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Ionic Compounds using Polyatomic Ions

Ionic Compounds using Polyatomic Ions. Chapter 5. What is a Polyatomic Ion?. A cluster of atoms (usually nonmetals) that use molecular bonding within the cluster.

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Ionic Compounds using Polyatomic Ions

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  1. Ionic Compounds usingPolyatomic Ions • Chapter 5

  2. What is a Polyatomic Ion? • A cluster of atoms (usually nonmetals) that use molecular bonding within the cluster. • More than one atom covalently bonded (sharing electrons) together carrying a charge (the cluster needs to gain or lose electrons to be satisfied).

  3. -ates and -ites

  4. Notable Exceptions

  5. What if there’s more than two?

  6. Write the chemical formula for calcium chlorate • Ca+2 ClO3-1 • Ca(ClO3)2

  7. Write the chemical formula for aluminum carbonate • Al+3 CO3-2 • Al2(CO3)3

  8. Write the chemical formula foriron (III) dichromate • Fe+3 Cr2O7-2 • note that dichromate does not mean two chromates, it is a particular ion • it got its name for the two chromium’s in the ion, not because there will be two of the polyatomic ions in the compound Fe2(Cr2O7)3

  9. Write the chemical formula for nickel(II) nitrite • Ni+2 NO2-1 • Note the charge on the nitrite is -1 not 2x-1, the subscript 2 is part of the ion. Ni(NO2)2

  10. Write the chemical formula for gallium cyanide • not GaCN3 • you need 3 cyanides to go with the one gallium Ga(CN)3

  11. Write the name for Mn(SO4)2 • Manganese(IV) sulfate

  12. Write the name for (NH4)3PO4 • Ammonium phosphate • ammonium, NH4+1 is one of the few positive polyatomic ions

  13. Write the name for Ca2Fe(CN)6 • how do you know whether it is ferrocyanide or ferricyanide? • look at the fact that there are 2 Ca+2 ions present • that means that the total cation is +4 and thus the anion must be -4 to match. calcium ferrocyanide

  14. Write the name for AuSCN • gold(I) thiocyanate

  15. Write the chemical formula for tin(IV) hydroxide • Sn(OH)4

  16. Write the name for CuCO3 • copper(II) carbonate

  17. Write the chemical formula for copper(I) ferrocyanide • Cu2Fe(CN)6

  18. Write the name for CoAs • cobalt(III) arsenide

  19. Write the chemical formula for uranium(VI) fluoride • UF6

  20. Write the name forcadmium acetate • Cd(C2H3O2)2

  21. Write the chemical formula for iron(III) sulfite • Fe2(SO3)3

  22. Write the name for Cr(ClO)3 • chromium(III) hypochlorite

  23. Write the chemical formula for ammonium nitrate • NH4NO3

  24. Write the name for Mg(OH)2 • magnesium hydroxide

  25. Write the chemical formula for K3Fe(CN)6 • potassium ferricyanide

  26. Write the name for Pb(Cr2O7)2 • lead(IV) dichromate

  27. It’s all in the name....

  28. Which formula contains the most number of “atoms?” • 11 atoms 7 atoms • Mn(SO4)2 • Cr(ClO)3

  29. Which formula contains the greatest number of ions? • 3 ions 4 ions • Mn(SO4)2 • Cr(ClO)3

  30. Which formula has the highest total charge on the anions? • - 4 - 3 • Mn(SO4)2 • Cr(ClO)3

  31. Which formula has the largest molar mass? • 55+2(32)+8(16) 52+3(35.5)+3(16) • = 247 = 206.5 • Mn(SO4)2 • Cr(ClO)3

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