Chemistry: A Molecular Approach (3rd Edition)

Published by Prentice Hall
ISBN 10: 0321809246
ISBN 13: 978-0-32180-924-7

Chapter 6 - Sections 6.1-6.10 - Exercises - Conceptual Problems: 131

Answer

Choice D.

Work Step by Step

$\Delta$$E_{system}$ is positive whenever the reactants are a lower internal energy than the products. Therefore, energy flows into the systems from the surrounding and therefore the answer is D.
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