Question 1

Termolecular elementary steps are rare.Why?

Accepted Answer

A termolecular elementary step requires ...

Question 2

Which statement concerning relative rates of reaction is correct for the chemical equation given below?
2 CH3OH(g) + 3 O2(g)  →	o→  2 CO2(g) + 4 H2O(g)

Accepted Answer

A)   The rate of disappearance of CH3OH is equal to the rate of disappearance of O2.
B)   The rate of disappearance of CH3OH is two times the rate of appearance of H2O.
C)   The rate of disappearance of CH3OH is half the rate of appearance of CO2.
D)   The rate of appearance of H2O is two times the rate of appearance of CO2.
E)   The rate of appearance of H2O is four times the rate of disappearance of CH3OH. F) B) and C)
G) None of the above

Question 3

For which of the following hypothetical rate laws would the units of the rate constant have the general form M-2.h-1?

Accepted Answer

A)   rate = k[A]3
B)   rate = k[A]2
C)   rate = k[A]
D)   rate = k
E)   rate = k[A]4F) None of the above
G) B) and E)

Question 4

Nitrosyl chloride is produced from the reaction of nitrogen monoxide and chlorine:
2NO(g) + Cl2(g)  →	o→ 2NOCl(g) 
The following initial rates at a given temperature were obtained for the concentrations listed below.
2(g)  	o 2NOCl(g)  The following initial rates at a given temperature were obtained for the concentrations listed below.   What is the experimental rate law? A)  Rate = k[Cl2] B)  Rate = k[NO] C)  Rate = k[NO][Cl2]2 D)  Rate = k[NO]2[Cl2] E)  Rate = k[NO][Cl2]1/2 " class="answers-bank-image d-inline" rel="preload" >
What is the experimental rate law?

Accepted Answer

A)   Rate = k[Cl2]
B)   Rate = k[NO]
C)   Rate = k[NO][Cl2]2
D)   Rate = k[NO]2[Cl2]
E)   Rate = k[NO][Cl2]1/2 F) B) and C)
G) C) and E)

Question 5

A student analyzed a first-order reaction and obtained the graph below.Unfortunately,the student forgot to label the axes.What are the correct labels for the x and y axes?

Accepted Answer

A)   x axis = time,y axis = ln[A]
B)   x axis = ln[time] ,y axis = [A]
C)   x axis = ln[time],y axis = [A]
D)   x axis = time,y axis = 1/[A]
E)   x axis = 1/time,y axis = 1/[A]F) B) and D)
G) A) and D)

Question 6

Which relationship correctly compares the rates of the following reactants and products?
2 NOCl(g)  →	o→  2 NO(g) + Cl2(g)

Accepted Answer

A)   2(g)  
A)     
B)     
C)     
D)     
E)     " class="answers-bank-image d-inline" rel="preload" >
B)   2(g)  
A)     
B)     
C)     
D)     
E)     " class="answers-bank-image d-inline" rel="preload" >
C)   2(g)  
A)     
B)     
C)     
D)     
E)     " class="answers-bank-image d-inline" rel="preload" >
D)   2(g)  
A)     
B)     
C)     
D)     
E)     " class="answers-bank-image d-inline" rel="preload" >
E)   2(g)  
A)     
B)     
C)     
D)     
E)     " class="answers-bank-image d-inline" rel="preload" > F) B) and D)
G) A) and C)

Question 7

If a catalyst is present in a different phase from the reactants and products,it is referred to as a(n)________ catalyst.

Accepted Answer

The answer of If a catalyst is present in a...

Question 8

For a chemical reaction,the activation energy for the forward reaction is +181 kJ and the activation energy for the backward reaction is +62 kJ.What is the overall energy change for the forward reaction?

Accepted Answer

A)   -119 kJ
B)   -62 kJ
C)   +119 kJ
D)   +181 kJ
E)   +243 kJF) All of the above
G) B) and D)

Question 9

Given the initial rate data for the reaction A + B  →	o→  C,determine the rate expression for the reaction.

Accepted Answer

A)   
B)   
C)   
D)   
E)    F) C) and E)
G) B) and C)

Question 10

Consider the exothermic combustion of coal.Which of the following could increase the rate of reaction?

Accepted Answer

A)   using smaller pieces of coal
B)   increasing the concentration of oxygen
C)   lowering the temperature
D)   both (a) and (b) are correct
E)   choices (a) ,(b) and (c) are all correctF) A) and E)
G) B) and E)

Question 11

A suggested mechanism for the decomposition of ozone is as follows:
2[O] [O3] C)  Rate =   D)  Rate =   E)  Rate =  " class="answers-bank-image d-inline" rel="preload" >
What is the rate law predicted by this mechanism?

Accepted Answer

A)   Rate = 2[O] [O3] 
C)   Rate =   
D)   Rate =   
E)   Rate =  " class="answers-bank-image d-inline" rel="preload" >
B)   Rate = k2[O] [O3]
C)   Rate = 2[O] [O3] 
C)   Rate =   
D)   Rate =   
E)   Rate =  " class="answers-bank-image d-inline" rel="preload" >
D)   Rate = 2[O] [O3] 
C)   Rate =   
D)   Rate =   
E)   Rate =  " class="answers-bank-image d-inline" rel="preload" >
E)   Rate = 2[O] [O3] 
C)   Rate =   
D)   Rate =   
E)   Rate =  " class="answers-bank-image d-inline" rel="preload" >F) A) and C)
G) D) and E)

Question 12

The rate constant of a first-order decomposition reaction is 0.0147 s-1.If the initial concentration of reactant is 0.178 M,what is the concentration of reactant after 30.0 seconds?

Accepted Answer

A)   8.72  ×	imes×  105 M
B)   0.0645 M
C)   0.115 M
D)   0.0785 M
E)   0.643 M F) A) and C)
G) A) and B)

Question 13

Which of the following statements is correct for the first-order reaction: A  →	o→  2B?

Accepted Answer

A)   The concentration of A decreases linearly with respect to time.
B)   The concentration of A is constant with respect to time.
C)   The natural logarithm of the concentration of A decreases linearly with respect to time.
D)   The rate of reaction is constant with respect to time.
E)   The rate constant,k,of the reaction decreases linearly with respect to time. F) A) and B)
G) A) and E)

Question 14

The decomposition of formic acid follows first-order kinetics.
HCO2H(g)  →	o→  CO2(g) + H2(g) 
The half-life for the reaction at 550  ∘\circ∘ C is 24 seconds.How many seconds does it take for the formic acid concentration to decrease by 87.5%?

Accepted Answer

A)   24 s
B)   36 s
C)   48 s
D)   72 s
E)   96 s F) C) and D)
G) B) and E)

Question 15

The elementary steps for the catalyzed decomposition of dinitrogen monoxide are shown below.
N2O(g) + NO(g)  →	o→  N2(g) + NO2(g) 
NO2(g)  →	o→  NO(g) + 1/2 O2(g) 
Which of the following statements is/are CORRECT?
1) The overall balanced reaction is N2O(g)  →	o→ N2(g) + 1/2 O2(g) .
2) NO2(g) is a catalyst for the reaction.
3) NO(g) is a reaction intermediate.

Accepted Answer

A)   1 only
B)   2 only
C)   3 only
D)   1 and 3
E)   1,2,and 3 F) A) and D)
G) None of the above

Question 16

The following data were obtained in a kinetics study of the hypothetical reaction A + B + C  →	o→  products.

Using the initial-rate method,what is the order of the reaction with respect to B?

Accepted Answer

A)   zero-order
B)   first-order
C)   second-order
D)   third-order
E)   impossible to tell from the data given F) B) and C)
G) None of the above

Question 17

Hydrogen peroxide decomposes into water and oxygen in a first-order process.H2O2(aq)  →	o→  H2O( 2O2(aq)  	o  H2O(   ) + 1/2 O2(g)  At 20.0  \circ C,the half-life for the reaction is 3.92  	imes 104 seconds.If the initial concentration of hydrogen peroxide is 0.52 M,what is the concentration after 7.00 days? A)  1.2  	imes  10-5 M B)  0.034 M C)  0.074 M D)  0.22 M E)  0.52 M " class="answers-bank-image d-inline" rel="preload" > ) + 1/2 O2(g) 
At 20.0  ∘\circ∘ C,the half-life for the reaction is 3.92  ×	imes× 104 seconds.If the initial concentration of hydrogen peroxide is 0.52 M,what is the concentration after 7.00 days?

Accepted Answer

A)   1.2  ×	imes×  10-5 M
B)   0.034 M
C)   0.074 M
D)   0.22 M
E)   0.52 M F) B) and E)
G) C) and D)

Question 18

Which of the following conclusions concerning the concentration-time plot provided below is/are correct?
1) The concentration of substance D is decreasing over time.
2) The instantaneous reaction rate at point A is less than the instantaneous reaction rate at point B.
3) Substance D is a product of the reaction.

Accepted Answer

A)   1 only
B)   2 only
C)   3 only
D)   1 and 3
E)   1,2,and 3F) B) and C)
G) None of the above

Question 19

For the reaction A + 2B  →	o→  C,the rate law is 
 .
What are the units of the rate constant where time is measured in seconds?

Accepted Answer

A)   
B)   
C)   
D)   
E)    F) B) and E)
G) A) and D)

Question 20

A second-order reaction starts with an initial concentration of 0.100 mol/L of the reactant.If the rate constant is 1.4  ×	imes×  10-2 L/mol·s,what is the time required to decrease the initial concentration to 0.050 mol/L?
2A  →	o→  B          ~~~~~~~~         rate = k[A]2

Accepted Answer

A)   710 s
B)   1100 s
C)   49.5 s
D)   3.57 s
E)   2100 s F) All of the above
G) A) and E)

Exam 15: Chemical Kinetics: the Rates of Chemical Reactions

Correct Answer
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Correct Answer
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Termolecular elementary steps are rare.Why?

Correct Answer
verified
A termolecular elementary step requires ...
View Answer

Correct Answer
verified

The rate constant of a first-order decomposition reaction is 0.0147 s^-1.If the initial concentration of reactant is 0.178 M,what is the concentration of reactant after 30.0 seconds?

Correct Answer
verified

A second-order reaction starts with an initial concentration of 0.100 mol/L of the reactant.If the rate constant is 1.4 $\times$ 10^-2 L/mol·s,what is the time required to decrease the initial concentration to 0.050 mol/L? 2A $\to$ B $~~~~~~~~$ rate = k[A]²

Correct Answer
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A student analyzed a first-order reaction and obtained the graph below.Unfortunately,the student forgot to label the axes.What are the correct labels for the x and y axes?

Correct Answer
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For a chemical reaction,the activation energy for the forward reaction is +181 kJ and the activation energy for the backward reaction is +62 kJ.What is the overall energy change for the forward reaction?

Correct Answer
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For which of the following hypothetical rate laws would the units of the rate constant have the general form M^-2.h^-1?

Correct Answer
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The decomposition of formic acid follows first-order kinetics. HCO₂H(g) $\to$ CO₂(g) + H₂(g) The half-life for the reaction at 550 ^$\circ$C is 24 seconds.How many seconds does it take for the formic acid concentration to decrease by 87.5%?

Correct Answer
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Correct Answer
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Which relationship correctly compares the rates of the following reactants and products? 2 NOCl(g) $\to$ 2 NO(g) + Cl₂(g)

Correct Answer
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A suggested mechanism for the decomposition of ozone is as follows: What is the rate law predicted by this mechanism?

Correct Answer
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For the reaction A + 2B $\to$ C,the rate law is $For the reaction A + 2B \to C,the rate law is . What are the units of the rate constant where time is measured in seconds? A) B) C) D) E)$ . What are the units of the rate constant where time is measured in seconds?

Correct Answer
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Which statement concerning relative rates of reaction is correct for the chemical equation given below? 2 CH₃OH(g) + 3 O₂(g) $\to$ 2 CO₂(g) + 4 H₂O(g)

Correct Answer
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Correct Answer
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Consider the exothermic combustion of coal.Which of the following could increase the rate of reaction?

Correct Answer
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Which of the following statements is correct for the first-order reaction: A $\to$ 2B?

Correct Answer
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Given the initial rate data for the reaction A + B $\to$ C,determine the rate expression for the reaction. $Given the initial rate data for the reaction A + B \to C,determine the rate expression for the reaction. A) B) C) D) E)$

Correct Answer
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If a catalyst is present in a different phase from the reactants and products,it is referred to as a(n)________ catalyst.

Correct Answer
verified

Exam 15: Chemical Kinetics: the Rates of Chemical Reactions

Correct AnswerverifiedShow Answer

The following data were obtained in a kinetics study of the hypothetical reaction A + B + C →\to→ products. Using the initial-rate method,what is the order of the reaction with respect to B?

Correct AnswerverifiedShow Answer

Termolecular elementary steps are rare.Why?

Correct AnswerverifiedA termolecular elementary step requires ...View AnswerShow Answer

Nitrosyl chloride is produced from the reaction of nitrogen monoxide and chlorine: 2NO(g) + Cl2(g) →\to→ 2NOCl(g) The following initial rates at a given temperature were obtained for the concentrations listed below. What is the experimental rate law?

Correct AnswerverifiedShow Answer

The rate constant of a first-order decomposition reaction is 0.0147 s-1.If the initial concentration of reactant is 0.178 M,what is the concentration of reactant after 30.0 seconds?

Correct AnswerverifiedShow Answer

A second-order reaction starts with an initial concentration of 0.100 mol/L of the reactant.If the rate constant is 1.4 ×\times× 10-2 L/mol·s,what is the time required to decrease the initial concentration to 0.050 mol/L? 2A →\to→ B ~~~~~~~~ rate = k[A]2

Correct AnswerverifiedShow Answer

A student analyzed a first-order reaction and obtained the graph below.Unfortunately,the student forgot to label the axes.What are the correct labels for the x and y axes?

Correct AnswerverifiedShow Answer

For a chemical reaction,the activation energy for the forward reaction is +181 kJ and the activation energy for the backward reaction is +62 kJ.What is the overall energy change for the forward reaction?

Correct AnswerverifiedShow Answer

For which of the following hypothetical rate laws would the units of the rate constant have the general form M-2.h-1?

Correct AnswerverifiedShow Answer

The decomposition of formic acid follows first-order kinetics. HCO2H(g) →\to→ CO2(g) + H2(g) The half-life for the reaction at 550 ∘\circ∘ C is 24 seconds.How many seconds does it take for the formic acid concentration to decrease by 87.5%?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which relationship correctly compares the rates of the following reactants and products? 2 NOCl(g) →\to→ 2 NO(g) + Cl2(g)

Correct AnswerverifiedShow Answer

A suggested mechanism for the decomposition of ozone is as follows: What is the rate law predicted by this mechanism?

Correct AnswerverifiedShow Answer

For the reaction A + 2B →\to→ C,the rate law is . What are the units of the rate constant where time is measured in seconds?

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Which statement concerning relative rates of reaction is correct for the chemical equation given below? 2 CH3OH(g) + 3 O2(g) →\to→ 2 CO2(g) + 4 H2O(g)

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Consider the exothermic combustion of coal.Which of the following could increase the rate of reaction?

Correct AnswerverifiedShow Answer

Which of the following statements is correct for the first-order reaction: A →\to→ 2B?

Correct AnswerverifiedShow Answer

Given the initial rate data for the reaction A + B →\to→ C,determine the rate expression for the reaction.

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If a catalyst is present in a different phase from the reactants and products,it is referred to as a(n)________ catalyst.

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
verified

Correct Answer
verified
A termolecular elementary step requires ...
View Answer

Correct Answer
verified

The rate constant of a first-order decomposition reaction is 0.0147 s^-1.If the initial concentration of reactant is 0.178 M,what is the concentration of reactant after 30.0 seconds?

Correct Answer
verified

A second-order reaction starts with an initial concentration of 0.100 mol/L of the reactant.If the rate constant is 1.4 $\times$ 10^-2 L/mol·s,what is the time required to decrease the initial concentration to 0.050 mol/L? 2A $\to$ B $~~~~~~~~$ rate = k[A]²

Correct Answer
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Correct Answer
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Correct Answer
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For which of the following hypothetical rate laws would the units of the rate constant have the general form M^-2.h^-1?

Correct Answer
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The decomposition of formic acid follows first-order kinetics. HCO₂H(g) $\to$ CO₂(g) + H₂(g) The half-life for the reaction at 550 ^$\circ$C is 24 seconds.How many seconds does it take for the formic acid concentration to decrease by 87.5%?

Correct Answer
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Correct Answer
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Which relationship correctly compares the rates of the following reactants and products? 2 NOCl(g) $\to$ 2 NO(g) + Cl₂(g)

Correct Answer
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Correct Answer
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For the reaction A + 2B $\to$ C,the rate law is $For the reaction A + 2B \to C,the rate law is . What are the units of the rate constant where time is measured in seconds? A) B) C) D) E)$ . What are the units of the rate constant where time is measured in seconds?

Correct Answer
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Which statement concerning relative rates of reaction is correct for the chemical equation given below? 2 CH₃OH(g) + 3 O₂(g) $\to$ 2 CO₂(g) + 4 H₂O(g)

Correct Answer
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Correct Answer
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Correct Answer
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Which of the following statements is correct for the first-order reaction: A $\to$ 2B?

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Given the initial rate data for the reaction A + B $\to$ C,determine the rate expression for the reaction. $Given the initial rate data for the reaction A + B \to C,determine the rate expression for the reaction. A) B) C) D) E)$

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Correct Answer
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