Question 1

Consider the following reaction: CuS(s)  + O2(g)  ⇌ Cu(s)  + SO2(g) 
A reaction mixture initially contains 2.9 mol L-1 O2. Determine the equilibrium concentration of O2 if Kc for the reaction at this temperature is 1.5.

Accepted Answer

A)   1.9 mol L-1
B)   1.7 mol L-1
C)   2.2 mol L-1
D)   1.2 mol L-1
E)   0.59 mol L-1

Question 2

Which of the following statements is TRUE about the implication of K ≈ 1?

Accepted Answer

A)   At equilibrium, the amount of products is favoured over the amount of reactants.
B)   At equilibrium, the amount of reactants is favoured over the amount of products.
C)   The rate of the reaction is fast.
D)   The reverse reaction is favoured.
E)   Neither the forward nor reverse reaction is strongly favoured; the forward reaction proceeds about halfway.

Question 3

Consider the following reaction and its equilibrium constant: SO2(g)  + NO2(g)  ⇌ SO3(g)  + NO(g)  Kc = 0.33
A reaction mixture contains 0.39 mol L-1 SO2, 0.14 mol L-1 NO2 , 0.11 mol L-1 SO3 and 0.14 mol L-1 NO. Which of the following statements is TRUE concerning this system?

Accepted Answer

A)   The reaction will shift in the direction of reactants.
B)   The equilibrium constant will decrease.
C)   The reaction will shift in the direction of products.
D)   The reaction quotient will decrease.
E)   The system is at equilibrium.

Question 4

Consider the following reaction, equilibrium pressures, and equilibrium constant at a particular temperature. Determine the equilibrium pressure of H2. D2(g)  + H2(g)  ⇌ 2HD(g)  Kp = 1.80
P(D2) eq = 1.1 × 10-3 bar P(HD) eq = 2.7 × 10-3 bar

Accepted Answer

A)   2.7 bar
B)   1.4 bar
C)   0.73 bar
D)   3.7 × 10-3 bar
E)   8.1 × 10-4 bar

Question 5

Consider the following reaction at equilibrium. What effect will adding a catalyst have on the system? 2KClO3(s)  ⇌ 2KCl(s)  + 3O2(g)

Accepted Answer

A)   There will be no change in the equilibrium constant.
B)   The equilibrium constant will decrease.
C)   The reaction will shift in the direction of reactants.
D)   The equilibrium constant will increase.
E)   The reaction will shift in the direction of products.

Question 6

The reaction below has a Kp value of 3.3 × 10-5 bar. What is the value of Kc for this reaction at 700 K? 2SO3(g)  ⇌ 2SO2(g)  + O2(g)

Accepted Answer

A)   5.7 × 10-7 M
B)   1.7 × 106 M
C)   3.3 × 10-5 M
D)   3.0 × 104 M
E)   1.9 × 10-3 M

Question 7

Consider the following reaction and its equilibrium constant: I2(g)  + Br2(g)  ⇌ 2IBr(g)  Kc = 1.1 × 102
A reaction mixture contains 0.41 mol L-1 I2, 0.27 mol L-1 Br2 and 3.5 mol L-1 IBr. Which of the following statements is TRUE concerning this system?

Accepted Answer

A)   The reaction will shift in the direction of products.
B)   The reaction will shift in the direction of reactants.
C)   The reaction quotient will decrease.
D)   The equilibrium constant will increase.
E)   The system is at equilibrium.

Question 8

Consider the following reaction at equilibrium. What effect will increasing the volume of the reaction mixture have on the system? 2H2S(g)  + 3O2(g)  ⇌ 2H2O(g)  + 2SO2(g)

Accepted Answer

A)   The reaction will shift in the direction of products.
B)   No effect will be observed.
C)   The reaction will shift in the direction of reactants.
D)   The equilibrium constant will decrease.
E)   The equilibrium constant will increase.

Question 9

For the reaction: N2(g)  + 2O2(g)  ⇌ 2NO2(g) , Kc = 8.3 × 10-10 M-1 at 25 °C. What is the concentration of N2 gas at equilibrium when the concentration of NO2 is five times the concentration of O2 gas?

Accepted Answer

A)   3.3 × 10-11 mol L-1
B)   1.7 × 10-10 mol L-1
C)   6.0 × 109 mol L-1
D)   3.0 × 1010 mol L-1

Question 10

Explain dynamic equilibrium. Use the generic reaction A(g) ⇌ B(g) to explain.

Accepted Answer

In this reaction, dynamic equilibrium me...

Question 11

Express the equilibrium constant for the following reaction: PCl5(g)  ⇌ PCl3(g)  + Cl2(g)

Accepted Answer

A)   KP = 5(g)  ⇌ PCl3(g)  + Cl2(g)  
A)   KP =   
B)   KP =   
C)   KP =   
D)   KP =   
E)   KP =  " class="answers-bank-image d-inline" rel="preload" >
B)   KP = 5(g)  ⇌ PCl3(g)  + Cl2(g)  
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C)   KP =   
D)   KP =   
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C)   KP = 5(g)  ⇌ PCl3(g)  + Cl2(g)  
A)   KP =   
B)   KP =   
C)   KP =   
D)   KP =   
E)   KP =  " class="answers-bank-image d-inline" rel="preload" >
D)   KP = 5(g)  ⇌ PCl3(g)  + Cl2(g)  
A)   KP =   
B)   KP =   
C)   KP =   
D)   KP =   
E)   KP =  " class="answers-bank-image d-inline" rel="preload" >
E)   KP = 5(g)  ⇌ PCl3(g)  + Cl2(g)  
A)   KP =   
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Question 12

Consider the following reaction and its equilibrium constant: SO2(g)  + NO2(g)  ⇌ SO3(g)  + NO(g)  Kc = 0.33
A reaction mixture contains 1.0 mol L-1 SO2, 0.50 mol L-1 NO2 , 0.50 mol L-1 SO3, and 1.0 mol L-1 NO. Which of the following statements is TRUE concerning this system?

Accepted Answer

A)   The reaction will shift in the direction of reactants.
B)   The equilibrium constant will decrease.
C)   The reaction will shift in the direction of products.
D)   The reaction quotient will decrease.
E)   The system is at equilibrium.

Question 13

Consider the following reaction: NO(g)  + SO3(g)  ⇌ NO2(g)  + SO2(g) 
A reaction mixture initially contains 0.86 bar NO and 0.86 bar SO3. Determine the equilibrium pressure of NO2 if Kp for the reaction at this temperature is 0.0118.

Accepted Answer

A)   0.78 bar
B)   0.084 bar
C)   0.012 bar
D)   0.85 bar
E)   0.048 bar

Question 14

The equilibrium constant is given for two of the reactions below. Determine the value of the missing equilibrium constant. A(g)  + B(g)  ⇌ AB(g)  K = 0.24
AB(g)  + A(g)  ⇌ A2B(g)  K = 3.8
2A(g)  + B(g)  ⇌ A2B(g)  K = ?

Accepted Answer

A)   4.0
B)   0.91
C)   3.6
D)   16
E)   0.63

Question 15

The following reaction is exothermic. Which change will shift the equilibrium to the right? C2H4(g)  + Cl2(g)  ⇌ C2H4Cl2(g)

Accepted Answer

A)   raising the temperature
B)   increasing the pressure
C)   increasing the volume
D)   adding a catalyst

Question 16

Cyclohexane (C6H12)  undergoes a molecular rearrangement in the presence of AlCl3 to form methylcyclopentane (MCP)  according to the equation: C6H12 ⇌ MCP
If Kc = 0.143 at 25 °C for this reaction, predict the direction in which the system will shift if the initial concentrations of C6H12 and MCP are 0. 0400 mol L-1 and 0. 0200 mol L-1, respectively. The system ________.

Accepted Answer

A)   will shift left
B)   will shift right
C)   is already at equilibrium
D)   is not at equilibrium and will remain in an unequilibrated state

Question 17

Consider the following reaction at equilibrium. What effect will adding KCl have on the system? 2KClO3(s)  ⇌ 2KCl(s)  + 3O2(g)

Accepted Answer

A)   No effect will be observed since KCl is a solid and is not included in the equilibrium expression.
B)   The equilibrium constant will decrease.
C)   The reaction will shift in the direction of reactants.
D)   The equilibrium constant will increase.
E)   The reaction will shift in the direction of products.

Question 18

Consider the following reaction at equilibrium. What effect will adding 1 mole of Ar to the reaction mixture have on the system? 2H2S(g)  + 3O2(g)  ⇌ 2H2O(g)  + 2SO2(g)

Accepted Answer

A)   The reaction will shift in the direction of products.
B)   No effect will be observed.
C)   The reaction will shift in the direction of reactants.
D)   The equilibrium constant will decrease.
E)   The equilibrium constant will increase.

Question 19

The reaction below has a Kp value of 41 bar-2. What is the value of Kc for this reaction at 400 K? N2(g)  + 3H2(g)  ⇌ 2NH3(g)

Accepted Answer

A)   2.4 × 10-2 M-2
B)   4.4 × 104 M-2
C)   41 M-2
D)   2.3 × 10-5 M-2
E)   1.9 × 104 M-2

Question 20

For the following reaction, what is Δn required in the conversion of Kc to Kp? N2O4(g)  ⇌ 2NO2(g)

Accepted Answer

A)   3
B)   -1
C)   -2
D)   2
E)   1

Exam 14: Chemical Equilibrium

Consider the following reaction and its equilibrium constant: SO₂(g) + NO₂(g) ⇌ SO₃(g) + NO(g) K_c = 0.33 A reaction mixture contains 0.39 mol L^-1 SO₂, 0.14 mol L^-1 NO₂, 0.11 mol L^-1 SO₃ and 0.14 mol L^-1 NO. Which of the following statements is TRUE concerning this system?

Correct Answer
verified

The following reaction is exothermic. Which change will shift the equilibrium to the right? C₂H₄(g) + Cl₂(g) ⇌ C₂H₄Cl₂(g)

Correct Answer
verified

Consider the following reaction at equilibrium. What effect will adding a catalyst have on the system? 2KClO₃(s) ⇌ 2KCl(s) + 3O₂(g)

Correct Answer
verified

For the following reaction, what is Δn required in the conversion of K_c to K_p? N₂O₄(g) ⇌ 2NO₂(g)

Correct Answer
verified

Consider the following reaction and its equilibrium constant: I₂(g) + Br₂(g) ⇌ 2IBr(g) K_c = 1.1 × 10² A reaction mixture contains 0.41 mol L^-1 I₂, 0.27 mol L^-1 Br₂and 3.5 mol L^-1 IBr. Which of the following statements is TRUE concerning this system?

Correct Answer
verified

Consider the following reaction: CuS(s) + O₂(g) ⇌ Cu(s) + SO₂(g) A reaction mixture initially contains 2.9 mol L^-1 O₂. Determine the equilibrium concentration of O₂ if K_c for the reaction at this temperature is 1.5.

Correct Answer
verified

The equilibrium constant is given for two of the reactions below. Determine the value of the missing equilibrium constant. A(g) + B(g) ⇌ AB(g) K = 0.24 AB(g) + A(g) ⇌ A₂B(g) K = 3.8 2A(g) + B(g) ⇌ A₂B(g) K = ?

Correct Answer
verified

Consider the following reaction, equilibrium pressures, and equilibrium constant at a particular temperature. Determine the equilibrium pressure of H₂. D₂(g) + H₂(g) ⇌ 2HD(g) K_p = 1.80 P(D₂) _eq = 1.1 × 10^-3bar P(HD) _eq = 2.7 × 10^-3 bar

Correct Answer
verified

Consider the following reaction at equilibrium. What effect will adding KCl have on the system? 2KClO₃(s) ⇌ 2KCl(s) + 3O₂(g)

Correct Answer
verified

Consider the following reaction at equilibrium. What effect will increasing the volume of the reaction mixture have on the system? 2H₂S(g) + 3O₂(g) ⇌ 2H₂O(g) + 2SO₂(g)

Correct Answer
verified

Consider the following reaction and its equilibrium constant: SO₂(g) + NO₂(g) ⇌ SO₃(g) + NO(g) K_c = 0.33 A reaction mixture contains 1.0 mol L^-1 SO₂, 0.50 mol L^-1 NO₂, 0.50 mol L^-1 SO₃, and 1.0 mol L^-1 NO. Which of the following statements is TRUE concerning this system?

Correct Answer
verified

The reaction below has a K_p value of 3.3 × 10^-5bar. What is the value of K_c for this reaction at 700 K? 2SO₃(g) ⇌ 2SO₂(g) + O₂(g)

Correct Answer
verified

The reaction below has a K_p value of 41 bar^-2. What is the value of K_c for this reaction at 400 K? N₂(g) + 3H₂(g) ⇌ 2NH₃(g)

Correct Answer
verified

Express the equilibrium constant for the following reaction: PCl₅(g) ⇌ PCl₃(g) + Cl₂(g)

Correct Answer
verified

Correct Answer
verified

Consider the following reaction at equilibrium. What effect will adding 1 mole of Ar to the reaction mixture have on the system? 2H₂S(g) + 3O₂(g) ⇌ 2H₂O(g) + 2SO₂(g)

Correct Answer
verified

For the reaction: N₂(g) + 2O₂(g) ⇌ 2NO₂(g) , K_c = 8.3 × 10^-10 M^-1at 25 °C. What is the concentration of N₂ gas at equilibrium when the concentration of NO₂ is five times the concentration of O₂ gas?

Correct Answer
verified

Explain dynamic equilibrium. Use the generic reaction A(g) ⇌ B(g) to explain.

Correct Answer
verified
In this reaction, dynamic equilibrium me...
View Answer

Which of the following statements is TRUE about the implication of K ≈ 1?

Correct Answer
verified

Consider the following reaction: NO(g) + SO₃(g) ⇌ NO₂(g) + SO₂(g) A reaction mixture initially contains 0.86 bar NO and 0.86 bar SO₃. Determine the equilibrium pressure of NO₂ if K_p for the reaction at this temperature is 0.0118.

Correct Answer
verified

Exam 14: Chemical Equilibrium

Consider the following reaction and its equilibrium constant: SO2(g) + NO2(g) ⇌ SO3(g) + NO(g) Kc = 0.33 A reaction mixture contains 0.39 mol L-1 SO2, 0.14 mol L-1 NO2 , 0.11 mol L-1 SO3 and 0.14 mol L-1 NO. Which of the following statements is TRUE concerning this system?

Correct AnswerverifiedShow Answer

The following reaction is exothermic. Which change will shift the equilibrium to the right? C2H4(g) + Cl2(g) ⇌ C2H4Cl2(g)

Correct AnswerverifiedShow Answer

Consider the following reaction at equilibrium. What effect will adding a catalyst have on the system? 2KClO3(s) ⇌ 2KCl(s) + 3O2(g)

Correct AnswerverifiedShow Answer

For the following reaction, what is Δn required in the conversion of Kc to Kp? N2O4(g) ⇌ 2NO2(g)

Correct AnswerverifiedShow Answer

Consider the following reaction and its equilibrium constant: I2(g) + Br2(g) ⇌ 2IBr(g) Kc = 1.1 × 102 A reaction mixture contains 0.41 mol L-1 I2, 0.27 mol L-1 Br2 and 3.5 mol L-1 IBr. Which of the following statements is TRUE concerning this system?

Correct AnswerverifiedShow Answer

Consider the following reaction: CuS(s) + O2(g) ⇌ Cu(s) + SO2(g) A reaction mixture initially contains 2.9 mol L-1 O2. Determine the equilibrium concentration of O2 if Kc for the reaction at this temperature is 1.5.

Correct AnswerverifiedShow Answer

The equilibrium constant is given for two of the reactions below. Determine the value of the missing equilibrium constant. A(g) + B(g) ⇌ AB(g) K = 0.24 AB(g) + A(g) ⇌ A2B(g) K = 3.8 2A(g) + B(g) ⇌ A2B(g) K = ?

Correct AnswerverifiedShow Answer

Consider the following reaction, equilibrium pressures, and equilibrium constant at a particular temperature. Determine the equilibrium pressure of H2. D2(g) + H2(g) ⇌ 2HD(g) Kp = 1.80 P(D2) eq = 1.1 × 10-3 bar P(HD) eq = 2.7 × 10-3 bar

Correct AnswerverifiedShow Answer

Consider the following reaction at equilibrium. What effect will adding KCl have on the system? 2KClO3(s) ⇌ 2KCl(s) + 3O2(g)

Correct AnswerverifiedShow Answer

Consider the following reaction at equilibrium. What effect will increasing the volume of the reaction mixture have on the system? 2H2S(g) + 3O2(g) ⇌ 2H2O(g) + 2SO2(g)

Correct AnswerverifiedShow Answer

Consider the following reaction and its equilibrium constant: SO2(g) + NO2(g) ⇌ SO3(g) + NO(g) Kc = 0.33 A reaction mixture contains 1.0 mol L-1 SO2, 0.50 mol L-1 NO2 , 0.50 mol L-1 SO3, and 1.0 mol L-1 NO. Which of the following statements is TRUE concerning this system?

Correct AnswerverifiedShow Answer

The reaction below has a Kp value of 3.3 × 10-5 bar. What is the value of Kc for this reaction at 700 K? 2SO3(g) ⇌ 2SO2(g) + O2(g)

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The reaction below has a Kp value of 41 bar-2. What is the value of Kc for this reaction at 400 K? N2(g) + 3H2(g) ⇌ 2NH3(g)

Correct AnswerverifiedShow Answer

Express the equilibrium constant for the following reaction: PCl5(g) ⇌ PCl3(g) + Cl2(g)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Consider the following reaction at equilibrium. What effect will adding 1 mole of Ar to the reaction mixture have on the system? 2H2S(g) + 3O2(g) ⇌ 2H2O(g) + 2SO2(g)

Correct AnswerverifiedShow Answer

For the reaction: N2(g) + 2O2(g) ⇌ 2NO2(g) , Kc = 8.3 × 10-10 M-1 at 25 °C. What is the concentration of N2 gas at equilibrium when the concentration of NO2 is five times the concentration of O2 gas?

Correct AnswerverifiedShow Answer

Explain dynamic equilibrium. Use the generic reaction A(g) ⇌ B(g) to explain.

Correct AnswerverifiedIn this reaction, dynamic equilibrium me...View AnswerShow Answer

Which of the following statements is TRUE about the implication of K ≈ 1?

Correct AnswerverifiedShow Answer

Consider the following reaction: NO(g) + SO3(g) ⇌ NO2(g) + SO2(g) A reaction mixture initially contains 0.86 bar NO and 0.86 bar SO3. Determine the equilibrium pressure of NO2 if Kp for the reaction at this temperature is 0.0118.

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Consider the following reaction and its equilibrium constant: SO₂(g) + NO₂(g) ⇌ SO₃(g) + NO(g) K_c = 0.33 A reaction mixture contains 0.39 mol L^-1 SO₂, 0.14 mol L^-1 NO₂, 0.11 mol L^-1 SO₃ and 0.14 mol L^-1 NO. Which of the following statements is TRUE concerning this system?

Correct Answer
verified

The following reaction is exothermic. Which change will shift the equilibrium to the right? C₂H₄(g) + Cl₂(g) ⇌ C₂H₄Cl₂(g)

Correct Answer
verified

Consider the following reaction at equilibrium. What effect will adding a catalyst have on the system? 2KClO₃(s) ⇌ 2KCl(s) + 3O₂(g)

Correct Answer
verified

For the following reaction, what is Δn required in the conversion of K_c to K_p? N₂O₄(g) ⇌ 2NO₂(g)

Correct Answer
verified

Consider the following reaction and its equilibrium constant: I₂(g) + Br₂(g) ⇌ 2IBr(g) K_c = 1.1 × 10² A reaction mixture contains 0.41 mol L^-1 I₂, 0.27 mol L^-1 Br₂and 3.5 mol L^-1 IBr. Which of the following statements is TRUE concerning this system?

Correct Answer
verified

Consider the following reaction: CuS(s) + O₂(g) ⇌ Cu(s) + SO₂(g) A reaction mixture initially contains 2.9 mol L^-1 O₂. Determine the equilibrium concentration of O₂ if K_c for the reaction at this temperature is 1.5.

Correct Answer
verified

The equilibrium constant is given for two of the reactions below. Determine the value of the missing equilibrium constant. A(g) + B(g) ⇌ AB(g) K = 0.24 AB(g) + A(g) ⇌ A₂B(g) K = 3.8 2A(g) + B(g) ⇌ A₂B(g) K = ?

Correct Answer
verified

Consider the following reaction, equilibrium pressures, and equilibrium constant at a particular temperature. Determine the equilibrium pressure of H₂. D₂(g) + H₂(g) ⇌ 2HD(g) K_p = 1.80 P(D₂) _eq = 1.1 × 10^-3bar P(HD) _eq = 2.7 × 10^-3 bar

Correct Answer
verified

Consider the following reaction at equilibrium. What effect will adding KCl have on the system? 2KClO₃(s) ⇌ 2KCl(s) + 3O₂(g)

Correct Answer
verified

Consider the following reaction at equilibrium. What effect will increasing the volume of the reaction mixture have on the system? 2H₂S(g) + 3O₂(g) ⇌ 2H₂O(g) + 2SO₂(g)

Correct Answer
verified

Consider the following reaction and its equilibrium constant: SO₂(g) + NO₂(g) ⇌ SO₃(g) + NO(g) K_c = 0.33 A reaction mixture contains 1.0 mol L^-1 SO₂, 0.50 mol L^-1 NO₂, 0.50 mol L^-1 SO₃, and 1.0 mol L^-1 NO. Which of the following statements is TRUE concerning this system?

Correct Answer
verified

The reaction below has a K_p value of 3.3 × 10^-5bar. What is the value of K_c for this reaction at 700 K? 2SO₃(g) ⇌ 2SO₂(g) + O₂(g)

Correct Answer
verified

The reaction below has a K_p value of 41 bar^-2. What is the value of K_c for this reaction at 400 K? N₂(g) + 3H₂(g) ⇌ 2NH₃(g)

Correct Answer
verified

Express the equilibrium constant for the following reaction: PCl₅(g) ⇌ PCl₃(g) + Cl₂(g)

Correct Answer
verified

Correct Answer
verified

Consider the following reaction at equilibrium. What effect will adding 1 mole of Ar to the reaction mixture have on the system? 2H₂S(g) + 3O₂(g) ⇌ 2H₂O(g) + 2SO₂(g)

Correct Answer
verified

For the reaction: N₂(g) + 2O₂(g) ⇌ 2NO₂(g) , K_c = 8.3 × 10^-10 M^-1at 25 °C. What is the concentration of N₂ gas at equilibrium when the concentration of NO₂ is five times the concentration of O₂ gas?

Correct Answer
verified

Correct Answer
verified
In this reaction, dynamic equilibrium me...
View Answer

Correct Answer
verified

Consider the following reaction: NO(g) + SO₃(g) ⇌ NO₂(g) + SO₂(g) A reaction mixture initially contains 0.86 bar NO and 0.86 bar SO₃. Determine the equilibrium pressure of NO₂ if K_p for the reaction at this temperature is 0.0118.

Correct Answer
verified