Question 1

The reaction quotient, Qc, for a reaction has a value of 75 while the equilibrium constant, Kc, has a value of 195. Which of the following statements is accurate?

Accepted Answer

A)  The reaction must proceed to the left to establish equilibrium.
B)  The reaction must proceed to the right to establish equilibrium.
C)  The concentrations of the products will be much smaller than the concentrations of the reactants when the system is at equilibrium.
D)  The concentrations of the products will be about the same as the concentrations of the reactants when the system is at equilibrium.
E)  None of these choices are correct.F) C) and E)
G) A) and B)

Question 2

Write the mass-action expression, Qc, for the following chemical reaction equation. 2C6H6(g)  + 15O2(g)  ⇄ 12CO2(g)  + 6H2O(g)

Accepted Answer

A)   c, for the following chemical reaction equation. 2C6H6(g)  + 15O2(g)  ⇄ 12CO2(g)  + 6H2O(g)  
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
B)   c, for the following chemical reaction equation. 2C6H6(g)  + 15O2(g)  ⇄ 12CO2(g)  + 6H2O(g)  
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
C)   c, for the following chemical reaction equation. 2C6H6(g)  + 15O2(g)  ⇄ 12CO2(g)  + 6H2O(g)  
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
D)   c, for the following chemical reaction equation. 2C6H6(g)  + 15O2(g)  ⇄ 12CO2(g)  + 6H2O(g)  
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
E)   c, for the following chemical reaction equation. 2C6H6(g)  + 15O2(g)  ⇄ 12CO2(g)  + 6H2O(g)  
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >F) A) and E)
G) D) and E)

Question 3

Carbon monoxide and chlorine combine in an equilibrium reaction to produce the highly toxic product, phosgene (COCl2)  CO(g)  + Cl2(g)  ⇄ COCl2(g) 
If the equilibrium constant for this reaction is Kc = 248, predict, if possible, what will happen when the reactants and product are combined with the concentrations shown.
[CO] = [Cl2] = 0.0200 M; [COCl2] = 0.0992 M

Accepted Answer

A)  The reaction will proceed to the right.
B)  The reaction will proceed to the left.
C)  The reaction is at equilibrium, and no change in concentrations will occur.
D)  The container volume needs to be specified before a prediction can be made.
E)  The temperature needs to be specified before a prediction can be made.F) A) and B)
G) All of the above

Question 4

Consider the reversible reaction: 2NO2(g)  ⇄ N2O4(g)  If the concentrations of both NO2 and N2O4 are 0.016 mol L−1, what is the value of Qc?

Accepted Answer

A)  0.016
B)  0.50
C)  1.0
D)  2.0
E)  63F) A) and B)
G) All of the above

Question 5

The reaction system POCl3(g)  ⇄ POCl(g)  + Cl2(g) 
Is at equilibrium. Which of the following statements describes the behavior of the system if POCl is added to the container?

Accepted Answer

A)  The forward reaction will proceed to establish equilibrium.
B)  The reverse reaction will proceed to establish equilibrium.
C)  The partial pressures of POCl 3 and POCl will remain steady while the partial pressure of chlorine increases.
D)  The partial pressure of chlorine remains steady while the partial pressures of POCl 3 and POCl increase.
E)  The partial pressure of chlorine will increase while the partial pressure of POCl decreases.F) All of the above
G) D) and E)

Question 6

In water, the following equilibrium exists: H+(aq)  + OH−(aq)  ⇄ H2O(l) 
In pure water at 25°C, the concentration of H+ ions is 1.00 × 10−7 mol/L. Calculate the value of the equilibrium constant for the reaction as written above.

Accepted Answer

A)  1.00 × 10 14
B)  1.00 × 10 12
C)  1.00 × 10 −14
D)  1.00 × 10 −12
E)  5.55 × 10 15F) D) and E)
G) A) and E)

Question 7

At a certain temperature the reaction CO2(g)  + H2(g)  ⇄ CO(g)  + H2O(g) 2
Has Kc = 2.50. If 2.00 mol of carbon dioxide and 1.5 mol of hydrogen are placed in a 5.00 L vessel and equilibrium is established, what will be the concentration of carbon monoxide?

Accepted Answer

A)  0.091 M
B)  0.191 M
C)  0.209 M
D)  0.913 M
E)  1.05 MF) A) and B)
G) C) and E)

Question 8

Carbon monoxide and chlorine combine in an equilibrium reaction to produce the highly toxic product, phosgene (COCl2)  CO(g)  + Cl2(g)  ⇄ COCl2(g) 
If the equilibrium constant for this reaction is Kc = 248, predict, if possible, what will happen when the reactants and product are combined with the concentrations shown.
[CO] = [Cl2] = 0.010 M; [COCl2] = 0.070 M

Accepted Answer

A)  The reaction will proceed to the right.
B)  The reaction will proceed to the left.
C)  The reaction is at equilibrium, and no change in concentrations will occur.
D)  The container volume needs to be specified before a prediction can be made.
E)  The temperature needs to be specified before a prediction can be made.F) C) and E)
G) B) and E)

Question 9

At high temperatures, carbon reacts with O2 to produce CO as follows: C(s)  + O2(g)  ⇄ 2CO(g) .
When 0.350 mol of O2 and excess carbon were placed in a 5.00-L container and heated, the equilibrium concentration of CO was found to be 0.060 M. What is the equilibrium constant, Kc, for this reaction?

Accepted Answer

A)  0.010
B)  0.072
C)  0.090
D)  0.17
E)  1.2F) All of the above
G) A) and B)

Question 10

When a reaction system reaches equilibrium, the forward and reverse reactions stop.

Accepted Answer

A) True 
 B)False

Question 11

Consider the equilibrium reaction: H2(g)  + Br2(g)  ⇄ 2HBr(g)  Which of the following correctly describes the relationship between Kc and Kp for the reaction?

Accepted Answer

A)  K p = K c
B)  K p = ( RT) K c
C)  K p = ( RT) 2 K c
D)  K p = K c / RT
E)  K p = K c / ( RT) 2F) C) and D)
G) A) and D)

Question 12

Consider the equilibrium reaction shown below. B2(g)  ⇄ 2B(g) 
If the rate constants are: kfwd = 7.00 × 10−5s−1 and krev = 2.00 × 10−5 L mol−1 s−1, what is the value of Kc under these conditions?

Accepted Answer

A)  1.75 × 10 5
B)  3.50
C)  0.286
D)  5.71 × 10 −6
E)  1.40 × 10 −10F) A) and B)
G) B) and C)

Question 13

The reaction system CS2(g)  + 4H2(g)  ⇄ CH4(g)  + 2H2S(g) 
Is at equilibrium. Which of the following statements describes the behavior of the system if the partial pressure of carbon disulfide is reduced?

Accepted Answer

A)  As equilibrium is reestablished, the partial pressure of carbon disulfide increases.
B)  As equilibrium is reestablished, the partial pressure of hydrogen decreases.
C)  As equilibrium is reestablished, the partial pressure of methane, CH 4, increases.
D)  As equilibrium is reestablished, the partial pressures of hydrogen and hydrogen sulfide decrease.
E)  As equilibrium is reestablished, all the partial pressures will increase.F) D) and E)
G) A) and E)

Question 14

The equilibrium constant for the reaction of bromine with chlorine to form bromine monochloride is 58.0 at a certain temperature. Br2(g)  + Cl2(g)  ⇄ 2BrCl(g) 
What is the equilibrium constant for the following reaction?
BrCl(g)  ⇄ ½Br2(g)  + ½Cl2(g)

Accepted Answer

A)  2.97 × 10 −4
B)  1.72 × 10 −2
C)  3.45 × 10 −2
D)  1.31 × 10 −1
E)  > 1.00F) B) and D)
G) D) and E)

Question 15

Changing the amount of a solid reactant or product in an equilibrium reaction will not affect the amounts of the other reactants and products present at equilibrium.

Accepted Answer

A) True 
 B)False

Question 16

Consider the following two equilibria and their respective equilibrium constants: (1)  NO(g)  + ½O2(g)  ⇄ NO2(g) 
(2)  2NO2(g)  ⇄ 2NO(g)  + O2(g) 
Which one of the following is the correct relationship between the equilibrium constants K1 and K2?

Accepted Answer

A)  K 2 = 2/ K 1
B)  K 2 = (1/ K 1) 2
C)  K 2 = − K 1/2
D)  K 2 = 1/(2 K 1) 
E)  K 2 = 1/(2 K 1) 2F) A) and E)
G) B) and C)

Question 17

Unless ΔH°rxn = 0, a change in temperature will affect the value of the equilibrium constant Kc.

Accepted Answer

A) True 
 B)False

Question 18

The equilibrium constant, Kc, for the decomposition of COBr2 COBr2(g)  ⇄ CO(g)  + Br2(g) 
Is 0.190. What is Kc for the following reaction?
2CO(g)  + 2Br2(g)  ⇄ 2COBr2(g)

Accepted Answer

A)  0.0361
B)  2.63
C)  5.62
D)  10.5
E)  27.7F) A) and E)
G) None of the above

Question 19

What is the mass-action expression, Qc, for the following chemical reaction? PbO(s)  + CO(g)  ⇄ Pb(l)  + CO2(g)

Accepted Answer

A)   c, for the following chemical reaction? PbO(s)  + CO(g)  ⇄ Pb(l)  + CO2(g)  
A)     
B)     
C)     
D)     
E)  None of these choices are correct." class="answers-bank-image d-inline" rel="preload" >
B)   c, for the following chemical reaction? PbO(s)  + CO(g)  ⇄ Pb(l)  + CO2(g)  
A)     
B)     
C)     
D)     
E)  None of these choices are correct." class="answers-bank-image d-inline" rel="preload" >
C)   c, for the following chemical reaction? PbO(s)  + CO(g)  ⇄ Pb(l)  + CO2(g)  
A)     
B)     
C)     
D)     
E)  None of these choices are correct." class="answers-bank-image d-inline" rel="preload" >
D)   c, for the following chemical reaction? PbO(s)  + CO(g)  ⇄ Pb(l)  + CO2(g)  
A)     
B)     
C)     
D)     
E)  None of these choices are correct." class="answers-bank-image d-inline" rel="preload" >
E)  None of these choices are correct.F) B) and D)
G) C) and D)

Question 20

At 850°C, the equilibrium constant Kp for the reaction C(s)  + CO2(g)  ⇄ 2CO(g) 
Has a value of 10.7. If the total pressure in the system at equilibrium is 1.000 atm, what is the partial pressure of carbon monoxide?

Accepted Answer

A)  0.362 atm
B)  0.489 atm
C)  0.667 atm
D)  0.915 atm
E)  0.921 atmF) D) and E)
G) A) and B)

Exam 17: Equilibrium: the Extent of Chemical Reactions

At a certain temperature the reaction CO₂(g) + H₂(g) ⇄ CO(g) + H₂O(g) ₂ Has K_c = 2.50. If 2.00 mol of carbon dioxide and 1.5 mol of hydrogen are placed in a 5.00 L vessel and equilibrium is established, what will be the concentration of carbon monoxide?

Correct Answer
verified

The equilibrium constant for the reaction of bromine with chlorine to form bromine monochloride is 58.0 at a certain temperature. Br₂(g) + Cl₂(g) ⇄ 2BrCl(g) What is the equilibrium constant for the following reaction? BrCl(g) ⇄ ½Br₂(g) + ½Cl₂(g)

Correct Answer
verified

At 850°C, the equilibrium constant K_p for the reaction C(s) + CO₂(g) ⇄ 2CO(g) Has a value of 10.7. If the total pressure in the system at equilibrium is 1.000 atm, what is the partial pressure of carbon monoxide?

Correct Answer
verified

The equilibrium constant, K_c, for the decomposition of COBr₂ COBr₂(g) ⇄ CO(g) + Br₂(g) Is 0.190. What is K_c for the following reaction? 2CO(g) + 2Br₂(g) ⇄ 2COBr₂(g)

Correct Answer
verified

When a reaction system reaches equilibrium, the forward and reverse reactions stop.

Correct Answer
verified

Consider the reversible reaction: 2NO₂(g) ⇄ N₂O₄(g) If the concentrations of both NO₂and N₂O₄ are 0.016 mol L⁻¹, what is the value of Q_c?

Correct Answer
verified

Unless ΔH°_rxn = 0, a change in temperature will affect the value of the equilibrium constant K_c.

Correct Answer
verified

Consider the equilibrium reaction: H₂(g) + Br₂(g) ⇄ 2HBr(g) Which of the following correctly describes the relationship between K_c and K_p for the reaction?

Correct Answer
verified

Write the mass-action expression, Q_c, for the following chemical reaction equation. 2C₆H₆(g) + 15O₂(g) ⇄ 12CO₂(g) + 6H₂O(g)

Correct Answer
verified

Correct Answer
verified

Changing the amount of a solid reactant or product in an equilibrium reaction will not affect the amounts of the other reactants and products present at equilibrium.

Correct Answer
verified

In water, the following equilibrium exists: H⁺(aq) + OH⁻(aq) ⇄ H₂O(l) In pure water at 25°C, the concentration of H⁺ ions is 1.00 × 10⁻⁷ mol/L. Calculate the value of the equilibrium constant for the reaction as written above.

Correct Answer
verified

What is the mass-action expression, Q_c, for the following chemical reaction? PbO(s) + CO(g) ⇄ Pb(l) + CO₂(g)

Correct Answer
verified

The reaction quotient, Q_c, for a reaction has a value of 75 while the equilibrium constant, K_c, has a value of 195. Which of the following statements is accurate?

Correct Answer
verified

The reaction system CS₂(g) + 4H₂(g) ⇄ CH₄(g) + 2H₂S(g) Is at equilibrium. Which of the following statements describes the behavior of the system if the partial pressure of carbon disulfide is reduced?

Correct Answer
verified

Correct Answer
verified

The reaction system POCl₃(g) ⇄ POCl(g) + Cl₂(g) Is at equilibrium. Which of the following statements describes the behavior of the system if POCl is added to the container?

Correct Answer
verified

Consider the following two equilibria and their respective equilibrium constants: (1) NO(g) + ½O₂(g) ⇄ NO₂(g) (2) 2NO₂(g) ⇄ 2NO(g) + O₂(g) Which one of the following is the correct relationship between the equilibrium constants K₁ and K₂?

Correct Answer
verified

Correct Answer
verified

Consider the equilibrium reaction shown below. B₂(g) ⇄ 2B(g) If the rate constants are: k_fwd = 7.00 × 10⁻⁵s⁻¹ and k_rev = 2.00 × 10⁻⁵ L mol⁻¹s⁻¹, what is the value of K_c under these conditions?

Correct Answer
verified

Exam 17: Equilibrium: the Extent of Chemical Reactions

At a certain temperature the reaction CO2(g) + H2(g) ⇄ CO(g) + H2O(g) 2 Has Kc = 2.50. If 2.00 mol of carbon dioxide and 1.5 mol of hydrogen are placed in a 5.00 L vessel and equilibrium is established, what will be the concentration of carbon monoxide?

Correct AnswerverifiedShow Answer

The equilibrium constant for the reaction of bromine with chlorine to form bromine monochloride is 58.0 at a certain temperature. Br2(g) + Cl2(g) ⇄ 2BrCl(g) What is the equilibrium constant for the following reaction? BrCl(g) ⇄ ½Br2(g) + ½Cl2(g)

Correct AnswerverifiedShow Answer

At 850°C, the equilibrium constant Kp for the reaction C(s) + CO2(g) ⇄ 2CO(g) Has a value of 10.7. If the total pressure in the system at equilibrium is 1.000 atm, what is the partial pressure of carbon monoxide?

Correct AnswerverifiedShow Answer

The equilibrium constant, Kc, for the decomposition of COBr2 COBr2(g) ⇄ CO(g) + Br2(g) Is 0.190. What is Kc for the following reaction? 2CO(g) + 2Br2(g) ⇄ 2COBr2(g)

Correct AnswerverifiedShow Answer

When a reaction system reaches equilibrium, the forward and reverse reactions stop.

Correct AnswerverifiedShow Answer

Consider the reversible reaction: 2NO2(g) ⇄ N2O4(g) If the concentrations of both NO2 and N2O4 are 0.016 mol L−1, what is the value of Qc?

Correct AnswerverifiedShow Answer

Unless ΔH°rxn = 0, a change in temperature will affect the value of the equilibrium constant Kc.

Correct AnswerverifiedShow Answer

Consider the equilibrium reaction: H2(g) + Br2(g) ⇄ 2HBr(g) Which of the following correctly describes the relationship between Kc and Kp for the reaction?

Correct AnswerverifiedShow Answer

Write the mass-action expression, Qc, for the following chemical reaction equation. 2C6H6(g) + 15O2(g) ⇄ 12CO2(g) + 6H2O(g)

Correct AnswerverifiedShow Answer

At high temperatures, carbon reacts with O2 to produce CO as follows: C(s) + O2(g) ⇄ 2CO(g) . When 0.350 mol of O2 and excess carbon were placed in a 5.00-L container and heated, the equilibrium concentration of CO was found to be 0.060 M. What is the equilibrium constant, Kc, for this reaction?

Correct AnswerverifiedShow Answer

Changing the amount of a solid reactant or product in an equilibrium reaction will not affect the amounts of the other reactants and products present at equilibrium.

Correct AnswerverifiedShow Answer

In water, the following equilibrium exists: H+(aq) + OH−(aq) ⇄ H2O(l) In pure water at 25°C, the concentration of H+ ions is 1.00 × 10−7 mol/L. Calculate the value of the equilibrium constant for the reaction as written above.

Correct AnswerverifiedShow Answer

What is the mass-action expression, Qc, for the following chemical reaction? PbO(s) + CO(g) ⇄ Pb(l) + CO2(g)

Correct AnswerverifiedShow Answer

The reaction quotient, Qc, for a reaction has a value of 75 while the equilibrium constant, Kc, has a value of 195. Which of the following statements is accurate?

Correct AnswerverifiedShow Answer

The reaction system CS2(g) + 4H2(g) ⇄ CH4(g) + 2H2S(g) Is at equilibrium. Which of the following statements describes the behavior of the system if the partial pressure of carbon disulfide is reduced?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The reaction system POCl3(g) ⇄ POCl(g) + Cl2(g) Is at equilibrium. Which of the following statements describes the behavior of the system if POCl is added to the container?

Correct AnswerverifiedShow Answer

Consider the following two equilibria and their respective equilibrium constants: (1) NO(g) + ½O2(g) ⇄ NO2(g) (2) 2NO2(g) ⇄ 2NO(g) + O2(g) Which one of the following is the correct relationship between the equilibrium constants K1 and K2?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Consider the equilibrium reaction shown below. B2(g) ⇄ 2B(g) If the rate constants are: kfwd = 7.00 × 10−5s−1 and krev = 2.00 × 10−5 L mol−1 s−1, what is the value of Kc under these conditions?

Correct AnswerverifiedShow Answer

At a certain temperature the reaction CO₂(g) + H₂(g) ⇄ CO(g) + H₂O(g) ₂ Has K_c = 2.50. If 2.00 mol of carbon dioxide and 1.5 mol of hydrogen are placed in a 5.00 L vessel and equilibrium is established, what will be the concentration of carbon monoxide?

Correct Answer
verified

The equilibrium constant for the reaction of bromine with chlorine to form bromine monochloride is 58.0 at a certain temperature. Br₂(g) + Cl₂(g) ⇄ 2BrCl(g) What is the equilibrium constant for the following reaction? BrCl(g) ⇄ ½Br₂(g) + ½Cl₂(g)

Correct Answer
verified

At 850°C, the equilibrium constant K_p for the reaction C(s) + CO₂(g) ⇄ 2CO(g) Has a value of 10.7. If the total pressure in the system at equilibrium is 1.000 atm, what is the partial pressure of carbon monoxide?

Correct Answer
verified

The equilibrium constant, K_c, for the decomposition of COBr₂ COBr₂(g) ⇄ CO(g) + Br₂(g) Is 0.190. What is K_c for the following reaction? 2CO(g) + 2Br₂(g) ⇄ 2COBr₂(g)

Correct Answer
verified

Correct Answer
verified

Consider the reversible reaction: 2NO₂(g) ⇄ N₂O₄(g) If the concentrations of both NO₂and N₂O₄ are 0.016 mol L⁻¹, what is the value of Q_c?

Correct Answer
verified

Unless ΔH°_rxn = 0, a change in temperature will affect the value of the equilibrium constant K_c.

Correct Answer
verified

Consider the equilibrium reaction: H₂(g) + Br₂(g) ⇄ 2HBr(g) Which of the following correctly describes the relationship between K_c and K_p for the reaction?

Correct Answer
verified

Write the mass-action expression, Q_c, for the following chemical reaction equation. 2C₆H₆(g) + 15O₂(g) ⇄ 12CO₂(g) + 6H₂O(g)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

In water, the following equilibrium exists: H⁺(aq) + OH⁻(aq) ⇄ H₂O(l) In pure water at 25°C, the concentration of H⁺ ions is 1.00 × 10⁻⁷ mol/L. Calculate the value of the equilibrium constant for the reaction as written above.

Correct Answer
verified

What is the mass-action expression, Q_c, for the following chemical reaction? PbO(s) + CO(g) ⇄ Pb(l) + CO₂(g)

Correct Answer
verified

The reaction quotient, Q_c, for a reaction has a value of 75 while the equilibrium constant, K_c, has a value of 195. Which of the following statements is accurate?

Correct Answer
verified

The reaction system CS₂(g) + 4H₂(g) ⇄ CH₄(g) + 2H₂S(g) Is at equilibrium. Which of the following statements describes the behavior of the system if the partial pressure of carbon disulfide is reduced?

Correct Answer
verified

Correct Answer
verified

The reaction system POCl₃(g) ⇄ POCl(g) + Cl₂(g) Is at equilibrium. Which of the following statements describes the behavior of the system if POCl is added to the container?

Correct Answer
verified

Consider the following two equilibria and their respective equilibrium constants: (1) NO(g) + ½O₂(g) ⇄ NO₂(g) (2) 2NO₂(g) ⇄ 2NO(g) + O₂(g) Which one of the following is the correct relationship between the equilibrium constants K₁ and K₂?

Correct Answer
verified

Correct Answer
verified

Consider the equilibrium reaction shown below. B₂(g) ⇄ 2B(g) If the rate constants are: k_fwd = 7.00 × 10⁻⁵s⁻¹ and k_rev = 2.00 × 10⁻⁵ L mol⁻¹s⁻¹, what is the value of K_c under these conditions?

Correct Answer
verified