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.
Chemistry: A Molecular Approach (3rd Edition)
by Tro, Nivaldo J.
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 - Page 37: 33b
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