Answer
Compound
Work Step by Step
It is higher in mass than the original black substance, so it is clear that a compound was formed.
Chemistry: The Molecular Science (5th Edition)
by Moore, John W.; Stanitski, Conrad L.
Published by
Cengage Learning
ISBN 10:
1285199049
ISBN 13:
978-1-28519-904-7
Chapter 1 - The Nature of Chemistry - Questions for Review and Thought - Topical Questions - Page 41c: 44b
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