
glucose + 2 ADP + 2 P_{iView Answer}

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH) to form sodium chloride (NaCl) and water.If $\Delta$ H^$\circ$ = -56.13 kJ/mol and $\Delta$ S^$\circ$ = 79.11 J/mol . K,what is $\Delta$ G^$\circ$ for this reaction at 20.00^$\circ$C?

Correct Answer
verified

Which of the following is in the correct order of standard state entropy? I.Diamond < graphite II.Liquid water < solid water III.NH₃ < H₂

Correct Answer
verified

At what temperature does the Fe(s) $\leftrightarrows$ Fe(g) phase transition occur? $\Delta$ H= 415.5 kJ/mol; $\Delta$ S = 153.4 J/mol . K.

Correct Answer
verified

Which of the following will have the greatest standard molar entropy (S^$\circ$) ?

Correct Answer
verified

Correct Answer
verified

The standard molar enthalpy of fusion for xenon is 2.30 kJ mol^-¹.Calculate the standard molar entropy for the freezing of liquid xenon given that its normal freezing point is -112^$\circ$C.

Correct Answer
verified

When solid pellets of sodium hydroxide (NaOH) dissolve in water,the temperature of the water can rise dramatically.Taking NaOH as the system,what can you deduce about the signs of the entropy change of the system ( $\Delta$ S_sys) and surroundings ( $\Delta$ S_surr) from this?

Correct Answer
verified

The standard molar enthalpy fusion for xenon is 2.30 kJ mol^-¹.Calculate the change in the entropy of the surroundings when one mole of solid xenon melts in a room maintained at 25.0^$\circ$C.

Correct Answer
verified

Correct Answer
verified