Question 1

The rate of a ________-_________________ is a constant that is independent of reactant concentration.

Accepted Answer

zeroth-ord

Question 2

The rate law cannot be predicted from the stoichiometry of a reaction.

Accepted Answer

A) True 
 B)False

Question 3

What is the integrated rate law for a second-order reaction?

Accepted Answer

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

Question 4

The first-order reaction SO2Cl2→ SO2 + Cl2 is 10% complete in 80.min.How long would it take for the reaction to be 95% complete?

Accepted Answer

A) 1.8 min 
B) 104 min 
C) 530 min 
D) 2300 min 
E) 990 min 
A) 1.8 min 
B) 104 min 
C) 530 min 
D) 2300 min 
E) 990 min

Question 5

For the following reaction,ΔP(C6H14)/Δt was found to be -6.2 × 10-3 atm/s. C6H14(g)→ C6H6(g)+ 4H2(g)
Determine ΔP(H2)/Δt for this reaction at the same time.

Accepted Answer

A) 6.2 × 10-3 atm/s 
B) 1.6 × 10-3 atm/s 
C) 2.5 × 10-2 atm/s 
D) -1.6 × 10-3 atm/s 
E) -2.5 × 10-2 atm/s 
A) 6.2 × 10-3 atm/s 
B) 1.6 × 10-3 atm/s 
C) 2.5 × 10-2 atm/s 
D) -1.6 × 10-3 atm/s 
E) -2.5 × 10-2 atm/s

Question 6

For a second-order reaction,if [A]-1 is plotted vs.time,which corresponds to the slope of this plot?

Accepted Answer

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

Question 7

When [OH-] doubles,the rate doubles.

Accepted Answer

A) The reaction is first order with respect to CH3Cl 
B) The reaction is first order with respect to OH-. 
C) The reaction is second order overall 
D) All of the answers are correct. 
A) The reaction is first order with respect to CH3Cl 
B) The reaction is first order with respect to OH-. 
C) The reaction is second order overall 
D) All of the answers are correct.

Question 8

The radioactive isotope tritium decays with a first-order rate constant k of 0.056 yr-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 × 10-38 
E) 0.81 
A) 0.19 
B) 0.60 
C) 0.15 
D) 2.8 × 10-38 
E) 0.81

Question 9

The step of the reaction mechanism which is the slowest step is called _______-________.

Accepted Answer

The answer of The step of the reaction mechanism which...

Question 10

Which is the correct unit for a zeroth-order rate constant?

Accepted Answer

A) s-1 
B) M • s-1 
C) M • s 
D) M-1 • s-1 
E) M-2 • s-1 
A) s-1 
B) M • s-1 
C) M • s 
D) M-1 • s-1 
E) M-2 • s-1

Question 11

What is the half-life for a second-order reaction?

Accepted Answer

A) t1/2 = k 
B) t1/2 = 1/k[A]o 
C) t1/2 = 0.693/k[A]o 
D) t1/2 = [A]o/2k 
E) t1/2 = 0.693/k 
A) t1/2 = k 
B) t1/2 = 1/k[A]o 
C) t1/2 = 0.693/k[A]o 
D) t1/2 = [A]o/2k 
E) t1/2 = 0.693/k

Question 12

The activation energy for the following first-order reaction is 102 kJ/mol. N2O5(g)→ 2NO2(g)+ (1/2)O2(g)
The value of the rate constant (k)is 1.35 × 10-4 s-1 at 35°C.What is the value of k at 0°C? (R =8.314 J/mol• K)

Accepted Answer

A) 8.2 × 10-7 s-1 
B) 1.9 × 10-5 s-1 
C) 4.2 × 10-5 s-1 
D) 2.2 × 10-2 s-1 
E) 1.2 × 106 s-1 
A) 8.2 × 10-7 s-1 
B) 1.9 × 10-5 s-1 
C) 4.2 × 10-5 s-1 
D) 2.2 × 10-2 s-1 
E) 1.2 × 106 s-1

Question 13

kJ/mol. Sn2+ + 2Co3+ → Sn4+ + 2Co2+
By what factor will the rate constant increase when the temperature is raised from 10°C to 28°C? (R = 8.314 J/mol• K)

Accepted Answer

A) 1.002 
B) 4.6 
C) 5.6 
D) 2.8 
E) 696 
A) 1.002 
B) 4.6 
C) 5.6 
D) 2.8 
E) 696

Question 14

Consider the following potential energy profile for the A → B reaction.Assuming that the frequency factor for the reaction is 5.5×1010 s-1,what is the rate constant of this first-order reaction at 310 K?

Accepted Answer

A) 2 × 102 s-1 
B) 5 × 105 s-1 
C) 1 × 1019 s-1 
D) 2 × 107 s-1 
A) 2 × 102 s-1 
B) 5 × 105 s-1 
C) 1 × 1019 s-1 
D) 2 × 107 s-1

Question 15

Below is a plot of the reaction of A decomposing to form products.   Based on the figure,which might be the order of the reaction with respect to A?

Accepted Answer

A) The reaction must only be zeroth order in A. 
B) The reaction must only be first order in A. 
C) The reaction must only be second order in A. 
D) The reaction could be either first order in A or second order in A. 
E) The reaction could be of any order in A. 
A) The reaction must only be zeroth order in A. 
B) The reaction must only be first order in A. 
C) The reaction must only be second order in A. 
D) The reaction could be either first order in A or second order in A. 
E) The reaction could be of any order in A.

Question 16

Consider the general reaction 5Br-(aq)+ Br O3-(aq)+ 6H+(aq)→ 3Br2(aq)+ 3 H2O(aq)
For this reaction,which is equal to Δ[Br2]/Δt?

Accepted Answer

A) -Δ[H2O]/Δt 
B) 3Δ[Br O3-]/Δt 
C) -5Δ[Br-]/Δt 
D) -0.6Δ[Br-]/Δt 
E) None of these choices is correct. 
A) -Δ[H2O]/Δt 
B) 3Δ[Br O3-]/Δt 
C) -5Δ[Br-]/Δt 
D) -0.6Δ[Br-]/Δt 
E) None of these choices is correct.

Question 17

What is the integrated rate law for a first-order reaction?

Accepted Answer

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

Question 18

What is the slope of a plot of ln k vs.1/T for the Arrhenius equation k = Ae-(Ea/RT)?

Accepted Answer

A) A 
B) -k 
C) -Ea/R 
D) k 
E) Ea 
A) A 
B) -k 
C) -Ea/R 
D) k 
E) Ea

Question 19

The isomerization of cyclopropane follows first-order kinetics.The rate constant at 700.K is 6.20 × 10-4 min-1,and the half-life at 760.K is 29.0 min.What is the activation energy for this reaction? (R = 8.314 J/mol• K)

Accepted Answer

A) 5.07 kJ/mol 
B) 27.0 kJ/mol 
C) 50.7 kJ/mol 
D) 160.kJ/mol 
E) 269 kJ/mol 
A) 5.07 kJ/mol 
B) 27.0 kJ/mol 
C) 50.7 kJ/mol 
D) 160.kJ/mol 
E) 269 kJ/mol

Question 20

A reaction has the following rate law: rate = k[A][B]2
In experiment 1,the concentrations of A and B are both 0.10 mol • L-1; in experiment 2,the concentrations are both 0.30 mol • L-1.If the temperature stays constant,what is the value of the ratio,rate(2)/rate(1)?

Accepted Answer

A) 3.0 
B) 6.0 
C) 9.0 
D) 18 
E) 27 
A) 3.0 
B) 6.0 
C) 9.0 
D) 18 
E) 27

Exam 14: Chemical Kinetics

The rate of a ________-_________________ is a constant that is independent of reactant concentration.

The rate law cannot be predicted from the stoichiometry of a reaction.

What is the integrated rate law for a second-order reaction?

The first-order reaction SO2Cl2→ SO2 + Cl2 is 10% complete in 80.min.How long would it take for the reaction to be 95% complete?

For the following reaction,ΔP(C6H14)/Δt was found to be -6.2 × 10-3 atm/s. C6H14(g)→ C6H6(g)+ 4H2(g) Determine ΔP(H2)/Δt for this reaction at the same time.

For a second-order reaction,if [A]-1 is plotted vs.time,which corresponds to the slope of this plot?

When [OH-] doubles,the rate doubles.

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

The step of the reaction mechanism which is the slowest step is called _______-________.

Which is the correct unit for a zeroth-order rate constant?

What is the half-life for a second-order reaction?

The activation energy for the following first-order reaction is 102 kJ/mol. N2O5(g)→ 2NO2(g)+ (1/2)O2(g) The value of the rate constant (k)is 1.35 × 10-4 s-1 at 35°C.What is the value of k at 0°C? (R =8.314 J/mol• K)

kJ/mol. Sn2+ + 2Co3+ → Sn4+ + 2Co2+ By what factor will the rate constant increase when the temperature is raised from 10°C to 28°C? (R = 8.314 J/mol• K)

Consider the following potential energy profile for the A → B reaction.Assuming that the frequency factor for the reaction is 5.5×1010 s-1,what is the rate constant of this first-order reaction at 310 K?

Below is a plot of the reaction of A decomposing to form products. Based on the figure,which might be the order of the reaction with respect to A?

Consider the general reaction 5Br-(aq)+ Br O3-(aq)+ 6H+(aq)→ 3Br2(aq)+ 3 H2O(aq) For this reaction,which is equal to Δ[Br2]/Δt?

What is the integrated rate law for a first-order reaction?

What is the slope of a plot of ln k vs.1/T for the Arrhenius equation k = Ae-(Ea/RT)?

The isomerization of cyclopropane follows first-order kinetics.The rate constant at 700.K is 6.20 × 10-4 min-1,and the half-life at 760.K is 29.0 min.What is the activation energy for this reaction? (R = 8.314 J/mol• K)

A reaction has the following rate law: rate = k[A][B]2 In experiment 1,the concentrations of A and B are both 0.10 mol • L-1; in experiment 2,the concentrations are both 0.30 mol • L-1.If the temperature stays constant,what is the value of the ratio,rate(2)/rate(1)?

Chemistry: the Central Science

Atoms Molecules and Ions

Stoichiometry Ratios of Combination

Reactions in Aqueous Solutions

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Electron Configuration and the Periodic Table

Chemical Bonding I Basic Concepts

Chemical Bonding Ii Molecular Geometry and Bonding Theories

Gases

Intermolecular Forces and the Physical Properties of Liquids and Solids

Modern Materials

Physical Properties of Solutions

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy Free Energy and Equilibrium

Electrochemistry

Nuclear Chemistry

Environmental Chemistry

Coordination Chemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Organic Chemistry

Filters

The rate of a -_________ is a constant that is independent of reactant concentration.

The first-order reaction SO₂Cl₂→ SO₂ + Cl₂ is 10% complete in 80.min.How long would it take for the reaction to be 95% complete?

For the following reaction,ΔP(C₆H₁₄)/Δt was found to be -6.2 × 10^-3 atm/s. C₆H₁₄(g)→ C₆H₆(g)+ 4H₂(g) Determine ΔP(H₂)/Δt for this reaction at the same time.

For a second-order reaction,if [A]^-1 is plotted vs.time,which corresponds to the slope of this plot?

When [OH^-] doubles,the rate doubles.

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

The step of the reaction mechanism which is the slowest step is called _-__.

The activation energy for the following first-order reaction is 102 kJ/mol. N₂O₅(g)→ 2NO₂(g)+ (1/2)O₂(g) The value of the rate constant (k)is 1.35 × 10^-4 s^-1 at 35°C.What is the value of k at 0°C? (R =8.314 J/mol• K)

kJ/mol. Sn²⁺ + 2Co³⁺ → Sn₄⁺ + 2Co²⁺ By what factor will the rate constant increase when the temperature is raised from 10°C to 28°C? (R = 8.314 J/mol• K)

Consider the following potential energy profile for the A → B reaction.Assuming that the frequency factor for the reaction is 5.5×10¹⁰ s^-1,what is the rate constant of this first-order reaction at 310 K?

Consider the general reaction 5Br-(aq)+ Br O₃-(aq)+ 6H+(aq)→ 3Br₂(aq)+ 3 H₂O(aq) For this reaction,which is equal to Δ[Br2]/Δt?

What is the slope of a plot of ln k vs.1/T for the Arrhenius equation k = Ae^-(^E^a/^RT⁾?

The isomerization of cyclopropane follows first-order kinetics.The rate constant at 700.K is 6.20 × 10^-4 min^-1,and the half-life at 760.K is 29.0 min.What is the activation energy for this reaction? (R = 8.314 J/mol• K)

A reaction has the following rate law: rate = k[A][B]² In experiment 1,the concentrations of A and B are both 0.10 mol • L^-1; in experiment 2,the concentrations are both 0.30 mol • L^-1.If the temperature stays constant,what is the value of the ratio,rate(2)/rate(1)?