Chemistry 9th Edition

Published by Cengage Learning
ISBN 10: 1133611095
ISBN 13: 978-1-13361-109-7

Chapter 6 - Thermochemistry - Review Questions - Page 284: 2


Plot a represent an exothermic reaction. The reactants have weaker bonds. In plot b, reactants must gain potential energy from the surroundings such enthalpy.

Work Step by Step

An exothermic reaction represents a decrease in potential energy from reactants to products. Therefore, plot A which depicts a loss of potential energy from reactants to products represents an exothermic reaction. Weaker bonds are associated with higher potential energies. Therefore, the reactants in plot a have weaker bonds as they have a higher potential energy. By the Law of Conservation of Energy, the reactants must receive the energy from the surroundings in an endothermic process.
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