Question 1

The rate of a reaction is determined by the rate of the fastest step in the mechanism.

Accepted Answer

A) True 
 B)False

Question 2

A reactant R is being consumed in a first-order reaction. What fraction of the initial R is consumed in 4.0 half-lives?

Accepted Answer

A)   0.94
B)   0.87
C)   0.75
D)   0.13
E)   0.063F) B) and E)
G) C) and E)

Question 3

In going from room temperature (25.0  °\degree° C)  to 10  °\degree° C above room temperature, the rate of a reaction doubles. Calculate the activation energy for the reaction.

Accepted Answer

A)   157.2 kJ/mol
B)   103.8 kJ/mol
C)   52.9 kJ/mol
D)   6.4 kJ/mol
E)   <1 kJ/mol F) C) and D)
G) A) and D)

Question 4

Consider this reaction: 
2NH3(g)   →\rightarrow→ N2(g)  + 3H2(g)  If the rate  Δ\DeltaΔ [H2]/ Δ\DeltaΔ t is 0.030 mol L¯1 s¯1, then  Δ\DeltaΔ [NH3]/ Δ\DeltaΔ t is:

Accepted Answer

A)   -0.045 mol L¯1 s¯1
B)   -0.030 mol L¯1 s¯1
C)   -0.020 mol L¯1 s¯1
D)   -0.010 mol L¯1 s¯1
E)   None of these choices is correct. F) A) and E)
G) All of the above

Question 5

Consider the general reaction: 
5Br¯(aq)  + BrO3¯(aq)  + 6H+(aq)   →\rightarrow→  3Br2(aq)  + 3H2O(aq) 
For this reaction, the rate when expressed as  Δ\DeltaΔ [Br2]/ Δ\DeltaΔ t is the same as:

Accepted Answer

A)   - Δ\DeltaΔ [H2O]/ Δ\DeltaΔ t
B)   3 Δ\DeltaΔ [BrO3¯]/ Δ\DeltaΔ t
C)   -5 Δ\DeltaΔ [Br¯]/ Δ\DeltaΔ t
D)   -0.6 Δ\DeltaΔ [Br¯]/ Δ\DeltaΔ t
E)   None of these choices is correct. F) C) and E)
G) A) and E)

Question 6

The units of the rate of reaction depend on the order of the reaction.

Accepted Answer

A) True 
 B)False

Question 7

The decomposition of dinitrogen pentaoxide has an activation energy of 102 kJ/mol and  Δ\DeltaΔ H °\degree° 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's law calculation. F) A) and D)
G) All of the above

Question 8

Which one of the following sets of units is appropriate for a second-order rate constant?

Accepted Answer

A)   s¯1
B)   mol L¯1 s¯1
C)   L mol¯1 s¯1
D)   mol2 L¯2 s¯1
E)   L2 mol¯2 s¯1F) B) and C)
G) A) and D)

Question 9

Briefly list the features/properties common to all catalysts and how they work. Draw a labeled reaction energy diagram as part of your answer.

Accepted Answer

Catalysts speed up a reaction ...

Question 10

A reaction is second-order with respect to the reactant R. Which of the following plots will produce a straight line?

Accepted Answer

A)   [R] vs. 1/time
B)   1/[R] vs. time
C)   [R]2 vs. time
D)   1/[R]2 vs. time
E)   ln[R] vs. timeF) A) and E)
G) A) and B)

Question 11

The greater the energy of activation, Ea, the faster will be the reaction.

Accepted Answer

A) True 
 B)False

Question 12

Ammonium cyanate (NH4CNO)  reacts to form urea (NH2CONH2) . At 65  °\degree° 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¯1s¯1[NH4CNO]
D)   Rate = 0.28 mol L¯1s¯1[NH4CNO]2
E)   Rate = 3.60 L mol¯1s¯1[NH2CONH2]¯1 F) A) and B)
G) A) and E)

Question 13

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 *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) B) and C)
G) B) and D)

Question 14

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

Accepted Answer

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

Question 15

The kinetics of the decomposition of dinitrogen pentaoxide is studied at 50  °\degree° C and at 75  °\degree° C. Which of the following statements concerning the studies is correct?

Accepted Answer

A)   The rate at 75  °\degree° C will be greater than the rate at 50  °\degree° C because the activation energy will be lower at 75  °\degree° C than at 50  °\degree° C.
B)   The rate at 75  °\degree° C will be greater than the rate at 50  °\degree° C because the activation energy will be higher at 75  °\degree° C than at 50  °\degree° C.
C)   The rate at 75  °\degree° C will be less than the rate at 50  °\degree° C because the molecules at higher speeds do not interact as well as those at lower speeds.
D)   The rate at 75  °\degree° C will be greater than at 50  °\degree° C because the concentration of a gas increases with increasing temperature.
E)   The rate at 75  °\degree° C will be greater than the rate at 50  °\degree° C because the number of molecules with enough energy to react increases with increasing temperature. F) A) and C)
G) D) and E)

Question 16

A boiled egg can be cooked at 100.0  °\degree° C in exactly 5 minutes. At an altitude of around 2000 m where the boiling point of water is 93.0  °\degree° C, it takes exactly 7.5 minutes to cook the egg to the same amount. What is the activation energy for the reaction involved when an egg is boiled?

Accepted Answer

A)   0.5 kJ/mol
B)   4.5 kJ/mol
C)   7.9 kJ/mol
D)   66 kJ/mol
E)   >100 kJ/mol F) B) and E)
G) A) and D)

Question 17

The gas-phase conversion of 1,3-butadiene to 1,5-cyclooctadiene, 2C4H6 $\rightarrow$C8H12, was studied, providing data for the plot shown in the graph, of 1/[butadiene] versus time.
A) Explain how this plot confirms that the reaction is second order.
B) Calculate the second-order rate constant, k.
C) Determine the initial concentration of 1,3-butadiene in this experiment.

Accepted Answer

a. The fact that a plot of 1/[...

Question 18

Chlorine atoms act as heterogeneous catalysts in the destruction of ozone in the stratosphere.

Accepted Answer

A) True 
 B)False

Question 19

For the reaction 3A(g)  + 2B(g)   →\rightarrow→ 2C(g)  + 2D(g) , the following data were 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 C)
G) A) and D)

Question 20

The decomposition of SOCl2 is first-order in SOCl2. If the half-life for the reaction is 4.1 hr, how long would it take for the concentration of SOCl2 to drop from 0.36 M to 0.045 M?

Accepted Answer

A)   0.52 hr
B)   1.4 hr
C)   12 hr
D)   33 hr
E)   > 40 hrF) A) and D)
G) A) and C)

Exam 16: Kinetics: Rates and Mechanisms of Chemical Reactions

The units of the rate of reaction depend on the order of the reaction.

Correct Answer
verified

Consider this reaction: 2NH₃(g) $\rightarrow$ N₂(g) + 3H₂(g) If the rate $\Delta$ [H₂]/ $\Delta$ t is 0.030 mol L¯¹ s¯¹, then $\Delta$ [NH₃]/ $\Delta$ t is:

Correct Answer
verified

In going from room temperature (25.0 $\degree$ C) to 10 $\degree$ C above room temperature, the rate of a reaction doubles. Calculate the activation energy for the reaction.

Correct Answer
verified

The kinetics of the decomposition of dinitrogen pentaoxide is studied at 50 $\degree$ C and at 75 $\degree$ C. Which of the following statements concerning the studies is correct?

Correct Answer
verified

A reactant R is being consumed in a first-order reaction. What fraction of the initial R is consumed in 4.0 half-lives?

Correct Answer
verified

A boiled egg can be cooked at 100.0 $\degree$ C in exactly 5 minutes. At an altitude of around 2000 m where the boiling point of water is 93.0 $\degree$ C, it takes exactly 7.5 minutes to cook the egg to the same amount. What is the activation energy for the reaction involved when an egg is boiled?

Correct Answer
verified

Which one of the following sets of units is appropriate for a second-order rate constant?

Correct Answer
verified

Briefly list the features/properties common to all catalysts and how they work. Draw a labeled reaction energy diagram as part of your answer.

Correct Answer
verified
Catalysts speed up a reaction ...
View Answer

Ammonium cyanate (NH₄CNO) reacts to form urea (NH₂CONH₂) . At 65 $\degree$ 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

Chlorine atoms act as heterogeneous catalysts in the destruction of ozone in the stratosphere.

Correct Answer
verified

The rate of a reaction is determined by the rate of the fastest step in the mechanism.

Correct Answer
verified

A reaction is second-order with respect to the reactant R. Which of the following plots will produce a straight line?

Correct Answer
verified

Correct Answer
verified
a. The fact that a plot of 1/[...
View Answer

The greater the energy of activation, E_a, the faster will be the reaction.

Correct Answer
verified

The decomposition of SOCl₂ is first-order in SOCl₂. If the half-life for the reaction is 4.1 hr, how long would it take for the concentration of SOCl₂ to drop from 0.36 M to 0.045 M?

Correct Answer
verified

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 *10¯⁵s¯¹. What is the order of the reaction?

Correct Answer
verified

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

Correct Answer
verified

Consider the general reaction: 5Br¯(aq) + BrO₃¯(aq) + 6H⁺(aq) $\rightarrow$ 3Br₂(aq) + 3H₂O(aq) For this reaction, the rate when expressed as $\Delta$ [Br₂]/ $\Delta$ t is the same as:

Correct Answer
verified

Exam 16: Kinetics: Rates and Mechanisms of Chemical Reactions

The units of the rate of reaction depend on the order of the reaction.

Correct AnswerverifiedShow Answer

Consider this reaction: 2NH3(g) →\rightarrow→ N2(g) + 3H2(g) If the rate Δ\DeltaΔ [H2]/ Δ\DeltaΔ t is 0.030 mol L¯1 s¯1, then Δ\DeltaΔ [NH3]/ Δ\DeltaΔ t is:

Correct AnswerverifiedShow Answer

In going from room temperature (25.0 °\degree° C) to 10 °\degree° C above room temperature, the rate of a reaction doubles. Calculate the activation energy for the reaction.

Correct AnswerverifiedShow Answer

The kinetics of the decomposition of dinitrogen pentaoxide is studied at 50 °\degree° C and at 75 °\degree° C. Which of the following statements concerning the studies is correct?

Correct AnswerverifiedShow Answer

A reactant R is being consumed in a first-order reaction. What fraction of the initial R is consumed in 4.0 half-lives?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which one of the following sets of units is appropriate for a second-order rate constant?

Correct AnswerverifiedShow Answer

Briefly list the features/properties common to all catalysts and how they work. Draw a labeled reaction energy diagram as part of your answer.

Correct AnswerverifiedCatalysts speed up a reaction ...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

For the reaction A(g) + 2B(g) →\rightarrow→ 2C(g) + 2D(g) , the following data were collected at constant temperature. Determine the correct rate law for this reaction.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Chlorine atoms act as heterogeneous catalysts in the destruction of ozone in the stratosphere.

Correct AnswerverifiedShow Answer

The rate of a reaction is determined by the rate of the fastest step in the mechanism.

Correct AnswerverifiedShow Answer

A reaction is second-order with respect to the reactant R. Which of the following plots will produce a straight line?

Correct AnswerverifiedShow Answer

Correct Answerverifieda. The fact that a plot of 1/[...View AnswerShow Answer

The greater the energy of activation, Ea, the faster will be the reaction.

Correct AnswerverifiedShow Answer

The decomposition of SOCl2 is first-order in SOCl2. If the half-life for the reaction is 4.1 hr, how long would it take for the concentration of SOCl2 to drop from 0.36 M to 0.045 M?

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 *10¯5s¯1. What is the order of the reaction?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Consider the general reaction: 5Br¯(aq) + BrO3¯(aq) + 6H+(aq) →\rightarrow→ 3Br2(aq) + 3H2O(aq) For this reaction, the rate when expressed as Δ\DeltaΔ [Br2]/ Δ\DeltaΔ t is the same as:

Correct AnswerverifiedShow Answer

Correct Answer
verified

Consider this reaction: 2NH₃(g) $\rightarrow$ N₂(g) + 3H₂(g) If the rate $\Delta$ [H₂]/ $\Delta$ t is 0.030 mol L¯¹ s¯¹, then $\Delta$ [NH₃]/ $\Delta$ t is:

Correct Answer
verified

In going from room temperature (25.0 $\degree$ C) to 10 $\degree$ C above room temperature, the rate of a reaction doubles. Calculate the activation energy for the reaction.

Correct Answer
verified

The kinetics of the decomposition of dinitrogen pentaoxide is studied at 50 $\degree$ C and at 75 $\degree$ C. Which of the following statements concerning the studies is correct?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Catalysts speed up a reaction ...
View Answer

Ammonium cyanate (NH₄CNO) reacts to form urea (NH₂CONH₂) . At 65 $\degree$ 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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
a. The fact that a plot of 1/[...
View Answer

The greater the energy of activation, E_a, the faster will be the reaction.

Correct Answer
verified

The decomposition of SOCl₂ is first-order in SOCl₂. If the half-life for the reaction is 4.1 hr, how long would it take for the concentration of SOCl₂ to drop from 0.36 M to 0.045 M?

Correct Answer
verified

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 *10¯⁵s¯¹. What is the order of the reaction?

Correct Answer
verified

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

Correct Answer
verified

Consider the general reaction: 5Br¯(aq) + BrO₃¯(aq) + 6H⁺(aq) $\rightarrow$ 3Br₂(aq) + 3H₂O(aq) For this reaction, the rate when expressed as $\Delta$ [Br₂]/ $\Delta$ t is the same as:

Correct Answer
verified