Question 1

For the reaction 2 A + B2 ⇌ 2 AB,the rate of the forward reaction is 0.75 M/s and the rate of the reverse reaction is 0.25 M/s.The reaction is not at equilibrium.In order to attain equilibrium the reaction must proceed in the ________ (forward,reverse)direction in order to achieve equilibrium.

Accepted Answer

Question 2

For a homogeneous equilibrium of gases,which of the following changes in reaction conditions will not alter the equilibrium concentrations?

Accepted Answer

A)  addition of an inert gas to the reaction mixture
B)  addition of products
C)  increasing the volumee
D)  increasing the temperature

Question 3

Shown below is a concentration vs.time plot for the reaction A ⇌ B.For this reaction the value of the equilibrium constant is c c = 0. C) Kc = 1. D) Kc > 1." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  Kc 
B)  Kc = 0.
C)  Kc = 1.
D)  Kc > 1.

Question 4

Find the equilibrium constant for the reaction: A(g) + B(g) ⇌ 2C(g) at 25°C when k equals 1.4 × 10-12 M-1s-1 for the reaction A(g) + B(g) → 2C(g) at 25°C and k equals 2.7 × 10-13 M-1s-1 for the reaction: -12 M-1s-1 for the reaction A(g) + B(g) → 2C(g) at 25°C and k equals 2.7 × 10-13 M-1s-1 for the reaction:   A) 3.8 × 10-25 B) 1.7 × 10-12 C) 1.1 × 10-12 D) 5.2" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  3.8 × 10-25
B)  1.7 × 10-12
C)  1.1 × 10-12
D)  5.2

Question 5

Given the hypothetical reaction: 2 A(s) + x B(g) ⇌ 3 C(g) ,Kp = 0.0105 and Kc = 0.45 at 250°C.What is the value of the coefficient x?

Accepted Answer

A)  1
B)  2
C)  3
D)  4

Question 6

A 1.50 L vessel contains an equilibrium mixture of 0.100 mol of NO,0.150 mol of Br2,and 0.250 mol of NOBr at 25°C.What is the value of Kp for the reaction below? 2 NO(g) + Br2(g) ⇌ 2 NOBr(g)

Accepted Answer

A)  2.56
B)  62.5
C)  1.28 × 102
D)  1.53 × 103

Question 7

The reaction CaCO3(s)⇌ CaO(s)+ O2(g)is endothermic 298 K.The effect of adding a catalyst to the system at equilibrium will ________ (decrease,increase,have no effect on)the total quantity of CaCO3 once equilibrium is reestablished.

Accepted Answer

Question 8

At 25°C,a certain first order reaction has a rate constant equal to 1.00 × 10-3 s-1 and an equilibrium constant,Kc,equal to 4.18.What is the rate constant for the reverse reaction?

Accepted Answer

A)  2.39 × 10-4 s-1
B)  4.18 × 10-3 s-1
C)  2.39 × 102 s-1
D)  4.18 × 103 s-1

Question 9

"If a stress is applied to a reaction mixture at equilibrium,the reaction occurs in the direction that will relieve the stress." This statement is called

Accepted Answer

A)  the Third Law of Thermodynamics.
B)  the Law of Combining Volumes.
C)  the Law of Mass Action.
D)  Le Châtelier's principle.

Question 10

Picture (1) represents an equilibrium mixture of solid CaCO3,solid CaO,and gaseous CO2,obtained as a result of the endothermic decomposition of CaCO3. 3,solid CaO,and gaseous CO2,obtained as a result of the endothermic decomposition of CaCO3.   -Which picture (2) -(4) represents the equilibrium mixture when more solid CaCO3 is added? A) picture (2)  B) picture (3)  C) picture (4)  D) All of these" class="answers-bank-image d-inline" rel="preload" >
-Which picture (2) -(4) represents the equilibrium mixture when more solid CaCO3 is added?

Accepted Answer

A)  picture (2) 
B)  picture (3) 
C)  picture (4) 
D)  All of these

Question 11

Picture (1) represents an equilibrium mixture of solid CaCO3,solid CaO,and gaseous CO2,obtained as a result of the endothermic decomposition of CaCO3. 3,solid CaO,and gaseous CO2,obtained as a result of the endothermic decomposition of CaCO3.   -Which picture (2) -(4) represents the equilibrium mixture when more solid CaO is added? A) picture (2)  B) picture (3)  C) picture (4)  D) All of these" class="answers-bank-image d-inline" rel="preload" >
-Which picture (2) -(4) represents the equilibrium mixture when more solid CaO is added?

Accepted Answer

A)  picture (2) 
B)  picture (3) 
C)  picture (4) 
D)  All of these

Question 12

Picture (1) represents an equilibrium mixture of solid CaCO3,solid CaO,and gaseous CO2,obtained as a result of the endothermic decomposition of CaCO3. 3,solid CaO,and gaseous CO2,obtained as a result of the endothermic decomposition of CaCO3.   -Which picture (2) -(4) represents the equilibrium mixture at a higher temperature? A) picture (2)  B) picture (3)  C) picture (4)  D) None of these" class="answers-bank-image d-inline" rel="preload" >
-Which picture (2) -(4) represents the equilibrium mixture at a higher temperature?

Accepted Answer

A)  picture (2) 
B)  picture (3) 
C)  picture (4) 
D)  None of these

Question 13

The reaction A2 + B2 ⇌ 2 AB has an equilibrium constant Kc = 1.8.The following pictures represent reaction mixtures that contain A2 molecules (shaded) and B2 molecules (unshaded) ,and AB molecules.Which reaction mixture is at equilibrium? 2 + B2 ⇌ 2 AB has an equilibrium constant Kc = 1.8.The following pictures represent reaction mixtures that contain A2 molecules (shaded) and B2 molecules (unshaded) ,and AB molecules.Which reaction mixture is at equilibrium?   A) reaction mixture (1)  B) reaction mixture (2)  C) reaction mixture (3)  D) reaction mixture (4) " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  reaction mixture (1) 
B)  reaction mixture (2) 
C)  reaction mixture (3) 
D)  reaction mixture (4)

Question 14

At a certain temperature,Kc equals 1.4 × 102 for the reaction: 2 CO(g) + O2(g) ⇌ 2 CO2(g) .
If a 2.50-L flask contains 0.400 mol of CO2 and 0.100 mol of O2 at equilibrium,how many moles of CO are also present in the flask?

Accepted Answer

A)  0.422 mol
B)  0.169 mol
C)  0.107 mol
D)  0.0114 mol

Question 15

The solubility of 1:1 salts is measured by the equilibrium constant for the general reaction: MX(s) = Mn+(aq) + Xn-(aq) .Given the following salts and their equilibrium constants for the reaction above at 25°C,which salt is the least soluble?

Accepted Answer

A)  MgCO3,Kc = 6.8 × 10-6
B)  CaCO3,Kc = 5.0 × 10-9
C)  SrCO3,Kc = 5.6 × 10-10
D)  BaCO3,Kc = 2.6 × 10-9

Question 16

A crude type of disappearing ink is based on the following endothermic equilibrium: [Co(H2O) 6]Cl2 (aq) ⇌ [CoCl2(H2O) 4] (aq) + 2 H2O (l) 
(colorless) (blue) 
If the reactant solution is used to write on a piece of paper and the paper is allowed to partially dry,what can be done to bring out the colored handwriting?

Accepted Answer

A)  add water
B)  decrease the volume
C)  put the paper in a freezer
D)  put the paper in an oven

Question 17

Shown below is a concentration vs.time plot for the reaction A ⇌ B.For this reaction the value of the equilibrium constant is c c = 0. C) Kc = 1. D) Kc > 1." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  Kc 
B)  Kc = 0.
C)  Kc = 1.
D)  Kc > 1.

Question 18

Shown below is a concentration vs.time plot for the reaction A ⇌ 2B.For this reaction the value of the equilibrium constant is c c = 0. C) Kc = 1. D) Kc > 1." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  Kc 
B)  Kc = 0.
C)  Kc = 1.
D)  Kc > 1.

Question 19

Which of the following will result in an increase in the amount of NH4Cl? NH4Cl (s) ⇌ NH3 (g) + HCl (g)

Accepted Answer

A)  increasing the volume
B)  decreasing the amount of HCl (g) 
C)  Iincreasing the amount of NH3 (g) 
D)  none of these

Question 20

What is the equilibrium equation for the reaction: NH4NO3(s) ⇌ N2O(g) + 2 H2O(g) ?

Accepted Answer

A)  Kp = [N2O]
B)  Kp = [N2O][H2O]
C)  Kp = [N2O][H2O]2
D)  Kp = 4NO3(s) ⇌ N2O(g) + 2 H2O(g) ? 
A)  Kp = [N2O] 
B)  Kp = [N2O][H2O] 
C)  Kp = [N2O][H2O]2 
D)  Kp =  " class="answers-bank-image d-inline" rel="preload" >

Exam 14: Chemical Equilibrium

A 1.50 L vessel contains an equilibrium mixture of 0.100 mol of NO,0.150 mol of Br₂,and 0.250 mol of NOBr at 25°C.What is the value of K_p for the reaction below? 2 NO(g) + Br₂(g) ⇌ 2 NOBr(g)

Correct Answer
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The reaction A₂ + B₂ ⇌ 2 AB has an equilibrium constant K_c = 1.8.The following pictures represent reaction mixtures that contain A₂ molecules (shaded) and B₂ molecules (unshaded) ,and AB molecules.Which reaction mixture is at equilibrium?

Correct Answer
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What is the equilibrium equation for the reaction: NH₄NO₃(s) ⇌ N₂O(g) + 2 H₂O(g) ?

Correct Answer
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Which of the following will result in an increase in the amount of NH₄Cl? NH₄Cl (s) ⇌ NH₃ (g) + HCl (g)

Correct Answer
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At a certain temperature,K_c equals 1.4 × 10² for the reaction: 2 CO(g) + O₂(g) ⇌ 2 CO₂(g) . If a 2.50-L flask contains 0.400 mol of CO₂ and 0.100 mol of O₂ at equilibrium,how many moles of CO are also present in the flask?

Correct Answer
verified

Picture (1) represents an equilibrium mixture of solid CaCO₃,solid CaO,and gaseous CO₂,obtained as a result of the endothermic decomposition of CaCO₃. -Which picture (2) -(4) represents the equilibrium mixture when more solid CaCO₃ is added?

Correct Answer
verified

Picture (1) represents an equilibrium mixture of solid CaCO₃,solid CaO,and gaseous CO₂,obtained as a result of the endothermic decomposition of CaCO₃. -Which picture (2) -(4) represents the equilibrium mixture when more solid CaO is added?

Correct Answer
verified

At 25°C,a certain first order reaction has a rate constant equal to 1.00 × 10^-3 s^-1 and an equilibrium constant,K_c,equal to 4.18.What is the rate constant for the reverse reaction?

Correct Answer
verified

Shown below is a concentration vs.time plot for the reaction A ⇌ 2B.For this reaction the value of the equilibrium constant is

Correct Answer
verified

For the reaction 2 A + B₂ ⇌ 2 AB,the rate of the forward reaction is 0.75 M/s and the rate of the reverse reaction is 0.25 M/s.The reaction is not at equilibrium.In order to attain equilibrium the reaction must proceed in the ________ (forward,reverse)direction in order to achieve equilibrium.

Correct Answer
verified

For a homogeneous equilibrium of gases,which of the following changes in reaction conditions will not alter the equilibrium concentrations?

Correct Answer
verified

Shown below is a concentration vs.time plot for the reaction A ⇌ B.For this reaction the value of the equilibrium constant is

Correct Answer
verified

The solubility of 1:1 salts is measured by the equilibrium constant for the general reaction: MX(s) = Mⁿ⁺(aq) + X^n-(aq) .Given the following salts and their equilibrium constants for the reaction above at 25°C,which salt is the least soluble?

Correct Answer
verified

Picture (1) represents an equilibrium mixture of solid CaCO₃,solid CaO,and gaseous CO₂,obtained as a result of the endothermic decomposition of CaCO₃. -Which picture (2) -(4) represents the equilibrium mixture at a higher temperature?

Correct Answer
verified

Correct Answer
verified

"If a stress is applied to a reaction mixture at equilibrium,the reaction occurs in the direction that will relieve the stress." This statement is called

Correct Answer
verified

Given the hypothetical reaction: 2 A(s) + x B(g) ⇌ 3 C(g) ,K_p = 0.0105 and K_c = 0.45 at 250°C.What is the value of the coefficient x?

Correct Answer
verified

Shown below is a concentration vs.time plot for the reaction A ⇌ B.For this reaction the value of the equilibrium constant is

Correct Answer
verified

The reaction CaCO₃(s)⇌ CaO(s)+ O₂(g)is endothermic 298 K.The effect of adding a catalyst to the system at equilibrium will ________ (decrease,increase,have no effect on)the total quantity of CaCO₃ once equilibrium is reestablished.

Correct Answer
verified

Find the equilibrium constant for the reaction: A(g) + B(g) ⇌ 2C(g) at 25°C when k equals 1.4 × 10^-12 M^-1s^-1 for the reaction A(g) + B(g) → 2C(g) at 25°C and k equals 2.7 × 10^-13 M^-1s^-1 for the reaction:

Correct Answer
verified

Exam 14: Chemical Equilibrium

A 1.50 L vessel contains an equilibrium mixture of 0.100 mol of NO,0.150 mol of Br2,and 0.250 mol of NOBr at 25°C.What is the value of Kp for the reaction below? 2 NO(g) + Br2(g) ⇌ 2 NOBr(g)

Correct AnswerverifiedShow Answer

The reaction A2 + B2 ⇌ 2 AB has an equilibrium constant Kc = 1.8.The following pictures represent reaction mixtures that contain A2 molecules (shaded) and B2 molecules (unshaded) ,and AB molecules.Which reaction mixture is at equilibrium?

Correct AnswerverifiedShow Answer

What is the equilibrium equation for the reaction: NH4NO3(s) ⇌ N2O(g) + 2 H2O(g) ?

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Which of the following will result in an increase in the amount of NH4Cl? NH4Cl (s) ⇌ NH3 (g) + HCl (g)

Correct AnswerverifiedShow Answer

At a certain temperature,Kc equals 1.4 × 102 for the reaction: 2 CO(g) + O2(g) ⇌ 2 CO2(g) . If a 2.50-L flask contains 0.400 mol of CO2 and 0.100 mol of O2 at equilibrium,how many moles of CO are also present in the flask?

Correct AnswerverifiedShow Answer

Picture (1) represents an equilibrium mixture of solid CaCO3,solid CaO,and gaseous CO2,obtained as a result of the endothermic decomposition of CaCO3. -Which picture (2) -(4) represents the equilibrium mixture when more solid CaCO3 is added?

Correct AnswerverifiedShow Answer

Picture (1) represents an equilibrium mixture of solid CaCO3,solid CaO,and gaseous CO2,obtained as a result of the endothermic decomposition of CaCO3. -Which picture (2) -(4) represents the equilibrium mixture when more solid CaO is added?

Correct AnswerverifiedShow Answer

At 25°C,a certain first order reaction has a rate constant equal to 1.00 × 10-3 s-1 and an equilibrium constant,Kc,equal to 4.18.What is the rate constant for the reverse reaction?

Correct AnswerverifiedShow Answer

Shown below is a concentration vs.time plot for the reaction A ⇌ 2B.For this reaction the value of the equilibrium constant is

Correct AnswerverifiedShow Answer

For the reaction 2 A + B2 ⇌ 2 AB,the rate of the forward reaction is 0.75 M/s and the rate of the reverse reaction is 0.25 M/s.The reaction is not at equilibrium.In order to attain equilibrium the reaction must proceed in the ________ (forward,reverse)direction in order to achieve equilibrium.

Correct AnswerverifiedShow Answer

For a homogeneous equilibrium of gases,which of the following changes in reaction conditions will not alter the equilibrium concentrations?

Correct AnswerverifiedShow Answer

Shown below is a concentration vs.time plot for the reaction A ⇌ B.For this reaction the value of the equilibrium constant is

Correct AnswerverifiedShow Answer

The solubility of 1:1 salts is measured by the equilibrium constant for the general reaction: MX(s) = Mn+(aq) + Xn-(aq) .Given the following salts and their equilibrium constants for the reaction above at 25°C,which salt is the least soluble?

Correct AnswerverifiedShow Answer

Picture (1) represents an equilibrium mixture of solid CaCO3,solid CaO,and gaseous CO2,obtained as a result of the endothermic decomposition of CaCO3. -Which picture (2) -(4) represents the equilibrium mixture at a higher temperature?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

"If a stress is applied to a reaction mixture at equilibrium,the reaction occurs in the direction that will relieve the stress." This statement is called

Correct AnswerverifiedShow Answer

Given the hypothetical reaction: 2 A(s) + x B(g) ⇌ 3 C(g) ,Kp = 0.0105 and Kc = 0.45 at 250°C.What is the value of the coefficient x?

Correct AnswerverifiedShow Answer

Shown below is a concentration vs.time plot for the reaction A ⇌ B.For this reaction the value of the equilibrium constant is

Correct AnswerverifiedShow Answer

The reaction CaCO3(s)⇌ CaO(s)+ O2(g)is endothermic 298 K.The effect of adding a catalyst to the system at equilibrium will ________ (decrease,increase,have no effect on)the total quantity of CaCO3 once equilibrium is reestablished.

Correct AnswerverifiedShow Answer

Find the equilibrium constant for the reaction: A(g) + B(g) ⇌ 2C(g) at 25°C when k equals 1.4 × 10-12 M-1s-1 for the reaction A(g) + B(g) → 2C(g) at 25°C and k equals 2.7 × 10-13 M-1s-1 for the reaction:

Correct AnswerverifiedShow Answer

A 1.50 L vessel contains an equilibrium mixture of 0.100 mol of NO,0.150 mol of Br₂,and 0.250 mol of NOBr at 25°C.What is the value of K_p for the reaction below? 2 NO(g) + Br₂(g) ⇌ 2 NOBr(g)

Correct Answer
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The reaction A₂ + B₂ ⇌ 2 AB has an equilibrium constant K_c = 1.8.The following pictures represent reaction mixtures that contain A₂ molecules (shaded) and B₂ molecules (unshaded) ,and AB molecules.Which reaction mixture is at equilibrium?

Correct Answer
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What is the equilibrium equation for the reaction: NH₄NO₃(s) ⇌ N₂O(g) + 2 H₂O(g) ?

Correct Answer
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Which of the following will result in an increase in the amount of NH₄Cl? NH₄Cl (s) ⇌ NH₃ (g) + HCl (g)

Correct Answer
verified

At a certain temperature,K_c equals 1.4 × 10² for the reaction: 2 CO(g) + O₂(g) ⇌ 2 CO₂(g) . If a 2.50-L flask contains 0.400 mol of CO₂ and 0.100 mol of O₂ at equilibrium,how many moles of CO are also present in the flask?

Correct Answer
verified

Picture (1) represents an equilibrium mixture of solid CaCO₃,solid CaO,and gaseous CO₂,obtained as a result of the endothermic decomposition of CaCO₃. -Which picture (2) -(4) represents the equilibrium mixture when more solid CaCO₃ is added?

Correct Answer
verified

Picture (1) represents an equilibrium mixture of solid CaCO₃,solid CaO,and gaseous CO₂,obtained as a result of the endothermic decomposition of CaCO₃. -Which picture (2) -(4) represents the equilibrium mixture when more solid CaO is added?

Correct Answer
verified

At 25°C,a certain first order reaction has a rate constant equal to 1.00 × 10^-3 s^-1 and an equilibrium constant,K_c,equal to 4.18.What is the rate constant for the reverse reaction?

Correct Answer
verified

Correct Answer
verified

For the reaction 2 A + B₂ ⇌ 2 AB,the rate of the forward reaction is 0.75 M/s and the rate of the reverse reaction is 0.25 M/s.The reaction is not at equilibrium.In order to attain equilibrium the reaction must proceed in the ________ (forward,reverse)direction in order to achieve equilibrium.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The solubility of 1:1 salts is measured by the equilibrium constant for the general reaction: MX(s) = Mⁿ⁺(aq) + X^n-(aq) .Given the following salts and their equilibrium constants for the reaction above at 25°C,which salt is the least soluble?

Correct Answer
verified

Picture (1) represents an equilibrium mixture of solid CaCO₃,solid CaO,and gaseous CO₂,obtained as a result of the endothermic decomposition of CaCO₃. -Which picture (2) -(4) represents the equilibrium mixture at a higher temperature?

Correct Answer
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Correct Answer
verified

Correct Answer
verified

Given the hypothetical reaction: 2 A(s) + x B(g) ⇌ 3 C(g) ,K_p = 0.0105 and K_c = 0.45 at 250°C.What is the value of the coefficient x?

Correct Answer
verified

Correct Answer
verified

The reaction CaCO₃(s)⇌ CaO(s)+ O₂(g)is endothermic 298 K.The effect of adding a catalyst to the system at equilibrium will ________ (decrease,increase,have no effect on)the total quantity of CaCO₃ once equilibrium is reestablished.

Correct Answer
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Find the equilibrium constant for the reaction: A(g) + B(g) ⇌ 2C(g) at 25°C when k equals 1.4 × 10^-12 M^-1s^-1 for the reaction A(g) + B(g) → 2C(g) at 25°C and k equals 2.7 × 10^-13 M^-1s^-1 for the reaction:

Correct Answer
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