1. GOOD MORNING! Today we will: Turn in Bonding Lab 1 st 6 weeks of 2 nd semester ends Friday! Ionic Quiz 2 Parenthesis vs. no parenthesis in ionic compounds – Ionic Bonding Practice Problems due @ end of class Naming Covalent Bonds Intro to Lewis Structures HW: DUE Wed 2/10, Covalent Bond Practice Problems, Quiz Revisions 2 nd Column of Vocab DUE Fri

2. Quiz Revisions: full credit back Common Ions Quiz Version A #5. CN - (freebie! No need to correct) Version B #7. zinc : was not specific if (II) or (III) Naming Ionic Compounds + Lab Quiz Version A #1 (b). Zinc (II) sulfate Version B #1 (h). FeSO 4 (typo – no parenthesis)

3. REMEMBER! When Writing Formulas Cation symbol is first, anion symbol is 2 nd If charges are balanced, cation / anion ratio is 1/1 If charges are unbalanced, add cations and/or anions so that total (-) charge and (+) charge are equal (CROSS CHARGES to make subscripts) If a polyatomic ion gets a subscript use ( ) Examples: magnesium oxide sodium phosphide iron (III) nitrate Mg 2+ O 2- Na + P -3 Fe 3+ NO 3 - MgONa 3 P Fe(NO 3 ) 3

4. Naming/Writing Formulas: Ionic vs. Covalent 1.Determine whether an ionic compound is ionic or covalent 2.If ionic – Cation = element name – Anion = root of element + ide 3.If covalent – Take out your covalent bond rules!

5. Naming Covalent Compounds: Use prefixes to show the number of atoms for each element mono=1 hexa = 6 di = 2 hepta = 7 tri = 3 octa = 8 tetra = 4 nona = 9 penta = 5 deca = 10  Name first element: Use the prefix and the element name  The 1 st element listed does not need a prefix if there is only one of that atom  Name second element: Use the prefix and add the suffix “ide” to the root of the element name  The 2 nd element always needs a prefix CO 2 = carbon dioxide N 2 O 3 = dinitrogen trioxide CO = carbon monoxide

6. Name and Write the Formula CO SO 3 NO 2 P 2 O 4 Sulfur hexafluoride Nitrogen monoxide Silicon dioxide Diarsenic trisulfide

7. Naming / Formulas for Ionic & Covalent Compounds Name compoundIonic or covalent?Formula Compound ArF 5 ZnF 2 Cu(NO 3 ) 2 P 3 Cl 2 sulfur octachloride lead (II) phosphate calcium hydroxide aluminum sulfide dinitrogen monoxide