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: 1.17

Answer

A=compound B=not as certain, but likely a compound. C=compound

Work Step by Step

We know that A gives off the gas C when heated w/o oxygen, and that gas C is actually C$O_{2}$. This means that A and C are both compounds, as A has to have at least carbon and oxygen in it to begin with. Substance B isn't as certain, but very few elements naturally occur as white solids, so it is very likely substance B is a compound.
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