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Names & Formulas of Ionic Compounds

Names & Formulas of Ionic Compounds. www.lab-initio.com. Monatomic ion : single atom with a positive or negative charge. end in –ide. Metals with More than One Ionic Charge. Some transition metals form more than one cation with different charges

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Names & Formulas of Ionic Compounds

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  1. Names & Formulas of Ionic Compounds www.lab-initio.com

  2. Monatomic ion: • singleatomwith a positive or negativecharge. end in –ide

  3. Metals with More than One Ionic Charge • Some transition metals form more than one cation with different charges ex – Iron can form two different cations: Fe2+ - Iron(II) Fe3+ - Iron (III) Caution:Silveris always Ag+ Zincis alwaysZn2+

  4. Metals with More than One Ionic Charge • Group 14 metals also form multiple cations Tin can form two different cations: Sn2+ - tin(II) Sn4+ - tin(IV) Lead can form two different cations: Pb2+ - lead(II) Pb4+ - lead(IV)

  5. 9.1 Monatomic Ions

  6. Polyatomic Ions • Groups of atoms with positive or negative charge

  7. Names and Formulas of Common Polyatomic Ions

  8. Writing Ionic Compound Formulas Example: Barium nitrate 1. Write the formulas for the cation and anion, including CHARGES! 2. Check to see if charges are balanced. 3. Balance charges, if necessary, using subscripts.Use parentheses if you need more than one of apolyatomic ion. Ba2+ ( ) NO3- 2 4. Erase charges. Not balanced!

  9. Writing Ionic Compound Formulas Example: Barium nitrate 1. Write the formulas for the cation and anion, including CHARGES! 2. Check to see if charges are balanced. 3. Balance charges , if necessary, using subscripts.Use parentheses if you need more than one of apolyatomic ion. ( ) NO3 Ba 2 4. Erase charges.

  10. Writing Ionic Compound Formulas Example:Ammonium sulfate 1. Write the formulas for the cation and anion, including CHARGES! 2. Check to see if charges are balanced. 3. Balance charges, if necessary, using subscripts. Use parentheses if you need more than one of a polyatomic ion. ( ) NH4+ SO42- 2 4. Erase charges. Not balanced!

  11. Writing Ionic Compound Formulas Example:Ammonium sulfate 1. Write the formulas for the cation and anion, including CHARGES! 2. Check to see if charges are balanced. 3. Balance charges, if necessary, using subscripts. Use parentheses if you need more than one of a polyatomic ion. ( NH4 ) SO4 2 4. Erase charges.

  12. Writing Ionic Compound Formulas Example: Iron(III) chloride 1. Write the formulas for the cation and anion, including CHARGES! 2. Check to see if charges are balanced. 3. Balance charges, if necessary, using subscripts. Use parentheses if you need more than one of a polyatomic ion. Fe3+ Cl- 3 4. Erase charges. Not balanced!

  13. Writing Ionic Compound Formulas Example: Iron(III) chloride 1. Write the formulas for the cation and anion, including CHARGES! 2. Check to see if charges are balanced. 3. Balance charges, if necessary, using subscripts. Use parentheses if you need more than one of a polyatomic ion. Fe Cl 3 4. Erase charges.

  14. Writing Ionic Compound Formulas Example: Aluminum sulfide 1. Write the formulas for the cation and anion, including CHARGES! 2. Check to see if charges are balanced. 3. Balance charges, if necessary, using subscripts. Use parentheses if you need more than one of a polyatomic ion. Al3+ S2- 4. Erase charges. 2 3 Not balanced!

  15. Writing Ionic Compound Formulas Example: Aluminum sulfide 1. Write the formulas for the cation and anion, including CHARGES! 2. Check to see if charges are balanced. 3. Balance charges, if necessary, using subscripts. Use parentheses if you need more than one of a polyatomic ion. Al S 4. Erase charges. 2 3

  16. Writing Ionic Compound Formulas Example: Magnesium carbonate 1. Write the formulas for the cation and anion, including CHARGES! 2. Check to see if charges are balanced. 3. Erase charges. Mg2+ CO32- They are balanced!

  17. Writing Ionic Compound Formulas Example: Magnesium carbonate 1. Write the formulas for the cation and anion, including CHARGES! 2. Check to see if charges are balanced. 3. Erase charges. Mg CO3

  18. Writing Ionic Compound Formulas Example: Zinc hydroxide 1. Write the formulas for the cation and anion, including CHARGES! 2. Check to see if charges are balanced. 3. Balance charges , if necessary, using subscripts. Use parentheses if you need more than one of a polyatomic ion. ( ) Zn2+ OH- 2 4. Erase charges. Not balanced!

  19. Writing Ionic Compound Formulas Example: Zinc hydroxide 1. Write the formulas for the cation and anion, including CHARGES! 2. Check to see if charges are balanced. 3. Balance charges , if necessary, using subscripts. Use parentheses if you need more than one of a polyatomic ion. ( ) Zn OH 2 4. Erase charges.

  20. Writing Ionic Compound Formulas Example: Aluminum phosphate 1. Write the formulas for the cation and anion, including CHARGES! 2. Check to see if charges are balanced. Al3+ PO43- 3. Erase charges. They ARE balanced!

  21. Writing Ionic Compound Formulas Example: Aluminum phosphate 1. Write the formulas for the cation and anion, including CHARGES! 2. Check to see if charges are balanced. Al PO4 3. Erase charges.

  22. Naming Ionic Compounds • Cationfirst, then anion • Monatomic cation = name of the element • Ca2+ = calcium ion • Monatomic anion=root+-ide • Cl-=chloride • CaCl2 = calcium chloride

  23. Naming Ionic Compounds • Cationfirst, then anion • Polyatomic cation = name of the ion • NH4+= ammonium • Polyatomic anion=name of the ion • NO3-= nitrate • NH4NO3= ammonium nitrate

  24. Naming Ionic Compounds(continued) Metals with multiple oxidation states • some metals form more than one cation • use Roman numeral in name • PbCl2 • Pb2+ is cation • PbCl2 = lead(II) chloride

  25. Name the Compounds. • Al2O3 ____________________ • Fe(OH)3 ____________________ • Na2S ____________________ • BaSO4 ____________________ Aluminum oxide Iron(III) hydroxide Sodium sulfide Barium sulfate

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