Physical Chemistry
Physical Chemistry
2nd Edition
ISBN: 9781133958437
Author: Ball, David W. (david Warren), BAER, Tomas
Publisher: Wadsworth Cengage Learning,
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Chapter 22, Problem 22.44E

Are the following processes examples of homogeneous or heterogeneous catalysis? (a) Hydrolysis of immiscible ethyl acetate ( l ) in an aqueous basic solution. (b) Conversion of NO X gases to N 2 and O 2 by platinum metal. (c) Decomposition of atmospheric ozone by NO gas. (d) Oxidation of ethyl alcohol, C 2 H 5 OH , by the enzyme alcohol dehydrogenase, ADH, to acetaldehyde in the body. (e) Solid-state conversion of C (graphite) to C (diamond) by transition metal additives at high pressure.

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In a study of the formation of HI from its elements, H2(g) + 12(g) == 2HI(g) equal amounts of H2 and 12 were placed in a container, which was then sealed and heated. (a) On one set of axes, sketch concentration vs. time curves for H and HI, and explain how Q changes as a function of time. (b) Is the value of Q different if [12] is plotted instead of [H2]?
(a) Explain the meaning of the sentence:“The velocity laws of reactions are empirical” (b) It can be determined that the velocity law of a generic reaction A +B→Pév = k[A]x[B]y. Plot on a graph the variation of [A] and [P] with time, and explain why v= d[P]/dt = -d[A]/dt. (c) Explain the meaning of the terms k, x and y, in the velocity law, presented in item b: (d) Explain what it means in practice for a velocity law to be of zero order. Plot ,A as a function of t, for the zero-order reaction A→Products. (e) Explain what elementary reactions are and how they can be classified.
Suppose that the gas-phase reaction 2 NO(g) + O₂(g) →2 NO₂ (g) were carried out in a constant- volume container at constant temperature.
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