47. The heat content of a system is equal to the enthalpy only for a system that is at constant A. temperature. B. volume. C. pressure. 48. In a first-order reaction, how does the rate change if the concentration of the reactant decreases to one-fourth its original value? A. The rate increases by a factor of one-fourth. B. The rate decreases by a factor of one-fourth. C. The rate stays the same. 49. Why does a catalyst cause a reaction to proceed faster? A. A catalyst increases the frequency of collisions. B. A catalyst increases the total energy of collisions. C. A catalyst decreases the activation energy of reaction. 50. What is the specific heat of a substance if 7600 cal are required to raise the temperature of a 450 g sample by 80°C? A. 0.021 B. 0.99 C. 0.21

47. The heat content of a system is equal to the enthalpy only for a system that is at constant A. temperature. B. volume. C. pressure. 48. In a first-order reaction, how does the rate change if the concentration of the reactant decreases to one-fourth its original value? A. The rate increases by a factor of one-fourth. B. The rate decreases by a factor of one-fourth. C. The rate stays the same. 49. Why does a catalyst cause a reaction to proceed faster? A. A catalyst increases the frequency of collisions. B. A catalyst increases the total energy of collisions. C. A catalyst decreases the activation energy of reaction. 50. What is the specific heat of a substance if 7600 cal are required to raise the temperature of a 450 g sample by 80°C? A. 0.021 B. 0.99 C. 0.21

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

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

PLEASE COMPLETE ALL MSCQ THAN RATING HELPFUL

47. The heat content of a system is equal to the enthalpy only for a system that is
at constant
A. temperature.
B. volume.
C. pressure.
48. In a first-order reaction, how does the rate change if the concentration of the
reactant decreases to one-fourth its original value?
A. The rate increases by a factor of one-fourth.
B. The rate decreases by a factor of one-fourth.
C. The rate stays the same.
49. Why does a catalyst cause a reaction to proceed faster?
A. A catalyst increases the frequency of collisions.
B. A catalyst increases the total energy of collisions.
C. A catalyst decreases the activation energy of reaction.
50. What is the specific heat of a substance if 7600 cal are required to raise the
temperature of a 450 g sample by 80°C?
A. 0.021
B. 0.99
C. 0.21

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