Question 1

If the activation energy for a given compound is found to be 103 kJ/mol,with a frequency factor of
4.0 × 1013 s-1,what is the rate constant for this reaction at 398 K?

Accepted Answer

A) 1.2 s-1 
B) 8.2 s-1 
C) 3.9 × 1010 s-1 
D) 1.7 × 1010 s-1 
E) 2.5 × 107 s-1 
A) 1.2 s-1 
B) 8.2 s-1 
C) 3.9 × 1010 s-1 
D) 1.7 × 1010 s-1 
E) 2.5 × 107 s-1

Question 2

How many half-lives are required for the concentration of reactant to decrease to 25% of its original value?

Accepted Answer

A) 1 
B) 3 
C) 1.5 
D) 2.5 
E) 2 
A) 1 
B) 3 
C) 1.5 
D) 2.5 
E) 2

Question 3

The decomposition of N2O5 in solution in carbon tetrachloride proceeds via the reaction
2N2O5 (soln)→ 4NO2 (soln)+ O2 (soln)
The reaction is first order and has a rate constant of 4.82 × 10-3 s-1 at 64°C.If the reaction is initiated with 0.058 mol in a 1.00-L vessel,how many moles remain after 151 s?

Accepted Answer

A) 0.055 M 
B) 0.060 M 
C) 0.028 M 
D) 12 M 
E) 2.0 × 103 M 
A) 0.055 M 
B) 0.060 M 
C) 0.028 M 
D) 12 M 
E) 2.0 × 103 M

Question 4

Write a balanced reaction for which the following rate relationships are true.
Rate = -   =    =

Accepted Answer

A) 2 N2O5 → 4 NO2 + O2 
B) 4 NO2 + O2 → 2 N2O5 
C) 2 N2O5 → NO2 + 4 O2 
D)   NO2 + O2 → N2O5 
E)   N2O5 →     NO2 + O2 
A) 2 N2O5 → 4 NO2 + O2 
B) 4 NO2 + O2 → 2 N2O5 
C) 2 N2O5 → NO2 + 4 O2 
D)   NO2 + O2 → N2O5 
E)   N2O5 →     NO2 + O2

Question 5

SO2Cl2 decomposes in the gas phase by the reaction
SO2Cl2(g)→ SO2(g)+ Cl2(g)
The reaction is first order in SO2Cl2 and the rate constant is 3.0 × 10-6 s-1at 600 K.A vessel is charged with 2.4 atm of SO2Cl2 at 600 K.The partial pressure of SO2Cl2 at 3.0 × 105 s is ________ atm.

Accepted Answer

A) 0.76 
B) 2.2 
C) 0.98 
D) 0.29 
E) 1.4 × 105  
A) 0.76 
B) 2.2 
C) 0.98 
D) 0.29 
E) 1.4 × 105

Question 6

Given the following balanced equation,determine the rate of reaction with respect to [O2].If the rate of formation of O2 is 6.94 × 10-1 M/s,what is the rate of the loss of O3?
2 O3(g)→ 3 O2(g)

Accepted Answer

A) 0.463 M/s 
B) 1.04 M/s 
C) 2.08 M/s 
D) 0.231 M/s 
E) 4.16 M/s 
A) 0.463 M/s 
B) 1.04 M/s 
C) 2.08 M/s 
D) 0.231 M/s 
E) 4.16 M/s

Question 7

Identify an homogeneous catalyst.

Accepted Answer

A) SO2 over vanadium (V)oxide 
B) Pd in H2 gas 
C) Pt with methane 
D) H2SO4 with concentrated HCl 
E) N2 and H2 catalyzed by Fe 
A) SO2 over vanadium (V)oxide 
B) Pd in H2 gas 
C) Pt with methane 
D) H2SO4 with concentrated HCl 
E) N2 and H2 catalyzed by Fe

Question 8

What function do enzymes serve?

Accepted Answer

Enzymes are biological catalysts.They lo

Question 9

Define half-life.

Accepted Answer

Half-life is the time required

Question 10

For the first-order reaction,2 N2O(g)→ 2 N2(g)+ O2(g),what is the concentration of N2O after 3 half-lives if 0.25 mol of N2O is initially placed into a 1.00-L reaction vessel?

Accepted Answer

A) 1.6 × 10-2 M 
B) 3.1 × 10-2 M 
C) 6.2 × 10-2 M 
D) 1.2 × 10-1 M 
A) 1.6 × 10-2 M 
B) 3.1 × 10-2 M 
C) 6.2 × 10-2 M 
D) 1.2 × 10-1 M

Question 11

Which of the following represents the equation for a first-order half-life?

Accepted Answer

A) t 1/2 =   
B) t 1/2 =   
C) t 1/2 =   
D) t 1/2 =   
E) t 1/2 =   
A) t 1/2 =   
B) t 1/2 =   
C) t 1/2 =   
D) t 1/2 =   
E) t 1/2 =

Question 12

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 12% of its initial concentration?

Accepted Answer

A) 0.62 s 
B) 2.8 s 
C) 6.3 s 
D) 8.4 s 
A) 0.62 s 
B) 2.8 s 
C) 6.3 s 
D) 8.4 s

Question 13

What data should be plotted to show that experimental concentration data fits a zeroth-order reaction?

Accepted Answer

A) ln[reactant] vs.time 
B) 1/[reactant] vs.time 
C) ln(k)vs.1/T 
D) ln(k)vs.Ea 
E) [reactant] vs.time 
A) ln[reactant] vs.time 
B) 1/[reactant] vs.time 
C) ln(k)vs.1/T 
D) ln(k)vs.Ea 
E) [reactant] vs.time

Question 14

The isomerization of methylisonitrile to acetonitrile
CH3NC(g)→ CH3CN(g)
Is first order in CH3NC.The half-life of the reaction is 5.20 × 101 s at 545 K.The rate constant when the initial [CH3NC] is 0.030 M is ________ s-1.

Accepted Answer

A) 75.1 
B) 0.641 
C) 0.0133 
D) 1.56 
E) 2.84 × 104 
A) 75.1 
B) 0.641 
C) 0.0133 
D) 1.56 
E) 2.84 × 104

Question 15

A reaction follows the following two-step mechanism.
2A → A2 Slow
A2 + B → A2B Fast
Overall: 2A + B = A2B
What is the rate law?

Accepted Answer

A) Rate = k[A]2 
B) Rate = k[A]2[B] 
C) Rate = k[A][B] 
D) Rate = k[A2][B] 
A) Rate = k[A]2 
B) Rate = k[A]2[B] 
C) Rate = k[A][B] 
D) Rate = k[A2][B]

Question 16

The combustion of ethylene proceeds by the reaction
C2H4(g)+ 3O2(g)→ 2CO2(g)+ 2H2O(g)
When the rate of disappearance of O2 is 0.28 M s-1,the rate of appearance of CO2 is ________ M s-1.

Accepted Answer

A) 0.19 
B) 0.093 
C) 0.84 
D) 0.42 
E) 0.56 
A) 0.19 
B) 0.093 
C) 0.84 
D) 0.42 
E) 0.56

Question 17

Which of the following represents the equation for a second-order half-life?

Accepted Answer

A) t 1/2 =   
B) t 1/2 =   
C) t 1/2 =   
D) t 1/2 =   
E) t 1/2 =   
A) t 1/2 =   
B) t 1/2 =   
C) t 1/2 =   
D) t 1/2 =   
E) t 1/2 =

Question 18

The first-order reaction,SO2Cl2 → SO2 + Cl2,has a half-life of 8.75 hours at 593 K.How long will it take for the concentration of SO2Cl2 to fall to 16.5% of its initial value?

Accepted Answer

A) 0.143 hr 
B) 2.28 hr 
C) 6.99 hr 
D) 22.7 hr 
A) 0.143 hr 
B) 2.28 hr 
C) 6.99 hr 
D) 22.7 hr

Question 19

The rate constant for a second-order reaction is 0.54 M-1s-1.What is the half-life of this reaction if the initial concentration is 0.27 M?

Accepted Answer

A) 2.0 s 
B) 5.0 s 
C) 1.7 s 
D) 6.9 s 
E) 1.3 s 
A) 2.0 s 
B) 5.0 s 
C) 1.7 s 
D) 6.9 s 
E) 1.3 s

Question 20

The decomposition of dinitrogen pentoxide is described by the chemical equation:
2 N2O5(g)→ 4 NO2(g)+ O2(g)
If the rate of disappearance of N2O5 is equal to 1.60 mol/min at a particular moment,what is the rate of appearance of NO2 at that moment?

Accepted Answer

A) 0.800 mol/min 
B) 1.60 mol/min 
C) 3.20 mol/min 
D) 6.40 mol/min 
A) 0.800 mol/min 
B) 1.60 mol/min 
C) 3.20 mol/min 
D) 6.40 mol/min

If the activation energy for a given compound is found to be 103 kJ/mol,with a frequency factor of 4.0 × 10¹³ s^-1,what is the rate constant for this reaction at 398 K?

How many half-lives are required for the concentration of reactant to decrease to 25% of its original value?

Write a balanced reaction for which the following rate relationships are true. Rate = - = =

Given the following balanced equation,determine the rate of reaction with respect to [O₂].If the rate of formation of O₂ is 6.94 × 10^-1 M/s,what is the rate of the loss of O₃? 2 O₃(g)→ 3 O₂(g)

Identify an homogeneous catalyst.

What function do enzymes serve?

Define half-life.

For the first-order reaction,2 N₂O(g)→ 2 N₂(g)+ O₂(g),what is the concentration of N₂O after 3 half-lives if 0.25 mol of N₂O is initially placed into a 1.00-L reaction vessel?

Which of the following represents the equation for a first-order half-life?

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 12% of its initial concentration?

What data should be plotted to show that experimental concentration data fits a zeroth-order reaction?

The isomerization of methylisonitrile to acetonitrile CH₃NC(g)→ CH₃CN(g) Is first order in CH₃NC.The half-life of the reaction is 5.20 × 10¹ s at 545 K.The rate constant when the initial [CH₃NC] is 0.030 M is ________ s^-1.

A reaction follows the following two-step mechanism. 2A → A₂Slow A₂+ B → A₂B Fast Overall: 2A + B = A₂B What is the rate law?

The combustion of ethylene proceeds by the reaction C₂H₄(g)+ 3O₂(g)→ 2CO₂(g)+ 2H₂O(g) When the rate of disappearance of O₂ is 0.28 M s^-1,the rate of appearance of CO₂ is ________ M s^-1.

Which of the following represents the equation for a second-order half-life?

The first-order reaction,SO₂Cl₂ → SO₂ + Cl₂,has a half-life of 8.75 hours at 593 K.How long will it take for the concentration of SO₂Cl₂ to fall to 16.5% of its initial value?

The rate constant for a second-order reaction is 0.54 M^-1s^-1.What is the half-life of this reaction if the initial concentration is 0.27 M?

The decomposition of dinitrogen pentoxide is described by the chemical equation: 2 N₂O₅(g)→ 4 NO₂(g)+ O₂(g) If the rate of disappearance of N₂O₅ is equal to 1.60 mol/min at a particular moment,what is the rate of appearance of NO₂ at that moment?

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Exam 13: Chemical Kinetics

If the activation energy for a given compound is found to be 103 kJ/mol,with a frequency factor of 4.0 × 1013 s-1,what is the rate constant for this reaction at 398 K?

How many half-lives are required for the concentration of reactant to decrease to 25% of its original value?

Write a balanced reaction for which the following rate relationships are true. Rate = - = =

SO2Cl2 decomposes in the gas phase by the reaction SO2Cl2(g)→ SO2(g)+ Cl2(g) The reaction is first order in SO2Cl2 and the rate constant is 3.0 × 10-6 s-1at 600 K.A vessel is charged with 2.4 atm of SO2Cl2 at 600 K.The partial pressure of SO2Cl2 at 3.0 × 105 s is ________ atm.

Given the following balanced equation,determine the rate of reaction with respect to [O2].If the rate of formation of O2 is 6.94 × 10-1 M/s,what is the rate of the loss of O3? 2 O3(g)→ 3 O2(g)

Identify an homogeneous catalyst.

What function do enzymes serve?

Define half-life.

For the first-order reaction,2 N2O(g)→ 2 N2(g)+ O2(g),what is the concentration of N2O after 3 half-lives if 0.25 mol of N2O is initially placed into a 1.00-L reaction vessel?

Which of the following represents the equation for a first-order half-life?

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 12% of its initial concentration?

What data should be plotted to show that experimental concentration data fits a zeroth-order reaction?

The isomerization of methylisonitrile to acetonitrile CH3NC(g)→ CH3CN(g) Is first order in CH3NC.The half-life of the reaction is 5.20 × 101 s at 545 K.The rate constant when the initial [CH3NC] is 0.030 M is ________ s-1.

A reaction follows the following two-step mechanism. 2A → A2 Slow A2 + B → A2B Fast Overall: 2A + B = A2B What is the rate law?

The combustion of ethylene proceeds by the reaction C2H4(g)+ 3O2(g)→ 2CO2(g)+ 2H2O(g) When the rate of disappearance of O2 is 0.28 M s-1,the rate of appearance of CO2 is ________ M s-1.

Which of the following represents the equation for a second-order half-life?

The first-order reaction,SO2Cl2 → SO2 + Cl2,has a half-life of 8.75 hours at 593 K.How long will it take for the concentration of SO2Cl2 to fall to 16.5% of its initial value?

The rate constant for a second-order reaction is 0.54 M-1s-1.What is the half-life of this reaction if the initial concentration is 0.27 M?

The decomposition of dinitrogen pentoxide is described by the chemical equation: 2 N2O5(g)→ 4 NO2(g)+ O2(g) If the rate of disappearance of N2O5 is equal to 1.60 mol/min at a particular moment,what is the rate of appearance of NO2 at that moment?

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Thermochemistry

The Quantum-Mechanical Model of the Atom

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Chemical Bonding I: Lewis Theory

Chemical Bonding II: Molecular Shapes, Valence Bond Theory, and

Liquids, Solids, and Intermolecular Forces

Solutions

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

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If the activation energy for a given compound is found to be 103 kJ/mol,with a frequency factor of 4.0 × 10¹³ s^-1,what is the rate constant for this reaction at 398 K?

Given the following balanced equation,determine the rate of reaction with respect to [O₂].If the rate of formation of O₂ is 6.94 × 10^-1 M/s,what is the rate of the loss of O₃? 2 O₃(g)→ 3 O₂(g)

For the first-order reaction,2 N₂O(g)→ 2 N₂(g)+ O₂(g),what is the concentration of N₂O after 3 half-lives if 0.25 mol of N₂O is initially placed into a 1.00-L reaction vessel?

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 12% of its initial concentration?

The isomerization of methylisonitrile to acetonitrile CH₃NC(g)→ CH₃CN(g) Is first order in CH₃NC.The half-life of the reaction is 5.20 × 10¹ s at 545 K.The rate constant when the initial [CH₃NC] is 0.030 M is ________ s^-1.

A reaction follows the following two-step mechanism. 2A → A₂Slow A₂+ B → A₂B Fast Overall: 2A + B = A₂B What is the rate law?

The combustion of ethylene proceeds by the reaction C₂H₄(g)+ 3O₂(g)→ 2CO₂(g)+ 2H₂O(g) When the rate of disappearance of O₂ is 0.28 M s^-1,the rate of appearance of CO₂ is ________ M s^-1.

The first-order reaction,SO₂Cl₂ → SO₂ + Cl₂,has a half-life of 8.75 hours at 593 K.How long will it take for the concentration of SO₂Cl₂ to fall to 16.5% of its initial value?

The rate constant for a second-order reaction is 0.54 M^-1s^-1.What is the half-life of this reaction if the initial concentration is 0.27 M?

The decomposition of dinitrogen pentoxide is described by the chemical equation: 2 N₂O₅(g)→ 4 NO₂(g)+ O₂(g) If the rate of disappearance of N₂O₅ is equal to 1.60 mol/min at a particular moment,what is the rate of appearance of NO₂ at that moment?