Question 1

Cyclopropane is converted to propene in a first-order process.The rate constant is 5.4  ×	imes×  10-2 hr-1.If the initial concentration of cyclopropane is 0.150 M,what will its concentration be after 22.0 hours?

Accepted Answer

A)  0.0457 M
B)  0.105 M
C)  0.127 M
D)  0.492 M
E)  None of these choices is correct. F) All of the above
G) C) and E)

Question 2

Ammonium cyanate (NH4CNO) reacts to form urea (NH2CONH2) .At 65°C the rate constant,k,is 3.60 L mol-1s-1.What is the rate law for this reaction?

Accepted Answer

A)  Rate = 3.60 L mol-1s-1[NH4CNO]
B)  Rate = 3.60 L mol-1s-1[NH4CNO]2
C)  Rate = 0.28 mol L-1 s-1[NH4CNO]
D)  Rate = 0.28 mol L-1 s-1[NH4CNO]2
E)  Rate = 3.60 L mol-1s-1[NH2CONH2]-1F) D) and E)
G) C) and D)

Question 3

Ammonia will react with oxygen in the presence of a copper catalyst to form nitrogen and water.From 164.5°C to 179.0°C,the rate constant increases by a factor of 4.27.What is the activation energy of this oxidation reaction?

Accepted Answer

A)  24.5 kJ/mol
B)  165 kJ/mol
C)  242 kJ/mol
D)  1630 kJ/mol
E)  > 104 kJ/molF) All of the above
G) A) and D)

Question 4

For the reaction
3A(g) + 2B(g)   →	o→  2C(g) + 2D(g) 
The following data was collected at constant temperature.Determine the correct rate law for this reaction.
2 C) Rate = k[A]3[B]2 D) Rate = k[A]1.5[B] E) Rate = k[A]2[B] " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  Rate = k[A][B]
B)  Rate = k[A][B]2
C)  Rate = k[A]3[B]2
D)  Rate = k[A]1.5[B]
E)  Rate = k[A]2[B] F) B) and E)
G) B) and C)

Question 5

Consider the following reaction
8A(g) + 5B(g)   →	o→  8C(g) + 6D(g) 
If [C] is increasing at the rate of 4.0 mol L-1s-1,at what rate is [B] changing?

Accepted Answer

A)  -0.40 mol L-1s-1
B)  -2.5 mol L-1s-1
C)  -4.0 mol L-1s-1
D)  -6.4 mol L-1s-1
E)  None of these choices is correct,since its rate of change must be positive. F) A) and B)
G) C) and D)

Question 6

The rate constant for a reaction is 4.65 L mol-1s-1.What is the overall order of the reaction?

Accepted Answer

A)  zero
B)  first
C)  second
D)  third
E)  More information is needed to determine the overall order.F) C) and E)
G) A) and B)

Question 7

When a catalyst is added to a reaction mixture,it

Accepted Answer

A)  increases the rate of collisions between reactant molecules.
B)  provides reactant molecules with more energy.
C)  slows down the rate of the back reaction.
D)  provides a new pathway (mechanism) for the reaction.
E)  does none of theseF) None of the above
G) A) and E)

Question 8

A catalyst accelerates a reaction because

Accepted Answer

A)  it increases the number of molecules with energy equal to or greater than the activation energy.
B)  it lowers the activation energy for the reaction.
C)  it increases the number of collisions between molecules.
D)  it increases the temperature of the molecules in the reaction.
E)  it supplies energy to reactant molecules.F) None of the above
G) C) and E)

Question 9

The decomposition of dinitrogen pentaoxide has an activation energy of 102 kJ/mol and  Δ\DeltaΔ H°rxn = + 55 kJ/mol.What is the activation energy for the reverse reaction?

Accepted Answer

A)  27 kJ/mol
B)  47 kJ/mol
C)  55 kJ/mol
D)  102 kJ/mol
E)  More information is needed,since this is a Hess' Law calculation. F) A) and B)
G) A) and C)

Question 10

A transition state is a species (or state)corresponding to an energy maximum on a reaction energy diagram.

Accepted Answer

A) True 
 B)False

Question 11

Dinitrogen tetraoxide,N2O4,decomposes to nitrogen dioxide,NO2,in a first-order process.If k = 2.5  ×	imes×  103 s-1 at -5°C and k = 3.5  ×	imes×  104 s-1 at 25°C,what is the activation energy for the decomposition?

Accepted Answer

A)  0.73 kJ/mol
B)  58 kJ/mol
C)  140 kJ/mol
D)  580 kJ/mol
E)  > 1000 kJ/mol F) C) and D)
G) A) and E)

Question 12

A reaction has an activation energy of 195.0 kJ/mol.When the temperature is increased from 200.°C to 220.°C,the rate constant will increase by a factor of

Accepted Answer

A)  1.1
B)  4.3  ×	imes×  104
C)  3.2
D)  7.5
E)  None of these choices is correct. F) B) and D)
G) A) and E)

Question 13

The reaction CH3NC(g)   →	o→  CH3CN(g) is first-order with respect to methyl isocyanide,CH3NC.If it takes 10.3 minutes for exactly one quarter of the initial amount of methyl isocyanide to react,what is the rate constant in units of min-1?

Accepted Answer

A)  -0.135 min-1
B)  0.0279 min-1
C)  0.089 min-1
D)  0.135 min-1
E)  35.8 min-1 F) A) and B)
G) B) and C)

Question 14

All second-order reactions are bimolecular reactions.

Accepted Answer

A) True 
 B)False

Question 15

Sulfuryl chloride,SO2Cl2(g) ,decomposes at high temperature to form SO2(g) and Cl2(g) .The rate constant at a certain temperature is 4.68  ×	imes×  10-5s-1.What is the order of the reaction?

Accepted Answer

A)  zero
B)  first
C)  second
D)  third
E)  More information is needed to determine the order. F) All of the above
G) C) and D)

Question 16

The radioactive isotope tritium decays with a first-order rate constant k of 0.056 year-1.What fraction of the tritium initially in a sample is still present 30 years later?

Accepted Answer

A)  0.19
B)  0.60
C)  0.15
D)  2.8  ×	imes×  10-38
E)  None of these choices is correct. F) A) and B)
G) A) and C)

Exam 16: Kinetics: Rates and Mechanisms of Chemical Reactions

The rate constant for a reaction is 4.65 L mol^-1s^-1.What is the overall order of the reaction?

Correct Answer
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Correct Answer
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A transition state is a species (or state)corresponding to an energy maximum on a reaction energy diagram.

Correct Answer
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Dinitrogen tetraoxide,N₂O₄,decomposes to nitrogen dioxide,NO₂,in a first-order process.If k = 2.5 $\times$ 10³ s^-1 at -5°C and k = 3.5 $\times$ 10⁴ s^-1 at 25°C,what is the activation energy for the decomposition?

Correct Answer
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Sulfuryl chloride,SO₂Cl₂(g) ,decomposes at high temperature to form SO₂(g) and Cl₂(g) .The rate constant at a certain temperature is 4.68 $\times$ 10^-5s^-1.What is the order of the reaction?

Correct Answer
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Cyclopropane is converted to propene in a first-order process.The rate constant is 5.4 $\times$ 10^-2 hr^-1.If the initial concentration of cyclopropane is 0.150 M,what will its concentration be after 22.0 hours?

Correct Answer
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All second-order reactions are bimolecular reactions.

Correct Answer
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The decomposition of dinitrogen pentaoxide has an activation energy of 102 kJ/mol and $\Delta$ H°_rxn = + 55 kJ/mol.What is the activation energy for the reverse reaction?

Correct Answer
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A reaction has an activation energy of 195.0 kJ/mol.When the temperature is increased from 200.°C to 220.°C,the rate constant will increase by a factor of

Correct Answer
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Ammonium cyanate (NH₄CNO) reacts to form urea (NH₂CONH₂) .At 65°C the rate constant,k,is 3.60 L mol^-1s^-1.What is the rate law for this reaction?

Correct Answer
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Ammonia will react with oxygen in the presence of a copper catalyst to form nitrogen and water.From 164.5°C to 179.0°C,the rate constant increases by a factor of 4.27.What is the activation energy of this oxidation reaction?

Correct Answer
verified

When a catalyst is added to a reaction mixture,it

Correct Answer
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The radioactive isotope tritium decays with a first-order rate constant k of 0.056 year^-1.What fraction of the tritium initially in a sample is still present 30 years later?

Correct Answer
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Consider the following reaction 8A(g) + 5B(g) $\to$ 8C(g) + 6D(g) If [C] is increasing at the rate of 4.0 mol L^-1s^-1,at what rate is [B] changing?

Correct Answer
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A catalyst accelerates a reaction because

Correct Answer
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The reaction CH₃NC(g) $\to$ CH₃CN(g) is first-order with respect to methyl isocyanide,CH₃NC.If it takes 10.3 minutes for exactly one quarter of the initial amount of methyl isocyanide to react,what is the rate constant in units of min^-1?

Correct Answer
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Exam 16: Kinetics: Rates and Mechanisms of Chemical Reactions

The rate constant for a reaction is 4.65 L mol-1s-1.What is the overall order of the reaction?

Correct AnswerverifiedShow Answer

For the reaction 3A(g) + 2B(g) →\to→ 2C(g) + 2D(g) The following data was collected at constant temperature.Determine the correct rate law for this reaction.

Correct AnswerverifiedShow Answer

A transition state is a species (or state)corresponding to an energy maximum on a reaction energy diagram.

Correct AnswerverifiedShow Answer

Dinitrogen tetraoxide,N2O4,decomposes to nitrogen dioxide,NO2,in a first-order process.If k = 2.5 ×\times× 103 s-1 at -5°C and k = 3.5 ×\times× 104 s-1 at 25°C,what is the activation energy for the decomposition?

Correct AnswerverifiedShow Answer

Sulfuryl chloride,SO2Cl2(g) ,decomposes at high temperature to form SO2(g) and Cl2(g) .The rate constant at a certain temperature is 4.68 ×\times× 10-5s-1.What is the order of the reaction?

Correct AnswerverifiedShow Answer

Cyclopropane is converted to propene in a first-order process.The rate constant is 5.4 ×\times× 10-2 hr-1.If the initial concentration of cyclopropane is 0.150 M,what will its concentration be after 22.0 hours?

Correct AnswerverifiedShow Answer

All second-order reactions are bimolecular reactions.

Correct AnswerverifiedShow Answer

The decomposition of dinitrogen pentaoxide has an activation energy of 102 kJ/mol and Δ\DeltaΔ H°rxn = + 55 kJ/mol.What is the activation energy for the reverse reaction?

Correct AnswerverifiedShow Answer

A reaction has an activation energy of 195.0 kJ/mol.When the temperature is increased from 200.°C to 220.°C,the rate constant will increase by a factor of

Correct AnswerverifiedShow Answer

Ammonium cyanate (NH4CNO) reacts to form urea (NH2CONH2) .At 65°C the rate constant,k,is 3.60 L mol-1s-1.What is the rate law for this reaction?

Correct AnswerverifiedShow Answer

Ammonia will react with oxygen in the presence of a copper catalyst to form nitrogen and water.From 164.5°C to 179.0°C,the rate constant increases by a factor of 4.27.What is the activation energy of this oxidation reaction?

Correct AnswerverifiedShow Answer

When a catalyst is added to a reaction mixture,it

Correct AnswerverifiedShow Answer

The radioactive isotope tritium decays with a first-order rate constant k of 0.056 year-1.What fraction of the tritium initially in a sample is still present 30 years later?

Correct AnswerverifiedShow Answer

Consider the following reaction 8A(g) + 5B(g) →\to→ 8C(g) + 6D(g) If [C] is increasing at the rate of 4.0 mol L-1s-1,at what rate is [B] changing?

Correct AnswerverifiedShow Answer

A catalyst accelerates a reaction because

Correct AnswerverifiedShow Answer

The reaction CH3NC(g) →\to→ CH3CN(g) is first-order with respect to methyl isocyanide,CH3NC.If it takes 10.3 minutes for exactly one quarter of the initial amount of methyl isocyanide to react,what is the rate constant in units of min-1?

Correct AnswerverifiedShow Answer

The rate constant for a reaction is 4.65 L mol^-1s^-1.What is the overall order of the reaction?

Correct Answer
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Correct Answer
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Correct Answer
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Dinitrogen tetraoxide,N₂O₄,decomposes to nitrogen dioxide,NO₂,in a first-order process.If k = 2.5 $\times$ 10³ s^-1 at -5°C and k = 3.5 $\times$ 10⁴ s^-1 at 25°C,what is the activation energy for the decomposition?

Correct Answer
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Sulfuryl chloride,SO₂Cl₂(g) ,decomposes at high temperature to form SO₂(g) and Cl₂(g) .The rate constant at a certain temperature is 4.68 $\times$ 10^-5s^-1.What is the order of the reaction?

Correct Answer
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Cyclopropane is converted to propene in a first-order process.The rate constant is 5.4 $\times$ 10^-2 hr^-1.If the initial concentration of cyclopropane is 0.150 M,what will its concentration be after 22.0 hours?

Correct Answer
verified

Correct Answer
verified

The decomposition of dinitrogen pentaoxide has an activation energy of 102 kJ/mol and $\Delta$ H°_rxn = + 55 kJ/mol.What is the activation energy for the reverse reaction?

Correct Answer
verified

Correct Answer
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Ammonium cyanate (NH₄CNO) reacts to form urea (NH₂CONH₂) .At 65°C the rate constant,k,is 3.60 L mol^-1s^-1.What is the rate law for this reaction?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The radioactive isotope tritium decays with a first-order rate constant k of 0.056 year^-1.What fraction of the tritium initially in a sample is still present 30 years later?

Correct Answer
verified

Consider the following reaction 8A(g) + 5B(g) $\to$ 8C(g) + 6D(g) If [C] is increasing at the rate of 4.0 mol L^-1s^-1,at what rate is [B] changing?

Correct Answer
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Correct Answer
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The reaction CH₃NC(g) $\to$ CH₃CN(g) is first-order with respect to methyl isocyanide,CH₃NC.If it takes 10.3 minutes for exactly one quarter of the initial amount of methyl isocyanide to react,what is the rate constant in units of min^-1?

Correct Answer
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