1 Naming Ionic Compounds Due Today: “Chemical Bonding Activity” worksheet Objective: Students will be able to write balanced chemical formulas for ionic compounds and name these compounds according to IUPAC system of nomenclature Agenda: Warm-up Lecture/notes naming ionic compounds Formulas for Ionic Compounds Lab Exit Ticket Homework Finish Formulas for Ionic Compounds Lab Write up Due 1/19 Study for Test 1/21 Warm-up – Write the Chemical Formulas for the ionic bonds formed between the following elements. 1. Calcium and Bromine 2. Lithium and Sulfur 3. Sodium and Oxygen

Polyatomic Ions An ion in which two or more atoms are bonded covalently 2

It is important to know the correct charges of polyatomic ions so that you can write the correct formula When a formula contains multiple polyatomics, you must “keep it together” by putting it in parenthesis. Example: Ca 3 (PO 4 ) 2 – calcium phosphate The charge must still equal zero! 3

Practice with polyatomic ions Write the formula for Aluminum Hydroxide Barium sulfate Sodium Phosphate 4

5 Naming Ionic Compounds with Two Elements To name a compound that contains two elements, identify the cation and anion. name the cation first, followed by the name of the anion with an –ide ending.

6 Charges of Representative Elements Copyright © 2009 by Pearson Education, Inc.

7 Names of Some Common Ions

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

9 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

10 Formula IonsName cation anion 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 Examples of Ionic Compounds with Two Elements

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

12 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

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

14 Solution Br − S 2− N 3− 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

Transition Metals Form Positive Ions Most transition metals and Group 4 (14) metals form 2 or more positive ions. However, Zn 2+, Ag +, and Cd 2+ form only one ion.

16 Metals That Form More Than One Cation The name of metals with two or more positive ions (cations) use a Roman numeral to identify ionic charge.

17 Naming Ionic Compounds with Variable Charge Metals

18 Naming Variable Charge Metals Transition metals with two different ions use a Roman numeral after the name of the metal to indicate ionic charge.

19 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 - = Fe ion + 2- = 0 Fe ion = Name the cation by the element name and add a Roman numeral in parentheses to show its charge. Fe 2+ = iron(II) 3. Write the anion with an ide ending. FeCl 2 = iron(II) chloride

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

21 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

22 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-

23 Guide to Writing Formulas from the Name Copyright © 2009 by Pearson Education, Inc.

24 Writing Formulas Write 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-) = K + and 1 S 2− = K 2 S

25 Writing Formulas Write 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-) = 0 Cl − 3. 1 Fe 3+ and 3 Cl − = FeCl 3

26 Learning Check What is the correct formula for each of the following? 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

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