A particular first-order reaction has a rate constant of 1.35 × 102 s-1 at 25.0 °C. What is the magnitude of k at 65.0 °C if Ea = 55.5 kJ/mol?

A) 1.92 × 103 B) 1.95 × 104 C) 358 D) 3.48 × 1073 E) 1.35 × 102 A) 1.92 × 103 B) 1.95 × 104 C) 358 D) 3.48 × 1073 E) 1.35 × 102

Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO2 → 2NO + O2 In a particular experiment at 300 °C, [NO2] drops from 0.0143 to 0.00701 M in 261 s. The rate of disappearance of NO2 for this period is ________ M/s.

A) 2.79 × 10-5 B) -8.16 × 10-5 C) 5.59 × 10-5 D) 1.40 × 10-5 E) 35,800 A) 2.79 × 10-5 B) -8.16 × 10-5 C) 5.59 × 10-5 D) 1.40 × 10-5 E) 35,800

The decomposition of N2O5 in solution in carbon tetrachloride proceeds via the reaction 2N2O5 (soln) → 4NO2 (soln) + O2 (soln) The reaction is first order and has a rate constant of 4.82 × 10-3 s-1 at 64 °C. The rate law for the reaction is rate = ________.

A) k[N2O5]2 B) k C) k[N2O5] D) k E) 2k[N2O5] A) k[N2O5]2 B) k C) k[N2O5] D) k E) 2k[N2O5]

Exam 14: Chemical Kinetics

The rate constant for a second-order reaction is 0.13 M^-1s^-1. If the initial concentration of reactant is 0.26 mol/L, it takes ________ s for the concentration to decrease to 0.07 mol/L.

(Multiple Choice)

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Question 41

Of the units below, ________ are appropriate for a third-order reaction rate constant.

(Multiple Choice)

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Question 42

Of the following, ________ will lower the activation energy for a reaction.

(Multiple Choice)

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Question 43

The decomposition of N₂O₅ in solution in carbon tetrachloride proceeds via the reaction 2N₂O₅ (soln) → 4NO₂ (soln) + O₂ (soln) The reaction is first order and has a rate constant of 4.82 × 10^-3 s^-1 at 64 °C. If the reaction is initiated with 0.072 mol in a 1.00-L vessel, how many moles remain after 151 s?

(Multiple Choice)

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Question 44

The number of molecules that participate as reactants defines the ________ of the reaction.

(Short Answer)

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Question 45

A particular first-order reaction has a rate constant of 1.35 × 10² s^-1 at 25.0 °C. What is the magnitude of k at 65.0 °C if E_a = 55.5 kJ/mol?

(Multiple Choice)

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Question 46

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

(Multiple Choice)

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Question 47

A flask is charged with 0.124 mol of A and allowed to react to form B according to the reaction A(g)→B(g). The following data are obtained for [A] as the reaction proceeds: -The average rate of appearance of B between 20 s and 30 s is ________ mol/s.

(Multiple Choice)

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Question 48

A catalyst that is present in the same phase as the reacting molecules is called a(n)________ catalyst.

(Short Answer)

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Question 49

Which energy difference in the energy profile below corresponds to the activation energy for the forward reaction?

(Multiple Choice)

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Question 50

If the rate law for the reaction 2A + 3B → products Is second order in A and first order in B, then the rate law is rate = ________.

(Multiple Choice)

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Question 51

Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO₂ → 2NO + O₂ In a particular experiment at 300 °C, [NO₂] drops from 0.0143 to 0.00701 M in 261 s. The rate of disappearance of NO₂ for this period is ________ M/s.

(Multiple Choice)

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Question 52

Which substance in the reaction below either appears or disappears the fastest? 4NH₃ + 7O₂ → 4NO₂ + 6H₂O

(Multiple Choice)

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Question 53

The kinetics of the reaction below were studied and it was determined that the reaction rate increased by a factor of 9 when the concentration of B was tripled. The reaction is ________ order in B. A + B → P

(Multiple Choice)

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Question 54

A catalyst that is present in a different phase from the reacting molecules is called a(n)________ catalyst.

(Short Answer)

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Question 55

The decomposition of N₂O₅ in solution in carbon tetrachloride proceeds via the reaction 2N₂O₅(soln) → 4NO₂(soln) + O₂(soln) The reaction is first order and has a rate constant of 4.82 × 10^-3 s^-1 at 64 °C. The rate law for the reaction is rate = ________.

(Multiple Choice)

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Question 56

A flask is charged with 0.124 mol of A and allowed to react to form B according to the reaction A(g)→B(g). The following data are obtained for [A] as the reaction proceeds: -How many moles of B are present at 30 s?

(Multiple Choice)

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Question 57

The instantaneous rate of a reaction can be read directly from the graph of molarity versus time at any point on the graph.

(True/False)

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Question 58

A second-order reaction has a half-life of 12 s when the initial concentration of reactant is 0.98 M. The rate constant for this reaction is ________ M^-1s^-1.

(Multiple Choice)

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Question 59

Heterogeneous catalysts have different phases from reactants.

(True/False)

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Question 60

Showing 41 - 60 of 134

Exam 14: Chemical Kinetics

The rate constant for a second-order reaction is 0.13 M-1s-1. If the initial concentration of reactant is 0.26 mol/L, it takes ________ s for the concentration to decrease to 0.07 mol/L.

Of the units below, ________ are appropriate for a third-order reaction rate constant.

Of the following, ________ will lower the activation energy for a reaction.

The number of molecules that participate as reactants defines the ________ of the reaction.

A particular first-order reaction has a rate constant of 1.35 × 102 s-1 at 25.0 °C. What is the magnitude of k at 65.0 °C if Ea = 55.5 kJ/mol?

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

A flask is charged with 0.124 mol of A and allowed to react to form B according to the reaction A(g)→B(g). The following data are obtained for [A] as the reaction proceeds: -The average rate of appearance of B between 20 s and 30 s is ________ mol/s.

A catalyst that is present in the same phase as the reacting molecules is called a(n)________ catalyst.

Which energy difference in the energy profile below corresponds to the activation energy for the forward reaction?

If the rate law for the reaction 2A + 3B → products Is second order in A and first order in B, then the rate law is rate = ________.

Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO2 → 2NO + O2 In a particular experiment at 300 °C, [NO2] drops from 0.0143 to 0.00701 M in 261 s. The rate of disappearance of NO2 for this period is ________ M/s.

Which substance in the reaction below either appears or disappears the fastest? 4NH3 + 7O2 → 4NO2 + 6H2O

The kinetics of the reaction below were studied and it was determined that the reaction rate increased by a factor of 9 when the concentration of B was tripled. The reaction is ________ order in B. A + B → P

A catalyst that is present in a different phase from the reacting molecules is called a(n)________ catalyst.

The decomposition of N2O5 in solution in carbon tetrachloride proceeds via the reaction 2N2O5 (soln) → 4NO2 (soln) + O2 (soln) The reaction is first order and has a rate constant of 4.82 × 10-3 s-1 at 64 °C. The rate law for the reaction is rate = ________.

A flask is charged with 0.124 mol of A and allowed to react to form B according to the reaction A(g)→B(g). The following data are obtained for [A] as the reaction proceeds: -How many moles of B are present at 30 s?

The instantaneous rate of a reaction can be read directly from the graph of molarity versus time at any point on the graph.

A second-order reaction has a half-life of 12 s when the initial concentration of reactant is 0.98 M. The rate constant for this reaction is ________ M-1s-1.

Heterogeneous catalysts have different phases from reactants.

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The rate constant for a second-order reaction is 0.13 M^-1s^-1. If the initial concentration of reactant is 0.26 mol/L, it takes ________ s for the concentration to decrease to 0.07 mol/L.

A particular first-order reaction has a rate constant of 1.35 × 10² s^-1 at 25.0 °C. What is the magnitude of k at 65.0 °C if E_a = 55.5 kJ/mol?

Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO₂ → 2NO + O₂ In a particular experiment at 300 °C, [NO₂] drops from 0.0143 to 0.00701 M in 261 s. The rate of disappearance of NO₂ for this period is ________ M/s.

Which substance in the reaction below either appears or disappears the fastest? 4NH₃ + 7O₂ → 4NO₂ + 6H₂O

The decomposition of N₂O₅ in solution in carbon tetrachloride proceeds via the reaction 2N₂O₅(soln) → 4NO₂(soln) + O₂(soln) The reaction is first order and has a rate constant of 4.82 × 10^-3 s^-1 at 64 °C. The rate law for the reaction is rate = ________.

A second-order reaction has a half-life of 12 s when the initial concentration of reactant is 0.98 M. The rate constant for this reaction is ________ M^-1s^-1.