Chemistry: The Molecular Nature of Matter and Change 7th Edition

Published by McGraw-Hill Education
ISBN 10: 007351117X
ISBN 13: 978-0-07351-117-7

Chapter 2 - Problems: 2.3

Answer

A material that is composed of only one type of particle is a pure substance. Calcium chloride consists of calcium and chlorine, in a fixed mass ratio, so it is not a pure substance. Sulfur consists of sulfur atoms combined into octatomic molecules is a pure substance. Baking powder containing sodium hydrogen carbonate and calcium dihydrogen phosphate is not a pure substance. Cytosine, a component of DNA, consists of H, C, N, and O atoms bonded in a specific arrangement and is not a pure substance.

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