Question 1

The following reaction is second order in A and first order in B: A + B → Products Rate = k[A]2[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. 2[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.   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) = 4:1" class="answers-bank-image d-inline" rel="preload" >

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 C)

Question 2

A mechanism for a naturally occurring reaction that destroys ozone is: Step 1: O3(g) + HO(g) → HO2(g) + O2(g) 
Step 2: HO2(g) + O(g) → HO(g) + O2(g) 
Which species is a catalyst?

Accepted Answer

A)  HO
B)  HO2
C)  O
D)  O3E) A) and B)
F) A) and C)

Question 3

Consider the first-order reaction A → B in which A molecules (shaded spheres) are converted to B molecules (unshaded spheres) . 
-Which drawing (a) -(d) represents the reaction mixture at t = 3 minutes?

Accepted Answer

A)  drawing (a) 
B)  drawing (b) 
C)  drawing (c) 
D)  drawing (d) E) A) and C)
F) A) and B)

Question 4

What is the overall reaction order for the reaction that has the rate law: Rate = k[Cl ]2[N2]?

Accepted Answer

A)  zero order
B)  first order
C)  second order
D)  third orderE) C) and D)
F) A) and B)

Question 5

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 2.80 mol/min at a particular moment,what is the rate of disappearance of N2O5 at that moment?

Accepted Answer

A)  0.700 mol/min
B)  1.40 mol/min
C)  5.60 mol/min
D)  11.2 mol/minE) A) and D)
F) B) and C)

Question 6

A concentration-time study of the gas phase reaction 2 A3 → 3 A2 produced the data in the table below. Time (s) [A3] (M) [A2] (M) 
0 4.00 × 10-4 0
10 2.00 × 10-4 3.00 × 10-4
20 1.00 × 10-4 4.50 × 10-4
30 5.00 × 10-5 ?
What is the concentration of A2 after 30 seconds?

Accepted Answer

A)  5.00 × 10-4 M
B)  5.25 × 10-4 M
C)  5.50 × 10-4 M
D)  6.00 × 10-4 ME) A) and B)
F) A) and C)

Question 7

For the zeroth-order reaction: A → products,what will happen to the rate of reaction if the concentration of A is tripled?

Accepted Answer

A)  The rate will be higher.
B)  The rate will be tripled.
C)  The rate will be one-third.
D)  The rate will remain the same.E) A) and B)
F) A) and C)

Question 8

Platinum in the catalytic converter of an automobile catalyzes the conversion of CO to CO2 is an example of a ________ (heterogeneous,homogeneous)catalyst.

Accepted Answer

Question 9

For the reaction shown below,if the rate of formation of O2 is 6.5 × 10-6 M/s,the rate of decomposition of N2O5 over the same time interval is ________.
2 N2O5(g)→ 4 NO2(g)+ O2(g)

Accepted Answer

Question 10

Hydrogen peroxide decomposes to water and oxygen according to the reaction below: 2 H2O2(aq) → 2 H2O(l) + O2(g) 
In the presence of large excesses of I- ion,the following set of data is obtained.What is the average rate of disappearance of H2O2(aq) in M/s in the first 45.0 seconds of the reaction if 1.00 L of H2O2 reacts at 25°C and 1.00 atm pressure? 2O2(aq) → 2 H2O(l) + O2(g)  In the presence of large excesses of I- ion,the following set of data is obtained.What is the average rate of disappearance of H2O2(aq) in M/s in the first 45.0 seconds of the reaction if 1.00 L of H2O2 reacts at 25°C and 1.00 atm pressure?   A) 9.09 × 10-7 M/s B) 3.63 × 10-6 M/s C) 4.33 × 10-5 M/s D) 1.64 × 10-4 M/s" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  9.09 × 10-7 M/s
B)  3.63 × 10-6 M/s
C)  4.33 × 10-5 M/s
D)  1.64 × 10-4 M/sE) C) and D)
F) None of the above

Question 11

Consider a reaction that occurs by the following one-step mechanism:
A2 + B2 → 2 AB
The potential energy profile for this reaction is shown below. 2 + B2 → 2 AB The potential energy profile for this reaction is shown below.   -The energy of reaction,ΔE,is given by the difference in energy between which two reaction stages? A) reaction stage 2 - reaction stage 1 B) reaction stage 2 - reaction stage 3 C) reaction stage 1 - reaction stage 3 D) reaction stage 3 - reaction stage 1" class="answers-bank-image d-inline" rel="preload" >
-The energy of reaction,ΔE,is given by the difference in energy between which two reaction stages?

Accepted Answer

A)  reaction stage 2 - reaction stage 1
B)  reaction stage 2 - reaction stage 3
C)  reaction stage 1 - reaction stage 3
D)  reaction stage 3 - reaction stage 1E) All of the above
F) B) and D)

Question 12

-What is the activation energy for the formation of ozone?

Accepted Answer

A)  14 kJ
B)  392 kJ
C)  406 kJ
D)  none of theseE) B) and C)
F) B) and D)

Question 13

Chlorine reacts with chloroform according to the reaction given below: Cl2 + CHCl3 → CCl4 + HCl
When the initial concentration of Cl2 is doubled the reaction rate increases by a factor of 1.41.What is the order of the reaction with respect to Cl2?

Accepted Answer

A)  -1/2
B)  -1
C)  1/2
D)  2E) A) and D)
F) B) and C)

Question 14

-What is the activation energy for the destruction of ozone?

Accepted Answer

A)  14 kJ
B)  392 kJ
C)  406 kJ
D)  none of theseE) A) and B)
F) A) and C)

Question 15

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

Accepted Answer

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

Question 16

For a particular first-order reaction,it takes 48 minutes for the concentration of the reactant to decrease to 25% of its initial value.What is the value for rate constant (in s-1) for the reaction?

Accepted Answer

A)  1.0 × 10-4 s-1
B)  4.8 × 10-4 s-1
C)  6.0 × 10-3 s-1
D)  2.9 × 10-2 s-1E) A) and C)
F) All of the above

Question 17

The reaction that occurs in a Breathalyzer,a device used to determine the alcohol level in a person's bloodstream,is given below.If the rate of appearance of Cr2(SO4) 3 is 1.24 mol/min at a particular moment,what is the rate of disappearance of C2H6O at that moment? 2 K2Cr2O7 + 8 H2SO4 + 3 C2H6O → 2 Cr2(SO4) 3 + 2 K2SO4 + 11 H2O

Accepted Answer

A)  0.413 mol/min
B)  0.826 mol/min
C)  1.86 mol/min
D)  3.72 mol/minE) A) and B)
F) A) and C)

Question 18

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 order of reaction with respect to A? A) 0 B) 1/2 C) 1 D) 2" class="answers-bank-image d-inline" rel="preload" >
-What is the order of reaction with respect to A?

Accepted Answer

A)  0
B)  1/2
C)  1
D)  2E) A) and D)
F) A) and C)

Question 19

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) C) and D)
F) A) and B)

Question 20

Consider the first-order decomposition of A molecules (shaded spheres) in two vessels of equal volume.What is the half-life of decomposition in vessel (b) relative to the half-life of decomposition in vessel (a) ?

Accepted Answer

A)  half-life in vessel (b) /half-life in vessel (a) = 4:1
B)  half-life in vessel (b) /half-life in vessel (a) = 2:1
C)  half-life in vessel (b) /half-life in vessel (a) = 3:2
D)  half-life in vessel (b) /half-life in vessel (a) = 1:1E) A) and D)
F) B) and C)

Exam 13: Chemical Kinetics

Platinum in the catalytic converter of an automobile catalyzes the conversion of CO to CO₂ is an example of a ________ (heterogeneous,homogeneous)catalyst.

Correct Answer
verified

For the zeroth-order reaction: A → products,what will happen to the rate of reaction if the concentration of A is tripled?

Correct Answer
verified

Consider the first-order decomposition of A molecules (shaded spheres) in two vessels of equal volume.What is the half-life of decomposition in vessel (b) relative to the half-life of decomposition in vessel (a) ?

Correct Answer
verified

For a particular first-order reaction,it takes 48 minutes for the concentration of the reactant to decrease to 25% of its initial value.What is the value for rate constant (in s^-1) for the reaction?

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 2.80 mol/min at a particular moment,what is the rate of disappearance of N₂O₅ at that moment?

Correct Answer
verified

Correct Answer
verified

A mechanism for a naturally occurring reaction that destroys ozone is: Step 1: O₃(g) + HO(g) → HO₂(g) + O₂(g) Step 2: HO₂(g) + O(g) → HO(g) + O₂(g) Which species is a catalyst?

Correct Answer
verified

-What is the activation energy for the destruction of ozone?

Correct Answer
verified

Correct Answer
verified

-What is the activation energy for the formation of ozone?

Correct Answer
verified

Consider the first-order reaction A → B in which A molecules (shaded spheres) are converted to B molecules (unshaded spheres) . -Which drawing (a) -(d) represents the reaction mixture at t = 3 minutes?

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 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

A concentration-time study of the gas phase reaction 2 A₃ → 3 A₂ produced the data in the table below. Time (s) [A₃] (M) [A₂] (M) 0 4.00 × 10^-4 0 10 2.00 × 10^-4 3.00 × 10^-4 20 1.00 × 10^-4 4.50 × 10^-4 30 5.00 × 10^-5 ? What is the concentration of A₂ after 30 seconds?

Correct Answer
verified

What is the overall reaction order for the reaction that has the rate law: Rate = k[Cl]²[N₂]^?

Correct Answer
verified

Consider a reaction that occurs by the following one-step mechanism: A₂ + B₂ → 2 AB The potential energy profile for this reaction is shown below. -The energy of reaction,ΔE,is given by the difference in energy between which two reaction stages?

Correct Answer
verified

Correct Answer
verified

For the reaction shown below,if the rate of formation of O₂ is 6.5 × 10^-6M/s,the rate of decomposition of N₂O₅ over the same time interval is ________. 2 N₂O₅(g)→ 4 NO₂(g)+ O₂(g)

Correct Answer
verified

Chlorine reacts with chloroform according to the reaction given below: Cl₂ + CHCl₃ → CCl₄ + HCl When the initial concentration of Cl₂ is doubled the reaction rate increases by a factor of 1.41.What is the order of the reaction with respect to Cl₂?

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 order of reaction with respect to A?

Correct Answer
verified

Exam 13: Chemical Kinetics

Platinum in the catalytic converter of an automobile catalyzes the conversion of CO to CO2 is an example of a ________ (heterogeneous,homogeneous)catalyst.

Correct AnswerverifiedShow Answer

For the zeroth-order reaction: A → products,what will happen to the rate of reaction if the concentration of A is tripled?

Correct AnswerverifiedShow Answer

Consider the first-order decomposition of A molecules (shaded spheres) in two vessels of equal volume.What is the half-life of decomposition in vessel (b) relative to the half-life of decomposition in vessel (a) ?

Correct AnswerverifiedShow Answer

For a particular first-order reaction,it takes 48 minutes for the concentration of the reactant to decrease to 25% of its initial value.What is the value for rate constant (in s-1) for the 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 O2 is equal to 2.80 mol/min at a particular moment,what is the rate of disappearance of N2O5 at that moment?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A mechanism for a naturally occurring reaction that destroys ozone is: Step 1: O3(g) + HO(g) → HO2(g) + O2(g) Step 2: HO2(g) + O(g) → HO(g) + O2(g) Which species is a catalyst?

Correct AnswerverifiedShow Answer

-What is the activation energy for the destruction of ozone?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

-What is the activation energy for the formation of ozone?

Correct AnswerverifiedShow Answer

Consider the first-order reaction A → B in which A molecules (shaded spheres) are converted to B molecules (unshaded spheres) . -Which drawing (a) -(d) represents the reaction mixture at t = 3 minutes?

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

A concentration-time study of the gas phase reaction 2 A3 → 3 A2 produced the data in the table below. Time (s) [A3] (M) [A2] (M) 0 4.00 × 10-4 0 10 2.00 × 10-4 3.00 × 10-4 20 1.00 × 10-4 4.50 × 10-4 30 5.00 × 10-5 ? What is the concentration of A2 after 30 seconds?

Correct AnswerverifiedShow Answer

What is the overall reaction order for the reaction that has the rate law: Rate = k[Cl ]2[N2]?

Correct AnswerverifiedShow Answer

Consider a reaction that occurs by the following one-step mechanism: A2 + B2 → 2 AB The potential energy profile for this reaction is shown below. -The energy of reaction,ΔE,is given by the difference in energy between which two reaction stages?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

For the reaction shown below,if the rate of formation of O2 is 6.5 × 10-6 M/s,the rate of decomposition of N2O5 over the same time interval is ________. 2 N2O5(g)→ 4 NO2(g)+ O2(g)

Correct AnswerverifiedShow Answer

Chlorine reacts with chloroform according to the reaction given below: Cl2 + CHCl3 → CCl4 + HCl When the initial concentration of Cl2 is doubled the reaction rate increases by a factor of 1.41.What is the order of the reaction with respect to Cl2?

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 order of reaction with respect to A?

Correct AnswerverifiedShow Answer

Platinum in the catalytic converter of an automobile catalyzes the conversion of CO to CO₂ is an example of a ________ (heterogeneous,homogeneous)catalyst.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

For a particular first-order reaction,it takes 48 minutes for the concentration of the reactant to decrease to 25% of its initial value.What is the value for rate constant (in s^-1) for the reaction?

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 2.80 mol/min at a particular moment,what is the rate of disappearance of N₂O₅ at that moment?

Correct Answer
verified

Correct Answer
verified

A mechanism for a naturally occurring reaction that destroys ozone is: Step 1: O₃(g) + HO(g) → HO₂(g) + O₂(g) Step 2: HO₂(g) + O(g) → HO(g) + O₂(g) Which species is a catalyst?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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 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

A concentration-time study of the gas phase reaction 2 A₃ → 3 A₂ produced the data in the table below. Time (s) [A₃] (M) [A₂] (M) 0 4.00 × 10^-4 0 10 2.00 × 10^-4 3.00 × 10^-4 20 1.00 × 10^-4 4.50 × 10^-4 30 5.00 × 10^-5 ? What is the concentration of A₂ after 30 seconds?

Correct Answer
verified

What is the overall reaction order for the reaction that has the rate law: Rate = k[Cl]²[N₂]^?

Correct Answer
verified

Consider a reaction that occurs by the following one-step mechanism: A₂ + B₂ → 2 AB The potential energy profile for this reaction is shown below. -The energy of reaction,ΔE,is given by the difference in energy between which two reaction stages?

Correct Answer
verified

Correct Answer
verified

For the reaction shown below,if the rate of formation of O₂ is 6.5 × 10^-6M/s,the rate of decomposition of N₂O₅ over the same time interval is ________. 2 N₂O₅(g)→ 4 NO₂(g)+ O₂(g)

Correct Answer
verified

Chlorine reacts with chloroform according to the reaction given below: Cl₂ + CHCl₃ → CCl₄ + HCl When the initial concentration of Cl₂ is doubled the reaction rate increases by a factor of 1.41.What is the order of the reaction with respect to Cl₂?

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 order of reaction with respect to A?

Correct Answer
verified