17. At a certain temperature K. = 0.434 for the reaction 2 SO2(8) + 102(g) 2 2 SO3(g). What is the value of K, for the reaction 1 SO3(8) 2 1 SO2(8) + 2 O2(g)? A. K. = 2.30 В. К. - 0.0217 С. К. - 1.15 D. K. = 1.52 18. The reaction 2 SO2(8) + 102(8) 22 SO3(8) is catalyzed by V205, a homogeneous catalyst, and by platinum metal, a heterogeneous catalyst. A similar reaction is catalyzed in our bodies by an enzyme called sulfite oxidase. Which of the following statements concerning catalysts is incorrect? A. Catalysts do not get used up during chemical reactions because they do not actually react, they just bring the reactants together more often and with higher energy. The active site of enzymes like sulfite oxidase lowers the energy of the transition state of the reaction that is being catalyzed. В. C. Catalysts speed up reactions by providing a rate-determining step with a lower activation energy than that of the uncatalyzed reaction. D. Heterogeneous catalysts speed up reactions by absorbing the reactants onto the catalyst surface: this increases the reactivity of the reactants.

17. At a certain temperature K. = 0.434 for the reaction 2 SO2(8) + 102(g) 2 2 SO3(g). What is the value of K, for the reaction 1 SO3(8) 2 1 SO2(8) + 2 O2(g)? A. K. = 2.30 В. К. - 0.0217 С. К. - 1.15 D. K. = 1.52 18. The reaction 2 SO2(8) + 102(8) 22 SO3(8) is catalyzed by V205, a homogeneous catalyst, and by platinum metal, a heterogeneous catalyst. A similar reaction is catalyzed in our bodies by an enzyme called sulfite oxidase. Which of the following statements concerning catalysts is incorrect? A. Catalysts do not get used up during chemical reactions because they do not actually react, they just bring the reactants together more often and with higher energy. The active site of enzymes like sulfite oxidase lowers the energy of the transition state of the reaction that is being catalyzed. В. C. Catalysts speed up reactions by providing a rate-determining step with a lower activation energy than that of the uncatalyzed reaction. D. Heterogeneous catalysts speed up reactions by absorbing the reactants onto the catalyst surface: this increases the reactivity of the reactants.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter17: Spontaneity, Entropy, And Free Energy

Section: Chapter Questions

Problem 121CP: If wet silver carbonate is dried in a stream of hot air. the air must have a certain concentration...

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A gaseous material XY(g) dissociates to some extent to produce X(g) and Y(g): XY(g)X(g)+Y(g) A 2.00-g sample of XY (molar mass = 165 g/mol) is placed in a container with a movable piston at 25C. The pressure is held constant at 0.967 atm. As XY begins to dissociate, the piston moves until 35.0 mole percent of the original XY has dissociated and then remains at a constant position. Assuming ideal behavior, calculate the density of the gas in the container after the piston has stopped moving, and determine the value of K for this reaction of 25C.
The following equilibrium is established in a closed container: C(s)+O2(g)CO2(g)H=393kJmol1 How does the equilibrium shift in response to each of the following stresses? (a) The quantity of solid carbon is increased. (b) A small quantity of water is added, and CO2 dissolves in it. (c) The system is cooled. (d) The volume of the container is increased.
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Show that the complete chemical equation, the total ionic equation, and the net ionic equation for the reaction represented by the equation KI(aq)+I2(aq)KI3(aq) give the same expression for the reaction quotient. KI3 is composed of the ions K+ and I3-.
If wet silver carbonate is dried in a stream of hot air. the air must have a certain concentration level of carbon dioxide to prevent silver carbonate from decomposing by the reaction Ag2CO3(s)Ag2O(s)+CO2(g) H for this reaction is 79.14 kJ/mol in the temperature range of 25 to 125C. Given that the partial pressure of carbon dioxide in equilibrium with pure solid silver carbonate is 6.23 103 torr at 25C, calculate the partial pressure of CO2 necessary to prevent decomposition ofAg2CO3 at 110C. (Hint: Manipulate the equation in Exercise 79.)
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