Question 1

Consider the first-order decomposition of A molecules (shaded spheres) in two vessels of equal volume.How will the half-life of decomposition in vessel (a) be affected if the volume of the vessel is decreased by a factor of 2?

Accepted Answer

A)  decrease by 1/2
B)  increase by 2
C)  increase by 4
D)  stay the sameE) B) and C)
F) None of the above

Question 2

At an elevated temperature the decomposition of a gaseous oxide,AO2 occurs with a rate constant,
k = 0.54 M-1s-1.If the half-life of this reaction is 926 seconds when [AO2] = 2.0 × 10-3 M and 462 seconds when [AO2] = 4.0 × 10-3 M,this reaction is ________ order.

Accepted Answer

Question 3

The reaction: 2 HI → H2 + I2,is second order and the rate constant at 800 K is 9.70 × 10-2 M-1 s-1.How long will it take for 8.00 × 10-2 mol/L of HI to decrease to one-fourth of its initial concentration?

Accepted Answer

A)  0) 619 s
B)  124 s
C)  387 s
D)  429 sE) C) and D)
F) B) and D)

Question 4

For a reaction that follows the general rate law,Rate = k[A][B]2,what will happen to the rate of reaction if the concentration of B is increased by a factor of 3.00? The rate will

Accepted Answer

A)  decrease by a factor of 1/ 9.00.
B)  decrease by a factor of 1/ 3.00.
C)  increase by a factor of 3.00.
D)  increase by a factor of 9.00.E) A) and B)
F) A) and C)

Question 5

The reaction between chlorine and nitric oxide to form nitrosyl chloride is shown below.If the reaction rate doubles when the concentration of Cl2 is doubled and the rate quadruples when the concentration of NO is doubled,by what factor will the rate increase if both concentrations,NO and Cl2,are doubled?
Cl2(g) + 2 NO(g) → 2 NOCl(g)

Accepted Answer

A)  2
B)  4
C)  8
D)  16E) B) and D)
F) B) and C)

Question 6

For the first-order reaction,2 N2O(g) → 2 N2(g) + O2(g) ,what is the concentration of N2O after 3 half-lives if 0.15 mol of N2O is initially placed into in a 1.00-L reaction vessel?

Accepted Answer

A)  9) 4 × 10-3 M
B)  1) 9 × 10-2 M
C)  3) 8 × 10-2 M
D)  7) 5 × 10-2 ME) C) and D)
F) B) and D)

Question 7

Which statement is true for the general rate law: Rate = k[A]m[B]n?

Accepted Answer

A)  It can be written from the stoichiometry of the overall reaction.
B)  The overall order of the reaction is equal to m times n.
C)  The values for the exponents must be determined by experiment.
D)  The exponents in the rate law must be positive integers.E) A) and D)
F) B) and C)

Question 8

What fraction of collisions will have sufficient energy to react for a gas whose activation energy is 68 kJ/mol at 25°C?

Accepted Answer

A)  1) 2 × 10-12
B)  2) 7 × 10-2
C)  0) 96
D)  8) 3 × 1011E) A) and C)
F) A) and B)

Question 9

Hydroquinone,HOC6H6OH,can be formed by the reaction with acetylene below:
2 HCCH + 3 CO + H2O → HOC6H4OH + CO2
How is the rate of disappearance of acetylene,HCCH,related to the appearance of hydroquinone (Hq) ? 6H6OH,can be formed by the reaction with acetylene below: 2 HCCH + 3 CO + H2O → HOC6H4OH + CO2 How is the rate of disappearance of acetylene,HCCH,related to the appearance of hydroquinone (Hq) ?   = ? A)    B)    C)    D)   " class="answers-bank-image d-inline" rel="preload" >
= ?

Accepted Answer

A)   6H6OH,can be formed by the reaction with acetylene below: 2 HCCH + 3 CO + H2O → HOC6H4OH + CO2 How is the rate of disappearance of acetylene,HCCH,related to the appearance of hydroquinone (Hq) ?   = ? 
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >
B)   6H6OH,can be formed by the reaction with acetylene below: 2 HCCH + 3 CO + H2O → HOC6H4OH + CO2 How is the rate of disappearance of acetylene,HCCH,related to the appearance of hydroquinone (Hq) ?   = ? 
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >
C)   6H6OH,can be formed by the reaction with acetylene below: 2 HCCH + 3 CO + H2O → HOC6H4OH + CO2 How is the rate of disappearance of acetylene,HCCH,related to the appearance of hydroquinone (Hq) ?   = ? 
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >
D)   6H6OH,can be formed by the reaction with acetylene below: 2 HCCH + 3 CO + H2O → HOC6H4OH + CO2 How is the rate of disappearance of acetylene,HCCH,related to the appearance of hydroquinone (Hq) ?   = ? 
A)     
B)     
C)     
D)    " class="answers-bank-image d-inline" rel="preload" >E) C) and D)
F) None of the above

Question 10

Decays by beta 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) All of the above
F) A) and B)

Question 11

The isomerization reaction,CH3NC → CH3CN,is first order and the rate constant is equal to
0) 46 s-1 at 600 K.What is the concentration of CH3NC after 0.20 minutes if the initial concentration is 0.30 M?

Accepted Answer

A)  1) 2 × 10- 3 M
B)  2) 7 × 10- 3 M
C)  1) 2 × 10- 1 M
D)  2) 7 × 10- 1 ME) A) and B)
F) A) and C)

Question 12

For a particular first-order reaction,it takes 24 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)  2) 0 × 10- 4 s-1
B)  9) 6 × 10- 4 s-1
C)  1) 2 × 10- 2 s-1
D)  5) 8 × 10- 2 s-1E) B) and D)
F) A) and C)

Question 13

The decomposition of ozone in the stratosphere can occur by the following two-step mechanism:
Step 1: Br + O3 → BrO + O2
Step 2: BrO + O → Br + O2
Which species is an intermediate in this mechanism?

Accepted Answer

A)  Br
B)  BrO
C)  O
D)  O3E) A) and B)
F) All of the above

Question 14

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 42% of its initial concentration?

Accepted Answer

A)  0) 88 s
B)  1) 1 s
C)  1) 8 s
D)  2) 4 sE) A) and D)
F) B) and C)

Question 15

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 activation energy for the forward reaction 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 activation energy for the forward reaction 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) A) and B)
F) A) and C)

Question 16

Which of the following figures represents the decay of 
By positron emission to give 
After three half-lives has passed? Unshaded spheres represent 
Atoms and shaded spheres represent 
Atoms.

Accepted Answer

A)  figure (1) 
B)  figure (2) 
C)  figure (3) 
D)  figure (4) E) A) and B)
F) A) and C)

Question 17

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 C)
F) B) and C)

Question 18

The decomposition of hydrogen peroxide occurs according to the equation
2 H2O2(aq)→ 2 H2O(l)+ O2(g)
A concentration-time study of this reaction produces a straight line when ln[H2O2] is plotted versus time.Therefore,this is a ________ order reaction.

Accepted Answer

Question 19

Which term describes the measure of the increase in the concentration of a product per unit time?

Accepted Answer

A)  activation energy
B)  kinetics
C)  reaction rate
D)  reaction timeE) B) and D)
F) None of the above

Question 20

Which of the following does not affect the rate of a bimolecular reaction?

Accepted Answer

A)  concentrations of reactants
B)  presence of a catalyst
C)  temperature
D)  All of these affect the rate.E) B) and D)
F) B) and C)

Exam 12: Chemical Kinetics

Decays by beta 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 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 42% of its initial concentration?

Correct Answer
verified

For a reaction that follows the general rate law,Rate = k[A][B]²,what will happen to the rate of reaction if the concentration of B is increased by a factor of 3.00? The rate will

Correct Answer
verified

Which statement is true for the general rate law: Rate = k[A]^m[B]ⁿ?

Correct Answer
verified

Consider the first-order decomposition of A molecules (shaded spheres) in two vessels of equal volume.How will the half-life of decomposition in vessel (a) be affected if the volume of the vessel is decreased by a factor of 2?

Correct Answer
verified

Which term describes the measure of the increase in the concentration of a product per unit time?

Correct Answer
verified

Which of the following figures represents the decay of By positron emission to give After three half-lives has passed? Unshaded spheres represent Atoms and shaded spheres represent Atoms.

Correct Answer
verified

For the first-order reaction,2 N₂O(g) → 2 N₂(g) + O₂(g) ,what is the concentration of N₂O after 3 half-lives if 0.15 mol of N₂O is initially placed into in a 1.00-L reaction vessel?

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 decomposition of ozone in the stratosphere can occur by the following two-step mechanism: Step 1: Br + O₃ → BrO + O₂ Step 2: BrO + O → Br + O₂ Which species is an intermediate in this mechanism?

Correct Answer
verified

The decomposition of hydrogen peroxide occurs according to the equation 2 H₂O₂(aq)→ 2 H₂O(l)+ O₂(g) A concentration-time study of this reaction produces a straight line when ln[H₂O₂] is plotted versus time.Therefore,this is a ________ order reaction.

Correct Answer
verified

What fraction of collisions will have sufficient energy to react for a gas whose activation energy is 68 kJ/mol at 25°C?

Correct Answer
verified

Hydroquinone,HOC₆H₆OH,can be formed by the reaction with acetylene below: 2 HCCH + 3 CO + H₂O → HOC₆H₄OH + CO₂ How is the rate of disappearance of acetylene,HCCH,related to the appearance of hydroquinone (Hq) ? = ?

Correct Answer
verified

The isomerization reaction,CH₃NC → CH₃CN,is first order and the rate constant is equal to 0) 46 s^-1 at 600 K.What is the concentration of CH₃NC after 0.20 minutes if the initial concentration is 0.30 M?

Correct Answer
verified

Which of the following does not affect the rate of a bimolecular reaction?

Correct Answer
verified

For a particular first-order reaction,it takes 24 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 reaction: 2 HI → H₂ + I₂,is second order and the rate constant at 800 K is 9.70 × 10^-2 M^-1 s^-1.How long will it take for 8.00 × 10^-2 mol/L of HI to decrease to one-fourth of its initial concentration?

Correct Answer
verified

At an elevated temperature the decomposition of a gaseous oxide,AO₂ occurs with a rate constant, k = 0.54 M^-1s^-1.If the half-life of this reaction is 926 seconds when [AO₂] = 2.0 × 10^-3 M and 462 seconds when [AO₂] = 4.0 × 10^-3 M,this reaction is ________ order.

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 activation energy for the forward reaction is given by the difference in energy between which two reaction stages?

Correct Answer
verified

Correct Answer
verified

Exam 12: Chemical Kinetics

Decays by beta 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 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 42% of its initial concentration?

Correct AnswerverifiedShow Answer

For a reaction that follows the general rate law,Rate = k[A][B]2,what will happen to the rate of reaction if the concentration of B is increased by a factor of 3.00? The rate will

Correct AnswerverifiedShow Answer

Which statement is true for the general rate law: Rate = k[A]m[B]n?

Correct AnswerverifiedShow Answer

Consider the first-order decomposition of A molecules (shaded spheres) in two vessels of equal volume.How will the half-life of decomposition in vessel (a) be affected if the volume of the vessel is decreased by a factor of 2?

Correct AnswerverifiedShow Answer

Which term describes the measure of the increase in the concentration of a product per unit time?

Correct AnswerverifiedShow Answer

Which of the following figures represents the decay of By positron emission to give After three half-lives has passed? Unshaded spheres represent Atoms and shaded spheres represent Atoms.

Correct AnswerverifiedShow Answer

For the first-order reaction,2 N2O(g) → 2 N2(g) + O2(g) ,what is the concentration of N2O after 3 half-lives if 0.15 mol of N2O is initially placed into in a 1.00-L reaction vessel?

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 decomposition of ozone in the stratosphere can occur by the following two-step mechanism: Step 1: Br + O3 → BrO + O2 Step 2: BrO + O → Br + O2 Which species is an intermediate in this mechanism?

Correct AnswerverifiedShow Answer

The decomposition of hydrogen peroxide occurs according to the equation 2 H2O2(aq)→ 2 H2O(l)+ O2(g) A concentration-time study of this reaction produces a straight line when ln[H2O2] is plotted versus time.Therefore,this is a ________ order reaction.

Correct AnswerverifiedShow Answer

What fraction of collisions will have sufficient energy to react for a gas whose activation energy is 68 kJ/mol at 25°C?

Correct AnswerverifiedShow Answer

Hydroquinone,HOC6H6OH,can be formed by the reaction with acetylene below: 2 HCCH + 3 CO + H2O → HOC6H4OH + CO2 How is the rate of disappearance of acetylene,HCCH,related to the appearance of hydroquinone (Hq) ? = ?

Correct AnswerverifiedShow Answer

The isomerization reaction,CH3NC → CH3CN,is first order and the rate constant is equal to 0) 46 s-1 at 600 K.What is the concentration of CH3NC after 0.20 minutes if the initial concentration is 0.30 M?

Correct AnswerverifiedShow Answer

Which of the following does not affect the rate of a bimolecular reaction?

Correct AnswerverifiedShow Answer

For a particular first-order reaction,it takes 24 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 reaction: 2 HI → H2 + I2,is second order and the rate constant at 800 K is 9.70 × 10-2 M-1 s-1.How long will it take for 8.00 × 10-2 mol/L of HI to decrease to one-fourth of its initial concentration?

Correct AnswerverifiedShow Answer

At an elevated temperature the decomposition of a gaseous oxide,AO2 occurs with a rate constant, k = 0.54 M-1s-1.If the half-life of this reaction is 926 seconds when [AO2] = 2.0 × 10-3 M and 462 seconds when [AO2] = 4.0 × 10-3 M,this reaction is ________ order.

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 activation energy for the forward reaction is given by the difference in energy between which two reaction stages?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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 42% of its initial concentration?

Correct Answer
verified

For a reaction that follows the general rate law,Rate = k[A][B]²,what will happen to the rate of reaction if the concentration of B is increased by a factor of 3.00? The rate will

Correct Answer
verified

Which statement is true for the general rate law: Rate = k[A]^m[B]ⁿ?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

For the first-order reaction,2 N₂O(g) → 2 N₂(g) + O₂(g) ,what is the concentration of N₂O after 3 half-lives if 0.15 mol of N₂O is initially placed into in a 1.00-L reaction vessel?

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 decomposition of ozone in the stratosphere can occur by the following two-step mechanism: Step 1: Br + O₃ → BrO + O₂ Step 2: BrO + O → Br + O₂ Which species is an intermediate in this mechanism?

Correct Answer
verified

The decomposition of hydrogen peroxide occurs according to the equation 2 H₂O₂(aq)→ 2 H₂O(l)+ O₂(g) A concentration-time study of this reaction produces a straight line when ln[H₂O₂] is plotted versus time.Therefore,this is a ________ order reaction.

Correct Answer
verified

Correct Answer
verified

Hydroquinone,HOC₆H₆OH,can be formed by the reaction with acetylene below: 2 HCCH + 3 CO + H₂O → HOC₆H₄OH + CO₂ How is the rate of disappearance of acetylene,HCCH,related to the appearance of hydroquinone (Hq) ? = ?

Correct Answer
verified

The isomerization reaction,CH₃NC → CH₃CN,is first order and the rate constant is equal to 0) 46 s^-1 at 600 K.What is the concentration of CH₃NC after 0.20 minutes if the initial concentration is 0.30 M?

Correct Answer
verified

Correct Answer
verified

For a particular first-order reaction,it takes 24 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 reaction: 2 HI → H₂ + I₂,is second order and the rate constant at 800 K is 9.70 × 10^-2 M^-1 s^-1.How long will it take for 8.00 × 10^-2 mol/L of HI to decrease to one-fourth of its initial concentration?

Correct Answer
verified

At an elevated temperature the decomposition of a gaseous oxide,AO₂ occurs with a rate constant, k = 0.54 M^-1s^-1.If the half-life of this reaction is 926 seconds when [AO₂] = 2.0 × 10^-3 M and 462 seconds when [AO₂] = 4.0 × 10^-3 M,this reaction is ________ order.

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 activation energy for the forward reaction is given by the difference in energy between which two reaction stages?

Correct Answer
verified

Correct Answer
verified