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1 Chapter 9 Chemical Names and Formulas 9.1 & 9.2 Naming and Writing Ionic Formulas Copyright © 2008 by Pearson Education, Inc. Publishing as Benjamin.

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Presentation on theme: "1 Chapter 9 Chemical Names and Formulas 9.1 & 9.2 Naming and Writing Ionic Formulas Copyright © 2008 by Pearson Education, Inc. Publishing as Benjamin."— Presentation transcript:

1 1 Chapter 9 Chemical Names and Formulas 9.1 & 9.2 Naming and Writing Ionic Formulas Copyright © 2008 by Pearson Education, Inc. Publishing as Benjamin Cummings

2 2 Naming of Ionic Compounds In the name of an ionic compound The positive ion (first ion) is named as the element. The negative ion (second ion) is named by changing the end of the element name to –ide.

3 3 Names of Some Common Ions

4 4 Complete the names of the following ions: Ba 2+ Al 3+ K + _________ __________ _________ N 3  O 2  F  _________ __________ _________ P 3  S 2  Cl  _________ __________ _________ Learning Check

5 5 Ba 2+ Al 3+ K + barium aluminum potassium N 3  O 2  F  nitride oxide fluoride P 3  S 2  Cl  phosphide sulfide chloride Solution

6 6 To name a compound that contains two elements Identify the cation and anion. Name the positive metal ion (cation) as the element. Name the anion by changing the ending to ide. Name the cation first followed by the name of the anion. Naming Ionic Compounds with Two Elements ( Binary Ionic Compounds)

7 7 Charges of Representative Elements Copyright © 2008 by Pearson Education, Inc. Publishing as Benjamin Cummings

8 8 Guide to Naming

9 9 Formula IonsName NaClNa + Cl - sodium chloride K 2 SK + S 2- potassium sulfide MgOMg 2+ O 2- magnesium oxide CaI 2 Ca 2+ I - calcium iodide Al 2 O 3 Al 3+ O 2- aluminum oxide Some Ionic Compounds with Two Elements

10 10 Some Ionic Compounds

11 11 Learning Check Write the formulas and names for compounds of the following ions: N 3− Br − S 2− Na + Al 3+

12 12 Solution N 3− Br − S 2− Na + Al 3+ NaBr sodium bromide Na 2 S sodium sulfide Na 3 N sodium nitride AlBr 3 aluminum bromide Al 2 S 3 aluminum sulfide AlN aluminum nitride

13 13 Write the names of the following compounds: 1) CaO___________ 2) KBr___________ 3) Al 2 O 3 ___________ 4) MgCl 2 ___________ Learning Check

14 14 Write the names of the following compounds: 1)CaOcalcium oxide 2)KBrpotassium bromide 3)Al 2 O 3 aluminum oxide 4)MgCl 2 magnesium chloride Solution

15 15 Most Transition Metals form Two or More Positive Ions Most of the transition metals Form 2 or more positive ions. For example, Copper forms Cu + and Cu 2+ Iron forms Fe 2+ and Fe 3+ Gold form Au + and Au 3+

16 16 Metals that form more than One Cation Table 5.4 Some Metals That Form More Than One Positive Ion Copyright © 2008 by Pearson Education, Inc. Publishing as Benjamin Cummings

17 17 Periodic Table and Some Ions

18 18 Naming with Variable Charge Metals (Transition Metals) Copyright © 2008 by Pearson Education, Inc. Publishing as Benjamin Cummings

19 19 Naming Variable Charge Metals (Transition Metals) Transition metals With two different ions use a Roman numeral after the name of the metal to indicate ionic charge. Only zinc, silver, and cadmium form one ion (Zn 2+, Ag +, and Cd 2+ )

20 20 Naming FeCl 2 To name FeCl 2; 1. Determine the charge of the cation using the charge of the anion (Cl - ). Fe ion + 2 Cl - = 1(?) + 2(1-) = 0 Fe ion = 2+ Fe Name the cation by the element name and a Roman numeral in parenthesis to show charge. Fe 2+ = iron(II) 3. Write the name of the anion with an ide ending. iron(II) chloride = FeCl 2

21 21 Naming Cr 2 O 3 To name Cr 2 O 3 1. Determine the charge of cation from the anion (O 2- ). 2Cr ions + 3 O 2- = ? + 3(2-) = ? - 6 = 0 ? = +6 +6/ 2Cr ions = +3 Cr ion = 3+ Cr Name the cation by the element name and use a Roman numeral in parenthesis to show its charge. Cr 3+ = chromium(III) 3. Write the name of the anion with -ide ending. chromium (III) oxide = Cr 2 O 3

22 22 Learning Check Select the correct name for each. A. Fe 2 S 3 1) iron sulfide 2) iron(II) sulfide 3) iron (III) sulfide B. CuO 1) copper oxide 2) copper(I) oxide 3) copper (II) oxide

23 23 Solution Select the correct name for each. A. Fe 2 S 3 3) iron (III) sulfide Fe 3+ S 2- B. CuO 3) copper (II) oxide Cu 2+ O 2-

24 24 Guide to Writing Formulas from the Name

25 25 Writing Formulas Write the formula of potassium sulfide. STEP 1Identify the cation and anion. potassium = K + sulfide = S 2− STEP 2. Balance the charges. K + S 2− K + 2(1+) + 2(1-) = 0 STEP 3. 2 K + and 1 S 2− = K 2 S

26 26 Writing Formulas Write the formula of cobalt(III) chloride. STEP1. Identify the cation and anion. cobalt (III) = Co 3+ (III = charge of 3+) chloride = Cl − STEP 2. Balance the charges. Co 3+ Cl − Cl − = (3+) + 3(1-) = 0 Cl − STEP 3. 1 Co 3+ and 3 Cl − = CoCl 3

27 27 Learning Check The correct formula for each of the following is: A. Copper (I) nitride 1) CuN2) CuN 3 3) Cu 3 N B. Lead (IV) oxide 1) PbO 2 2) PbO 3) Pb 2 O 4

28 28 Solution The correct formula is A. Copper (I) nitride 3) Cu 3 NNeed 3Cu + and N 3- B. Lead (IV) oxide 1) PbO 2 Need Pb 4+ and 2O 2-


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