Question 1

Rates of reaction can be positive or negative.

Accepted Answer

A) True 
 B)False  False

Question 2

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

Accepted Answer

A) True 
 B)False  False

Question 3

A second-order reaction has a half-life of 18 s when the initial concentration of reactant is 0.71 M. The rate constant for this reaction is ________ M-1s-1.

Accepted Answer

A) 7.8 × 10-2 
B) 3.8 × 10-2 
C) 2.0 × 10-2 
D) 1.3 
E) 18 
A) 7.8 × 10-2 
B) 3.8 × 10-2 
C) 2.0 × 10-2 
D) 1.3 
E) 18 A

Question 4

The rate of disappearance of HBr in the gas phase reaction 2HBr (g) → H2 (g)+ Br2 (g)
Is 0.140 M s-1 at 150 °C. The rate of reaction is ________ M s-1.

Accepted Answer

A) 3.57 
B) 0.0700 
C) 0.0196 
D) 0.280 
E) 0.0860 
A) 3.57 
B) 0.0700 
C) 0.0196 
D) 0.280 
E) 0.0860

Question 5

At elevated temperatures, methylisonitrile (CH3NC)isomerizes to acetonitrile (CH3CN): CH3NC (g) → CH3CN (g)
At the start of an experiment, there are 0.200 mol of reactant and 0 mol of product in the reaction vessel. After 25 min, 0.121 mol of reactant (CH3NC)remain. There are ________ mol of product (CH3CN)in the reaction vessel.

Accepted Answer

A) 0.022 
B) 0.121 
C) 0.200 
D) 0.321 
E) 0.079 
A) 0.022 
B) 0.121 
C) 0.200 
D) 0.321 
E) 0.079

Question 6

In a linear graphical representation of a zero-order reaction, what value is represented by the y-intercept of the line drawn from plotting [A] vs. time?

Accepted Answer

A) [A]0 
B) ln[A]0 
C) 1/[A]0 
D) [A]02 
E) [A]/k 
A) [A]0 
B) ln[A]0 
C) 1/[A]0 
D) [A]02 
E) [A]/k

Question 7

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

Question 8

The data in the table below were obtained for the reaction:
A + B → P  
-The overall order of the reaction is ________.

Accepted Answer

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

Question 9

The concentration of reactants or products at any time during the reaction can be calculated from the integrated rate law.

Accepted Answer

A) True 
 B)False

Question 10

The enzyme nitrogenase converts ________ into ________.

Accepted Answer

A) ammonia, urea 
B) CO and unburned hydrocarbons, H2O and CO2 
C) nitrogen, ammonia 
D) nitrogen oxides, N2 and O2 
E) nitroglycerine, nitric acid, and glycerine 
A) ammonia, urea 
B) CO and unburned hydrocarbons, H2O and CO2 
C) nitrogen, ammonia 
D) nitrogen oxides, N2 and O2 
E) nitroglycerine, nitric acid, and glycerine

Question 11

The following reaction is second order in [A] and the rate constant is 0.039 M-1s-1: A → B
The concentration of A was 0.26 M at 28 s. The initial concentration of A was ________ M.

Accepted Answer

A) 0.36 
B) 2.8 
C) -1.2 
D) -1.5 
E) -0.83 
A) 0.36 
B) 2.8 
C) -1.2 
D) -1.5 
E) -0.83

Question 12

The isomerization of methylisonitrile to acetonitrile CH3NC (g) → CH3CN (g)
Is first order in CH3NC. The rate constant for the reaction is 9.45 × 10-5 s-1 at 478 K. The half-life of the reaction when the initial [CH3NC] is 0.030 M is ________ s.

Accepted Answer

A) 1.06 × 104 
B) 5.29 × 103 
C) 3.53 × 105 
D) 7.33 × 103 
E) 1.36 × 10-4 
A) 1.06 × 104 
B) 5.29 × 103 
C) 3.53 × 105 
D) 7.33 × 103 
E) 1.36 × 10-4

Question 13

The rate limiting step in a reaction is the slowest step in the reaction sequence.

Accepted Answer

A) True 
 B)False

Question 14

The reaction A → B is first order in [A]. Consider the following data.   The half-life of this reaction is ________ s.

Accepted Answer

A) 5.0 
B) 0.97 
C) 7.1 
D) 3.0 
E) 0.14 
A) 5.0 
B) 0.97 
C) 7.1 
D) 3.0 
E) 0.14

Question 15

The rate of a second order reaction can depend on the concentrations of more than one reactant.

Accepted Answer

A) True 
 B)False

Question 16

The reaction shown below is ________, and it is a ________ elementary reaction. A + B + C → ABC

Accepted Answer

A) termolecular, rare 
B) termolecular, common 
C) unimolecular, common 
D) bimolecular, rare 
E) unimolecular, rare 
A) termolecular, rare 
B) termolecular, common 
C) unimolecular, common 
D) bimolecular, rare 
E) unimolecular, rare

Question 17

The minimum energy to initiate a chemical reaction is the ________.

Accepted Answer

The answer of The minimum energy to initiate a chemical...

Question 18

The following reaction occurs in aqueous solution: NH4+ (aq) + NO2- → N2 (g) + 2H2O (l)
The data below is obtained at 25 °C.   The order of the reaction in NH4+ is ________.

Accepted Answer

A) -2 
B) -1 
C) +2 
D) +1 
E) 0 
A) -2 
B) -1 
C) +2 
D) +1 
E) 0

Question 19

The primary source of the specificity of enzymes is ________.

Accepted Answer

A) their polarity, which matches that of their specific substrate 
B) their delocalized electron cloud 
C) their bonded transition metal, which is specific to the target substrate 
D) their locations within the cell 
E) their shape, which relates to the lock-and-key model 
A) their polarity, which matches that of their specific substrate 
B) their delocalized electron cloud 
C) their bonded transition metal, which is specific to the target substrate 
D) their locations within the cell 
E) their shape, which relates to the lock-and-key model

Question 20

The combustion of ethylene proceeds by the reaction C2H4 (g) + 3O2 (g) → 2CO2 (g) + 2H2O (g)
When the rate of disappearance of O2 is 0.13 M s-1, the rate of disappearance of C2H4 is ________ M s-1.

Accepted Answer

A) 0.087 
B) 0.043 
C) 0.39 
D) 0.20 
E) 0.26 
A) 0.087 
B) 0.043 
C) 0.39 
D) 0.20 
E) 0.26

Exam 14: Chemical Kinetics

Rates of reaction can be positive or negative.

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

A second-order reaction has a half-life of 18 s when the initial concentration of reactant is 0.71 M. The rate constant for this reaction is ________ M-1s-1.

The rate of disappearance of HBr in the gas phase reaction 2HBr (g) → H2 (g)+ Br2 (g) Is 0.140 M s-1 at 150 °C. The rate of reaction is ________ M s-1.

In a linear graphical representation of a zero-order reaction, what value is represented by the y-intercept of the line drawn from plotting [A] vs. time?

The data in the table below were obtained for the reaction: A + B → P -The overall order of the reaction is ________.

The concentration of reactants or products at any time during the reaction can be calculated from the integrated rate law.

The enzyme nitrogenase converts ________ into ________.

The following reaction is second order in [A] and the rate constant is 0.039 M-1s-1: A → B The concentration of A was 0.26 M at 28 s. The initial concentration of A was ________ M.

The isomerization of methylisonitrile to acetonitrile CH3NC (g) → CH3CN (g) Is first order in CH3NC. The rate constant for the reaction is 9.45 × 10-5 s-1 at 478 K. The half-life of the reaction when the initial [CH3NC] is 0.030 M is ________ s.

The rate limiting step in a reaction is the slowest step in the reaction sequence.

The reaction A → B is first order in [A]. Consider the following data. The half-life of this reaction is ________ s.

The rate of a second order reaction can depend on the concentrations of more than one reactant.

The reaction shown below is ________, and it is a ________ elementary reaction. A + B + C → ABC

The minimum energy to initiate a chemical reaction is the ________.

The following reaction occurs in aqueous solution: NH4+ (aq) + NO2- → N2 (g) + 2H2O (l) The data below is obtained at 25 °C. The order of the reaction in NH4+ is ________.

The primary source of the specificity of enzymes is ________.

The combustion of ethylene proceeds by the reaction C2H4 (g) + 3O2 (g) → 2CO2 (g) + 2H2O (g) When the rate of disappearance of O2 is 0.13 M s-1, the rate of disappearance of C2H4 is ________ M s-1.

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

Thermochemistry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Molecular Geometry and Bonding Theories

Gases

Liquids and Intermolecular Forces

Solids and Modern Materials

Properties of Solutions

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

Filters

A second-order reaction has a half-life of 18 s when the initial concentration of reactant is 0.71 M. The rate constant for this reaction is ________ M^-1s^-1.

The rate of disappearance of HBr in the gas phase reaction 2HBr (g) → H₂ (g)+ Br₂ (g) Is 0.140 M s^-1 at 150 °C. The rate of reaction is ________ M s^-1.

The enzyme nitrogenase converts into .

The following reaction is second order in [A] and the rate constant is 0.039 M^-1s^-1: A → B The concentration of A was 0.26 M at 28 s. The initial concentration of A was ________ M.

The isomerization of methylisonitrile to acetonitrile CH₃NC (g) → CH₃CN (g) Is first order in CH₃NC. The rate constant for the reaction is 9.45 × 10^-5 s^-1 at 478 K. The half-life of the reaction when the initial [CH₃NC] is 0.030 M is ________ s.

The reaction shown below is , and it is a elementary reaction. A + B + C → ABC

The following reaction occurs in aqueous solution: NH₄⁺(aq) + NO₂^- → N₂(g) + 2H₂O (l) The data below is obtained at 25 °C. The order of the reaction in NH₄⁺ is ________.

The combustion of ethylene proceeds by the reaction C₂H₄ (g) + 3O₂ (g) → 2CO₂ (g) + 2H₂O (g) When the rate of disappearance of O₂ is 0.13 M s^-1, the rate of disappearance of C₂H₄ is ________ M s^-1.