1. Chemical Formulas and Chemical Compounds 7-1 Chemical Names and Formulas 7-2 Oxidation Numbers 7-3 Using Chemical Formulas 7-4 Determining Chemical Formulas

2. 7-1 Chemical Names and Formulas Explains the significance of a chemical formula and describes the naming of binary ionic and molecular compounds.

3. Monatomic Ions Ions formed from a single atom. –Ex. Na +, Cl -, Br -, … You Must Know All The Ions on Page 205. In naming compounds that contain monatomic ions, drop the ending of the anion and ad – ide. –Ex. O 2- = ox ide I - = iod ide

4. Binary Compounds Compounds composed of two different elements –The sum of the positive charges equal the sum of the negative charges. Mg 2+ + Cl - + Cl - = MgCl 2 magnesium chloride Criss-Cross Method – method for determining chemical formulas. –Ex. Sodium + chlorine – Calcium + oxygen

5. Binary Compound Practice Problems

6. Binary Compounds - Stock System Some metals can have two or more actions with different charges. –Usually occurs with transition metals Use a Roman Numeral to indicate the ions charge. –Ex. Fe 2+ = Iron (II) = ferrous Fe 3+ = Iron (III) = ferric

7. Stock System Practice Problems CuO = Copper (II) oxide CuCl = Copper (I) chloride Additional Practice Problems on pg. 209

8. Compounds Containing Polyatomic Ions ** You Must Know All The Ions on Page 210 ** Oxyanions – Polyatomic ions that contain oxygen. –Nitrate (NO 3 - ), Sulfate (SO 4 2- ), Sulfite (SO 3 2- ).