Question 1

The following reaction is second order in [A] and the rate constant is   A → B What is the initial concentration (M)of A if at 28 s the concentration of A was 0.26 M?

Accepted Answer

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

Question 2

The half-life of a first-order reaction is 13 min.If the initial concentration of reactant is   it takes   for it to decrease to 0.055 M.

Accepted Answer

A) 8.2 
B) 11 
C) 3.6 
D) 0.048 
E) 8.4 
A) 8.2 
B) 11 
C) 3.6 
D) 0.048 
E) 8.4

Question 3

Define Beer's Law.

Accepted Answer

the direct relations

Question 4

The concentration of S2O82- remaining at 800 s is ________ M.

Accepted Answer

A) 0.046 
B) 0.076 
C) 4.00 × 10-3 
D) 0.015 
E) 0.041 
A) 0.046 
B) 0.076 
C) 4.00 × 10-3 
D) 0.015 
E) 0.041

Question 5

The magnitude of the rate constant is ________.

Accepted Answer

A) 5.56 
B) 0.278 
C) 13.2 
D) 42.0 
E) 2.21 
A) 5.56 
B) 0.278 
C) 13.2 
D) 42.0 
E) 2.21

Question 6

A burning splint will burn more vigorously in pure oxygen than in air because ________.

Accepted Answer

A) oxygen is a reactant in combustion and concentration of oxygen is higher in pure oxygen than is in air 
B) oxygen is a catalyst for combustion 
C) oxygen is a product of combustion 
D) nitrogen is a product of combustion and the system reaches equilibrium at a lower temperature 
E) nitrogen is a reactant in combustion and its low concentration in pure oxygen catalyzes the combustion 
A) oxygen is a reactant in combustion and concentration of oxygen is higher in pure oxygen than is in air 
B) oxygen is a catalyst for combustion 
C) oxygen is a product of combustion 
D) nitrogen is a product of combustion and the system reaches equilibrium at a lower temperature 
E) nitrogen is a reactant in combustion and its low concentration in pure oxygen catalyzes the combustion

Question 7

The decomposition of [A] in solution at 55 °C proceeds via first order: A (aq)→ B (aq)
What is the rate law for the reaction?

Accepted Answer

A) rate = k[A]2 
B) rate = k[A] 
C) rate =   
D) rate = k[A][B] 
E) rate = 2k[A] 
A) rate = k[A]2 
B) rate = k[A] 
C) rate =   
D) rate = k[A][B] 
E) rate = 2k[A]

Question 8

A ________ is a substance that speeds up a chemical reaction without itself being consumed in the reaction.

Accepted Answer

The answer of A ________ is a substance that speeds...

Question 9

If the rate law for the reaction A + 3B → C + 2D
Is zero order in A and first order in B,then the rate law is

Accepted Answer

A) k[A] 
B) k[A][B]3 
C) k[B] 
D) k[A][B] 
E) k[A]/[B]3 
A) k[A] 
B) k[A][B]3 
C) k[B] 
D) k[A][B] 
E) k[A]/[B]3

Question 10

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 11

During the combustion of ethylene gas,C2H4,carbon dioxide is produced and the rate of disappearance of O2 is 0.13 M   .What is the rate of appearance (M   )of CO2?

Accepted Answer

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

Question 12

The average rate of disappearance of A between 20 s and 40 s is ________ mol/s.

Accepted Answer

A) 8.5 × 10-4 
B) 1.7 × 10-3 
C) 590 
D) 7.1 × 10-3 
E) 1.4 × 10-3 
A) 8.5 × 10-4 
B) 1.7 × 10-3 
C) 590 
D) 7.1 × 10-3 
E) 1.4 × 10-3

Question 13

A reaction was found to be second order in carbon monoxide concentration.The rate of the reaction ________ if the [CO] is doubled,with everything else kept the same.

Accepted Answer

A) doubles 
B) remains unchanged 
C) triples 
D) increases by a factor of 4 
E) is reduced by a factor of 2 
A) doubles 
B) remains unchanged 
C) triples 
D) increases by a factor of 4 
E) is reduced by a factor of 2

Question 14

The rate constant for a particular second-order reaction is 0.47     .If the initial concentration of reactant is   it takes ________ s for the concentration to decrease to

Accepted Answer

A) 2.1 
B) 1.4 
C) 1.0 
D) 0.47 
E) 0.20 
A) 2.1 
B) 1.4 
C) 1.0 
D) 0.47 
E) 0.20

Question 15

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

Accepted Answer

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

Question 16

The rate law for a reaction is rate = k[A][B]
Which one of the following statements is false?

Accepted Answer

A) The reaction is first order overall. 
B) The reaction is first order in [A]. 
C) The reaction is first order in [B]. 
D) k is the reaction rate constant 
E) If [A] is doubled, the reaction rate will increase by a factor of 2. 
A) The reaction is first order overall. 
B) The reaction is first order in [A]. 
C) The reaction is first order in [B]. 
D) k is the reaction rate constant 
E) If [A] is doubled, the reaction rate will increase by a factor of 2.

Question 17

Which one of the following graphs shows the correct relationship between concentration and time for a reaction that is second order in [A]?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 18

The rate of a reaction depends on ________.

Accepted Answer

A) collision frequency 
B) collision energy 
C) collision orientation 
D) all of the above 
E) none of the above 
A) collision frequency 
B) collision energy 
C) collision orientation 
D) all of the above 
E) none of the above

Question 19

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

Question 20

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

Exam 14: Chemical Kinetics

The following reaction is second order in [A] and the rate constant is A → B What is the initial concentration (M)of A if at 28 s the concentration of A was 0.26 M?

The half-life of a first-order reaction is 13 min.If the initial concentration of reactant is it takes for it to decrease to 0.055 M.

Define Beer's Law.

The concentration of S2O82- remaining at 800 s is ________ M.

The magnitude of the rate constant is ________.

A burning splint will burn more vigorously in pure oxygen than in air because ________.

The decomposition of [A] in solution at 55 °C proceeds via first order: A (aq)→ B (aq) What is the rate law for the reaction?

A ________ is a substance that speeds up a chemical reaction without itself being consumed in the reaction.

If the rate law for the reaction A + 3B → C + 2D Is zero order in A and first order in B,then the rate law is

The primary source of the specificity of enzymes is ________.

During the combustion of ethylene gas,C2H4,carbon dioxide is produced and the rate of disappearance of O2 is 0.13 M .What is the rate of appearance (M )of CO2?

The average rate of disappearance of A between 20 s and 40 s is ________ mol/s.

A reaction was found to be second order in carbon monoxide concentration.The rate of the reaction ________ if the [CO] is doubled,with everything else kept the same.

The rate constant for a particular second-order reaction is 0.47 .If the initial concentration of reactant is it takes ________ s for the concentration to decrease to

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

The rate law for a reaction is rate = k[A][B] Which one of the following statements is false?

Which one of the following graphs shows the correct relationship between concentration and time for a reaction that is second order in [A]?

The rate of a reaction depends on ________.

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

Introduction: Matter, energy, and Measurement

Atoms, molecules, and Ions

Chemical Reactions and Reaction Stoichiometry

Reactions in Aqueous Solution

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

The concentration of S₂O₈^2- remaining at 800 s is ________ M.

The decomposition of [A] in solution at 55 °C proceeds via first order: A(aq)→ B(aq) What is the rate law for the reaction?

During the combustion of ethylene gas,C₂H₄,carbon dioxide is produced and the rate of disappearance of O₂ is 0.13 M .What is the rate of appearance (M )of CO₂?

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.