Question 1

A compound decomposes by a first-order process. If 17.0% of the compound decomposes in 60.0 minutes, the half-life of the compound is __________.

Accepted Answer

A)  141 minutes
B)  181 minutes
C)  198 minutes
D)  223 minutes
E)  325 minutes

Question 2

The graph shown below depicts the relationship between concentration and time for the following chemical reaction. o D) -k E) 1/k" class="answers-bank-image d-inline" rel="preload" > The slope of this line is equal to __________.

Accepted Answer

A)  k
B)  -1/k
C)  ln[A]o
D)  -k
E)  1/k

Question 3

Elementary reactions involving the simultaneous collision of three molecules are __________.

Accepted Answer

The answer of Elementary reactions involving the simultaneous collision of...

Question 4

At elevated temperatures, methylisonitrile (CH3NC) isomerizes to acetonitrile (CH3CN) : CH3NC (g) → CH3CN (g) 
At the start of the experiment, there are 0.200 mol of reactant (CH3NC) and 0 mol of product (CH3CN) in the reaction vessel. After 25 min of reaction, 0.108 mol of reactant (CH3NC) remain. The average rate of decomposition of methyl isonitrile, CH3NC, in this 25 min period is __________ mol/min.

Accepted Answer

A)  3.7 × 10-3
B)  0.092
C)  2.3
D)  4.3 × 10-3
E)  0.54

Question 5

The reaction 2NO2 → 2NO + O2
Follows second-order kinetics. At 300°C, [NO2] drops from 0.0100 M to 0.00650 M in 100.0 s. The rate constant for the reaction is __________ M-1s-1.

Accepted Answer

A)  0.096
B)  0.65
C)  0.81
D)  1.2
E)  0.54

Question 6

How many moles of B are present at 10 s?

Accepted Answer

A)  0.011
B)  0.220
C)  0.110
D)  0.014
E)  1.4 × 10-3

Question 7

What is the overall order of the reaction?

Accepted Answer

A)  4
B)  0
C)  1
D)  2
E)  3

Question 8

__________ are used in automotive catalytic converters.

Accepted Answer

A)  Heterogeneous catalysts
B)  Homogeneous catalysts
C)  Enzymes
D)  Noble gases
E)  Nonmetal oxides

Question 9

The overall order of a reaction is 2. The units of the rate constant for the reaction are __________.

Accepted Answer

A)  M/s
B)  M-1s-1
C)  1/s
D)  1/M
E)  s/M2

Question 10

The order of the reaction in A is __________.

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  0

Question 11

Rates of reaction can be positive or negative.

Accepted Answer

A) True 
 B)False

Question 12

Nitrogen fixation is a difficult process because __________.

Accepted Answer

A)  there is so little nitrogen in the atmosphere
B)  nitrogen exists in the atmosphere primarily as its oxides which are very unreactive
C)  nitrogen is very unreactive, largely due to its triple bond
D)  of the extreme toxicity of nitrogen
E)  of the high polarity of nitrogen molecules preventing them from dissolving in biological fluids, such as those inside cells

Question 13

The rate constant for a second-order reaction is 0.13 M-1s-1. If the initial concentration of reactant is 0.26 mol/L, it takes __________ s for the concentration to decrease to 0.11 mol/L.

Accepted Answer

A)  0.017
B)  0.68
C)  9.1
D)  40.
E)  5.2

Question 14

The rate of disappearance of HBr in the gas phase reaction 2HBr (g) → H2 (g) + Br2 (g) 
Is 0.301 Ms-1 at 150°C. The rate of appearance of Br2 is __________ Ms-1.

Accepted Answer

A)  1.66
B)  0.151
C)  0.0906
D)  0.602
E)  0.549

Question 15

The kinetics of the reaction below were studied and it was determined that the reaction rate increased by a factor of 9 when the concentration of B was tripled. The reaction is __________ order in B. A + B → P

Accepted Answer

A)  zero
B)  first
C)  second
D)  third
E)  one-half

Question 16

At elevated temperatures, methylisonitrile (CH3NC) isomerizes to acetonitrile (CH3CN) : CH3NC (g) → CH3CN (g) 
The dependence of the rate constant on temperature is studied and the graph below is prepared from the results. 3NC) isomerizes to acetonitrile (CH3CN) : CH3NC (g) → CH3CN (g)  The dependence of the rate constant on temperature is studied and the graph below is prepared from the results.   The energy of activation of this reaction is __________ kJ/mol. A) 160 B) 1.6 × 105 C) 4.4 × 10-7 D) 4.4 × 10-4 E) 1.9 × 104" class="answers-bank-image d-inline" rel="preload" > The energy of activation of this reaction is __________ kJ/mol.

Accepted Answer

A)  160
B)  1.6 × 105
C)  4.4 × 10-7
D)  4.4 × 10-4
E)  1.9 × 104

Question 17

Units of the rate constant of a reaction are independent of the overall reaction order.

Accepted Answer

A) True 
 B)False

Question 18

Of the following, all are valid units for a reaction rate except __________.

Accepted Answer

A)  mol/L
B)  M/s
C)  mol/hr
D)  g/s
E)  mol/L-hr

Question 19

A reaction was found to be third order in A. Increasing the concentration of A by a factor of 3 will cause the reaction rate to __________.

Accepted Answer

A)  remain constant
B)  increase by a factor of 27
C)  increase by a factor of 9
D)  triple
E)  decrease by a factor of the cube root of 3

Question 20

In the Arrhenius equation, k = Ae-Ea/RT
__________ is the frequency factor.

Accepted Answer

A)  k
B)  A
C)  e
D)  Ea
E)  R

Exam 14: Chemical Kinetics

Elementary reactions involving the simultaneous collision of three molecules are __________.

Correct Answer
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Of the following, all are valid units for a reaction rate except __________.

Correct Answer
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A compound decomposes by a first-order process. If 17.0% of the compound decomposes in 60.0 minutes, the half-life of the compound is __________.

Correct Answer
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The kinetics of the reaction below were studied and it was determined that the reaction rate increased by a factor of 9 when the concentration of B was tripled. The reaction is __________ order in B. A + B → P

Correct Answer
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The order of the reaction in A is __________.

Correct Answer
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The reaction 2NO₂ → 2NO + O₂ Follows second-order kinetics. At 300°C, [NO₂] drops from 0.0100 M to 0.00650 M in 100.0 s. The rate constant for the reaction is __________ M^-1s^-1.

Correct Answer
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The overall order of a reaction is 2. The units of the rate constant for the reaction are __________.

Correct Answer
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The rate constant for a second-order reaction is 0.13 M^-1s^-1. If the initial concentration of reactant is 0.26 mol/L, it takes __________ s for the concentration to decrease to 0.11 mol/L.

Correct Answer
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The rate of disappearance of HBr in the gas phase reaction 2HBr (g) → H₂ (g) + Br₂ (g) Is 0.301 Ms^-1 at 150°C. The rate of appearance of Br₂ is __________ Ms^-1.

Correct Answer
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At elevated temperatures, methylisonitrile (CH₃NC) isomerizes to acetonitrile (CH₃CN) : CH₃NC (g) → CH₃CN (g) The dependence of the rate constant on temperature is studied and the graph below is prepared from the results. The energy of activation of this reaction is __________ kJ/mol.

Correct Answer
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Nitrogen fixation is a difficult process because __________.

Correct Answer
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__________ are used in automotive catalytic converters.

Correct Answer
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Rates of reaction can be positive or negative.

Correct Answer
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The graph shown below depicts the relationship between concentration and time for the following chemical reaction. The slope of this line is equal to __________.

Correct Answer
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What is the overall order of the reaction?

Correct Answer
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Units of the rate constant of a reaction are independent of the overall reaction order.

Correct Answer
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Correct Answer
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A reaction was found to be third order in A. Increasing the concentration of A by a factor of 3 will cause the reaction rate to __________.

Correct Answer
verified

In the Arrhenius equation, k = Ae^-Ea/RT __________ is the frequency factor.

Correct Answer
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How many moles of B are present at 10 s?

Correct Answer
verified

Exam 14: Chemical Kinetics

Elementary reactions involving the simultaneous collision of three molecules are __________.

Correct AnswerverifiedShow Answer

Of the following, all are valid units for a reaction rate except __________.

Correct AnswerverifiedShow Answer

A compound decomposes by a first-order process. If 17.0% of the compound decomposes in 60.0 minutes, the half-life of the compound is __________.

Correct AnswerverifiedShow Answer

The kinetics of the reaction below were studied and it was determined that the reaction rate increased by a factor of 9 when the concentration of B was tripled. The reaction is __________ order in B. A + B → P

Correct AnswerverifiedShow Answer

The order of the reaction in A is __________.

Correct AnswerverifiedShow Answer

The reaction 2NO2 → 2NO + O2 Follows second-order kinetics. At 300°C, [NO2] drops from 0.0100 M to 0.00650 M in 100.0 s. The rate constant for the reaction is __________ M-1s-1.

Correct AnswerverifiedShow Answer

The overall order of a reaction is 2. The units of the rate constant for the reaction are __________.

Correct AnswerverifiedShow Answer

The rate constant for a second-order reaction is 0.13 M-1s-1. If the initial concentration of reactant is 0.26 mol/L, it takes __________ s for the concentration to decrease to 0.11 mol/L.

Correct AnswerverifiedShow Answer

The rate of disappearance of HBr in the gas phase reaction 2HBr (g) → H2 (g) + Br2 (g) Is 0.301 Ms-1 at 150°C. The rate of appearance of Br2 is __________ Ms-1.

Correct AnswerverifiedShow Answer

At elevated temperatures, methylisonitrile (CH3NC) isomerizes to acetonitrile (CH3CN) : CH3NC (g) → CH3CN (g) The dependence of the rate constant on temperature is studied and the graph below is prepared from the results. The energy of activation of this reaction is __________ kJ/mol.

Correct AnswerverifiedShow Answer

Nitrogen fixation is a difficult process because __________.

Correct AnswerverifiedShow Answer

__________ are used in automotive catalytic converters.

Correct AnswerverifiedShow Answer

Rates of reaction can be positive or negative.

Correct AnswerverifiedShow Answer

The graph shown below depicts the relationship between concentration and time for the following chemical reaction. The slope of this line is equal to __________.

Correct AnswerverifiedShow Answer

What is the overall order of the reaction?

Correct AnswerverifiedShow Answer

Units of the rate constant of a reaction are independent of the overall reaction order.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A reaction was found to be third order in A. Increasing the concentration of A by a factor of 3 will cause the reaction rate to __________.

Correct AnswerverifiedShow Answer

In the Arrhenius equation, k = Ae-Ea/RT __________ is the frequency factor.

Correct AnswerverifiedShow Answer

How many moles of B are present at 10 s?

Correct AnswerverifiedShow Answer

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The reaction 2NO₂ → 2NO + O₂ Follows second-order kinetics. At 300°C, [NO₂] drops from 0.0100 M to 0.00650 M in 100.0 s. The rate constant for the reaction is __________ M^-1s^-1.

Correct Answer
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Correct Answer
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The rate constant for a second-order reaction is 0.13 M^-1s^-1. If the initial concentration of reactant is 0.26 mol/L, it takes __________ s for the concentration to decrease to 0.11 mol/L.

Correct Answer
verified

The rate of disappearance of HBr in the gas phase reaction 2HBr (g) → H₂ (g) + Br₂ (g) Is 0.301 Ms^-1 at 150°C. The rate of appearance of Br₂ is __________ Ms^-1.

Correct Answer
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At elevated temperatures, methylisonitrile (CH₃NC) isomerizes to acetonitrile (CH₃CN) : CH₃NC (g) → CH₃CN (g) The dependence of the rate constant on temperature is studied and the graph below is prepared from the results. The energy of activation of this reaction is __________ kJ/mol.

Correct Answer
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In the Arrhenius equation, k = Ae^-Ea/RT __________ is the frequency factor.

Correct Answer
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Correct Answer
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