Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 1 - Introduction: Matter and Measurement - Exercises: 1.21d

Answer

Digesting a candy bar is a chemical change.

Work Step by Step

During physical changes, the substance changes its physical appearance, but not its chemical composition. This includes things like physical observations (color, texture) melting and boiling points, density, and state. Chemical changes involve a transformation of one substance into a chemically different substance. This means that changes that involve other substances will tend to be chemical changes. This question asks us to determine whether a change is physical or chemical. The specific change is digesting a candy bar. When this happens, stomach acid is breaking down the candy into its base molecules. This means it becomes chemically different, making it a chemical change.
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