In aqueous solution,hypobromite ion,BrO-,reacts to produce bromate ion,BrO3-,and bromide ion,Br-,according to the following chemical equation. 3 BrO-(aq)→ BrO3-(aq)+ 2 Br-(aq) A plot of 1/[BrO-] vs.time is linear and the slope is equal to 0.056 M-1s-1.If the initial concentration of BrO- is 0.80 M,how long will it take one-half of the BrO- ion to react?

A) 4)5 × 10-2 s B) 7)1 s C) 12 s D) 22 s A) 4)5 × 10-2 s B) 7)1 s C) 12 s D) 22 s

The relative initial rates of the reaction AS1U1B12S1U1B0 + BS1U1B12S1U1B0 → products in vessels (a)-(d)are 1:1:4:4.Unshaded spheres represent AS1U1B12S1U1B0 molecules,and shaded spheres represent BS1U1B12S1U1B0 molecules present at the beginning of the reaction. -What is the rate law for this reaction?

A) Rate = k[A2]2 B) Rate = k[B2]2 C) Rate = k[A2][B2] D) Rate = k[A2]2[B2]2 A) Rate = k[A2]2 B) Rate = k[B2]2 C) Rate = k[A2][B2] D) Rate = k[A2]2[B2]2

The decomposition of dinitrogen pentoxide is described by the chemical equation 2 N2O5(g)→ 4 NO2(g)+ O2(g) If the rate of appearance of O2 is equal to 3.00 mol/min at a particular moment,what is the rate of disappearance of N2O5 at that moment?

A) 0)750 mol/min B) 1)50 mol/min C) 6)00 mol/min D) 12.0 mol/min A) 0)750 mol/min B) 1)50 mol/min C) 6)00 mol/min D) 12.0 mol/min

An experiment with 55Co takes 47.5 hours.At the end of the experiment,1.90 ng of 55Co remains.If the half life is 18.0 hours,how many ng of 55Co were originally present?

A) 2)47 ng B) 3)05 ng C) 3)28 ng D) 11.8 ng A) 2)47 ng B) 3)05 ng C) 3)28 ng D) 11.8 ng

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?

A) A2X B) X2 C) XY D) Y A) A2X B) X2 C) XY D) Y

Consider a reaction that occurs by the following one-step mechanism: AS1U1B12S1U1B0 + BS1U1B12S1U1B0 → 2 AB The potential energy profile for this reaction is shown below. -What is the species present at reaction stage 3?

A) an intermediate B) a product C) a reactant D) a transition state A) an intermediate B) a product C) a reactant D) a transition state

Exam 12: Chemical Kinetics

In aqueous solution,hypobromite ion,BrO^-,reacts to produce bromate ion,BrO₃^-,and bromide ion,Br^-,according to the following chemical equation. 3 BrO^-(aq)→ BrO₃^-(aq)+ 2 Br^-(aq) A plot of 1/[BrO^-] vs.time is linear and the slope is equal to 0.056 M^-1s^-1.If the initial concentration of BrO^- is 0.80 M,how long will it take one-half of the BrO^-ion to react?

(Multiple Choice)

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Question 121

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 rate law for this reaction?

(Multiple Choice)

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Question 122

The reaction shown below has the rate law: Rate = k[BrO₃^-][Br^-][H⁺]².The order of reaction with respect to H⁺ is and the overall order is . BrO₃^-(aq)+ 5 Br^-(aq)+ 6 H⁺(aq)→ 3 Br₂(aq)+ 3 H₂O(l)

(Short Answer)

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Question 123

-What is the activation energy for the destruction of ozone?

(Multiple Choice)

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Question 124

What is the overall reaction order for the reaction that has the rate law: Rate = k[H₂][NO]²?

(Multiple Choice)

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Question 125

The following reaction is first order: C₂H₆ → 2 CH₃.If the rate constant is equal to 5.5 × 10^-4 s^-1 at 1000 K,how long will it take for 0.35 mol of C₂H₆ in a 1.00 L container to decrease to 0.10 mol in the same container?

(Multiple Choice)

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Question 126

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?

(Multiple Choice)

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Question 127

Hydrochloric acid in the hydrolysis of an ester to form an alcohol and a carboxylic acid is an example of a ________ (heterogeneous,homogeneous)catalyst.

(Short Answer)

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Question 128

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

(Short Answer)

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Question 129

The decomposition of dinitrogen pentoxide is described by the chemical equation 2 N₂O₅(g)→ 4 NO₂(g)+ O₂(g) If the rate of appearance of O₂ is equal to 3.00 mol/min at a particular moment,what is the rate of disappearance of N₂O₅ at that moment?

(Multiple Choice)

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Question 130

has a decay constant,k = 1.209 × 10^-4 yr^-1 and a half-life of ________ years.

(Short Answer)

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Question 131

The rate-determining step in a reaction is shown below.The molecularity of this reaction is ________. NO₂(g)+ NO₂(g)→ NO(g)+ NO₃(g)

(Short Answer)

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Question 132

An experiment with ⁵⁵Co takes 47.5 hours.At the end of the experiment,1.90 ng of ⁵⁵Co remains.If the half life is 18.0 hours,how many ng of ⁵⁵Co were originally present?

(Multiple Choice)

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Question 133

-Which of the elementary reactions shown above has a molecularity of two?

(Multiple Choice)

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Question 134

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?

(Multiple Choice)

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Question 135

A reaction occurs by a two-step mechanism,shown below. Step 1: AX₂(g)→ AX(g)+ X(g) Step 2: AX₂(g)+ X(g)→ AX + X₂(g) The intermediate in this reaction is ,and the molecularity of the second step is .

(Short Answer)

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Question 136

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?

(Multiple Choice)

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Question 137

For the reaction shown below,the rate of reaction of Br^- is ________ times the rate of formation of Br₂ over the same time period. ClO₂^-(aq)+ 4 Br^-(aq)+ 4 H⁺(aq)→ Cl^-(aq)+ 2 Br₂(aq)+2 H₂O(l)

(Short Answer)

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Question 138

The following reaction is second order in A and first order in B: A + B → Products Rate = k[A]²[B] What is the rate constant k of this reaction in vessel (b)relative to the rate constant k of this reaction in vessel (a)? Each vessel has the same volume.Shaded spheres represent A molecules,and unshaded spheres represent B molecules.

(Multiple Choice)

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Question 139

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 3?

(Multiple Choice)

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Question 140

Showing 121 - 140 of 206

Exam 12: Chemical Kinetics

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 rate law for this reaction?

The reaction shown below has the rate law: Rate = k[BrO3-][Br-][H+]2.The order of reaction with respect to H+ is ________ and the overall order is ________. BrO3-(aq)+ 5 Br-(aq)+ 6 H+(aq)→ 3 Br2(aq)+ 3 H2O(l)

-What is the activation energy for the destruction of ozone?

What is the overall reaction order for the reaction that has the rate law: Rate = k[H2][NO]2?

The following reaction is first order: C2H6 → 2 CH3.If the rate constant is equal to 5.5 × 10-4 s-1 at 1000 K,how long will it take for 0.35 mol of C2H6 in a 1.00 L container to decrease to 0.10 mol in the same container?

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?

Hydrochloric acid in the hydrolysis of an ester to form an alcohol and a carboxylic acid is an example of a ________ (heterogeneous,homogeneous)catalyst.

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

The decomposition of dinitrogen pentoxide is described by the chemical equation 2 N2O5(g)→ 4 NO2(g)+ O2(g) If the rate of appearance of O2 is equal to 3.00 mol/min at a particular moment,what is the rate of disappearance of N2O5 at that moment?

has a decay constant,k = 1.209 × 10-4 yr-1 and a half-life of ________ years.

The rate-determining step in a reaction is shown below.The molecularity of this reaction is ________. NO2(g)+ NO2(g)→ NO(g)+ NO3(g)

An experiment with 55Co takes 47.5 hours.At the end of the experiment,1.90 ng of 55Co remains.If the half life is 18.0 hours,how many ng of 55Co were originally present?

-Which of the elementary reactions shown above has a molecularity of two?

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?

A reaction occurs by a two-step mechanism,shown below. Step 1: AX2(g)→ AX(g)+ X(g) Step 2: AX2(g)+ X(g)→ AX + X2(g) The intermediate in this reaction is ________,and the molecularity of the second step is ________.

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?

For the reaction shown below,the rate of reaction of Br- is ________ times the rate of formation of Br2 over the same time period. ClO2-(aq)+ 4 Br-(aq)+ 4 H+(aq)→ Cl-(aq)+ 2 Br2(aq)+2 H2O(l)

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 3?

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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 rate law for this reaction?

The reaction shown below has the rate law: Rate = k[BrO₃^-][Br^-][H⁺]².The order of reaction with respect to H⁺ is and the overall order is . BrO₃^-(aq)+ 5 Br^-(aq)+ 6 H⁺(aq)→ 3 Br₂(aq)+ 3 H₂O(l)

What is the overall reaction order for the reaction that has the rate law: Rate = k[H₂][NO]²?

The following reaction is first order: C₂H₆ → 2 CH₃.If the rate constant is equal to 5.5 × 10^-4 s^-1 at 1000 K,how long will it take for 0.35 mol of C₂H₆ in a 1.00 L container to decrease to 0.10 mol in the same container?

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?

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

The decomposition of dinitrogen pentoxide is described by the chemical equation 2 N₂O₅(g)→ 4 NO₂(g)+ O₂(g) If the rate of appearance of O₂ is equal to 3.00 mol/min at a particular moment,what is the rate of disappearance of N₂O₅ at that moment?

has a decay constant,k = 1.209 × 10^-4 yr^-1 and a half-life of ________ years.

The rate-determining step in a reaction is shown below.The molecularity of this reaction is ________. NO₂(g)+ NO₂(g)→ NO(g)+ NO₃(g)

An experiment with ⁵⁵Co takes 47.5 hours.At the end of the experiment,1.90 ng of ⁵⁵Co remains.If the half life is 18.0 hours,how many ng of ⁵⁵Co were originally present?

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?

A reaction occurs by a two-step mechanism,shown below. Step 1: AX₂(g)→ AX(g)+ X(g) Step 2: AX₂(g)+ X(g)→ AX + X₂(g) The intermediate in this reaction is ,and the molecularity of the second step is .

For the reaction shown below,the rate of reaction of Br^- is ________ times the rate of formation of Br₂ over the same time period. ClO₂^-(aq)+ 4 Br^-(aq)+ 4 H⁺(aq)→ Cl^-(aq)+ 2 Br₂(aq)+2 H₂O(l)

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 3?