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Chemical Formulas

CO 2. Chemical Formulas. H 2 O. Step One Write the symbols for the elements in the compound. Ba Cl. Step Two. Look up the oxidation numbers of the elements involved and write them as superscripts to the right of the elemental symbols. Ba 2+ Cl -. Step Three.

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Chemical Formulas

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  1. CO2 Chemical Formulas H2O

  2. Step One Write the symbols for the elements in the compound. BaCl

  3. Step Two Look up the oxidation numbers of the elements involved and write them as superscripts to the right of the elemental symbols. Ba2+Cl-

  4. Step Three All net positive charges and negative charges must be equal. The net charge for the compound must equal zero. BaCl +2(1) + -1(2) = 0 BaCl2

  5. Practice Magnesium oxide Mg2+ O2- MgO +2(1) + -2(1) = 0

  6. Practice Aluminum oxide Al3+ O2- Al2O3 +3(2) + -2(3) = 0

  7. Practice Lead (IV) sulfide Pb4+ S2- PbS2 +4(1) + -2(2) = 0

  8. Additional Practice Lithium iodide Cadmium hydride Aluminum oxide Iron (II) oxide

  9. Additional Practice Answers LiI CdH2 Al2O3 FeO

  10. Na2CO3 Formulas Containing a Polyatomic Ion KOH

  11. Step One Write the symbols for the ions in the compound. Na+ CO3-2

  12. Step Two • Determine the correct ratio of sodium ions to carbonate ions. Na + CO3-2 +1 (2) + -2(1) = 0 Na2CO3

  13. Example Al+3 SO4-2 +3(2) + -2(3) = 0 Al2(SO4)3

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