Naming and Writing Polyatomic Ionic Compounds 12/4/13.

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Presentation transcript:

Naming and Writing Polyatomic Ionic Compounds 12/4/13

Reference Material  Poly means many  Polyatomic ions are a group of atoms that have a charge when they are together  Most have a negative charge

Writing Polyatomic Ionic Compounds Formulas 1. We look at the name of the compound 2. Find the oxidation number for each ion 3. Write the symbol and its charge 4. DROP & SWAP Sodium carbonate

Writing Polyatomic Ionic Compounds Formulas 1. We look at the name of the compound 2. Find the oxidation number for each ion 3. Write the symbol and its charge 4. DROP & SWAP Magnesium nitrate

Writing Polyatomic Ionic Compounds Formulas 1. We look at the name of the compound 2. Find the oxidation number for each ion 3. Write the symbol and its charge 4. DROP & SWAP Barium sulfate

Write the formula for the following polyatomic ionic compounds:  Ammonium Sulfide  Potassium Carbonate  Aluminum Phosphate

Naming Polyatomic Ionic Compounds  Rules 1. Write your cation first 2. Write your anion second  if polyatomic ion, keep ending  if nonmetal replace ending with –ide Examples: KCN _______________________________

Naming Polyatomic Ionic Compounds  Rules 1. Write your cation first 2. Write your anion second  if polyatomic ion, keep ending  if nonmetal replace ending with –ide Examples: Ca(OH) 2 ____________________________

Naming Polyatomic Ionic Compounds  Rules 1. Write your cation first 2. Write your anion second  if polyatomic ion, keep ending  if nonmetal replace ending with –ide Examples: NH 4 F _______________________________

Naming Polyatomic Ionic Compounds  KOH ______________________________________  CaSO 4 ____________________________________  BaCO 3 _____________________________________  Al 2 (SO 4 ) 3 ________________________________