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Writing Ionic Compounds

Writing Ionic Compounds. The “Swap & Drop” Method. Swap & Drop Method. For Ionic Compounds Only!. Potassium Ion K. Chlorine Ion Cl. -. +. 1. 1. Step 1: Drop the signs. Swap & Drop Method. Potassium Ion K. Chlorine Ion Cl. 1. 1. Step 2: Swap Values. Swap & Drop Method.

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Writing Ionic Compounds

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  1. Writing Ionic Compounds The “Swap & Drop” Method

  2. Swap & Drop Method For Ionic Compounds Only! Potassium Ion K Chlorine Ion Cl - + 1 1 Step 1: Drop the signs.

  3. Swap & Drop Method Potassium Ion K Chlorine Ion Cl 1 1 Step 2: Swap Values.

  4. Swap & Drop Method Potassium Ion K Chlorine Ion Cl 1 1 1 1 Step 3: Drop Values to Subscripts.

  5. Swap & Drop Method Potassium Ion K Chlorine Ion Cl Potassium Chloride Step 4: When the values are the same, then they can be erased. The number (1) is never required.

  6. Again, when the values are the same, then they can be erased. The number is never required. This 4th rule applies to all situations. Example: Cu2+ and CO32- Both have 2’s, which can be erased to form CuCO3

  7. Swap & Drop Method Aluminum Ion Al Oxygen Ion O - + 3 2 Step 1: Drop the signs.

  8. Swap & Drop Method Aluminum Ion Al Oxygen Ion O 3 2 Step 2: Swap Values.

  9. Swap & Drop Method Aluminum Ion Al Oxygen Ion O 2 3 2 3 Step 3: Drop values to subscripts.

  10. Swap & Drop Method Aluminum Ion Al Oxygen Ion O 2 3 AluminumOxide Step 4: Combine into compound.

  11. Swap & Drop Method:Polyatomics Iron (II) Ion Fe Phosphate Ion PO4 - + 2 3 Step 1: Drop the signs.

  12. Swap & Drop Method Iron (II) Ion Fe Phosphate Ion PO4 2 3 Step 2: Swap Values.

  13. Swap & Drop Method Iron (II) Ion Fe Phosphate Ion (PO4) 3 2 3 2 Step 3: Drop values to subscripts. *Protect the poly with parentheses.

  14. Swap & Drop Method Iron (II) Ion Fe Phosphate Ion (PO4) 3 2 Iron (II) phosphate Step 4: Combine into compound.

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