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Writing Ionic Formulas that contain Polyatomic Ions

Writing Ionic Formulas that contain Polyatomic Ions. Objectives. Define a polyatomic ion Given the name of a compound containing a polyatomic ion, write its formula. What is a Polyatomic Ion. Polyatomic Ion: Two or more atoms that are covalently bonded that act as a single unit.

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Writing Ionic Formulas that contain Polyatomic Ions

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  1. Writing Ionic Formulas that contain Polyatomic Ions

  2. Objectives • Define a polyatomic ion • Given the name of a compound containing a polyatomic ion, write its formula.

  3. What is a Polyatomic Ion • Polyatomic Ion: Two or more atoms that are covalently bonded that act as a single unit. • All Polyatomic ions act as an anion ( negative charge) except for NH4 • NH4+ is the only polyatomic ion that has a positive charge, and acts as a cation.

  4. EXAMPLES OF SOME POLYATOMIC IONS (HCO3)- Hydrogen carbonate Ion (PO4)3- Phosphate Ion (NH4)+ Ammonium Ion (NO3)- Nitrate Ion

  5. Locate the Polyatomic Ions on Your Periodic Table • They are found under the Sub Heading “Common Ions” Find the columns that read, Ions. ADD THE FOLLOWING: OH- Hydroxide C2H3O2- Acetate

  6. Writing Formulas for Ionic Compounds containing Polyatomic Ions Example: Potassium Carbonate • Write the symbols for the metal and the non-metal ( or polyatomic ion). • Write the charges on the metal (cation)and the non-metal (anion) • Swap-n –drop if the positive and negative charges do not cancel out.

  7. Potassium Carbonate Example: Potassium Carbonate 1. Write the element symbols and charges K+ (CO3)2-

  8. Swap-n-Drop K2CO3

  9. Practice Examples

  10. ANSWERS • 1. Be2+SO32- BeSO3 • 2. Na+C2H3O2_ NaC2H3O2 • 3. Ca2+(NO3)- Ca(NO3)2 • 4. Al3+(NO2)- Al(NO2)3 • 5. Fe 3+ (OH)- Fe(OH)3 • 6. NH4+ PO43- (NH4)3PO4

  11. Ch. 6 Wksht #3

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