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Chemistry involves knowing the names and formulas of certain compounds. In addition, an understanding of a few basic polyatomic ions can help. The polyatomic ions usually combine with metals in the first and second columns of the periodic table.
Names and Formulas of Compounds
| Water | | H2O | |
| Ammonia | | NH3 | |
| Carbon Dioxide | | CO2 | |
| Sodium Chloride | | NaCl | |
| Nitrous Oxide | | N2O | |
| Calcium Carbonate | | CaCO3 | |
| Calcium Oxide | | CaO | |
| Calcium Hydroxide | | Ca(OH)2 | |
| Sodium Hydrogen Carbonate | | NaHCO3 | |
| Hydrochloric Acid | | HCl | |
| Sulfuric Acid | | H2SO4 | |
| Nitric Acid | | HNO3 | |
Common Polyatomic Ions
| | CO32- | | Carbonate |
| | ClO3- | | Chlorate |
| | CrO42- | | Chromate |
| | CN- | | Cyanide |
| | OH- | | Hydroxide |
| | NO3- | | Nitrate |
| | NO2- | | Nitrite |
| | PO43- | | Phosphate |
| | SO42- | | Sulfate |
| | SO32- | | Sulfite |
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