Question 1

Which equilibrium constant represents a reaction that is reactant favored?

Accepted Answer

A)  Keq = 0.025
B)  Keq = 5.2
C)  Keq = 8.4 x 10-5 
D)  Keq = 6.3 x 105 
E)  not enough information C

Question 2

In a chemical reaction at constant temperature, the addition of a catalyst

Accepted Answer

A)  affects the equilibrium constant.
B)  increases the average kinetic energy of the reactants.
C)  provides an alternate reaction pathway with a different activation energy.
D)  decreases the energy released in the chemical reaction.
E)  increases the concentration of the products at equilibrium. C

Question 3

When square brackets are placed around the formula for a substance in an equilibrium constant expression, it indicates the percent-by-mass concentration of that substance.For example [NaOH] means the percent-by-mass concentration of NaOH.

Accepted Answer

A) True 
 B)False

Question 4

If heat is added to the system of an endothermic reaction, the equilibrium will shift to make more reactants.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following statements regarding catalysts is incorrect?

Accepted Answer

A)  A catalyst increases the rate of a reaction by giving the reaction an alternate pathway with lower activation energy.
B)  A catalyst is formed temporarily in an early step of a reaction.
C)  Most enzyme catalysts are large protein molecules.
D)  In a chemical equation the catalyst is shown above the reaction arrow of the equation.
E)  The shape of an active site on an enzyme is unique, allowing it to react with only one substrate.

Question 6

Which equilibrium constant represents a reaction that is product favored?

Accepted Answer

A)  Keq = 0.025
B)  Keq = 5.2
C)  Keq = 8.4 x 10-5 
D)  Keq = 6.3 x 105 
E)  not enough information

Question 7

The rate of a reaction can be increased by all of the following except

Accepted Answer

A)  increasing the temperature.
B)  increasing the concentration of the reactants.
C)  increasing the surface area of the reactants.
D)  adding a catalyst.
E)  increasing the volume of the reaction vessel.

Question 8

Consider the following reaction carried out in a sealed container: N2(g)  + 3H2(g)  ⇌ 2NH3(g)  A state of equilibrium can be reached if the container initially contains

Accepted Answer

A)  NH3 only.
B)  N2 and H2 only.
C)  NH3 and N2 only.
D)  NH3, N2, and H2.
E)  any of these combinations of reactants and product.

Question 9

In order to write the equilibrium constant expression for a reaction, you must:

Accepted Answer

A)  know the mechanism for the reaction.
B)  know the rate of the forward and reverse reactions.
C)  know the concentrations of all reactants and products.
D)  have the balanced chemical equation for the reaction.
E)  know the conditions of pressure, temperature, and concentration for the system. D

Question 10

Identify any intermediates or catalysts in the following two-step reaction: Cu2+ + H2  →\rightarrow→ CuH+ + H+ CuH+ + H+ + H2C=CH2  →\rightarrow→  Cu2+ + H3C-CH3

Accepted Answer

A)  CuH+ is an intermediate.
B)  Cu2+ is a catalyst, H+ is an intermediate.
C)  Cu2+ is a catalyst,  CuH+ is an intermediate.
D)  Cu2+ is a catalyst,  CuH+ and H+ are intermediates.
E)  CuH+ and H+ are catalysts, Cu2+ is an intermediate.

Question 11

Given that the following reaction is exothermic, which of the following sets of changes would cause the following system at equilibrium to shift to increase the number of N2O4(g)  molecules? 2NO2(g)  ⇌N2O4(g)  What observation would indicate that the reaction is at equilibrium in a closed container?

Accepted Answer

A)  Increasing container volume and increasing temperature
B)  Increasing container volume and decreasing temperature
C)  Decreasing container volume and increasing temperature
D)  Decreasing container volume and decreasing temperature
E)  Changing volume or temperature will not affect the number of gas molecules present at equilibrium

Question 12

Identify an intermediate in the following two-step reaction.Sn2+ + Fe3+  →\rightarrow→   Sn3+ + Fe2+ Sn3+ + Fe3+ →\rightarrow→    Sn4+ + Fe2+

Accepted Answer

A)  Sn2+ 
B)  Fe3+ 
C)  Sn3+ 
D)  Fe2+ 
E)  Sn4+

Question 13

Identify any intermediates or catalysts in the following two-step reaction: H2O2 + 2Br- + 2H+ →\rightarrow→ 2H2O + Br2 H2O2 + Br2  →\rightarrow→ 2H+ + O2 + 2Br-

Accepted Answer

A)  H2O2 is an intermediate.
B)  H2O2 is a catalyst, Br- is an intermediate.
C)  Br- is a catalyst, Br2 is an intermediate.
D)  H+ is a catalyst.
E)  Br- and H+ are catalysts, Br2 is an intermediate.

Question 14

Identify the catalyst in the following three-step process for the decomposition of ozone.O3(g)  ⇌ O2(g)  + O(g)  NO(g)  + O3(g)   →\rightarrow→   NO2(g)  + O2(g)  O(g)  + NO2(g)   →\rightarrow→   O2(g)  + NO(g)

Accepted Answer

A)  O(g) 
B)  O3(g) 
C)  O2(g) 
D)  NO(g) 
E)  NO2(g)

Question 15

Which of the following statements regarding catalysts is incorrect?

Accepted Answer

A)  A catalyst increases the rate of a reaction by giving the reaction an alternate pathway with a lower activation energy.
B)  Catalysts need not be present in large amounts because they are regenerated during the reaction.
C)  Enzymes act as catalysts in our bodies.
D)  In a chemical reaction, the catalyst is shown on the reactant side of the equation.
E)  The shape of an active site on an enzyme is unique, allowing it to react with only one substrate.

Question 16

A reaction that has a high activation energy will have a high rate of reaction.

Accepted Answer

A) True 
 B)False

Question 17

Consider the reaction CO(g)  + H2O(g)  CO2(g)  + H2(g) , represented by the following diagram: 2O(g)  CO2(g)  + H2(g) , represented by the following diagram:   What is the composition of this system when the reaction reaches equilibrium? A) 3 CO, 3 H2O, 7 CO2, 7 H2  B) 1 CO, 1 H2O, 4 CO2, 4 H2  C) 2 CO, 2 H2O, 8 CO2, 8 H2  D) 8 CO, 8 H2O, 2 CO2, 2 H2  E) 4 CO, 6 H2O, 4 CO2, 6 H2 " class="answers-bank-image d-inline" rel="preload" > What is the composition of this system when the reaction reaches equilibrium?

Accepted Answer

A)  3 CO, 3 H2O, 7 CO2, 7 H2 
B)  1 CO, 1 H2O, 4 CO2, 4 H2 
C)  2 CO, 2 H2O, 8 CO2, 8 H2 
D)  8 CO, 8 H2O, 2 CO2, 2 H2 
E)  4 CO, 6 H2O, 4 CO2, 6 H2

Question 18

Identify any intermediates or catalysts in the following two-step reaction: S2O82- + I-  →\rightarrow→   2SO42- + I+ I+ + I- →\rightarrow→    I2

Accepted Answer

A)  S2O82- is an intermediate.
B)  S2O82- is a catalyst.
C)  I- is a catalyst.
D)  I+ is an intermediate.
E)  SO42- is a catalyst.

Question 19

A catalyst gives an alternate pathway for a reaction that has a lower activation energy.

Accepted Answer

A) True 
 B)False

Question 20

The reaction CaCO3(s)  CaO(s) + CO2(g) is an example of a heterogeneous equilibrium.

Accepted Answer

A) True 
 B)False

Exam 12: Reaction Rates and Chemical Equilibrium

Which equilibrium constant represents a reaction that is reactant favored?

Correct Answer
verified
C

In a chemical reaction at constant temperature, the addition of a catalyst

Correct Answer
verified
C

When square brackets are placed around the formula for a substance in an equilibrium constant expression, it indicates the percent-by-mass concentration of that substance.For example [NaOH] means the percent-by-mass concentration of NaOH.

Correct Answer
verified

If heat is added to the system of an endothermic reaction, the equilibrium will shift to make more reactants.

Correct Answer
verified

Which of the following statements regarding catalysts is incorrect?

Correct Answer
verified

Which equilibrium constant represents a reaction that is product favored?

Correct Answer
verified

The rate of a reaction can be increased by all of the following except

Correct Answer
verified

Consider the following reaction carried out in a sealed container: N₂(g) + 3H₂(g) ⇌ 2NH₃(g) A state of equilibrium can be reached if the container initially contains

Correct Answer
verified

In order to write the equilibrium constant expression for a reaction, you must:

Correct Answer
verified
D

Identify any intermediates or catalysts in the following two-step reaction: Cu²⁺ + H₂ $\rightarrow$ CuH⁺ + H⁺CuH⁺ + H⁺+H₂C=CH₂ $\rightarrow$ Cu²⁺+H₃C-CH₃

Correct Answer
verified

Correct Answer
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Identify an intermediate in the following two-step reaction.Sn²⁺ + Fe³⁺ $\rightarrow$ Sn³⁺ + Fe²⁺Sn³⁺ + Fe³⁺ $\rightarrow$ Sn⁴⁺ + Fe²⁺

Correct Answer
verified

Identify any intermediates or catalysts in the following two-step reaction: H₂O₂+ 2Br^- + 2H⁺ $\rightarrow$ 2H₂O + Br₂H₂O₂ + Br₂ $\rightarrow$ 2H⁺ + O₂+ 2Br^-

Correct Answer
verified

Identify the catalyst in the following three-step process for the decomposition of ozone.O₃(g) ⇌ O₂(g) + O(g) NO(g) + O₃(g) $\rightarrow$ NO₂(g) + O₂(g) O(g) + NO₂(g) $\rightarrow$ O₂(g) + NO(g)

Correct Answer
verified

Which of the following statements regarding catalysts is incorrect?

Correct Answer
verified

A reaction that has a high activation energy will have a high rate of reaction.

Correct Answer
verified

Consider the reaction CO(g) + H₂O(g) CO₂(g) + H₂(g) , represented by the following diagram: What is the composition of this system when the reaction reaches equilibrium?

Correct Answer
verified

Identify any intermediates or catalysts in the following two-step reaction: S₂O₈^2- + I^- $\rightarrow$ 2SO₄^2- + I⁺I⁺+ I^- $\rightarrow$ I₂

Correct Answer
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A catalyst gives an alternate pathway for a reaction that has a lower activation energy.

Correct Answer
verified

The reaction CaCO₃(s) CaO(s) + CO₂(g) is an example of a heterogeneous equilibrium.

Correct Answer
verified

Exam 12: Reaction Rates and Chemical Equilibrium

Which equilibrium constant represents a reaction that is reactant favored?

Correct AnswerverifiedC

In a chemical reaction at constant temperature, the addition of a catalyst

Correct AnswerverifiedC

When square brackets are placed around the formula for a substance in an equilibrium constant expression, it indicates the percent-by-mass concentration of that substance.For example [NaOH] means the percent-by-mass concentration of NaOH.

Correct AnswerverifiedShow Answer

If heat is added to the system of an endothermic reaction, the equilibrium will shift to make more reactants.

Correct AnswerverifiedShow Answer

Which of the following statements regarding catalysts is incorrect?

Correct AnswerverifiedShow Answer

Which equilibrium constant represents a reaction that is product favored?

Correct AnswerverifiedShow Answer

The rate of a reaction can be increased by all of the following except

Correct AnswerverifiedShow Answer

Consider the following reaction carried out in a sealed container: N2(g) + 3H2(g) ⇌ 2NH3(g) A state of equilibrium can be reached if the container initially contains

Correct AnswerverifiedShow Answer

In order to write the equilibrium constant expression for a reaction, you must:

Correct AnswerverifiedD

Identify any intermediates or catalysts in the following two-step reaction: Cu2+ + H2 →\rightarrow→ CuH+ + H+ CuH+ + H+ + H2C=CH2 →\rightarrow→ Cu2+ + H3C-CH3

Correct AnswerverifiedShow Answer

Given that the following reaction is exothermic, which of the following sets of changes would cause the following system at equilibrium to shift to increase the number of N2O4(g) molecules? 2NO2(g) ⇌N2O4(g) What observation would indicate that the reaction is at equilibrium in a closed container?

Correct AnswerverifiedShow Answer

Identify an intermediate in the following two-step reaction.Sn2+ + Fe3+ →\rightarrow→ Sn3+ + Fe2+ Sn3+ + Fe3+ →\rightarrow→ Sn4+ + Fe2+

Correct AnswerverifiedShow Answer

Identify any intermediates or catalysts in the following two-step reaction: H2O2 + 2Br- + 2H+ →\rightarrow→ 2H2O + Br2 H2O2 + Br2 →\rightarrow→ 2H+ + O2 + 2Br-

Correct AnswerverifiedShow Answer

Identify the catalyst in the following three-step process for the decomposition of ozone.O3(g) ⇌ O2(g) + O(g) NO(g) + O3(g) →\rightarrow→ NO2(g) + O2(g) O(g) + NO2(g) →\rightarrow→ O2(g) + NO(g)

Correct AnswerverifiedShow Answer

Which of the following statements regarding catalysts is incorrect?

Correct AnswerverifiedShow Answer

A reaction that has a high activation energy will have a high rate of reaction.

Correct AnswerverifiedShow Answer

Consider the reaction CO(g) + H2O(g) CO2(g) + H2(g) , represented by the following diagram: What is the composition of this system when the reaction reaches equilibrium?

Correct AnswerverifiedShow Answer

Identify any intermediates or catalysts in the following two-step reaction: S2O82- + I- →\rightarrow→ 2SO42- + I+ I+ + I- →\rightarrow→ I2

Correct AnswerverifiedShow Answer

A catalyst gives an alternate pathway for a reaction that has a lower activation energy.

Correct AnswerverifiedShow Answer

The reaction CaCO3(s) CaO(s) + CO2(g) is an example of a heterogeneous equilibrium.

Correct AnswerverifiedShow Answer

Correct Answer
verified
C

Correct Answer
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C

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
verified

Consider the following reaction carried out in a sealed container: N₂(g) + 3H₂(g) ⇌ 2NH₃(g) A state of equilibrium can be reached if the container initially contains

Correct Answer
verified

Correct Answer
verified
D

Identify any intermediates or catalysts in the following two-step reaction: Cu²⁺ + H₂ $\rightarrow$ CuH⁺ + H⁺CuH⁺ + H⁺+H₂C=CH₂ $\rightarrow$ Cu²⁺+H₃C-CH₃

Correct Answer
verified

Correct Answer
verified

Identify an intermediate in the following two-step reaction.Sn²⁺ + Fe³⁺ $\rightarrow$ Sn³⁺ + Fe²⁺Sn³⁺ + Fe³⁺ $\rightarrow$ Sn⁴⁺ + Fe²⁺

Correct Answer
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Identify any intermediates or catalysts in the following two-step reaction: H₂O₂+ 2Br^- + 2H⁺ $\rightarrow$ 2H₂O + Br₂H₂O₂ + Br₂ $\rightarrow$ 2H⁺ + O₂+ 2Br^-

Correct Answer
verified

Identify the catalyst in the following three-step process for the decomposition of ozone.O₃(g) ⇌ O₂(g) + O(g) NO(g) + O₃(g) $\rightarrow$ NO₂(g) + O₂(g) O(g) + NO₂(g) $\rightarrow$ O₂(g) + NO(g)

Correct Answer
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Correct Answer
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Correct Answer
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Consider the reaction CO(g) + H₂O(g) CO₂(g) + H₂(g) , represented by the following diagram: What is the composition of this system when the reaction reaches equilibrium?

Correct Answer
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Identify any intermediates or catalysts in the following two-step reaction: S₂O₈^2- + I^- $\rightarrow$ 2SO₄^2- + I⁺I⁺+ I^- $\rightarrow$ I₂

Correct Answer
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Correct Answer
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The reaction CaCO₃(s) CaO(s) + CO₂(g) is an example of a heterogeneous equilibrium.

Correct Answer
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