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Chapter 4 Compounds and Their Bonds 4.3 Naming and Writing Ionic Formulas 1 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh.

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Presentation on theme: "Chapter 4 Compounds and Their Bonds 4.3 Naming and Writing Ionic Formulas 1 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh."— Presentation transcript:

1 Chapter 4 Compounds and Their Bonds 4.3 Naming and Writing Ionic Formulas 1 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

2 Names of Some Ionic Compounds 2 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

3 Naming Ionic Compounds Containing Two Elements Metals that form a single ion include the following: Metal(s) Ion Charge Group 1A 1+ Group 2A 2+ Al 3+ Zn and Cd 2+ Ag 1+ 3 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

4 Naming Ionic Compounds 4 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

5 Naming the Ionic Compound K 2 O Name the ionic compound K 2 O. Step 1Identify the cation and anion. The cation, K +, is from Group 1A, and the anion, O 2−, is from Group 6A. Step 2Name the cation by its element name. The cation, K +, is potassium. 5 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

6 Naming the Ionic Compound K 2 O Name the ionic compound K 2 O. Step 3Name the anion by using the first syllable of its element name followed by ide. The anion, O 2−, is oxide. Step 4Write the name of the cation first and the name of the anion second. K 2 O is named potassium oxide. 6 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

7 Learning Check Write the names of the following compounds. A. CaO___________ B. Al 2 O 3 ___________ C. MgCl 2 ___________ 7 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

8 Solution Write the names of the following compounds. Step 1 Identify the cation and anion. A.CaO:The cation, Ca 2+, is from Group 2A, and the anion, O 2−, is from Group 6A. B.Al 2 O 3 :The cation, Al 3+, is from Group 3A, and the anion, O 2−, is from Group 6A. C.MgCl 2 :The cation, Mg 2+, is from Group 2A, and the anion, Cl −, is from Group 7A. 8 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

9 Solution Write the names of the following compounds: Step 2 Name the cation by its element name. A. CaOThe cation, Ca 2+, is calcium. B. Al 2 O 3 The cation, Al 3+, is aluminum. C. MgCl 2 The cation, Mg 2+, is magnesium. 9 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

10 Solution Write the names of the following compounds. Step 3 Name the anion by using the first syllable of its element name followed by ide. A. CaOThe anion, O 2−, is oxide. B. Al 2 O 3 The anion, O 2−, is oxide. C. MgCl 2 The anion, Cl −, is chloride. 10 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

11 Solution Write the names of the following compounds: Step 4 Write the name of the cation first and the name of the anion second. A.The name of CaO is calcium oxide. B.The name of Al 2 O 3 is aluminum oxide. C.The name of MgCl 2 is magnesium chloride. 11 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

12 Learning Check Write the formulas and names for compounds of the following ions: Br − S 2− N 3− Na + Al Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

13 Solution Write the formulas and names for compounds of the following ions: Br − S 2− N 3− NaBr Na 2 S Na 3 N Na + sodium bromide sodium sulfide sodium nitride AlBr 3 Al 2 S 3 AlN Al 3+ aluminum aluminum aluminum bromide sulfide nitride 13 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

14 Metals That Form More Than One Cation Transition metals except for Zn 2+, Cd 2+, and Ag + form two or more positive ions (cations). We use a Roman numeral to identify ionic charge. Cu 2+ copper(II) Pb 2+ lead(II) Cu + copper(I)Pb 4+ lead(IV) Fe 2+ iron(II)Cr 3+ chromium(III) Fe 3+ iron(III)Cr 6+ chromium(VI) 14 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

15 Metals with Variable Charge 15 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

16 Determination of Variable Charge Use the charge on the anion and charge balance to calculate charge on the metal ion. MnF 2 Mn charge+ 2 F − charge= 0 ?+ 2 (1−)= −= 0 Mn F − = 0 16 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

17 Metals Form Positive Ions; Nonmetals Form Negative Ions 17 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

18 Naming Compounds with Variable Charge Metals 18 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

19 Naming FeCl 2 Name the ionic compound FeCl 2. Step 1Determine the charge of the cation. Because there are two Cl − anions, the charge on the Fe ion must be 2+. Step 2Name the cation by its element name and use a Roman numeral in parenthesis for the charge. The charge on Fe is represented by a Roman numeral, iron(II). 19 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

20 Naming FeCl 2 Name the ionic compound FeCl 2. Step 3Name the anion by using the first syllable of its element name followed by ide. Chlorine becomes chloride. Step 4Write the name of the cation first and the name of the anion second. The ionic compound is named iron(II) chloride. 20 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

21 Learning Check Name the following ionic compounds containing metals that form two kinds of positive ions: A. Fe 2 O 3 B. SnCl 2 21 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

22 Solution Name the following ionic compounds containing metals that form two kinds of positive ions: Step 1Determine the charge of the cation. A.Fe 2 O 3 Because there are three O 2– anions and two Fe ions, the charge on the Fe ion must be 2+. B.SnCl 2 Because there are two Cl − anions, the charge on the Sn ion must be Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

23 Solution Name the following ionic compounds containing metals that form two kinds of positive ions: Step 2 Name the cation by its element name and use a Roman numeral in parenthesis for the charge. A. Fe 2 O 3 The charge on Fe is represented by a Roman numeral: iron(III) B. SnCl 2 The charge on Sn is represented by a Roman numeral: tin(II) 23 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

24 Solution Name the following ionic compounds containing metals that form two kinds of positive ions: Step 3 Name the anion by using the first syllable of its element name followed by ide. A. Fe 2 O 3 Oxygen becomes oxide. B. SnCl 2 Chlorine becomes chloride. 24 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

25 Solution Name the following ionic compounds containing metals that form two kinds of positive ions: Step 4Write the name of the cation first and the name of the anion second. A.Fe 2 O 3 is iron(III) oxide. B.SnCl 2 is tin(II) chloride. 25 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

26 Writing Formulas from the Name of an Ionic Compound 26 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

27 27 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc. Formula for Chromium(III) Bromide Step 1Identify the cation and anion. The Roman numeral (III) indicates that the charge on the chromium ion is 3+, Cr 3+. Step 2Balance the charges. Cr 3+ Br − Br − 1(3+) + 3(1−) = 0 Step 3Write formula, cation first, using subscripts from the charge balance. CrBr 3

28 Learning Check Write chemical formulas for the following compounds: A. Nickel(II) sulfide B. Zinc chloride C. Iron(III) oxide 28 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

29 Solution Write chemical formulas for the following compounds. Step 1Identify the cation and anion. A.Nickel(II) sulfide The Roman numeral (II) indicates that the charge on the nickel ion is 2+, Ni 2+. B.Zinc chloride Zinc is one of the transition metals with a fixed charge of 2+, Zn 2+. C.Iron(III) oxide The Roman numeral (III) indicates that the charge on the iron ion is 3+, Fe Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

30 Solution Write chemical formulas for the following compounds. Step 2 Balance the charges. A. Nickel(II) sulfide Ni 2+ S 2− 1(2+) + 1(2−) = 0 B.Zinc chloride Zn 2+ Cl − Cl − 1(2+) + 2(1−) = 0 30 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

31 Solution Write chemical formulas for the following compounds. Step 2Balance the charges. C.Iron(III) oxide Fe 3+ O 2− 2(3+) + 3(2−) = 0 31 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.

32 Solution Write chemical formulas for the following compounds: Step 3 Write formula, cation first using subscripts from the charge balance. A. Nickel(II) sulfide NiS B. Zinc chloride ZnCl 2 C. Iron(III) oxideFe 2 O 3 32 Chemistry: An Introduction to General, Organic, and Biological Chemistry, Eleventh Edition Copyright © 2012 by Pearson Education, Inc.


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