Chemistry 9th Edition

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

Chapter 6 - Thermochemistry - Review Questions: 2

Answer

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.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.