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Exam 14: Chemical Kinetics: Reactions in the Air We Breathe

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Question 71

Multiple Choice

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The reaction profiles for four reactions are shown below. Which one has the largest activation energy?

A) I
B) II
C) III
D) IV

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Question 72

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Which of the following plots indicates that the reaction is zero order?

A)
B)
C)
D)

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Question 73

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The energy profiles for four different reactions are shown below. The scales are the same for each. Which of the reactions will have the smallest rate constant?

A proposed mechanism for the decomposition of ozone in the stratosphere is: Step 1: Cl(g) + O₃(g) $\rightarrow$ ClO(g) + O₂(g) Step 2: ClO(g) + O₃(g) $\rightarrow$ Cl(g) + 2 O₂(g) What is the molecularity of step 2?

Large cities often issue ozone advisories. At what time of year would an advisory be likely to occur most often?

For the reaction 2A + 3B $\rightarrow$ 4C + 5D, the rate of the reaction in terms of $\Delta$ B would be written as ________

A scientist conducts an experiment to determine the rate of the following reaction: N₂(g) + O₂(g) $\rightarrow$ 2NO(g) If the initial concentration of NO was 0.00 M and the concentration of NO was 0.050 M after 0.100 s, what is the average rate of the reaction?

The steps in a reaction mechanism are as follows. Which species is acting as a catalyst? Step 1: Ag⁺(aq) + Ce⁴⁺(aq) $\leftrightarrow$ Ag²⁺(aq) + Ce³⁺(aq) Step 2: Tl⁺(aq) + Ag²⁺(aq) $\rightarrow$ Tl²⁺(aq) + Ag⁺(aq) Step 3: Tl²⁺(aq) + Ce⁴⁺(aq) $\rightarrow$ Tl³⁺(aq) + Ce³⁺(aq)

The linear form of ________ is very useful, as it allows us to calculate the activation energy and the frequency factor.

A catalyst that is in a different phase from the reactants and products is a(n) ________ catalyst.

The following figure shows Arrhenius plots for four different reactions. Which reaction has the lowest activation energy?

For the reaction 2A + 3B $\rightarrow$ 4C + 5D, the rate of the reaction in terms of $\Delta$ A would be written as ________.

Smog created by the interaction of sunlight with nitrogen oxides and volatile organic compounds is termed ________ smog.

The device in automobiles that has decreased NO and partially oxidized hydrocarbons from exhaust gases is termed a(n) ________.

For the rate law Rate = k[A][B]^3/2, the partial order with respect to A is ________, the partial order with respect to B is ________, and the total order is ________.

One reaction that occurs in an automobile catalytic converter is the conversion of nitrogen monoxide to nitrogen and oxygen. How could the rate of this reaction be expressed correctly in terms of the rate at which the concentration of a reactant or product changes? 2NO(g) $\rightarrow$ N₂(g) + O₂(g)

The energy profiles for four different reactions are shown below. The scales are the same for each. Which of the reactions will have the largest rate constant?

For the rate law Rate = k[A]^3/2[B], the partial order with respect to A is ________, the partial order with respect to B is ________, and the total order is ________.

Given the following data, determine the order of the reaction with respect to Cl₂. 2NO(g) + Cl₂(g) $\rightarrow$ 2NOCl(g) $\begin{array}{cccc}\text { Experiment } & {[\mathbf{N O}](\boldsymbol{M}) } & {\left[\mathrm{Cl}_{\mathbf{2}}\right](\boldsymbol{M}) } & \text { Rate }(\boldsymbol{M} / \mathbf{s}) \\1 & 0.0300 & 0.0100 & 3.4 \times 10^{-4} \\2 & 0.0150 & 0.0100 & 8.5 \times 10^{-5} \\3 & 0.0150 & 0.0400 & 3.4 \times 10^{-4}\end{array}$

Which of the following plots indicates that the reaction is second order?