Chemistry: A Molecular Approach (3rd Edition)

Published by Prentice Hall
ISBN 10: 0321809246
ISBN 13: 978-0-32180-924-7

Chapter 1 - Sections 1.1-1.8 - Exercises - Problems by Topic: 33b

Answer

Observation.

Work Step by Step

The statement "When iron rusts in a closed container, the mass of the container and its contents does not change" is an observation, as the process mentioned can be observed by experimentation.
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