Question 1

The relative initial rates of the reaction A2 + B2 → products in vessels (a) -(d) are 1:1:4:4.Unshaded spheres represent A2 molecules,and shaded spheres represent B2 molecules present at the beginning of the reaction. 2 + B2 → products in vessels (a) -(d) are 1:1:4:4.Unshaded spheres represent A2 molecules,and shaded spheres represent B2 molecules present at the beginning of the reaction.   -What is the order of reaction with respect to B2? A) 0 B) 1 C) 2 D) 3" class="answers-bank-image d-inline" rel="preload" >
-What is the order of reaction with respect to B2?

Accepted Answer

A)  0
B)  1
C)  2
D)  3E) C) and D)
F) A) and D)

Question 2

The reaction: 2 HI → H2 + I2,is second order and the rate constant at 800 K is 9.70 × 10-2 M-1 s-1.How long will it take for 8.00 × 10-2 mol/L of HI to decrease to one-fourth of its initial concentration?

Accepted Answer

A)  0.619 s
B)  124 s
C)  387 s
D)  429 sE) A) and C)
F) None of the above

Question 3

Which statement below regarding the half-life of a zeroth-order reaction is true?

Accepted Answer

A)  Each half-life is half as long as the preceding half-life.
B)  Each half-life is twice as long as the preceding half-life.
C)  Each half-life is four times as long as the preceding half-life.
D)  The half-life remains unchanged throughout the course of the reaction.E) A) and B)
F) All of the above

Question 4

A gaseous reaction occurs by a two-step mechanism,shown below. Step 1: AX +Y2 ⇌ AXY2 fast
Step 2: AXY2 + AX → 2 AXY slow
Including concentration of only reactants and products,what is the rate law for this reaction?

Accepted Answer

A)  Rate = k[AX][XY2]
B)  Rate = k[AXY2]/[AX][Y2]
C)  Rate = k[AX]2[Y2]
D)  Rate = k[AXY]2/[A Y2][AX]E) None of the above
F) C) and D)

Question 5

For the reaction shown below,what is the order of reaction with respect to Br? ClO2-(aq) + 4 Br-(aq) + 4 H+(aq) → Cl-(aq) + 2 Br2(aq) +2 H2O(l)

Accepted Answer

A)  1st order
B)  2nd order
C)  4th order
D)  can't tell from the information providedE) B) and D)
F) A) and B)

Question 6

Consider the first-order decomposition of A molecules (shaded spheres) in two vessels of equal volume.How will the half-life of decomposition in vessel (a) be affected if the volume of the vessel is decreased by a factor of 2?

Accepted Answer

A)  decrease by 1/2
B)  increase by 2
C)  increase by 4
D)  stay the sameE) None of the above
F) A) and B)

Question 7

The following set of data was obtained by the method of initial rates for the reaction: (H3C) 3CBr + OH- → (H3C) 3COH + Br-
What is the order of reaction with respect to ion,OH-? 3C) 3CBr + OH- → (H3C) 3COH + Br- What is the order of reaction with respect to ion,OH-?   A) zero B) first C) second D) none of these" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  zero
B)  first
C)  second
D)  none of theseE) B) and D)
F) None of the above

Question 8

The decomposition of hydrogen peroxide occurs according to the equation
2 H2O2(aq)→ 2 H2O(l)+ O2(g)
A concentration-time study of this reaction produces a straight line when ln[H2O2] is plotted versus time.Therefore,this is a ________ order reaction.

Accepted Answer

Question 9

The second-order reaction 2 Mn(CO) 5 → Mn2(CO) 10,has a rate constant equal to 3.0 × 109 M-1 s-1 at 25°C.If the initial concentration of Mn(CO) 5 is 5.0 × 10-5 M,how long will it take for 90.% of the reactant to disappear?

Accepted Answer

A)  1.7 × 10-15 s
B)  1.9 × 10-14 s
C)  6.0 × 10-5 s
D)  1.5 × 102 sE) B) and C)
F) A) and D)

Question 10

The decomposition of hydrogen peroxide is given by the following reaction: 2 H2O2(aq) → 2 H2O(l) + O2(g) 
In the presence of KI the reaction is thought to occur by the following mechanism:
Step 1: H2O2 + I- → H2O + IO-
Step 2: IO- + H2O2 → H2O + O2 + I-
What is the role of I- in this mechanism?

Accepted Answer

A)  catalyst
B)  frequency factor
C)  product
D)  transition stateE) A) and B)
F) A) and D)

Question 11

Acetaldehyde decomposes at 750 K: CH3CHO → CO + CH4.The reaction is first order in acetaldehyde and the half-life of the reaction is found to be 530 seconds.What is the rate constant for the reaction at this temperature?

Accepted Answer

A)  2.7 × 10-3 s-1
B)  1.3 × 10-3 s-1
C)  2.7 × 102 s-1
D)  7.6 × 102 s-1E) B) and C)
F) B) and D)

Question 12

Consider a reaction that occurs by the following one-step mechanism:
A2 + B2 → 2 AB
The potential energy profile for this reaction is shown below. 2 + B2 → 2 AB The potential energy profile for this reaction is shown below.   -What is the species present at reaction stage 2? A) an intermediate B) a product C) a reactant D) a transition state" class="answers-bank-image d-inline" rel="preload" >
-What is the species present at reaction stage 2?

Accepted Answer

A)  an intermediate
B)  a product
C)  a reactant
D)  a transition stateE) A) and B)
F) None of the above

Question 13

Which of the following statements are true about reaction mechanisms? I.A rate law can be written from the molecularity of the slowest elementary step.
II.The final rate law can include intermediates.
III.The rate of the reaction is dependent on the fastest step in the mechanism.
IV.A mechanism can never be proven to be the correct pathway for a reaction.

Accepted Answer

A)  I,II,III
B)  II,IV
C)  I,III
D)  I,IVE) A) and B)
F) All of the above

Question 14

An aqueous reaction occurs by a two-step mechanism,shown below. Step 1: A2X2 + Y → A2X + XY
Step 2: A2X2 + XY → A2X + X2 + Y
What is the catalyst in this reaction?

Accepted Answer

A)  A2X2
B)  X2
C)  XY
D)  YE) A) and B)
F) A) and C)

Question 15

The first-order reaction,SO2Cl2 → SO2 + Cl2,has a rate constant equal to 2.20 × 10-5 s-1 at 593 K.What percentage of the initial amount SO2Cl2 will remain after 3.00 hours?

Accepted Answer

A)  1.00%
B)  21.1%
C)  23.5%
D)  78.9%E) None of the above
F) A) and D)

Question 16

The reaction that occurs in a Breathalyzer,a device used to determine the alcohol level in a person's bloodstream,is given below.If the rate of appearance of Cr2(SO4) 3 is 1.24 mol/min at a particular moment,what is the rate of disappearance of C2H6O at that moment? 2(SO4) 3 is 1.24 mol/min at a particular moment,what is the rate of disappearance of C2H6O at that moment?   A) 0.413 mol/min B) 0.826 mol/min C) 1.86 mol/min D) 3.72 mol/min" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  0.413 mol/min
B)  0.826 mol/min
C)  1.86 mol/min
D)  3.72 mol/minE) A) and D)
F) A) and C)

Question 17

The reaction below is second order in ClO2 and first order in OH-.When the concentration of ClO2 is 0.020 M and the concentration of OH- is 0.10 M,the initial rate of reaction is 8.00 × 10-4 M/s.What is the rate constant,k,for this reaction?
2 ClO2(aq)+ 2 OH-(aq)→ ClO3-(aq)+ ClO2-(aq)+ H2O(l)

Accepted Answer

Question 18

Which part of the Arrhenius equation contains a term which measures the number of molecules that have the correct orientation for reaction?

Accepted Answer

A)  activation energy
B)  e-Ea/RT
C)  frequency factor
D)  none of theseE) A) and D)
F) B) and C)

Question 19

The decomposition of ammonia to nitrogen and hydrogen on a tungsten filament at 800°C is independent of the concentration of ammonia at high pressures of ammonia.What is the order of the reaction with respect to ammonia?

Accepted Answer

A)  zero
B)  first
C)  second
D)  thirdE) A) and C)
F) B) and D)

Question 20

The following set of data was obtained by the method of initial rates for the reaction: S2O82-(aq) + 3 I-(aq) → 2 SO42-(aq) + I3-(aq) 
What is the rate law for the reaction? 2O82-(aq) + 3 I-(aq) → 2 SO42-(aq) + I3-(aq)  What is the rate law for the reaction?   A) Rate = k[S2O82-][I-] B) Rate = k[S2O82-][I-]5 C) Rate = k[S2O82-][I-]2 D) Rate = k[S2O82-]2[I-]" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  Rate = k[S2O82-][I-]
B)  Rate = k[S2O82-][I-]5
C)  Rate = k[S2O82-][I-]2
D)  Rate = k[S2O82-]2[I-]E) B) and C)
F) A) and D)

Exam 13: Chemical Kinetics

The reaction: 2 HI → H₂ + I₂,is second order and the rate constant at 800 K is 9.70 × 10^-2 M^-1 s^-1.How long will it take for 8.00 × 10^-2 mol/L of HI to decrease to one-fourth of its initial concentration?

Correct Answer
verified

Which statement below regarding the half-life of a zeroth-order reaction is true?

Correct Answer
verified

Which part of the Arrhenius equation contains a term which measures the number of molecules that have the correct orientation for reaction?

Correct Answer
verified

For the reaction shown below,what is the order of reaction with respect to Br^? ClO₂^-(aq) + 4 Br^-(aq) + 4 H⁺(aq) → Cl^-(aq) + 2 Br₂(aq) +2 H₂O(l)

Correct Answer
verified

The decomposition of ammonia to nitrogen and hydrogen on a tungsten filament at 800°C is independent of the concentration of ammonia at high pressures of ammonia.What is the order of the reaction with respect to ammonia?

Correct Answer
verified

The following set of data was obtained by the method of initial rates for the reaction: S₂O₈^2-(aq) + 3 I^-(aq) → 2 SO₄^2-(aq) + I₃^-(aq) What is the rate law for the reaction?

Correct Answer
verified

Correct Answer
verified

Acetaldehyde decomposes at 750 K: CH₃CHO → CO + CH₄.The reaction is first order in acetaldehyde and the half-life of the reaction is found to be 530 seconds.What is the rate constant for the reaction at this temperature?

Correct Answer
verified

The following set of data was obtained by the method of initial rates for the reaction: (H₃C) ₃CBr + OH^- → (H₃C) ₃COH + Br^- What is the order of reaction with respect to ion,OH^-?

Correct Answer
verified

Consider the first-order decomposition of A molecules (shaded spheres) in two vessels of equal volume.How will the half-life of decomposition in vessel (a) be affected if the volume of the vessel is decreased by a factor of 2?

Correct Answer
verified

The second-order reaction 2 Mn(CO) ₅ → Mn₂(CO) ₁₀,has a rate constant equal to 3.0 × 10⁹ M^-1 s^-1 at 25°C.If the initial concentration of Mn(CO) ₅ is 5.0 × 10^-5 M,how long will it take for 90.% of the reactant to disappear?

Correct Answer
verified

The first-order reaction,SO₂Cl₂ → SO₂ + Cl₂,has a rate constant equal to 2.20 × 10^-5 s^-1 at 593 K.What percentage of the initial amount SO₂Cl₂ will remain after 3.00 hours?

Correct Answer
verified

An aqueous reaction occurs by a two-step mechanism,shown below. Step 1: A₂X₂ + Y → A₂X + XY Step 2: A₂X₂ + XY → A₂X + X₂ + Y What is the catalyst in this reaction?

Correct Answer
verified

A gaseous reaction occurs by a two-step mechanism,shown below. Step 1: AX +Y₂ ⇌ AXY_{2 fast} Step 2: AXY₂ + AX → 2 AXY slow Including concentration of only reactants and products,what is the rate law for this reaction?

Correct Answer
verified

The reaction that occurs in a Breathalyzer,a device used to determine the alcohol level in a person's bloodstream,is given below.If the rate of appearance of Cr₂(SO₄) ₃ is 1.24 mol/min at a particular moment,what is the rate of disappearance of C₂H₆O at that moment?

Correct Answer
verified

Correct Answer
verified

Consider a reaction that occurs by the following one-step mechanism: A₂ + B₂ → 2 AB The potential energy profile for this reaction is shown below. -What is the species present at reaction stage 2?

Correct Answer
verified

The relative initial rates of the reaction A₂ + B₂ → products in vessels (a) -(d) are 1:1:4:4.Unshaded spheres represent A₂ molecules,and shaded spheres represent B₂ molecules present at the beginning of the reaction. -What is the order of reaction with respect to B₂?

Correct Answer
verified

Correct Answer
verified

The decomposition of hydrogen peroxide occurs according to the equation 2 H₂O₂(aq)→ 2 H₂O(l)+ O₂(g) A concentration-time study of this reaction produces a straight line when ln[H₂O₂] is plotted versus time.Therefore,this is a ________ order reaction.

Correct Answer
verified

Exam 13: Chemical Kinetics

The reaction: 2 HI → H2 + I2,is second order and the rate constant at 800 K is 9.70 × 10-2 M-1 s-1.How long will it take for 8.00 × 10-2 mol/L of HI to decrease to one-fourth of its initial concentration?

Correct AnswerverifiedShow Answer

Which statement below regarding the half-life of a zeroth-order reaction is true?

Correct AnswerverifiedShow Answer

Which part of the Arrhenius equation contains a term which measures the number of molecules that have the correct orientation for reaction?

Correct AnswerverifiedShow Answer

For the reaction shown below,what is the order of reaction with respect to Br? ClO2-(aq) + 4 Br-(aq) + 4 H+(aq) → Cl-(aq) + 2 Br2(aq) +2 H2O(l)

Correct AnswerverifiedShow Answer

The decomposition of ammonia to nitrogen and hydrogen on a tungsten filament at 800°C is independent of the concentration of ammonia at high pressures of ammonia.What is the order of the reaction with respect to ammonia?

Correct AnswerverifiedShow Answer

The following set of data was obtained by the method of initial rates for the reaction: S2O82-(aq) + 3 I-(aq) → 2 SO42-(aq) + I3-(aq) What is the rate law for the reaction?

Correct AnswerverifiedShow Answer

The reaction below is second order in ClO2 and first order in OH-.When the concentration of ClO2 is 0.020 M and the concentration of OH- is 0.10 M,the initial rate of reaction is 8.00 × 10-4 M/s.What is the rate constant,k,for this reaction? 2 ClO2(aq)+ 2 OH-(aq)→ ClO3-(aq)+ ClO2-(aq)+ H2O(l)

Correct AnswerverifiedShow Answer

Acetaldehyde decomposes at 750 K: CH3CHO → CO + CH4.The reaction is first order in acetaldehyde and the half-life of the reaction is found to be 530 seconds.What is the rate constant for the reaction at this temperature?

Correct AnswerverifiedShow Answer

The following set of data was obtained by the method of initial rates for the reaction: (H3C) 3CBr + OH- → (H3C) 3COH + Br- What is the order of reaction with respect to ion,OH-?

Correct AnswerverifiedShow Answer

Consider the first-order decomposition of A molecules (shaded spheres) in two vessels of equal volume.How will the half-life of decomposition in vessel (a) be affected if the volume of the vessel is decreased by a factor of 2?

Correct AnswerverifiedShow Answer

The second-order reaction 2 Mn(CO) 5 → Mn2(CO) 10,has a rate constant equal to 3.0 × 109 M-1 s-1 at 25°C.If the initial concentration of Mn(CO) 5 is 5.0 × 10-5 M,how long will it take for 90.% of the reactant to disappear?

Correct AnswerverifiedShow Answer

The first-order reaction,SO2Cl2 → SO2 + Cl2,has a rate constant equal to 2.20 × 10-5 s-1 at 593 K.What percentage of the initial amount SO2Cl2 will remain after 3.00 hours?

Correct AnswerverifiedShow Answer

An aqueous reaction occurs by a two-step mechanism,shown below. Step 1: A2X2 + Y → A2X + XY Step 2: A2X2 + XY → A2X + X2 + Y What is the catalyst in this reaction?

Correct AnswerverifiedShow Answer

A gaseous reaction occurs by a two-step mechanism,shown below. Step 1: AX +Y2 ⇌ AXY2 fast Step 2: AXY2 + AX → 2 AXY slow Including concentration of only reactants and products,what is the rate law for this reaction?

Correct AnswerverifiedShow Answer

The reaction that occurs in a Breathalyzer,a device used to determine the alcohol level in a person's bloodstream,is given below.If the rate of appearance of Cr2(SO4) 3 is 1.24 mol/min at a particular moment,what is the rate of disappearance of C2H6O at that moment?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Consider a reaction that occurs by the following one-step mechanism: A2 + B2 → 2 AB The potential energy profile for this reaction is shown below. -What is the species present at reaction stage 2?

Correct AnswerverifiedShow Answer

The relative initial rates of the reaction A2 + B2 → products in vessels (a) -(d) are 1:1:4:4.Unshaded spheres represent A2 molecules,and shaded spheres represent B2 molecules present at the beginning of the reaction. -What is the order of reaction with respect to B2?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The decomposition of hydrogen peroxide occurs according to the equation 2 H2O2(aq)→ 2 H2O(l)+ O2(g) A concentration-time study of this reaction produces a straight line when ln[H2O2] is plotted versus time.Therefore,this is a ________ order reaction.

Correct AnswerverifiedShow Answer

The reaction: 2 HI → H₂ + I₂,is second order and the rate constant at 800 K is 9.70 × 10^-2 M^-1 s^-1.How long will it take for 8.00 × 10^-2 mol/L of HI to decrease to one-fourth of its initial concentration?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

For the reaction shown below,what is the order of reaction with respect to Br^? ClO₂^-(aq) + 4 Br^-(aq) + 4 H⁺(aq) → Cl^-(aq) + 2 Br₂(aq) +2 H₂O(l)

Correct Answer
verified

Correct Answer
verified

The following set of data was obtained by the method of initial rates for the reaction: S₂O₈^2-(aq) + 3 I^-(aq) → 2 SO₄^2-(aq) + I₃^-(aq) What is the rate law for the reaction?

Correct Answer
verified

Correct Answer
verified

Acetaldehyde decomposes at 750 K: CH₃CHO → CO + CH₄.The reaction is first order in acetaldehyde and the half-life of the reaction is found to be 530 seconds.What is the rate constant for the reaction at this temperature?

Correct Answer
verified

The following set of data was obtained by the method of initial rates for the reaction: (H₃C) ₃CBr + OH^- → (H₃C) ₃COH + Br^- What is the order of reaction with respect to ion,OH^-?

Correct Answer
verified

Correct Answer
verified

The second-order reaction 2 Mn(CO) ₅ → Mn₂(CO) ₁₀,has a rate constant equal to 3.0 × 10⁹ M^-1 s^-1 at 25°C.If the initial concentration of Mn(CO) ₅ is 5.0 × 10^-5 M,how long will it take for 90.% of the reactant to disappear?

Correct Answer
verified

The first-order reaction,SO₂Cl₂ → SO₂ + Cl₂,has a rate constant equal to 2.20 × 10^-5 s^-1 at 593 K.What percentage of the initial amount SO₂Cl₂ will remain after 3.00 hours?

Correct Answer
verified

An aqueous reaction occurs by a two-step mechanism,shown below. Step 1: A₂X₂ + Y → A₂X + XY Step 2: A₂X₂ + XY → A₂X + X₂ + Y What is the catalyst in this reaction?

Correct Answer
verified

A gaseous reaction occurs by a two-step mechanism,shown below. Step 1: AX +Y₂ ⇌ AXY_{2 fast} Step 2: AXY₂ + AX → 2 AXY slow Including concentration of only reactants and products,what is the rate law for this reaction?

Correct Answer
verified

The reaction that occurs in a Breathalyzer,a device used to determine the alcohol level in a person's bloodstream,is given below.If the rate of appearance of Cr₂(SO₄) ₃ is 1.24 mol/min at a particular moment,what is the rate of disappearance of C₂H₆O at that moment?

Correct Answer
verified

Correct Answer
verified

Consider a reaction that occurs by the following one-step mechanism: A₂ + B₂ → 2 AB The potential energy profile for this reaction is shown below. -What is the species present at reaction stage 2?

Correct Answer
verified

The relative initial rates of the reaction A₂ + B₂ → products in vessels (a) -(d) are 1:1:4:4.Unshaded spheres represent A₂ molecules,and shaded spheres represent B₂ molecules present at the beginning of the reaction. -What is the order of reaction with respect to B₂?

Correct Answer
verified

Correct Answer
verified

The decomposition of hydrogen peroxide occurs according to the equation 2 H₂O₂(aq)→ 2 H₂O(l)+ O₂(g) A concentration-time study of this reaction produces a straight line when ln[H₂O₂] is plotted versus time.Therefore,this is a ________ order reaction.

Correct Answer
verified