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

2. About Polyatomic Ions It is an ion consisting of 2 or more atoms bounds together Charged enties Have assigned special names which must be memorized

3. About Polyatomic Ions

4. Naming Polyatomic Ions Except for hydroxide, peroxide,and cyanide the names of polyatomic ions do not have the –ide ending. Except for hydroxide, peroxide,and cyanide the names of polyatomic ions do not have the –ide ending.

5. Naming Polyatomic Ions Several series of polyatomic anions that contain an atom of a given element –oxyanion Several series of polyatomic anions that contain an atom of a given element –oxyanion Ionic compounds containing polyatomic ions are not binary compunds, because they contain more than 2 elements Ionic compounds containing polyatomic ions are not binary compunds, because they contain more than 2 elements Ex: ion: NH4+ name: ammonium Ex: ion: NH4+ name: ammonium Ex: Name NH4+ Ex: Name NH4+

6. Naming Polyatomic Ions

7. Naming Acids A substance that produces hydrogen ions (H+) un hydrogen in solution; proton donor

8. Rules for Naming Acids Polyatomic aniions derived from acids are named by droping the –ic or –ous from acid name and adding the –ate or –ite suffix\ Polyatomic aniions derived from acids are named by droping the –ic or –ous from acid name and adding the –ate or –ite suffix\ Acids which do not contain oxygen are named by adding the hydro- preffix to the root naem of the element folloed by –ic suffix Acids which do not contain oxygen are named by adding the hydro- preffix to the root naem of the element folloed by –ic suffix

9. Rules for Naming Acids Example: Describe acids Name HCIO4

10. Rules for Naming Acids that do not contain Oxygen HF HF HCI HCI HI HI HCN HCN H2S H2S Hydrofloric acid Hydrofloric acid Hydrochloric acid Hydrochloric acid Hydrobromic acid Hydrobromic acid Hydroidic acid Hydroidic acid Hydrocyanic acid Hydrocyanic acid Hydrosulfuric acid Hydrosulfuric acid

11. Rules for Naming Acids of Some Oxygen Containing Acids HNO3 HNO3 HNO2 HNO2 H2SO4 H2SO4 H2SO3 H2SO3 H3PO4 H3PO4 HC2H302 HC2H302 Nitric acid Nitric acid Nitrous acid Nitrous acid Sulfuric acid Sulfuric acid Sulfurous acid Sulfurous acid Phsphoric acid Phsphoric acid Acetic acid Acetic acid

12. Writing Formulas From Names Ionic compounds: usually contain metal and nonmetal Ionic compounds: usually contain metal and nonmetal If it is transitional metal Roman numeral gives the charge If it is transitional metal Roman numeral gives the charge -ide tells you single element not polyatomic -ide tells you single element not polyatomic Ex: Nitric Acid Ex: Nitric Acid

13. Writing Formulas From Names Each polyatomic ions is a complete until NEVER break it up or change numbers Each polyatomic ions is a complete until NEVER break it up or change numbers Most end in –ate and -ite Most end in –ate and -ite

14. Quiz 1 Name CIO- 2 Describe hot to find the name for Co 2- 3 3 Write the formula for tetraphosphorus decaoxide 4 Name H S 2 5 Name HC2H3O2

15. References www.google.com www.yahoo.com www.emsb.qc.ca/igurenil/science/name.html www.foldmprep.org/gcurran/sno/sno/lessons/lesson5.4.htm http://home.earthlink.net/ussbeaton/addinfo/formulawriting.h tml http://home.earthlink.net/ussbeaton/addinfo/formulawriting.h tml http://www.brandonsd.mb.ca/crocus/Staff/mckellar/sci2 0s/s2sdl/sdlchem/polyatomic.gif http://www.brandonsd.mb.ca/crocus/Staff/mckellar/sci2 0s/s2sdl/sdlchem/polyatomic.gif http://www.corrosionsource.com/handbook/periodic/periodic _table.gif http://www.corrosionsource.com/handbook/periodic/periodic _table.gif