Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning
ISBN 10: 1133949649
ISBN 13: 978-1-13394-964-0

Chapter 1 Basic Concepts of Chemistry - Study Questions - Page 21b: 30


a) Mixture b) Compound c) Mixture d) Mixture

Work Step by Step

a) Air is a mixture of many compounds, predominantly nitrogen ($N_2$) and oxygen ($O_2$). b) Mineral form of Calcium Fluoride ($CaF_2$). c) Brass is a metal alloy of copper (Cu) and zinc (Zn); therefore, it is a mixture. d) 18-carat gold is an alloy of gold: 18 out of 24 parts in mass with the rest being impurities and other metals. Therefore, it's a mixture.
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