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Compounds with Polyatomic Ions

Compounds with Polyatomic Ions. Naming and writing formulas. Cations. Polyatomic Anions. Acetate C 2 H 3 O 2 1- Carbonate CO 3 2- Hydroxide OH 1- Nitrate NO 3 1- Phosphate PO 4 3- Sulfate SO 4 2-. Ammonium NH 4 1+ Calcium Ca 2+

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Compounds with Polyatomic Ions

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  1. Compounds with Polyatomic Ions Naming and writing formulas

  2. Cations Polyatomic Anions Acetate C2H3O21- Carbonate CO32- Hydroxide OH 1- Nitrate NO31- Phosphate PO43- Sulfate SO42- Ammonium NH41+ Calcium Ca2+ Iron (II) Fe2+ Iron (III) Fe3+ Sodium Na1+ Tin (IV) Sn4+

  3. Cations Polyatomic Anions Ammonium NH41+ Iron (II) Fe2+ Iron (III) Fe3+ Sodium Na1+ Tin (IV) Sn4+ Acetate C2H3O21- Carbonate CO32- Hydroxide OH 1- Nitrate NO31- Phosphate PO43- Sulfate SO42-

  4. Cations Polyatomic Anions Ammonium NH41+ Calcium Ca2+ Iron (II) Fe2+ Iron (III) Fe3+ Sodium Na1+ Tin (IV) Sn4+ Acetate C2H3O21- Carbonate CO32- Hydroxide OH 1- Nitrate NO31- Phosphate PO43- Sulfate SO42-

  5. Math Class Chemistry Class We just wrote out the formula for calcium acetate Ca(C2H3O2)2 Why do we need the parentheses? Can’t we just leave them off? No. Then we would have CaC2H3O22 BUT calcium acetate doesn’t have 22 oxygen atoms! Can’t we just double the acetate subscripts? CaC4H6O4? No. Writing it like this destroys the structural cues hidden in the formula. Analogy of two people hiding in a closet… • Y * Y * Y = Y3 • Would you write (Y)3 ? No, it would be a waste of time. • (X+Y)*(X+Y)*(X+Y) = (X+Y)3 • Can you write X+Y3 instead? • No, that has a different meaning - you are only cubing the Y and not quantity of X+Y. When to use parentheses

  6. Does the compound have any polyatomic ions? NO YES When writing the compound, do you need more than one polyatomic ion? NO The formula does NOT need any parentheses NO YES Summing up: Use () when? Do you need to double, triple, etc. a single polyatomic cation or anion? Surround the polyatomic ion(s) with parentheses and add the subscript outside the ( ) YES

  7. Cations Polyatomic Anions Ammonium NH41+ Calcium Ca2+ Iron (II) Fe2+ Iron (III) Fe3+ Sodium Na1+ Tin (IV) Sn4+ Acetate C2H3O21- Carbonate CO32- Hydroxide OH 1- Nitrate NO31- Phosphate PO43- Sulfate SO42-

  8. Cations Polyatomic Anions Ammonium NH41+ Calcium Ca2+ Iron (II) Fe2+ Iron (III) Fe3+ Sodium Na1+ Tin (IV) Sn4+ Acetate C2H3O21- Carbonate CO32- Hydroxide OH 1- Nitrate NO31- Phosphate PO43- Sulfate SO42-

  9. Cations Polyatomic Anions Ammonium NH41+ Calcium Ca2+ Iron (II) Fe2+ Iron (III) Fe3+ Sodium Na1+ Tin (IV) Sn4+ Acetate C2H3O21- Carbonate CO32- Hydroxide OH 1- Nitrate NO31- Phosphate PO43- Sulfate SO42-

  10. Spot the error…What’s wrong with the information in RED? Cations Polyatomic Anions Ammonium NH41+ Calcium Ca2+ Iron (II) Fe2+ Iron (III) Fe3+ Sodium Na1+ Tin (IV) Sn4+ Acetate C2H3O21- Carbonate CO32- Hydroxide OH 1- Nitrate NO31- Phosphate PO43- Sulfate SO42-

  11. Spot the error…What’s wrong with the information in RED? Cations Polyatomic Anions Ammonium NH41+ Calcium Ca2+ Iron (II) Fe2+ Iron (III) Fe3+ Sodium Na1+ Tin (IV) Sn4+ Acetate C2H3O21- Carbonate CO32- Hydroxide OH 1- Nitrate NO31- Phosphate PO43- Sulfate SO42-

  12. Spot the error…What’s wrong with the information in RED? Cations Polyatomic Anions Ammonium NH41+ Calcium Ca2+ Iron (II) Fe2+ Iron (III) Fe3+ Sodium Na1+ Tin (IV) Sn4+ Acetate C2H3O21- Carbonate CO32- Hydroxide OH 1- Nitrate NO31- Phosphate PO43- Sulfate SO42-

  13. Spot the error…What’s wrong with the information in RED? Cations Polyatomic Anions Ammonium NH41+ Calcium Ca2+ Iron (II) Fe2+ Iron (III) Fe3+ Sodium Na1+ Tin (IV) Sn4+ Acetate C2H3O21- Carbonate CO32- Hydroxide OH 1- Nitrate NO31- Phosphate PO43- Sulfate SO42-

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