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Formulas of Ionic Compounds

Learn how to write formulas for ionic compounds using cations and anions and the criss-cross method. Practice writing formulas for compounds like copper II sulfate, barium chloride, and iron II oxide. Complete a worksheet on formulas of ionic compounds.

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Formulas of Ionic Compounds

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  1. Formulas of Ionic Compounds

  2. An ionic compound is a compound composed of ions. They tend to be combinations of metals and nonmetals. Copper II Sulfate CuSO4

  3. Formulas of Ionic Compounds: • Formulas for ionic compounds can be written by the following steps: • (1) Write the formula for the cation and anion (Don’t forget to include the charge of each ion). • (2) Decide how many cations and anions are needed so that the sum of their charges balances out to be zero or use the criss – cross method. • (3) Write the formula of the compound by writing the number of cations followed by the number of anions which you used in step #2. Remember not to include the charges of the ions since now they balance out to be neutral. • (*Note when using more than one polyatomic ion the polyatomic ion must be written in parentheses).

  4. Write the formula for barium chloride BaCl2

  5. Write the formula for iron (II) oxide FeO

  6. Write the formula for calcium phosphate Ca3(PO4)2

  7. Write the formula for ammonium carbonate (NH4)2CO3

  8. Write the formulas for the following compounds • cobalt (II) chloride • lithium sulfate • ammonium dichromate (d) aluminum oxide (e) boron (III) phosphide (f) Chromium (V) nitrate

  9. Write the formulas for the following compounds • cobalt (II) chloride CoCl2 • lithium sulfate • ammonium dichromate (d) aluminum oxide (e) boron (III) phosphide (f) Chromium (V) nitrate

  10. Write the formulas for the following compounds • cobalt (II) chloride CoCl2 • lithium sulfate Li2SO4 • ammonium dichromate (d) aluminum oxide (e) boron (III) phosphide (f) Chromium (V) nitrate

  11. Write the formulas for the following compounds • cobalt (II) chloride CoCl2 • lithium sulfate Li2SO4 • ammonium dichromate (NH4)2Cr2O7 (d) aluminum oxide (e) boron (III) phosphide (f) Chromium (V) nitrate

  12. Write the formulas for the following compounds • cobalt (II) chloride CoCl2 • lithium sulfate Li2SO4 • ammonium dichromate (NH4)2Cr2O7 (d) aluminum oxide Al2O3 (e) boron (III) phosphide (f) Chromium (V) nitrate

  13. Write the formulas for the following compounds • cobalt (II) chloride CoCl2 • lithium sulfate Li2SO4 • ammonium dichromate (NH4)2Cr2O7 (d) aluminum oxide Al2O3 (e) boron (III) phosphide BP (f) Chromium (V) nitrate

  14. Write the formulas for the following compounds • cobalt (II) chloride CoCl2 • lithium sulfate Li2SO4 • ammonium dichromate (NH4)2Cr2O7 (d) aluminum oxide Al2O3 (e) boron (III) phosphide BP (f) Chromium (V) nitrate Cr(NO3)5

  15. HOMEWORK • Worksheet: Formulas of Ionic Compounds • Due Friday.

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