Question 1

Consider the hypothetical reaction A + 2 B 2 at equilibrium.Which is true? A) The reverse reaction rate is at a maximum B) The concentration of A must equal the concentration of B C) The concentration of A must equal one-half the concentration of B D) The forward reaction rate is equal to the reverse reaction rate E) The forward reaction rate is equal to the equilibrium reaction rate" class="answers-bank-image d-inline" rel="preload" > AB2 at equilibrium.Which is true?

Accepted Answer

A)  The reverse reaction rate is at a maximum
B)  The concentration of A must equal the concentration of B
C)  The concentration of A must equal one-half the concentration of B
D)  The forward reaction rate is equal to the reverse reaction rate
E)  The forward reaction rate is equal to the equilibrium reaction rateF) D) and E)
G) All of the above D

Question 2

Which of the following conditions is not found in a system that is at equilibrium?

Accepted Answer

A)  Reactants and products are being converted into one another continually
B)  The forward rate of reaction is equal to the rate of the reverse reaction
C)  The concentration of reactants is equal to the concentration of the products
D)  The system is closed and isolated from its surroundings
E)  The reaction can be represented by an equation with a double arrowF) B) and D)
G) A) and E)

Question 3

Which of the following correctly expresses Ka for the weak acid HF(aq) ?

Accepted Answer

A)  Ka = [HF]
B)  Ka = a for the weak acid HF(aq) ? 
A)  Ka = [HF] 
B)  Ka =   
C)  Ka =   
D)  Ka = [H+][F-] 
E)  Ka =  " class="answers-bank-image d-inline" rel="preload" >
C)  Ka = a for the weak acid HF(aq) ? 
A)  Ka = [HF] 
B)  Ka =   
C)  Ka =   
D)  Ka = [H+][F-] 
E)  Ka =  " class="answers-bank-image d-inline" rel="preload" >
D)  Ka = [H+][F-]
E)  Ka = a for the weak acid HF(aq) ? 
A)  Ka = [HF] 
B)  Ka =   
C)  Ka =   
D)  Ka = [H+][F-] 
E)  Ka =  " class="answers-bank-image d-inline" rel="preload" >F) None of the above
G) A) and B) B

Question 4

Consider the following reaction coordinate diagram.  Which numbered point represents the transition state of the reaction?

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  5F) B) and C)
G) D) and E)

Question 5

How does a catalyst alter the rate of a reaction?

Accepted Answer

A)  Catalysts replace part of the reactants
B)  Catalysts provide the activation energy needed
C)  A catalyst interferes with the attainment of chemical equilibrium
D)  Catalysts provide more heat to the reaction,and the increased temperature leads to an increased reaction rate
E)  Catalysts provide a reaction pathway with a lower energy of activationF) A) and B)
G) B) and E)

Question 6

Which of the following is the best description of the activation energy for the forward reaction for the reaction A2 + B2 2 + B2   2 AB? A) The difference between the energy of the activated complex and the reactant energies B) The difference between the product energies and the energy of the activated complex C) The difference between the product energies and the reactant energies D) The sum of the energy of the activated complex and the reactant energies E) The sum of the energy of the activated complex and the product energies" class="answers-bank-image d-inline" rel="preload" > 2 AB?

Accepted Answer

A)  The difference between the energy of the activated complex and the reactant energies
B)  The difference between the product energies and the energy of the activated complex
C)  The difference between the product energies and the reactant energies
D)  The sum of the energy of the activated complex and the reactant energies
E)  The sum of the energy of the activated complex and the product energiesF) B) and D)
G) A) and B)

Question 7

What will happen if the temperature is increased after equilibrium has been established in the reaction shown? 2 Cl2(g) + 2 H2O(g) + 113 kJ 2(g) + 2 H2O(g) + 113 kJ   4 HCl(g) + O2(g)  A) The position of equilibrium shifts to the left B) More HCl will form C) More Cl2 will form D) The partial pressure of oxygen will decrease E) The concentration of H2O will increase" class="answers-bank-image d-inline" rel="preload" > 4 HCl(g) + O2(g)

Accepted Answer

A)  The position of equilibrium shifts to the left
B)  More HCl will form
C)  More Cl2 will form
D)  The partial pressure of oxygen will decrease
E)  The concentration of H2O will increaseF) A) and D)
G) A) and E)

Question 8

Which of the following statements does not correctly describe the character of a chemical equilibrium?

Accepted Answer

A)  As a system comes to equilibrium,the chemical reactions come to a stop
B)  In a liquid-gas equilibrium,the number of moles of the gas does not necessarily equal the number of moles of the liquid
C)  In a solution equilibrium,the number of moles of the solvent does not necessarily equal the number of moles of the liquid
D)  All of the statements above correctly describe a chemical equilibrium
E)  None of the statements above correctly describes a chemical equilibriumF) All of the above
G) D) and E)

Question 9

Consider the following reaction coordinate diagram.  Based on this diagram,which of the following is correct?

Accepted Answer

A)  2 represents  Δ\DeltaΔ E and the reaction is exothermic.
B)  2 represents  Δ\DeltaΔ E and the reaction is endothermic
C)  3 represents  Δ\DeltaΔ E and the reaction is endothermic
D)  3 represents  Δ\DeltaΔ E and the reaction is exothermic
E)  5 represents  Δ\DeltaΔ E and the reaction is exothermic F) A) and E)
G) A) and D)

Question 10

If the position of equilibrium shifts to the left,what will happen?

Accepted Answer

A)  The concentration of products will increase
B)  The concentration of reactants will increase
C)  The temperature will rise
D)  The temperature will decrease
E)  The concentrations of both products and reactants will increaseF) A) and B)
G) A) and C)

Question 11

What will happen to the position of equilibrium if the volume of the system is decreased in the reaction shown? N2(g) + 3 H2 2(g) + 3 H2   2 NH3(g)  A) It will shift to the left B) There will be no shift in the position of equilibrium C) The position will shift left and then return to its original place D) It will shift to the right E) It will shift so that the system volume is increased again" class="answers-bank-image d-inline" rel="preload" > 2 NH3(g)

Accepted Answer

A)  It will shift to the left
B)  There will be no shift in the position of equilibrium
C)  The position will shift left and then return to its original place
D)  It will shift to the right
E)  It will shift so that the system volume is increased againF) A) and C)
G) All of the above D

Question 12

What will happen if the temperature is decreased after equilibrium has been established in the reaction below? 2 C2H6(g) + 7 O2(g)  2H6(g) + 7 O2(g)    4 CO2(g) + 6 H2O(g) + 2855 kJ A) There will be no change in the system B) The concentration of ethane will increase C) The partial pressure of oxygen will increase D) The number of water molecules will decrease E) More carbon dioxide will form" class="answers-bank-image d-inline" rel="preload" > 4 CO2(g) + 6 H2O(g) + 2855 kJ

Accepted Answer

A)  There will be no change in the system
B)  The concentration of ethane will increase
C)  The partial pressure of oxygen will increase
D)  The number of water molecules will decrease
E)  More carbon dioxide will formF) All of the above
G) A) and E)

Question 13

Choose the correct equilibrium constant expression for the equilibrium CO(g) + Cl2(g)  2(g)    COCl2(g) . A) K =   B) K =   C) K =   D) K =   E) K =  " class="answers-bank-image d-inline" rel="preload" > COCl2(g) .

Accepted Answer

A)  K = 2(g)    COCl2(g) . 
A)  K =   
B)  K =   
C)  K =   
D)  K =   
E)  K =  " class="answers-bank-image d-inline" rel="preload" >
B)  K = 2(g)    COCl2(g) . 
A)  K =   
B)  K =   
C)  K =   
D)  K =   
E)  K =  " class="answers-bank-image d-inline" rel="preload" >
C)  K = 2(g)    COCl2(g) . 
A)  K =   
B)  K =   
C)  K =   
D)  K =   
E)  K =  " class="answers-bank-image d-inline" rel="preload" >
D)  K = 2(g)    COCl2(g) . 
A)  K =   
B)  K =   
C)  K =   
D)  K =   
E)  K =  " class="answers-bank-image d-inline" rel="preload" >
E)  K = 2(g)    COCl2(g) . 
A)  K =   
B)  K =   
C)  K =   
D)  K =   
E)  K =  " class="answers-bank-image d-inline" rel="preload" >F) B) and D)
G) B) and E)

Question 14

What kind of molecular collisions will not lead to the formation of product in a reaction?

Accepted Answer

A)  Only those without sufficient kinetic energy
B)  Only those with the wrong orientation,regardless of the kinetic energy
C)  Collisions between molecules that have more energy than the minimum required
D)  Those without sufficient kinetic energy and with the wrong orientation
E)  Those with effective collisionsF) A) and D)
G) B) and D)

Question 15

Which of the following statements is/are incorrect?
(i) Undissolved sugar in contact with a saturated sugar solution in an open beaker cannot reach equilibrium
(ii) A liquid and its vapor enclosed in two one-liter containers connected by an open glass tube cannot reach equilibrium
(iii) A solution of a weak acid,hydronium ion,and the conjugate base of the weak acid cannot reach equilibrium

Accepted Answer

A)  i only
B)  ii only
C)  i and ii
D)  ii and iii
E)  i,ii,and iiiF) All of the above
G) B) and C)

Question 16

Which of the following is the primary reason for a higher reaction rate at higher temperatures?

Accepted Answer

A)  Molecules move faster at higher temperatures,producing more violent collisions
B)  Electrons occupy higher principal energy levels and are therefore more reactive
C)  There is a larger fraction of molecules with sufficient energy to react
D)  Molecules increase in size with increasing temperature,providing more surface area for potential collisions
E)  The higher temperature creates a lower activation energy,so more molecules can pass over the potential energy barrierF) B) and E)
G) A) and C)

Question 17

Which of the following statements is/are correct?
(i) The forward reaction in an equilibrium reaction is exactly the reverse of the reverse reaction
(ii) A dynamic equilibrium is established when two molecules collide
(iii) As reactant concentrations in a chemical equilibrium reaction decrease,the forward reaction rate declines

Accepted Answer

A)  ii only
B)  i and ii
C)  i and iii
D)  ii and iii
E)  i,ii,and iiiF) A) and B)
G) D) and E)

Question 18

Which of the following statements is/are correct?
(i) If an equilibrium constant is very large,the reverse reaction is favored
(ii) If an equilibrium constant is very small,the forward reaction is favored
(iii) If an equilibrium constant is neither large nor small,appreciable quantities of all species are present at equilibrium

Accepted Answer

A)  iii only
B)  i and ii
C)  ii and iii
D)  All statements are incorrect
E)  All statements are correctF) A) and B)
G) C) and D)

Question 19

Consider the particulate level representation of a reaction of the form:  
Based on just this diagram,which of the following does not correctly describes this reaction?

Accepted Answer

A)  The collision was ineffective.
B)  Product did not form.
C)  The orientation of the reactants to with respect to each other was wrong.
D)  The molecules had too much potential energy.
E)  All of the above do describe this reaction.F) B) and D)
G) None of the above

Question 20

If a copper(II) nitrate solution is added to a sodium sulfide solution the following equilibrium will be attained: Cu2+(aq) + S2-(aq)  2+(aq) + S2-(aq)    CuS(s) .For this equilibrium,K = 6.3*1047.Choose the correct equilibrium constant expression and the correct direction favored at equilibrium. A) K =   forward B) K =   reverse C) K =   forward D) K =   reverse E) K =   appreciable quantities of all species are present at equilibrium" class="answers-bank-image d-inline" rel="preload" > CuS(s) .For this equilibrium,K = 6.3*1047.Choose the correct equilibrium constant expression and the correct direction favored at equilibrium.

Accepted Answer

A)  K = 2+(aq) + S2-(aq)    CuS(s) .For this equilibrium,K = 6.3*1047.Choose the correct equilibrium constant expression and the correct direction favored at equilibrium. 
A)  K =   forward 
B)  K =   reverse 
C)  K =   forward 
D)  K =   reverse 
E)  K =   appreciable quantities of all species are present at equilibrium" class="answers-bank-image d-inline" rel="preload" > forward
B)  K = 2+(aq) + S2-(aq)    CuS(s) .For this equilibrium,K = 6.3*1047.Choose the correct equilibrium constant expression and the correct direction favored at equilibrium. 
A)  K =   forward 
B)  K =   reverse 
C)  K =   forward 
D)  K =   reverse 
E)  K =   appreciable quantities of all species are present at equilibrium" class="answers-bank-image d-inline" rel="preload" > reverse
C)  K = 2+(aq) + S2-(aq)    CuS(s) .For this equilibrium,K = 6.3*1047.Choose the correct equilibrium constant expression and the correct direction favored at equilibrium. 
A)  K =   forward 
B)  K =   reverse 
C)  K =   forward 
D)  K =   reverse 
E)  K =   appreciable quantities of all species are present at equilibrium" class="answers-bank-image d-inline" rel="preload" > forward
D)  K = 2+(aq) + S2-(aq)    CuS(s) .For this equilibrium,K = 6.3*1047.Choose the correct equilibrium constant expression and the correct direction favored at equilibrium. 
A)  K =   forward 
B)  K =   reverse 
C)  K =   forward 
D)  K =   reverse 
E)  K =   appreciable quantities of all species are present at equilibrium" class="answers-bank-image d-inline" rel="preload" > reverse
E)  K = 2+(aq) + S2-(aq)    CuS(s) .For this equilibrium,K = 6.3*1047.Choose the correct equilibrium constant expression and the correct direction favored at equilibrium. 
A)  K =   forward 
B)  K =   reverse 
C)  K =   forward 
D)  K =   reverse 
E)  K =   appreciable quantities of all species are present at equilibrium" class="answers-bank-image d-inline" rel="preload" > appreciable quantities of all species are present at equilibriumF) B) and C)
G) C) and D)

Exam 18: Chemical Equilibrium

Consider the hypothetical reaction A + 2 B AB₂ at equilibrium.Which is true?

Correct Answer
verified
D

Which of the following conditions is not found in a system that is at equilibrium?

Correct Answer
verified

Which of the following correctly expresses K_a for the weak acid HF(aq) ?

Correct Answer
verified
B

Consider the following reaction coordinate diagram. Which numbered point represents the transition state of the reaction?

Correct Answer
verified

How does a catalyst alter the rate of a reaction?

Correct Answer
verified

Which of the following is the best description of the activation energy for the forward reaction for the reaction A₂ + B₂ 2 AB?

Correct Answer
verified

What will happen if the temperature is increased after equilibrium has been established in the reaction shown? 2 Cl₂(g) + 2 H₂O(g) + 113 kJ 4 HCl(g) + O₂(g)

Correct Answer
verified

Which of the following statements does not correctly describe the character of a chemical equilibrium?

Correct Answer
verified

Correct Answer
verified

If the position of equilibrium shifts to the left,what will happen?

Correct Answer
verified

What will happen to the position of equilibrium if the volume of the system is decreased in the reaction shown? N₂(g) + 3 H₂ 2 NH₃(g)

Correct Answer
verified
D

What will happen if the temperature is decreased after equilibrium has been established in the reaction below? 2 C₂H₆(g) + 7 O₂(g) 4 CO₂(g) + 6 H₂O(g) + 2855 kJ

Correct Answer
verified

Choose the correct equilibrium constant expression for the equilibrium CO(g) + Cl₂(g) COCl₂(g) .

Correct Answer
verified

What kind of molecular collisions will not lead to the formation of product in a reaction?

Correct Answer
verified

Correct Answer
verified

Which of the following is the primary reason for a higher reaction rate at higher temperatures?

Correct Answer
verified

Correct Answer
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Correct Answer
verified

Consider the particulate level representation of a reaction of the form: Based on just this diagram,which of the following does not correctly describes this reaction?

Correct Answer
verified

If a copper(II) nitrate solution is added to a sodium sulfide solution the following equilibrium will be attained: Cu²⁺(aq) + S²^-(aq) CuS(s) .For this equilibrium,K = 6.3*10⁴⁷.Choose the correct equilibrium constant expression and the correct direction favored at equilibrium.

Correct Answer
verified

Exam 18: Chemical Equilibrium

Consider the hypothetical reaction A + 2 B AB2 at equilibrium.Which is true?

Correct AnswerverifiedD

Which of the following conditions is not found in a system that is at equilibrium?

Correct AnswerverifiedShow Answer

Which of the following correctly expresses Ka for the weak acid HF(aq) ?

Correct AnswerverifiedB

Consider the following reaction coordinate diagram. Which numbered point represents the transition state of the reaction?

Correct AnswerverifiedShow Answer

How does a catalyst alter the rate of a reaction?

Correct AnswerverifiedShow Answer

Which of the following is the best description of the activation energy for the forward reaction for the reaction A2 + B2 2 AB?

Correct AnswerverifiedShow Answer

What will happen if the temperature is increased after equilibrium has been established in the reaction shown? 2 Cl2(g) + 2 H2O(g) + 113 kJ 4 HCl(g) + O2(g)

Correct AnswerverifiedShow Answer

Which of the following statements does not correctly describe the character of a chemical equilibrium?

Correct AnswerverifiedShow Answer

Consider the following reaction coordinate diagram. Based on this diagram,which of the following is correct?

Correct AnswerverifiedShow Answer

If the position of equilibrium shifts to the left,what will happen?

Correct AnswerverifiedShow Answer

What will happen to the position of equilibrium if the volume of the system is decreased in the reaction shown? N2(g) + 3 H2 2 NH3(g)

Correct AnswerverifiedD

What will happen if the temperature is decreased after equilibrium has been established in the reaction below? 2 C2H6(g) + 7 O2(g) 4 CO2(g) + 6 H2O(g) + 2855 kJ

Correct AnswerverifiedShow Answer

Choose the correct equilibrium constant expression for the equilibrium CO(g) + Cl2(g) COCl2(g) .

Correct AnswerverifiedShow Answer

What kind of molecular collisions will not lead to the formation of product in a reaction?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which of the following is the primary reason for a higher reaction rate at higher temperatures?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Consider the particulate level representation of a reaction of the form: Based on just this diagram,which of the following does not correctly describes this reaction?

Correct AnswerverifiedShow Answer

If a copper(II) nitrate solution is added to a sodium sulfide solution the following equilibrium will be attained: Cu2+(aq) + S2-(aq) CuS(s) .For this equilibrium,K = 6.3*1047.Choose the correct equilibrium constant expression and the correct direction favored at equilibrium.

Correct AnswerverifiedShow Answer

Consider the hypothetical reaction A + 2 B AB₂ at equilibrium.Which is true?

Correct Answer
verified
D

Correct Answer
verified

Which of the following correctly expresses K_a for the weak acid HF(aq) ?

Correct Answer
verified
B

Correct Answer
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Correct Answer
verified

Which of the following is the best description of the activation energy for the forward reaction for the reaction A₂ + B₂ 2 AB?

Correct Answer
verified

What will happen if the temperature is increased after equilibrium has been established in the reaction shown? 2 Cl₂(g) + 2 H₂O(g) + 113 kJ 4 HCl(g) + O₂(g)

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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What will happen to the position of equilibrium if the volume of the system is decreased in the reaction shown? N₂(g) + 3 H₂ 2 NH₃(g)

Correct Answer
verified
D

What will happen if the temperature is decreased after equilibrium has been established in the reaction below? 2 C₂H₆(g) + 7 O₂(g) 4 CO₂(g) + 6 H₂O(g) + 2855 kJ

Correct Answer
verified

Choose the correct equilibrium constant expression for the equilibrium CO(g) + Cl₂(g) COCl₂(g) .

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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If a copper(II) nitrate solution is added to a sodium sulfide solution the following equilibrium will be attained: Cu²⁺(aq) + S²^-(aq) CuS(s) .For this equilibrium,K = 6.3*10⁴⁷.Choose the correct equilibrium constant expression and the correct direction favored at equilibrium.

Correct Answer
verified