Base your answers to questions 37 through 40 on the potential energy diagram below. 100- 80 -Uncatalyzed reaction curve 60 -Catalyzed reaction curve 40 20 Reaction Coordinate Practice 39 What is the heat of reaction (AH) for the reverse catalyzed reaction? 1) + 20 kJ 2) - 20 kJ Practice 37 Which statement correctly describes the potential energy changes that occur in the forward uncatalyzed reaction? 1) The activation energy is 40 kJ and a AH of +20 kJ. 2) The activation energy is 40 kJ and a AH of -20 kJ. 3) The activation energy is 60 kJ and a AH of +20 kJ. 4) The activation energy is 60 kJ and a AH of -20 kJ. 3) +40 kJ 4) - 40 kJ Practice 40 What is the energy of the activated complex for the uncatalyzed reaction? 1) 20 kj 2) 40 kJ Practice 38 Which reaction requires the lowest amount of activation energy? 1) Forward uncatalyzed reaction. 2) Forward catalyzed reaction. 3) Reverse uncatalyzed reaction. 4) Reverse catalyzed reaction. 3) 60 kJ 4) 80 kJ Potential Energy (kJ)

Base your answers to questions 37 through 40 on the potential energy diagram below. 100- 80 -Uncatalyzed reaction curve 60 -Catalyzed reaction curve 40 20 Reaction Coordinate Practice 39 What is the heat of reaction (AH) for the reverse catalyzed reaction? 1) + 20 kJ 2) - 20 kJ Practice 37 Which statement correctly describes the potential energy changes that occur in the forward uncatalyzed reaction? 1) The activation energy is 40 kJ and a AH of +20 kJ. 2) The activation energy is 40 kJ and a AH of -20 kJ. 3) The activation energy is 60 kJ and a AH of +20 kJ. 4) The activation energy is 60 kJ and a AH of -20 kJ. 3) +40 kJ 4) - 40 kJ Practice 40 What is the energy of the activated complex for the uncatalyzed reaction? 1) 20 kj 2) 40 kJ Practice 38 Which reaction requires the lowest amount of activation energy? 1) Forward uncatalyzed reaction. 2) Forward catalyzed reaction. 3) Reverse uncatalyzed reaction. 4) Reverse catalyzed reaction. 3) 60 kJ 4) 80 kJ Potential Energy (kJ)

Chemistry

9th Edition

ISBN:9781133611097

Author:Steven S. Zumdahl

Publisher:Steven S. Zumdahl

Chapter17: Spontaneity, Entropy, And Free Energy

Section: Chapter Questions

Problem 23Q: Monochloroethane (C2H5Cl) can be produced by the direct reaction of ethane gas (C2H6) with chlorine...

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Monochloroethane (C2H5Cl) can be produced by the direct reaction of ethane gas (C2H6) with chlorine gas or by the reaction of ethylene gas (C2H4) with hydrogen chloride gas. The second reaction gives almost a 100% yield of pure C2H5Cl at a rapid rate without catalysis. The first method requires light as an energy source or the reaction would not occur. Yet G for the first reaction is considerably more negative than G for the second reaction. Explain how this can be so.
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