Answer
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Work Step by Step
a) Combustions are always exothermic, they always release heat.
b) Decompositions are usually endothermic since energy is required to break the molecular bonds.
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Chapter 5 Principles of Chemical Reactivity: Energy and Chemical Reactions - Study Questions - Page 217h: 101
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