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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