Question 1

Explain what is meant by the molecularity of a reaction.

Accepted Answer

See Sectio...

Question 2

The following questions refer to the reaction 2A2 + B2 → 2C. The mechanism below has been proposed: 2 + B2 → 2C. The mechanism below has been proposed:   -Raw milk sours in 4.0 h at 28°C but takes 48 h to sour in a refrigerator at 5°C. Calculate the activation energy for the souring of milk. A)  8.87 kJ B)  4.00 kJ C)  12.0 kJ D)  75.2 kJ E)  none of these" class="answers-bank-image d-inline" rel="preload" >
-Raw milk sours in 4.0 h at 28°C but takes 48 h to sour in a refrigerator at 5°C. Calculate the activation energy for the souring of milk.

Accepted Answer

A)   8.87 kJ
B)   4.00 kJ
C)   12.0 kJ
D)   75.2 kJ
E)   none of theseF) B) and C)
G) C) and E)

Question 3

The reaction
2NOBr → 2NO + Br2
exhibits the rate law
Rate = k[NOBr]2 2 exhibits the rate law Rate = k[NOBr]2   where k = 1.0 × 10-5 M-1 • s-1 at 25° C. This reaction is run where the initial concentration of NOBr ([NOBr]0)  is 1.00 × 10-1 M. -What is one half-life for this experiment? A)  1.0 × 106 s B)  6.9 × 104 s C)  5.0 × 10-1 s D)  1.0 × 10-5 s E)  none of these" class="answers-bank-image d-inline" rel="preload" > where k = 1.0 × 10-5 M-1 • s-1 at 25° C. This reaction is run where the initial concentration of NOBr ([NOBr]0)  is 1.00 × 10-1 M.
-What is one half-life for this experiment?

Accepted Answer

A)   1.0 × 106 s
B)   6.9 × 104 s
C)   5.0 × 10-1 s
D)   1.0 × 10-5 s
E)   none of theseF) A) and B)
G) All of the above

Question 4

The following data were collected for the decay of HO2 radicals. 2 radicals.   Which of the following statements is true? A)  The half-life of the reaction is 2 ms. B)  A plot of 1/[HO2] versus time gives a straight line. C)  The rate of the reaction increases with time. D)  The decay of HO2 occurs by a first-order process. E)  A plot of ln [HO2] versus time is linear with a slope of -k." class="answers-bank-image d-inline" rel="preload" > Which of the following statements is true?

Accepted Answer

A)   The half-life of the reaction is 2 ms.
B)   A plot of 1/[HO2] versus time gives a straight line.
C)   The rate of the reaction increases with time.
D)   The decay of HO2 occurs by a first-order process.
E)   A plot of ln [HO2] versus time is linear with a slope of -k.F) All of the above
G) A) and B)

Question 5

Calculate the value of k2 where
Rate = 2 where Rate =   K2[B]2 A)  0.75 L/mol • s B)  2.2 L/mol • s C)  0.21 L/mol • s D)  1.9 L/mol • s E)  none of these" class="answers-bank-image d-inline" rel="preload" >
K2[B]2

Accepted Answer

A)   0.75 L/mol • s
B)   2.2 L/mol • s
C)   0.21 L/mol • s
D)   1.9 L/mol • s
E)   none of theseF) C) and D)
G) B) and E)

Question 6

For the reaction aA → products, select the reaction order(s)  that best fit(s)  the observations.
-[A] is constant.

Accepted Answer

A)   zero order in A
B)   second order in A
C)   first order in A
D)   all of these
E)   none of theseF) A) and D)
G) C) and E)

Question 7

At 760 K, acetaldehyde decomposes to carbon monoxide and methane:
CH3CHO ⎯⎯→ CH4 + CO
A plot of ln [CH3CHO] versus time is linear. After 530 s, [CH3CHO] decreases to one half of its initial value of 0.10 M. What is the rate law for the reaction?

Accepted Answer

A)   3CHO ⎯⎯→ CH4 + CO A plot of ln [CH3CHO] versus time is linear. After 530 s, [CH3CHO] decreases to one half of its initial value of 0.10 M. What is the rate law for the reaction? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
B)   3CHO ⎯⎯→ CH4 + CO A plot of ln [CH3CHO] versus time is linear. After 530 s, [CH3CHO] decreases to one half of its initial value of 0.10 M. What is the rate law for the reaction? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
C)   3CHO ⎯⎯→ CH4 + CO A plot of ln [CH3CHO] versus time is linear. After 530 s, [CH3CHO] decreases to one half of its initial value of 0.10 M. What is the rate law for the reaction? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
D)   3CHO ⎯⎯→ CH4 + CO A plot of ln [CH3CHO] versus time is linear. After 530 s, [CH3CHO] decreases to one half of its initial value of 0.10 M. What is the rate law for the reaction? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
E)   3CHO ⎯⎯→ CH4 + CO A plot of ln [CH3CHO] versus time is linear. After 530 s, [CH3CHO] decreases to one half of its initial value of 0.10 M. What is the rate law for the reaction? 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >F) C) and D)
G) A) and B)

Question 8

A first-order reaction is 58% complete at the end of 11 min. What is the value of the rate constant?

Accepted Answer

A)   0.079 min-1
B)   0.37 min-1
C)   7.9 × 10-2 min-1
D)   3.4 × 10-2 min-1
E)   5.0× 10-2 min-1F) B) and C)
G) A) and E)

Question 9

A general reaction written as 2A + 2B → C + 2D is studied and yields the following data. 
-What is the order of the reaction with respect to A?

Accepted Answer

A)   1
B)   0
C)   4
D)   3
E)   2F) A) and B)
G) A) and E)

Question 10

Consider the reaction
3A + B + C → D + E
where the rate law is defined as 2[B][C] An experiment is carried out where [B]0 = [C]0 = 1.00 M and [A]0 = 1.00 × 10-4 M. -What is the concentration of A after 10.0 min? A)  9.80 × 10-6 M B)  2.38 × 10-6 M C)  1.27 × 10-5 M D)  1.06 × 10-9 M E)  none of these" class="answers-bank-image d-inline" rel="preload" > k[A]2[B][C]
An experiment is carried out where [B]0 = [C]0 = 1.00 M and [A]0 = 1.00 × 10-4 M.
-What is the concentration of A after 10.0 min?

Accepted Answer

A)   9.80 × 10-6 M
B)   2.38 × 10-6 M
C)   1.27 × 10-5 M
D)   1.06 × 10-9 M
E)   none of theseF) B) and D)
G) All of the above

Question 11

For the reaction 2N2O5(g)  → 4NO2(g)  + O2(g) , the following data were collected. 2O5(g)  → 4NO2(g)  + O2(g) , the following data were collected.   -The concentration of O2 at t = 10. min is A)  0.32 × 10-2 mol/L B)  2.0 × 10-4 mol/L C)  0.64 × 10-2 mol/L D)  0.16 × 10-2 mol/L E)  none of these" class="answers-bank-image d-inline" rel="preload" >
-The concentration of O2 at t = 10. min is

Accepted Answer

A)   0.32 × 10-2 mol/L
B)   2.0 × 10-4 mol/L
C)   0.64 × 10-2 mol/L
D)   0.16 × 10-2 mol/L
E)   none of theseF) A) and E)
G) A) and B)

Question 12

For the reaction aA → products, select the reaction order(s)  that best fit(s)  the observations.
-A plot of k vs. 1/T gives a straight line.

Accepted Answer

A)   first order in A
B)   zero order in A
C)   second order in A
D)   all of these
E)   none of theseF) A) and B)
G) B) and C)

Question 13

For the reaction in the presence of mercury vapor
C2H4 + H2 → C2H6
a possible mechanism is  
Determine the rate law for the production of C2H6 using the steady-state approximation for H and for C2H5.

Accepted Answer

Question 14

Initial rate data have been determined at a certain temperature for the gaseous reaction
2NO + 2H2 → N2 + 2H2O 2 → N2 + 2H2O   What is the numerical value of the rate constant? A)  1.5 B)  9.9 C)  3.0 D)  0.13 E)  0.44" class="answers-bank-image d-inline" rel="preload" >
What is the numerical value of the rate constant?

Accepted Answer

A)   1.5
B)   9.9
C)   3.0
D)   0.13
E)   0.44F) A) and B)
G) B) and D)

Question 15

The decomposition of N2O5(g)  to NO2(g)  and O2(g)  obeys first-order kinetics. Assume the form of the rate law is
Rate 2O5(g)  to NO2(g)  and O2(g)  obeys first-order kinetics. Assume the form of the rate law is Rate   where k = 3.4 × 10-5 s-1 at 25°C. -The reaction A → B + C is known to be zero order in A with a rate constant of 3.8× 10-2 mol/L • s at 25° C. An experiment was run at 25°C where [A]0 = 1.0 × 10-3 M. What is the rate after 6.5 minutes? A)  1.0 × 10-3 mol/L • s B)  3.8 × 10-2 mol/L • s C)  3.8 × 10-5 mol/L • s D)  3.7 × 10-4 mol/L • s E)  1.5 × 10-11 mol/L • s" class="answers-bank-image d-inline" rel="preload" > where k = 3.4 × 10-5 s-1 at 25°C.
-The reaction A → B + C is known to be zero order in A with a rate constant of 3.8× 10-2 mol/L • s at 25° C. An experiment was run at 25°C where [A]0 = 1.0 × 10-3 M. What is the rate after 6.5 minutes?

Accepted Answer

A)   1.0 × 10-3 mol/L • s
B)   3.8 × 10-2 mol/L • s
C)   3.8 × 10-5 mol/L • s
D)   3.7 × 10-4 mol/L • s
E)   1.5 × 10-11 mol/L • sF) All of the above
G) A) and D)

Question 16

The reaction
H2SeO3(aq)  + 6I-(aq)  + 4H+(aq)  → 2I3-(aq)  + 3H2O(l)  + Se(s) 
was studied at 0°C by the method of initial rates: 2SeO3(aq)  + 6I-(aq)  + 4H+(aq)  → 2I3-(aq)  + 3H2O(l)  + Se(s)  was studied at 0°C by the method of initial rates:   -What is the numerical value of the rate constant? A)  4.2 B)  2.1 × 102 C)  5.2 × 105 D)  1.9 × 10-6 E)  none of these" class="answers-bank-image d-inline" rel="preload" >
-What is the numerical value of the rate constant?

Accepted Answer

A)   4.2
B)   2.1 × 102
C)   5.2 × 105
D)   1.9 × 10-6
E)   none of theseF) A) and B)
G) B) and E)

Question 17

_____ is defined as the number of species that must collide to produce the reaction indicated by an elementary step.

Accepted Answer

A)   ​Molality
B)   ​Polarity
C)   ​Delocalization
D)   ​Molecularity
E)   ​IsomerizationF) B) and D)
G) C) and E)

Question 18

For a reaction a A → products, [A]0 = 4.0 M, and the first three successive half-lives are 48, 96, and 192 min.
-Calculate k (without units) .

Accepted Answer

A)   5.2 × 10-3
B)   1.4 × 10-2
C)   2.6 × 10-3
D)   4.1 × 10-3
E)   none of theseF) C) and D)
G) A) and C)

Question 19

A general reaction written as 2A + 2B → C + 2D is studied and yields the following data. -1 s-1 B)  s-1 C)  L3 mol-3 s-1 D)  mol L-1 s-1 E)  L2 mol-2 s-1" class="answers-bank-image d-inline" rel="preload" >
-What are the proper units for the rate constant for the reaction?

Accepted Answer

A)   L mol-1 s-1
B)   s-1
C)   L3 mol-3 s-1
D)   mol L-1 s-1
E)   L2 mol-2 s-1F) C) and E)
G) None of the above

Question 20

A general reaction written as 2A + 2B → C + 2D is studied and yields the following data. -5 B)  1.60 × 10-4 C)  4.00 × 10-5 D)  2.00 × 10-5 E)  none of these" class="answers-bank-image d-inline" rel="preload" >
-For the first of the reactions in the table of data, determine -Δ[B]/Δt.

Accepted Answer

A)   8.00 × 10-5
B)   1.60 × 10-4
C)   4.00 × 10-5
D)   2.00 × 10-5
E)   none of theseF) C) and D)
G) B) and C)

Exam 15: Chemical Kinetics

The reaction H₂SeO₃(aq) + 6I^-(aq) + 4H⁺(aq) → 2I₃^-(aq) + 3H₂O(l) + Se(s) was studied at 0°C by the method of initial rates: -What is the numerical value of the rate constant?

Correct Answer
verified

For the reaction 2N₂O₅(g) → 4NO₂(g) + O₂(g) , the following data were collected. -The concentration of O₂ at t = 10. min is

Correct Answer
verified

For the reaction in the presence of mercury vapor C₂H₄ + H₂ → C₂H₆a possible mechanism is Determine the rate law for the production of C₂H₆ using the steady-state approximation for H and for C₂H₅.

Correct Answer
verified

For the reaction aA → products, select the reaction order(s) that best fit(s) the observations. -[A] is constant.

Correct Answer
verified

A general reaction written as 2A + 2B → C + 2D is studied and yields the following data. -What is the order of the reaction with respect to A?

Correct Answer
verified

Correct Answer
verified

For a reaction a A → products, [A]₀ = 4.0 M, and the first three successive half-lives are 48, 96, and 192 min. -Calculate k (without units) .

Correct Answer
verified

For the reaction aA → products, select the reaction order(s) that best fit(s) the observations. -A plot of k vs. 1/T gives a straight line.

Correct Answer
verified

A general reaction written as 2A + 2B → C + 2D is studied and yields the following data. -For the first of the reactions in the table of data, determine -Δ[B]/Δt.

Correct Answer
verified

The following questions refer to the reaction 2A₂ + B₂ → 2C. The mechanism below has been proposed: -Raw milk sours in 4.0 h at 28°C but takes 48 h to sour in a refrigerator at 5°C. Calculate the activation energy for the souring of milk.

Correct Answer
verified

A general reaction written as 2A + 2B → C + 2D is studied and yields the following data. -What are the proper units for the rate constant for the reaction?

Correct Answer
verified

At 760 K, acetaldehyde decomposes to carbon monoxide and methane: CH₃CHO ⎯⎯→ CH₄ + CO A plot of ln [CH₃CHO] versus time is linear. After 530 s, [CH₃CHO] decreases to one half of its initial value of 0.10 M. What is the rate law for the reaction?

Correct Answer
verified

The following data were collected for the decay of HO₂ radicals. Which of the following statements is true?

Correct Answer
verified

Calculate the value of k₂ where Rate = K₂[B]²

Correct Answer
verified

A first-order reaction is 58% complete at the end of 11 min. What is the value of the rate constant?

Correct Answer
verified

The reaction 2NOBr → 2NO + Br₂exhibits the rate law Rate = k[NOBr]² where k = 1.0 × 10^-5 M^-1 • s^-1 at 25° C. This reaction is run where the initial concentration of NOBr ([NOBr]₀) is 1.00 × 10^-1 M. -What is one half-life for this experiment?

Correct Answer
verified

Initial rate data have been determined at a certain temperature for the gaseous reaction 2NO + 2H₂ → N₂ + 2H₂O What is the numerical value of the rate constant?

Correct Answer
verified

Explain what is meant by the molecularity of a reaction.

Correct Answer
verified
See Sectio...
View Answer

Consider the reaction 3A + B + C → D + E where the rate law is defined as k[A]²[B][C] An experiment is carried out where [B]₀ = [C]₀ = 1.00 M and [A]₀ = 1.00 × 10^-4 M. -What is the concentration of A after 10.0 min?

Correct Answer
verified

_____ is defined as the number of species that must collide to produce the reaction indicated by an elementary step.

Correct Answer
verified

Exam 15: Chemical Kinetics

The reaction H2SeO3(aq) + 6I-(aq) + 4H+(aq) → 2I3-(aq) + 3H2O(l) + Se(s) was studied at 0°C by the method of initial rates: -What is the numerical value of the rate constant?

Correct AnswerverifiedShow Answer

For the reaction 2N2O5(g) → 4NO2(g) + O2(g) , the following data were collected. -The concentration of O2 at t = 10. min is

Correct AnswerverifiedShow Answer

For the reaction in the presence of mercury vapor C2H4 + H2 → C2H6 a possible mechanism is Determine the rate law for the production of C2H6 using the steady-state approximation for H and for C2H5.

Correct AnswerverifiedShow Answer

For the reaction aA → products, select the reaction order(s) that best fit(s) the observations. -[A] is constant.

Correct AnswerverifiedShow Answer

A general reaction written as 2A + 2B → C + 2D is studied and yields the following data. -What is the order of the reaction with respect to A?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

For a reaction a A → products, [A]0 = 4.0 M, and the first three successive half-lives are 48, 96, and 192 min. -Calculate k (without units) .

Correct AnswerverifiedShow Answer

For the reaction aA → products, select the reaction order(s) that best fit(s) the observations. -A plot of k vs. 1/T gives a straight line.

Correct AnswerverifiedShow Answer

A general reaction written as 2A + 2B → C + 2D is studied and yields the following data. -For the first of the reactions in the table of data, determine -Δ[B]/Δt.

Correct AnswerverifiedShow Answer

The following questions refer to the reaction 2A2 + B2 → 2C. The mechanism below has been proposed: -Raw milk sours in 4.0 h at 28°C but takes 48 h to sour in a refrigerator at 5°C. Calculate the activation energy for the souring of milk.

Correct AnswerverifiedShow Answer

A general reaction written as 2A + 2B → C + 2D is studied and yields the following data. -What are the proper units for the rate constant for the reaction?

Correct AnswerverifiedShow Answer

At 760 K, acetaldehyde decomposes to carbon monoxide and methane: CH3CHO ⎯⎯→ CH4 + CO A plot of ln [CH3CHO] versus time is linear. After 530 s, [CH3CHO] decreases to one half of its initial value of 0.10 M. What is the rate law for the reaction?

Correct AnswerverifiedShow Answer

The following data were collected for the decay of HO2 radicals. Which of the following statements is true?

Correct AnswerverifiedShow Answer

Calculate the value of k2 where Rate = K2[B]2

Correct AnswerverifiedShow Answer

A first-order reaction is 58% complete at the end of 11 min. What is the value of the rate constant?

Correct AnswerverifiedShow Answer

The reaction 2NOBr → 2NO + Br2 exhibits the rate law Rate = k[NOBr]2 where k = 1.0 × 10-5 M-1 • s-1 at 25° C. This reaction is run where the initial concentration of NOBr ([NOBr]0) is 1.00 × 10-1 M. -What is one half-life for this experiment?

Correct AnswerverifiedShow Answer

Initial rate data have been determined at a certain temperature for the gaseous reaction 2NO + 2H2 → N2 + 2H2O What is the numerical value of the rate constant?

Correct AnswerverifiedShow Answer

Explain what is meant by the molecularity of a reaction.

Correct AnswerverifiedSee Sectio...View AnswerShow Answer

Consider the reaction 3A + B + C → D + E where the rate law is defined as k[A]2[B][C] An experiment is carried out where [B]0 = [C]0 = 1.00 M and [A]0 = 1.00 × 10-4 M. -What is the concentration of A after 10.0 min?

Correct AnswerverifiedShow Answer

_____ is defined as the number of species that must collide to produce the reaction indicated by an elementary step.

Correct AnswerverifiedShow Answer

The reaction H₂SeO₃(aq) + 6I^-(aq) + 4H⁺(aq) → 2I₃^-(aq) + 3H₂O(l) + Se(s) was studied at 0°C by the method of initial rates: -What is the numerical value of the rate constant?

Correct Answer
verified

For the reaction 2N₂O₅(g) → 4NO₂(g) + O₂(g) , the following data were collected. -The concentration of O₂ at t = 10. min is

Correct Answer
verified

For the reaction in the presence of mercury vapor C₂H₄ + H₂ → C₂H₆a possible mechanism is Determine the rate law for the production of C₂H₆ using the steady-state approximation for H and for C₂H₅.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

For a reaction a A → products, [A]₀ = 4.0 M, and the first three successive half-lives are 48, 96, and 192 min. -Calculate k (without units) .

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The following questions refer to the reaction 2A₂ + B₂ → 2C. The mechanism below has been proposed: -Raw milk sours in 4.0 h at 28°C but takes 48 h to sour in a refrigerator at 5°C. Calculate the activation energy for the souring of milk.

Correct Answer
verified

Correct Answer
verified

At 760 K, acetaldehyde decomposes to carbon monoxide and methane: CH₃CHO ⎯⎯→ CH₄ + CO A plot of ln [CH₃CHO] versus time is linear. After 530 s, [CH₃CHO] decreases to one half of its initial value of 0.10 M. What is the rate law for the reaction?

Correct Answer
verified

The following data were collected for the decay of HO₂ radicals. Which of the following statements is true?

Correct Answer
verified

Calculate the value of k₂ where Rate = K₂[B]²

Correct Answer
verified

Correct Answer
verified

The reaction 2NOBr → 2NO + Br₂exhibits the rate law Rate = k[NOBr]² where k = 1.0 × 10^-5 M^-1 • s^-1 at 25° C. This reaction is run where the initial concentration of NOBr ([NOBr]₀) is 1.00 × 10^-1 M. -What is one half-life for this experiment?

Correct Answer
verified

Initial rate data have been determined at a certain temperature for the gaseous reaction 2NO + 2H₂ → N₂ + 2H₂O What is the numerical value of the rate constant?

Correct Answer
verified

Correct Answer
verified
See Sectio...
View Answer

Consider the reaction 3A + B + C → D + E where the rate law is defined as k[A]²[B][C] An experiment is carried out where [B]₀ = [C]₀ = 1.00 M and [A]₀ = 1.00 × 10^-4 M. -What is the concentration of A after 10.0 min?

Correct Answer
verified

Correct Answer
verified