Biology 2010 Student Edition

Published by Prentice Hall
ISBN 10: 9780133669510
ISBN 13: 978-0-13366-951-0

Chapter 2, The Chemistry of Life - Assessment - 2.4 Chemical Reactions and Enzymes - Understand Key Concepts/Think Critically - Page 57: 27


Reactions can release energy or absorb energy.

Work Step by Step

In a chemical reaction that absorbs energy, a source of energy is needed to initiate the reaction; otherwise, the reaction will not happen. This occurs in the hydrolysis of water where an electric current is run through water to separate it into its components hydrogen and oxygen. A chemical reaction that releases energy will produce energy (commonly, heat energy) when two substances come together.
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