1. Section 4.2 Naming and Writing Formulas for More Complex Compounds Period 5 Group 6

2. Confused with section 4.2? No need to fear group 6 is here! We guarantee that after this power point you will understand section 4.2 a bit more than before you read this lesson.

3. A. Name of Polyatomic Ions Memorize!

4. A. Imagine Polyatomic Ions! Hydrogen Phosphate 3-d2-d Ammonium

5. B. Naming Compounds containing Polyatomic Ions  Oxyanions are anions that have different amounts of oxygen atoms  In the oxyanions, the names differ depending on the # of oxygens -less oxygen: -ite -more oxygen: -ate  Some series consist of more than 2 oxyanions -Least oxygen atoms: hypo -Most oxygen atoms: per

6. B. Naming Polyatomic Ions! Hypochlorite Chlorite Chlorate Perchlorate Note* the red spheres are the number of oxygen atoms

7. C. Introduction to Acids  A polyatomic ion that has H + ions.  Produce these ions when dissolved in water  Acids have a low pH measure.  Acids usually taste sour.

8. C. Acids and How to Name Them  Acids That Do Not Contain Oxygen -The prefix hydro- is added in front of the name of the acid. -the suffix –ic is added to the root name of the element  Acids Containing Oxygen -The suffix –ic or –ous is applied to the root name of the element -Use the suffix –ic if the name of the ion ends in –ate.

9. D. Written Names to Formula  The first step to naming a polyatomic ion from formula is to MEMORIZE and become FAMILIAR with polyatomic ions.  After that, check to see if there are hydrogen or oxygen atoms present  Apply the proper suffixes and prefixes

10. D. Naming Names to Formula  Remember  Higher: -ic ex: sulfuric  Lower: ousex: sulfurous  Metals with one valence electron: -ide ex: hyroxide  When there’s more oxygen than the usual amount: per-ex: peroxide  One with less oxygen: -iteex:nitrite  One with more oxygen: -ate ex: nitrate

11. E. Writing Formulas from Names  Recognize the formulas for the polyatomic ions.  Note the presence of oxygen or hydrogen to see if the compound contains oxyanions or is an acid  Make sure to balance the charge by using subscripts or roman numerals

12. E. Writing Formulas to Names  Part D. applies here too  Mono- doesn’t apply to the first element  If it doesn’t sound right drop a vowel 1mono- 2di- 3tri- 4tetra- 5penta- 6hexa- 7hepta- 8octa- 9nona- 10deca-

13. QUIZ QUIZ QUIZ QUIZ QUIZ A.Name the Polyatomic Ion 1.H 2 PO 4 - 2.Dichromate B. Name the polyatomic ion in the compound 1. NH 4 ClO2. H 2 0 2 C. Name the Common Acid 1.H 3 PO 4 2.HC 2 H 3 O 2

14. Quiz (CONT) D. Formula Compound to Written Form 1.PbO 2 2. KOH E. Written to Formula Compound 1. ammonium perchlorate 2. dinitrogen pentaoxide

15. References  http://www.files.chem.vt.edu/RVGS/ ACT/notes/Nomenclature.html http://www.files.chem.vt.edu/RVGS/ ACT/notes/Nomenclature.html  http://chemistry.about.com/od/nome nclature/a/nomenclature-ionic- compounds.htm