Ionic Formulas and Naming PowerPoint

Chapter 4Compounds and Their Bonds4.3Naming and Writing IonicFormulasCopyright © 2005 by Pearson Education, Inc.Publishing as Benjamin Cummings1

Naming Ionic Compounds with TwoElementsTo name acompound thatcontains twoelements,• identify the cationand anion.• mame the cationfirst followed by thename of the anion.2

Charges of RepresentativeElementsCopyright © 2005 by Pearson Education, Inc.Publishing as Benjamin Cummings3

Names of Some Common IonsCopyright © 2005 by Pearson Education, Inc.Publishing as Benjamin Cummings4

Learning CheckComplete the names of the following ions.Ba 2+ Al 3+ K +_________ __________ _________N 3 O 2 F _________ __________ _________P 3 S 2 Cl _________ __________ _________5

SolutionBa 2+ Al 3+ K +barium aluminum potassiumN 3 O 2 F nitride oxide fluorideP 3 S 2 Cl phosphide sulfide chloride6

Examples of Ionic Compounds withTwo ElementsFormula Ions Namecation anionNaCl Na + Cl - sodium chlorideK 2 S K + S 2- potassium sulfideMgO Mg 2+ O 2- magnesium oxideCaI 2 Ca 2+ I - calcium iodideAl 2 O 3 Al 3+ O 2- aluminum oxide7

Learning CheckWrite the names of the following compounds.1) CaO ___________2) KBr ___________3) Al 2 O 3 ___________4) MgCl 2 ___________8

SolutionWrite the names of the following compounds:1) CaO calcium oxide2) KBr potassium bromide3) Al 2 O 3 aluminum oxide4) MgCl 2 magnesium chloride9

Learning CheckWrite the formulas and names for compounds of thefollowing ions:Br − S 2− N 3−Na +Al 3+10

SolutionBr − S 2− N 3−NaBrNa 2 SNa 3 NNa +sodiumbromidesodiumsulfidesodiumnitrideAl 3+AlBr 3aluminumbromideAl 2 S 3aluminumsulfideAlNaluminumnitride11

Transition Metals form PositiveIonsMost transition metals and Group 4(14) metals form 2or more positive ions.Zn 2+ , Ag + , and Cd 2+ form only one ion.12

Metals that form more than OneCationThe name of metals with two or more positive ions(cations) use a Roman numeral to identify ionic charge.Lead Pb 2+ lead(II)Pb 4+lead(IV)Copyright © 2005 by Pearson Education, Inc.Publishing as Benjamin Cummings13

Naming Ionic Compounds withVariable Charge MetalsCopyright © 2005 by Pearson Education, Inc.Publishing as Benjamin Cummings14

Naming Variable Charge MetalsTransition metalswith two differentions use a Romannumeral after thename of the metalto indicate ioniccharge.15

Naming FeCl 2To name FeCl 21. Determine the charge of the cation using the chargeof the anion (Cl - ).Fe ion + 2 Cl - = Fe ion + 2- = 0Fe ion = 2+2. Name the cation by the element name and add aRoman numeral in parenthesis to show its charge.Fe 2+ = iron(II)3. Write the anion with an ide ending.FeCl 2 = iron(II) chloride16

Naming Cr 2 O 3To name Cr 2 O 31. Determine the charge of cation from the anion (O 2- ).2 Cr ions + 3 O 2- = 02 Cr ions + 3(2-) = 02 Cr ions - 6 = 02 Cr ions = +6Cr ion = 3+ = Cr 3+2. Name the cation by the element name and add aRoman numeral in parenthesis to show its charge.Cr 3+ = chromium(III)3. Write the anion with an ide ending.chromium(III) oxide = Cr 2 O 317

Learning CheckSelect the correct name for each.A. Fe 2 S 31) iron sulfide2) iron(II) sulfide3) iron(III) sulfideB. CuO1) copper oxide2) copper(I) oxide3) copper(II) oxide18

SolutionSelect the correct name for each.A. Fe 2 S 33) iron (III) sulfide Fe 3+ S 2-B. CuO3) copper (II) oxide Cu 2+ O 2-19

Guide to Writing Formulas from theNameCopyright © 2005 by Pearson Education, Inc.Publishing as Benjamin Cummings20

Writing FormulasWrite a formula for potassium sulfide.1. Identify the cation and anion.potassium = K +sulfide = S 2−2. Balance the charges.K +S 2−K +2(1+) + 2(1-) = 03. 2 K + and 1 S 2− = K 2 S21

Writing FormulasWrite a formula for iron(III) chloride.1. Identify the cation and anion.iron (III) = Fe 3+ (III = charge of 3+)chloride = Cl −2. Balance the charges.Fe 3+Cl −Cl − = (3+) + 3(1-) = 0Cl −3. 1 Fe 3+ and 3 Cl − = FeCl 322

Learning CheckWhat is the correct formula for each of the following?A. Copper(I) nitride1) CuN 2) CuN 3 3) Cu 3 NB. Lead(IV) oxide1) PbO 2 2) PbO 3) Pb 2 O 423

SolutionThe correct formula isA. Copper (I) nitride3) Cu 3 N Need 3Cu + and N 3-B. Lead (IV) oxide1) PbO 2 Need Pb 4+ and 2O 2-24