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4.2 Naming and Writing Formulas for More Complex Compounds

Learn about polyatomic ions, naming conventions, and writing formulas for complex compounds. Understand the rules for naming acids and practice with a quiz. Helpful references provided.

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4.2 Naming and Writing Formulas for More Complex Compounds

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  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.

  5. Naming Polyatomic Ions • 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 • Ex: ion: NH4+ name: ammonium • 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\ • 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. HF HCI HI HCN H2S Hydrofloric acid Hydrochloric acid Hydrobromic acid Hydroidic acid Hydrocyanic acid Hydrosulfuric acid Rules for Naming Acidsthat do not contain Oxygen

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

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

  13. Writing Formulas From Names • Each polyatomic ions is a complete until NEVER break it up or change numbers • 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.html http://www.brandonsd.mb.ca/crocus/Staff/mckellar/sci20s/s2sdl/sdlchem/polyatomic.gif http://www.corrosionsource.com/handbook/periodic/periodic_table.gif

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