1. Ionic Compounds Nomenclature Chapter 2, Section 2.4 (p.74 – 78)

2. Part 1 - Writing Chemical formula. Part 2 - Naming Ionic Compounds

3. Part 1 - Write the Chemical formula for: 1) Binary ionic compound. 2) Polyatomic ionic compound.

4. 1) Binary ionic compound - definition Consists of ions of only two elements. Ex: Sodium Oxide Sodium Chloride Potassium fluoride Potassium Iodide

5. 1) Binary ionic compound Bring out a piece of paper. Example: Sodium Oxide 1)Write the symbols of the elements with the metal first and the non-metal second. 2)Refer to the periodic table to get the ionic charge of the ions. Write the charges above the symbols. 3)Determine how many of each type of ion are required to bring the total charge to zero (use cross-over). 4)Write the chemical formula with subscripts showing the number of each type of ion. 5)Make sure subscripts are lowest whole number ratio. Remove the subscript ‘1’.

6. Practice Binary ionic compound: Magnesium Chloride.

7. 2) Polyatomic Ionic Compound Consists of ions of more than two elements. Take a look at your handout with a table showing common polyatomic ions. Ex: SO 4 2- PO 3 3- OH -

8. 2) Polyatomic Ionic Compound Bring out a piece of paper. Example: Aluminum Sulfate 1)Write the symbols of the elements with metal first and polyatomic ion second (from the table in handout). 2)Refer to the periodic table to get the ionic charge of the ions. Write the charges above the symbols. Note: remember that charge on polyatomic ion is shared over entire ion. 3)Determine how many of each type of ion are required to bring the total charge to zero (or just use cross-over). 4)Write the chemical formula with subscripts showing the number of each type of ion. 5)Make sure subscripts are lowest whole number ratio. Remove the subscript ‘1’.

9. Practice Polyatomic ion compound: Sodium Bicarbonate.

10. Part 2 - Naming Ionic compounds a) Binary ionic compound. b) Polyatomic c) Multiple Valence

11. a) Naming Binary Ionic compounds When naming Binary ionic compounds, First part of the name comes from the metal. Second part comes from non-metal & modified to end in ‘ide’. Ex: NaCl is Sodium Chloride Chemical FormulaMetallic ionNon-metallic ionIUPAC name CaCl 2 Calcium, Ca 2+ Chloride, Cl - Calcium Chloride Na 2 OSodium, Na + Oxide, O 2- Sodium Oxide AlNAluminum, Al 3+ Nitride, N 3- Aluminum Nitride

12. b) Naming Ionic with multivalent ions Some metals atoms are multivalent. Form a variety of cations, each with a different charge. Ex: Iron can form Fe 2+ ions or Fe 3+ ions Would both FeO and Fe 2 O 3 be called Iron Oxide? No. There is one extra step here – adding proper Roman numeral in brackets after name of ion. Note: you are given a table with multivalent ions on your handout. Bring out a piece of paper. Let’s work with this example: Fe 2 O 3

13. 1) Identify any ions of multivalent metals or polyatomic ions in the compound (using this table)

14. 2) Write the chemical formula with the charge of anion (non- metal ion) above its symbol. 3)Find the possible charges for the multivalent metal from the periodic table or table given in previous slide. 4)Find the total negative charge for the chemical formula. 5)Use the zero-sum rule to find the charge on each of the positive ions. 6)Write the compound name (IUPAC name) using rules for naming ionic compounds. Indicate the charge of the multivalent metal with a Roman numeral in brackets.

15. Practice - Naming Ionic with multivalent ions SnCl 4 Pb (NO 3 ) 2 - ?

16. 3) Polyatomic Ionic Compound Consists of ions of more than two elements. Take a look at your handout with a table showing common polyatomic ions. Ex: Pb(ClO 4 ) 2

17. 3) Naming Ionic compounds with polyatomic ions 1)Identify any ions of multivalent metals or polyatomic ions in the compound (using handout table). 2) Write the chemical formula with the charge of anion (non-metal ion) above its symbol. 3)Find the possible charges for the multivalent metal from the periodic table or table given in previous slide. 4)Determine the name and charge of the polyatomic ion (use polyatomic table on handout). 5)Find the total negative charge for the chemical formula. 6)Use the zero-sum rule to find the charge on each of the positive ions. 7)Write the compound name (IUPAC name) using rules for naming ionic compounds. Indicate the charge of the multivalent metal with a Roman numeral in brackets. Use the correct name for any polyatomic ions.

18. Practice - Naming Ionic compounds with polyatomic ions Cu 3 PO 4 (NH 4 ) 2 CO 3

19. Summary 1) Is it an ionic compound? 2) Does the chemical formula begin with a multivalent metal ion? 3) Does the formula contain a polyatomic ion? It is binary ionic compound. Name first element followed by its charge as a Roman numeral (I, II, III..etc.). Ex: FeO is Iron (II) Oxide. It is polyatomic ionic compound Yes No Yes

20. Note: Check handout given in class and practice a LOT! Writing Chemical Formula: Binary ionic compound, Polyatomic Ionic compound. Naming Ionic compounds: Binary ionic compound, ionic with multivalent ions, polyatomic ionic compound.

21. Homework: Do p. 75 (Practice): 1 (a to c), 2 (a to c) Do p. 77 (Practice): 1 (a to d). Do p. 78 (practice): 2 (a to f). Do p.81 questions 1, 2, 3, 7 (a to e), 8.