The elementary reaction HBr(g)+ Br(g)→ H(g)+ Br2 (g)is endothermic.

Would you expect the rate constant for t

Consider the reaction 2NH3(g)→ N2(g)+ 3 H2 (g) If the rate Δ[H2]/Δt is 0.030 mol L-1 • s-1,what is Δ[N H3]/Δt?

A) -0.045 mol L-1• s-1 B) -0.030 mol L-1• s-1 C) -0.020 mol L-1• s-1 D) -0.010 mol L-1• s-1 E) None of these choices is correct. A) -0.045 mol L-1• s-1 B) -0.030 mol L-1• s-1 C) -0.020 mol L-1• s-1 D) -0.010 mol L-1• s-1 E) None of these choices is correct.

The rate law for the reaction H2O2 + 2H+ + 2I- → I2 + 2H2O is rate = k[H2O2][I-].The following mechanism has been suggested. H2O2 + I- → HOI + OH- (slow) OH- + H+ → H2O (fast) HOI + H+ + I- → I2 + H2O (fast) Identify all intermediates included in this mechanism.

A) H+and I- B) H+ and HOI C) HOI and OH- D) H+only E) H2O and OH- A) H+and I- B) H+ and HOI C) HOI and OH- D) H+only E) H2O and OH-

A rate constant obeys the Arrhenius equation,the factor A being 2.2 × 1013 s-1 and the activation energy being 150.kJ mol-1.What is the value of the rate constant at 227°C? (R = 8.314 J/mol• K)

A) 2.1 × 1013 s-1 B) 6.7 × 10-22 s-1 C) 1.5 × 1011 s-1 D) 4.7 × 10-3 s-1 E) 1.0 × 1029 s-1 A) 2.1 × 1013 s-1 B) 6.7 × 10-22 s-1 C) 1.5 × 1011 s-1 D) 4.7 × 10-3 s-1 E) 1.0 × 1029 s-1

Exam 14: Chemical Kinetics

The following is an Arrhenius plot of a first-order reaction.The rate constant is measured in units of s^-1. If a catalyst is added to the reaction,which could correspond to an Arrhenius plot of the catalyzed reaction?

(Multiple Choice)

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Question 21

The elementary reaction HBr(g)+ Br(g)→ H(g)+ Br₂ (g)is endothermic.

(Essay)

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Question 22

A first-order reaction has a rate constant of 7.5 × 10^-3 s^-1.The time required for the reaction to be 60% complete is?

(Multiple Choice)

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Question 23

Consider the reaction 2NH₃(g)→ N₂(g)+ 3 H₂ (g) If the rate Δ[H₂]/Δt is 0.030 mol L^-1 • s^-1,what is Δ[N H₃]/Δt?

(Multiple Choice)

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Question 24

______________ describes the reaction rate as being directly proportional to the number of molecular collisions per second.

(Short Answer)

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Question 25

A catalyst increases the rate of the reaction and is recovered completely at the end of the reaction.

(True/False)

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Question 26

What statement below best describes the graph representing the integrated second-order rate law?

(Multiple Choice)

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Question 27

The intermediate in a reaction appears in the mechanism of the reaction and in the overall balanced equation.

(True/False)

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Question 28

Consider the following potential energy profile for the A → B reaction.How many elementary steps are there?

(Multiple Choice)

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Question 29

A certain first-order reaction A → B is 25% complete in 42 min at 25°C.What is its rate constant?

(Multiple Choice)

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Question 30

The reaction A + 2B → products was found to have the rate law,rate = k[A][B]².Predict by what factor the rate of reaction will increase when the concentration of A is doubled and the concentration of B is also doubled.

(Multiple Choice)

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Question 31

The reaction A + 2B → products has the rate law,rate = k[A][B]³.If the concentration of B is doubled while that of A is unchanged,by what factor will the rate of reaction increase?

(Multiple Choice)

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Question 32

For the overall chemical reaction shown below,which one of the following statements can be rightly assumed? 2 H₂S(g)+ O₂(g)→ 2S(s)+ 2H₂O(l)

(Multiple Choice)

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Question 33

The rate constant for a reaction is 4.65 L • mol^-1 • s^-1.What is the overall order of the reaction?

(Multiple Choice)

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Question 34

The following diagram represents the second-order decomposition of A to form X according to the following balanced chemical equation: A → X.Each sphere represents 1.0 mmol of atoms,and the volume of the box is 1.0 L. What is the half-life of the reaction?

(Multiple Choice)

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Question 35

The rate law for the reaction H₂O₂ + 2H⁺ + 2I^- → I₂ + 2H₂O is rate = k[H₂O₂][I^-].The following mechanism has been suggested. H₂O₂ + I^- → HOI + OH^- (slow) OH^- + H⁺ → H₂O (fast) HOI + H⁺ + I^- → I₂ + H₂O (fast) Identify all intermediates included in this mechanism.

(Multiple Choice)

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Question 36

A rate constant obeys the Arrhenius equation,the factor A being 2.2 × 10¹³ s^-1 and the activation energy being 150.kJ mol^-1.What is the value of the rate constant at 227°C? (R = 8.314 J/mol• K)

(Multiple Choice)

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Question 37

A _-__________ is a reaction whose rate depends on the concentration of one of the reactants raised to the first power.

(Short Answer)

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Question 38

A(n)_______________ increases the reaction rate without being consumed.

(Short Answer)

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Question 39

The _______________ is the rate for a specific instant in time.

(Short Answer)

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Question 40

Showing 21 - 40 of 114

Exam 14: Chemical Kinetics

The following is an Arrhenius plot of a first-order reaction.The rate constant is measured in units of s-1. If a catalyst is added to the reaction,which could correspond to an Arrhenius plot of the catalyzed reaction?

The elementary reaction HBr(g)+ Br(g)→ H(g)+ Br2 (g)is endothermic.

A first-order reaction has a rate constant of 7.5 × 10-3 s-1.The time required for the reaction to be 60% complete is?

Consider the reaction 2NH3(g)→ N2(g)+ 3 H2 (g) If the rate Δ[H2]/Δt is 0.030 mol L-1 • s-1,what is Δ[N H3]/Δt?

______________ describes the reaction rate as being directly proportional to the number of molecular collisions per second.

A catalyst increases the rate of the reaction and is recovered completely at the end of the reaction.

What statement below best describes the graph representing the integrated second-order rate law?

The intermediate in a reaction appears in the mechanism of the reaction and in the overall balanced equation.

Consider the following potential energy profile for the A → B reaction.How many elementary steps are there?

A certain first-order reaction A → B is 25% complete in 42 min at 25°C.What is its rate constant?

The reaction A + 2B → products was found to have the rate law,rate = k[A][B]2.Predict by what factor the rate of reaction will increase when the concentration of A is doubled and the concentration of B is also doubled.

The reaction A + 2B → products has the rate law,rate = k[A][B]3.If the concentration of B is doubled while that of A is unchanged,by what factor will the rate of reaction increase?

For the overall chemical reaction shown below,which one of the following statements can be rightly assumed? 2 H2S(g)+ O2(g)→ 2S(s)+ 2H2O(l)

The rate constant for a reaction is 4.65 L • mol-1 • s-1.What is the overall order of the reaction?

The following diagram represents the second-order decomposition of A to form X according to the following balanced chemical equation: A → X.Each sphere represents 1.0 mmol of atoms,and the volume of the box is 1.0 L. What is the half-life of the reaction?

The rate law for the reaction H2O2 + 2H+ + 2I- → I2 + 2H2O is rate = k[H2O2][I-].The following mechanism has been suggested. H2O2 + I- → HOI + OH- (slow) OH- + H+ → H2O (fast) HOI + H+ + I- → I2 + H2O (fast) Identify all intermediates included in this mechanism.

A rate constant obeys the Arrhenius equation,the factor A being 2.2 × 1013 s-1 and the activation energy being 150.kJ mol-1.What is the value of the rate constant at 227°C? (R = 8.314 J/mol• K)

A _________-__________________ is a reaction whose rate depends on the concentration of one of the reactants raised to the first power.

A(n)_______________ increases the reaction rate without being consumed.

The _______________ is the rate for a specific instant in time.

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The following is an Arrhenius plot of a first-order reaction.The rate constant is measured in units of s^-1. If a catalyst is added to the reaction,which could correspond to an Arrhenius plot of the catalyzed reaction?

The elementary reaction HBr(g)+ Br(g)→ H(g)+ Br₂ (g)is endothermic.

A first-order reaction has a rate constant of 7.5 × 10^-3 s^-1.The time required for the reaction to be 60% complete is?

Consider the reaction 2NH₃(g)→ N₂(g)+ 3 H₂ (g) If the rate Δ[H₂]/Δt is 0.030 mol L^-1 • s^-1,what is Δ[N H₃]/Δt?

The reaction A + 2B → products was found to have the rate law,rate = k[A][B]².Predict by what factor the rate of reaction will increase when the concentration of A is doubled and the concentration of B is also doubled.

The reaction A + 2B → products has the rate law,rate = k[A][B]³.If the concentration of B is doubled while that of A is unchanged,by what factor will the rate of reaction increase?

For the overall chemical reaction shown below,which one of the following statements can be rightly assumed? 2 H₂S(g)+ O₂(g)→ 2S(s)+ 2H₂O(l)

The rate constant for a reaction is 4.65 L • mol^-1 • s^-1.What is the overall order of the reaction?

A rate constant obeys the Arrhenius equation,the factor A being 2.2 × 10¹³ s^-1 and the activation energy being 150.kJ mol^-1.What is the value of the rate constant at 227°C? (R = 8.314 J/mol• K)

A _-__________ is a reaction whose rate depends on the concentration of one of the reactants raised to the first power.