Question 1

The decomposition of dinitrogen pentoxide is described by the chemical equation
2 N2O5(g) → 4 NO2(g) + O2(g) 
If the rate of appearance of NO2 is equal to 0.560 mol/min at a particular moment,what is the rate of appearance of O2 at that moment?

Accepted Answer

A)  0) 140 mol/min
B)  0) 280 mol/min
C)  1) 12 mol/min
D)  2) 24 mol/minE) A) and B)
F) B) and D)

Question 2

Consider a bimolecular reaction in the gas phase.Which one of the following changes in condition will not cause an increase in the rate of the reaction?

Accepted Answer

A)  add a catalyst
B)  increase the temperature at constant volume
C)  increase the volume at constant temperature
D)  All of these will increase the rate of reaction.E) A) and D)
F) All of the above

Question 3

The following set of data was obtained by the method of initial rates for the reaction:
(H3C) 3CBr + OH- → (H3C) 3COH + Br-
What is the order of reaction with respect to ion,OH-? 3C) 3CBr + OH- → (H3C) 3COH + Br- What is the order of reaction with respect to ion,OH-?   A) zero B) first C) second D) none of these" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  zero
B)  first
C)  second
D)  none of theseE) A) and C)
F) B) and C)

Question 4

"Instantaneous rate" is defined as the

Accepted Answer

A)  change in concentration per unit time.
B)  equation showing how the rate depends on the concentration of each reactant.
C)  rate of reaction at a particular time.
D)  rate of reaction during a time interval.E) A) and D)
F) A) and C)

Question 5

The aquation of tris(1,10-phenanthroline) iron(II) in acid solution takes place according to the equation:
Fe(phen) 32+ + 3 H3O+ + 3 H2O → Fe(H2O) 62+ + 3 phenH+.
If the activation energy,Ea,is 126 kJ/mol and the rate constant at 30°C is 9.8 × 10-3 min-1,what is the rate constant at 50°C?

Accepted Answer

A)  4) 4 × 10-4 min-1
B)  2) 2 × 10-1 min-1
C)  4) 6 × 100 min-1
D)  2) 3 × 103 min-1E) None of the above
F) A) and B)

Question 6

What percentage of a radioactive substance remains after 6.00 half-lives have elapsed?

Accepted Answer

A)  0) 78%
B)  1) 56%
C)  3) 31%
D)  6) 25%E) C) and D)
F) B) and D)

Question 7

The following pictures represent the progress of a reaction in which two A molecules combine to give a more complex molecule A2,2A → A2. 2,2A → A2.   -What is the time required to achieve the molecular mixture in drawing (d) ? A) 4 min B) 5 min C) 7 min D) 8 min" class="answers-bank-image d-inline" rel="preload" >
-What is the time required to achieve the molecular mixture in drawing (d) ?

Accepted Answer

A)  4 min
B)  5 min
C)  7 min
D)  8 minE) None of the above
F) A) and D)

Question 8

-Which of the elementary reactions shown above has a molecularity of one?

Accepted Answer

A)  elementary reaction (a) 
B)  elementary reaction (b) 
C)  elementary reaction (c) 
D)  elementary reactions (a) ,(b) ,and (c) E) None of the above
F) A) and D)

Question 9

The decomposition of dinitrogen pentoxide is described by the chemical equation
2 N2O5(g) → 4 NO2(g) + O2(g) 
If the rate of appearance of O2 is equal to 2.40 mol/min at a particular moment,what is the rate of disappearance of N2O5 at that moment?

Accepted Answer

A)  0) 600 mol/min
B)  1) 20 mol/min
C)  4) 80 mol/min
D)  9) 60 mol/minE) A) and B)
F) A) and C)

Question 10

Which general rate law below corresponds to an elementary bimolecular reaction?

Accepted Answer

A)  Rate = k[A]
B)  Rate = k[A][B][C]
C)  Rate = k[A]2[B]
D)  Rate = k[A][B]E) None of the above
F) B) and D)

Question 11

What is the rate law for the elementary reaction shown below?
2 HI → H2 + I2

Accepted Answer

A)  Rate = k[HI]
B)  Rate = k[HI]2
C)  Rate = k[H2][I2]
D)  Rate = k[H2][I2]/[HI]2E) None of the above
F) A) and B)

Question 12

The decomposition of hydrogen peroxide is given by the following reaction:
2 H2O2(aq) → 2 H2O(l) + O2(g) 
In the presence of KI the reaction is thought to occur by the following mechanism:
Step 1: H2O2 + I- → H2O + IO-
Step 2: IO- + H2O2 → H2O + O2 + I-
What is the role of I- in this mechanism?

Accepted Answer

A)  catalyst
B)  frequency factor
C)  intermediate
D)  transition stateE) A) and B)
F) B) and C)

Question 13

The first-order reaction,2 N2O(g) → 2 N2(g) + O2(g) ,has a rate constant equal to 0.76 s-1 at
1000 K.How long will it take for the concentration of N2O to decrease to 12% of its initial concentration?

Accepted Answer

A)  0) 62 s
B)  2) 8 s
C)  6) 3 s
D)  8) 4 sE) A) and B)
F) A) and C)

Question 14

Which part of the Arrhenius equation contains a term which measures the number of molecules that have the correct orientation for reaction?

Accepted Answer

A)  activation energy
B)  e-Ea/RT
C)  frequency factor
D)  none of theseE) B) and C)
F) A) and C)

Question 15

The reaction shown below has the rate law: Rate = k[BrO3-][Br-][H+]2.
BrO3-(aq) + 5 Br-(aq) + 6 H+(aq) → 3 Br2(aq) + 3 H2O(l) 
What is the overall order of reaction?

Accepted Answer

A)  first
B)  second
C)  third
D)  fourthE) C) and D)
F) All of the above

Question 16

The following set of data was obtained by the method of initial rates for the reaction:
BrO3-(aq) + 5 Br-(aq) + 6 H+(aq) → 3 Br2(aq) + 3 H2O(l) .
Calculate the initial rate when BrO3- is 0.30 M,Br- is 0.050 M,and H+ is 0.15 M. 3-(aq) + 5 Br-(aq) + 6 H+(aq) → 3 Br2(aq) + 3 H2O(l) . Calculate the initial rate when BrO3- is 0.30 M,Br- is 0.050 M,and H+ is 0.15 M.   A) 6) 1 × 10-5 M/s B) 2) 7 × 10-3 M/s C) 5) 3 × 10-2 M/s D) 8) 4 × 10-2 M/s" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  6) 1 × 10-5 M/s
B)  2) 7 × 10-3 M/s
C)  5) 3 × 10-2 M/s
D)  8) 4 × 10-2 M/sE) A) and B)
F) All of the above

Question 17

Decays by alpha emission to give 
) If unshaded spheres represent 
Atoms and shaded spheres represent 
Atoms,how many half-lives have passed in the following example?

Accepted Answer

A)  1 half-life
B)  2 half-lives
C)  3 half-lives
D)  4 half-livesE) A) and D)
F) All of the above

Question 18

The following reaction is first order in A and first order in B:
A + B → Products Rate = k[A][B]
What is the initial rate of this reaction in vessel (b) relative to the initial rate of this reaction in vessel (a) ? Each vessel has the same volume.Shaded spheres represent A molecules,and unshaded spheres represent B molecules present at the beginning of the reaction.

Accepted Answer

A)  rate in vessel (b) /rate in vessel (a) = 1:2
B)  rate in vessel (b) /rate in vessel (a) = 1:1
C)  rate in vessel (b) /rate in vessel (a) = 2:1
D)  rate in vessel (b) /rate in vessel (a) = 4:1E) B) and C)
F) A) and B)

Question 19

A reaction with an activation energy,Ea = 103 kJ/mol has a rate constant,k = 3.5 × 10-5 s-1 at 25°C.For this reaction the rate constant at 45°C is ________.

Accepted Answer

Question 20

The following set of data was obtained by the method of initial rates for the reaction:
BrO3-(aq) + 5 Br-(aq) + 6 H+(aq) → 3 Br2(aq) + 3 H2O(l) .
What is the rate law for the reaction? 3-(aq) + 5 Br-(aq) + 6 H+(aq) → 3 Br2(aq) + 3 H2O(l) . What is the rate law for the reaction?   A) Rate = k[BrO3-][Br-][H+]4 B) Rate = k[BrO3-][Br-][H+]-4 C) Rate = k[BrO3-][Br-][H+]-2 D) Rate = k[BrO3-][Br-][H+]2" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  Rate = k[BrO3-][Br-][H+]4
B)  Rate = k[BrO3-][Br-][H+]-4
C)  Rate = k[BrO3-][Br-][H+]-2
D)  Rate = k[BrO3-][Br-][H+]2E) A) and B)
F) B) and C)

Exam 12: Chemical Kinetics

Which general rate law below corresponds to an elementary bimolecular reaction?

Correct Answer
verified

The following set of data was obtained by the method of initial rates for the reaction: (H₃C) ₃CBr + OH^- → (H₃C) ₃COH + Br^- What is the order of reaction with respect to ion,OH^-?

Correct Answer
verified

Consider a bimolecular reaction in the gas phase.Which one of the following changes in condition will not cause an increase in the rate of the reaction?

Correct Answer
verified

Which part of the Arrhenius equation contains a term which measures the number of molecules that have the correct orientation for reaction?

Correct Answer
verified

The reaction shown below has the rate law: Rate = k[BrO₃^-][Br^-][H⁺]². BrO₃^-(aq) + 5 Br^-(aq) + 6 H⁺(aq) → 3 Br₂(aq) + 3 H₂O(l) What is the overall order of reaction?

Correct Answer
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The decomposition of dinitrogen pentoxide is described by the chemical equation 2 N₂O₅(g) → 4 NO₂(g) + O₂(g) If the rate of appearance of NO₂ is equal to 0.560 mol/min at a particular moment,what is the rate of appearance of O₂at that moment?

Correct Answer
verified

Correct Answer
verified

The decomposition of dinitrogen pentoxide is described by the chemical equation 2 N₂O₅(g) → 4 NO₂(g) + O₂(g) If the rate of appearance of O₂ is equal to 2.40 mol/min at a particular moment,what is the rate of disappearance of N₂O₅ at that moment?

Correct Answer
verified

Decays by alpha emission to give ) If unshaded spheres represent Atoms and shaded spheres represent Atoms,how many half-lives have passed in the following example?

Correct Answer
verified

The following set of data was obtained by the method of initial rates for the reaction: BrO₃^-(aq) + 5 Br^-(aq) + 6 H⁺(aq) → 3 Br₂(aq) + 3 H₂O(l) . Calculate the initial rate when BrO₃^- is 0.30 M,Br^- is 0.050 M,and H⁺ is 0.15 M.

Correct Answer
verified

The following set of data was obtained by the method of initial rates for the reaction: BrO₃^-(aq) + 5 Br^-(aq) + 6 H⁺(aq) → 3 Br₂(aq) + 3 H₂O(l) . What is the rate law for the reaction?

Correct Answer
verified

Correct Answer
verified

What is the rate law for the elementary reaction shown below? 2 HI → H₂ + I₂

Correct Answer
verified

What percentage of a radioactive substance remains after 6.00 half-lives have elapsed?

Correct Answer
verified

"Instantaneous rate" is defined as the

Correct Answer
verified

The following pictures represent the progress of a reaction in which two A molecules combine to give a more complex molecule A₂,2A → A₂. -What is the time required to achieve the molecular mixture in drawing (d) ?

Correct Answer
verified

The first-order reaction,2 N₂O(g) → 2 N₂(g) + O₂(g) ,has a rate constant equal to 0.76 s^-1 at 1000 K.How long will it take for the concentration of N₂O to decrease to 12% of its initial concentration?

Correct Answer
verified

-Which of the elementary reactions shown above has a molecularity of one?

Correct Answer
verified

Correct Answer
verified

A reaction with an activation energy,E_a = 103 kJ/mol has a rate constant,k = 3.5 × 10^-5 s^-1 at 25°C.For this reaction the rate constant at 45°C is ________.

Correct Answer
verified

Exam 12: Chemical Kinetics

Which general rate law below corresponds to an elementary bimolecular reaction?

Correct AnswerverifiedShow Answer

The following set of data was obtained by the method of initial rates for the reaction: (H3C) 3CBr + OH- → (H3C) 3COH + Br- What is the order of reaction with respect to ion,OH-?

Correct AnswerverifiedShow Answer

Consider a bimolecular reaction in the gas phase.Which one of the following changes in condition will not cause an increase in the rate of the reaction?

Correct AnswerverifiedShow Answer

Which part of the Arrhenius equation contains a term which measures the number of molecules that have the correct orientation for reaction?

Correct AnswerverifiedShow Answer

The reaction shown below has the rate law: Rate = k[BrO3-][Br-][H+]2. BrO3-(aq) + 5 Br-(aq) + 6 H+(aq) → 3 Br2(aq) + 3 H2O(l) What is the overall order of reaction?

Correct AnswerverifiedShow Answer

The decomposition of dinitrogen pentoxide is described by the chemical equation 2 N2O5(g) → 4 NO2(g) + O2(g) If the rate of appearance of NO2 is equal to 0.560 mol/min at a particular moment,what is the rate of appearance of O2 at that moment?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The decomposition of dinitrogen pentoxide is described by the chemical equation 2 N2O5(g) → 4 NO2(g) + O2(g) If the rate of appearance of O2 is equal to 2.40 mol/min at a particular moment,what is the rate of disappearance of N2O5 at that moment?

Correct AnswerverifiedShow Answer

Decays by alpha emission to give ) If unshaded spheres represent Atoms and shaded spheres represent Atoms,how many half-lives have passed in the following example?

Correct AnswerverifiedShow Answer

The following set of data was obtained by the method of initial rates for the reaction: BrO3-(aq) + 5 Br-(aq) + 6 H+(aq) → 3 Br2(aq) + 3 H2O(l) . Calculate the initial rate when BrO3- is 0.30 M,Br- is 0.050 M,and H+ is 0.15 M.

Correct AnswerverifiedShow Answer

The following set of data was obtained by the method of initial rates for the reaction: BrO3-(aq) + 5 Br-(aq) + 6 H+(aq) → 3 Br2(aq) + 3 H2O(l) . What is the rate law for the reaction?

Correct AnswerverifiedShow Answer

The aquation of tris(1,10-phenanthroline) iron(II) in acid solution takes place according to the equation: Fe(phen) 32+ + 3 H3O+ + 3 H2O → Fe(H2O) 62+ + 3 phenH+. If the activation energy,Ea,is 126 kJ/mol and the rate constant at 30°C is 9.8 × 10-3 min-1,what is the rate constant at 50°C?

Correct AnswerverifiedShow Answer

What is the rate law for the elementary reaction shown below? 2 HI → H2 + I2

Correct AnswerverifiedShow Answer

What percentage of a radioactive substance remains after 6.00 half-lives have elapsed?

Correct AnswerverifiedShow Answer

"Instantaneous rate" is defined as the

Correct AnswerverifiedShow Answer

The following pictures represent the progress of a reaction in which two A molecules combine to give a more complex molecule A2,2A → A2. -What is the time required to achieve the molecular mixture in drawing (d) ?

Correct AnswerverifiedShow Answer

The first-order reaction,2 N2O(g) → 2 N2(g) + O2(g) ,has a rate constant equal to 0.76 s-1 at 1000 K.How long will it take for the concentration of N2O to decrease to 12% of its initial concentration?

Correct AnswerverifiedShow Answer

-Which of the elementary reactions shown above has a molecularity of one?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A reaction with an activation energy,Ea = 103 kJ/mol has a rate constant,k = 3.5 × 10-5 s-1 at 25°C.For this reaction the rate constant at 45°C is ________.

Correct AnswerverifiedShow Answer

Correct Answer
verified

The following set of data was obtained by the method of initial rates for the reaction: (H₃C) ₃CBr + OH^- → (H₃C) ₃COH + Br^- What is the order of reaction with respect to ion,OH^-?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The reaction shown below has the rate law: Rate = k[BrO₃^-][Br^-][H⁺]². BrO₃^-(aq) + 5 Br^-(aq) + 6 H⁺(aq) → 3 Br₂(aq) + 3 H₂O(l) What is the overall order of reaction?

Correct Answer
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The decomposition of dinitrogen pentoxide is described by the chemical equation 2 N₂O₅(g) → 4 NO₂(g) + O₂(g) If the rate of appearance of NO₂ is equal to 0.560 mol/min at a particular moment,what is the rate of appearance of O₂at that moment?

Correct Answer
verified

Correct Answer
verified

The decomposition of dinitrogen pentoxide is described by the chemical equation 2 N₂O₅(g) → 4 NO₂(g) + O₂(g) If the rate of appearance of O₂ is equal to 2.40 mol/min at a particular moment,what is the rate of disappearance of N₂O₅ at that moment?

Correct Answer
verified

Correct Answer
verified

The following set of data was obtained by the method of initial rates for the reaction: BrO₃^-(aq) + 5 Br^-(aq) + 6 H⁺(aq) → 3 Br₂(aq) + 3 H₂O(l) . Calculate the initial rate when BrO₃^- is 0.30 M,Br^- is 0.050 M,and H⁺ is 0.15 M.

Correct Answer
verified

The following set of data was obtained by the method of initial rates for the reaction: BrO₃^-(aq) + 5 Br^-(aq) + 6 H⁺(aq) → 3 Br₂(aq) + 3 H₂O(l) . What is the rate law for the reaction?

Correct Answer
verified

Correct Answer
verified

What is the rate law for the elementary reaction shown below? 2 HI → H₂ + I₂

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The following pictures represent the progress of a reaction in which two A molecules combine to give a more complex molecule A₂,2A → A₂. -What is the time required to achieve the molecular mixture in drawing (d) ?

Correct Answer
verified

The first-order reaction,2 N₂O(g) → 2 N₂(g) + O₂(g) ,has a rate constant equal to 0.76 s^-1 at 1000 K.How long will it take for the concentration of N₂O to decrease to 12% of its initial concentration?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A reaction with an activation energy,E_a = 103 kJ/mol has a rate constant,k = 3.5 × 10^-5 s^-1 at 25°C.For this reaction the rate constant at 45°C is ________.

Correct Answer
verified