1. WRITING AND NAMING CHEMICAL FORMULAS

2. STANDARDS Predict chemical formulas based on the number of valence electrons and oxidation numbers Name and write the chemical formulas for simple ionic and molecular compounds, including common polyatomic ions. (standard list of common polyatomic ions need to be memorized)

3. Chemical formula Combination of symbols that represent the composition of a compound. Formula represents –elements involved –ratio of those elements

4. Structural formula Shows how atoms are joined Shows kind of atoms and the number of atoms used primarily with organic compounds example

5. Interpreting chemical formulas practice

6. Monatomic ions Ions formed from a single atom Ion – charged atom –Anion – negative ion –Cation – positive ion oxidation number –Indicates the general distribution of electrons among the bonded atoms

7. Oxidation numbers periodic table handout - memorize roman numeral –Stock system of nomenclature is used to distinguish the ion charge –Ex. Iron can be +2 or +3 Silver – transition metal but has only +1 – can be named w/o roman number

8. Older naming system Older naming system – – when metal forms has more than 1 common oxidation number, The ion with the higher charge has a name ending in ic The one with the lower charge has a name ending in ous Ex – Fe+3 – ferric Fe+2 – ferrous

9. Polyatomic ions A charged group of covalent covalently bonded atoms Handout –Make flash cards

10. Writing chemical formulas

11. Naming chemical formulas Handout - memorize chart transition elements

12. Molecular formula Formulas for compounds that exist as molecules

13. Empirical formula The simplest formula used to help identify unknown substances Molecular formula of a compound is always written as some whole-number multiple of the empirical formula ionic compounds - always written as empirical formula

14. Writing empirical formula Practice problems