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.
Chemistry: A Molecular Approach (3rd Edition)
by Tro, Nivaldo J.
Published by
Prentice Hall
ISBN 10:
0321809246
ISBN 13:
978-0-32180-924-7
Chapter 6 - Sections 6.1-6.10 - Exercises - Conceptual Problems - Page 293: 131
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