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Exam 15: Chemical Kinetics

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Question 21

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A general reaction written as 2A + 2B  C + 2D is studied and yields the following data. -What is the numerical value of the rate constant?

A) 4.00  10^-1
B) 4.00  10^-2
C) 4.00  10^-3
D) 4.00  10^-4
E) none of these

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Question 22

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The following questions refer to the hypothetical reaction A + B  products. The kinetics data given can be analyzed to answer the questions. -What form will the pseudo-rate law have?

A) Rate = kk'[A]^x
B) Rate = k'[A]^x[B]^y
C) Rate = kk'[B]^y
D) Rate = k'[B]^y
E) Rate = k'[A]^x

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Question 23

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The following questions refer to the gas-phase decomposition of chloroethane: C₂H₅Cl $\rightarrow$ products Experiment shows that the decomposition is first order. The following data show kinetics information for this reaction. -What would the concentration be after 5.0 s?

The oxidation of Cr³⁺ to CrO₄^2- can be accomplished using Ce⁴⁺ in a buffered solution. The following data were obtained: -Determine the order in the rate law of the species Ce⁴⁺.

For the reaction 2A + B $\rightarrow$ products the following mechanism is proposed: A + B M A + M $\rightarrow$ products Assuming that the second step is the rate-determining step and the first step is a fast equilibrium step, determine the rate law. Represent the rate constant in terms of k₁, k_-1, and k₂.

The following questions refer to the hypothetical reaction A + B  products. The kinetics data given can be analyzed to answer the questions. -The rate expression for a particular reaction is Rate = k[A][B]³. If the initial concentration of B is increased from 0.2 M to 0.6 M, the initial rate will increase by which of the following factors?

The following questions refer to the reaction 2A₂ + B₂ $\rightarrow$ 2C. The mechanism below has been proposed: -Which step(s) is(are) rate-determining?

Raw milk sours in 4.0 h at 28°C but takes 48 h to sour in a refrigerator at 5°C. Calculate the activation energy for the souring of milk.

A student was trying to determine the order of a chemical reaction. To accomplish this, the student graphed the concentration - time data using various plotting methodologies. The plots are shown below. What is the order of the reaction?

For the reaction 2N₂O₅(g) $\rightarrow$ O₂(g) + 4NO₂(g) the half-life is a constant 693 s at 45° C. A) Some N₂O₅ at 5.0 *10^-2 atm is placed into a sealed container at 45° C. Calculate the total pressure in the flask after 1.0 * 10² s has elapsed. B) For the reaction above, the half-life at 65° C is a constant 70.7 s. Calculate the activation energy for this reaction.

If the reaction 2HI $\rightarrow$ H₂ + I₂ is second order, which of the following will yield a linear plot?

For the reaction 2NO(g) + H₂(g) $\rightarrow$ N₂O(g) + H₂O(g) two mechanisms, A and B, have been proposed. Derive the rate law for each proposed mechanism for the production of N₂O. For mechanism B, use the steady-state approximation. Let rate

The experimental rate law for the decomposition of nitrous oxide (N₂O) to N₂ and O₂ is Rate = k[N₂O]². Two mechanisms are proposed: I. N₂O $\rightarrow$ N₂ + O N₂O + O $\rightarrow$ N₂ + O₂ II) 2N₂O N₄O₂ N₄O₂ $\rightarrow$ 2N₂ + O₂ Which of the following could be a correct mechanism?

Consider the reaction 3A + B + C $\rightarrow$ D + E Where the rate law is defined as An experiment is carried out where [B]₀ = [C]₀ = 1.00 M and [A]₀ = 2.46 *10^-4 M. After 2.96 min, [A] = 3.30 *10^-5 M. What is the value of k?

The reaction 2H₂O₂ $\rightarrow$ 2H₂O + O₂ has the following mechanism: H₂O₂ + I^- $\rightarrow$ H₂O + IO^- H₂O + IO^- $\rightarrow$ H₂O + O₂ + I^- What is the catalyst in the reaction?

Consider the reaction 3A + B + C $\rightarrow$ D + E Where the rate law is defined as (1.66 * 10² L³/mol³ • s) [A]²[B][C] An experiment is carried out where [B]₀ = [C]₀ = 1.00 M and [A]₀ = 2.72 * 10^-4 M. What is the half-life for this experiment?

The following initial rate data were found for the reaction 2MnO₄^- + 5H₂C₂O₄ + 6H⁺  2Mn²⁺ + 10CO₂ + 8H₂O -For which order reaction is the half-life of the reaction independent of the initial concentration of the reactant(s) ?

For the reaction in which A and B react to form C, the following initial rate data were obtained. What is the rate law for the reaction?

Use the potential energy diagram shown to answer the following questions. -Which letter shows the activation energy using a catalyst?

The following questions refer to the hypothetical reaction A + B  products. The kinetics data given can be analyzed to answer the questions. -The rate law for the reaction is Rate = k[A]^x[B]^y. What are the values of x and y?