Chemistry (12th Edition)

Published by Prentice Hall
ISBN 10: 0132525763
ISBN 13: 978-0-13252-576-3

Chapter 9 - Chemical Names and Formulas - 9.2 Naming and Writing Formulas for Ionic Compounds - Sample Problem 9.2 - Page 273: 10


a. BaS b. Li^2O c. Ca^3N^2 d. CuI^2

Work Step by Step

a. Barium's charge is plus 1, and sulfates charge is minus 1, so it balances. Therefore you can simply write BaS. b. Lithium has a charge of plus 1, while oxygen has a charge of minus 2. To balance oxygen's, you must have two lithiums. Therefore you write Li^2O. c. For this problem you use this criss cross method, since the charges are not divisible. Therefore, you simply move the plus 2 charge of calcium over to nitrate, and vice versa. d. Copper has a charge of plus 2, while iodine's has a charge of minus 1. Therefore, to balance out coppers positive charge, you need two iodines. The formula is CuI^2
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