4.2 Naming and Writing 4.2 Naming and Writing Formulas for More Formulas for More

Complex CompoundsComplex Compounds

Period 1Period 1

Group #6Group #6

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

About Polyatomic Ions

Naming Polyatomic IonsNaming Polyatomic Ions

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

Naming Polyatomic IonsNaming Polyatomic Ions

Several series of polyatomic anions Several series of polyatomic anions that contain an atom of a given that contain an atom of a given element –oxyanionelement –oxyanion

Ionic compounds containing Ionic compounds containing polyatomic ions are not binary polyatomic ions are not binary compunds, because they contain compunds, because they contain more than 2 elementsmore than 2 elements

Ex: ion: NH4+ name: ammoniumEx: ion: NH4+ name: ammonium Ex: Name NH4+Ex: Name NH4+

Naming Polyatomic Ions

Naming Acids

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

Rules for Naming AcidsRules for Naming Acids

Polyatomic aniions derived from Polyatomic aniions derived from acids are named by droping the acids are named by droping the –ic or –ous from acid name and –ic or –ous from acid name and adding the –ate or –ite suffix\adding the –ate or –ite suffix\

Acids which do not contain Acids which do not contain oxygen are named by adding oxygen are named by adding the hydro- preffix to the root the hydro- preffix to the root naem of the element folloed by naem of the element folloed by –ic suffix–ic suffix

Rules for Naming Acids

Example: Describe acids Name HCIO4

Rules for Naming AcidsRules for Naming Acidsthat do not contain Oxygenthat do not contain Oxygen HFHF HCIHCI HIHI HCNHCN H2SH2S

Hydrofloric acidHydrofloric acid Hydrochloric Hydrochloric

acidacid Hydrobromic Hydrobromic

acidacid Hydroidic acidHydroidic acid Hydrocyanic Hydrocyanic

acidacid Hydrosulfuric Hydrosulfuric

acidacid

Rules for Naming AcidsRules for Naming Acidsof Some Oxygen Containing Acidsof Some Oxygen Containing Acids

HNO3HNO3 HNO2HNO2 H2SO4H2SO4 H2SO3H2SO3 H3PO4H3PO4 HC2H302HC2H302

Nitric acidNitric acid Nitrous acidNitrous acid Sulfuric acidSulfuric acid Sulfurous acidSulfurous acid Phsphoric acidPhsphoric acid Acetic acidAcetic acid

Writing Formulas From NamesWriting Formulas From Names

Ionic compounds: usually Ionic compounds: usually contain metal and nonmetalcontain metal and nonmetal

If it is transitional metal Roman If it is transitional metal Roman numeral gives the chargenumeral gives the charge

-ide tells you single element not -ide tells you single element not polyatomicpolyatomic

Ex: Nitric AcidEx: Nitric Acid

Writing Formulas From NamesWriting Formulas From Names

Each polyatomic ions is a Each polyatomic ions is a complete until NEVER complete until NEVER break it up or change break it up or change numbersnumbers

Most end in –ate and -iteMost end in –ate and -ite

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

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.html

http://www.brandonsd.mb.ca/crocus/Staff/mckellar/sci20s/s2sdl/sdlchem/polyatomic.gif

http://www.corrosionsource.com/handbook/periodic/periodic_table.gif