Answer
Because CaCl$_2$ is an Ionic compound.
Work Step by Step
This is an ionic compound. Prefixes such as di and tri are only used for covalent compounds.
Chemistry 9th Edition
by Zumdahl, Steven S.; Zumdahl, Susan A.
Published by
Cengage Learning
ISBN 10:
1133611095
ISBN 13:
978-1-13361-109-7
Chapter 2 - Atoms, Molecules, and Ions - Active Learning Questions - Page 73: 12
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