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Naming Compounds & Writing Formulas

Naming Compounds & Writing Formulas. Naming Compounds & Writing Formulas. Binary compounds with standard group charges Format: Metal Non-metal i.e. NaCl , Al 2 O 3 Subscript tells number of atoms in molecule Ones are not written. Criss -cross. Aluminum & oxygen Al +3 O -2 Aluminum oxide

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Naming Compounds & Writing Formulas

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  1. Naming Compounds & Writing Formulas

  2. Naming Compounds & Writing Formulas • Binary compounds with standard group charges • Format: Metal Non-metal i.e. NaCl, Al2O3 • Subscript tells number of atoms in molecule • Ones are not written

  3. Criss-cross • Aluminum & oxygen • Al+3O-2 • Aluminum oxide • Cross with number not sign -> Al2O3 2 3

  4. Criss-cross • Calcium & fluorine • Ca+2F-(1) • Aluminum oxide -> Ca1F2 -> CaF2(don’t write 1’s) 2 1

  5. Criss-cross • Potassium & oxygen • K+(1)O-2 • Potassium oxide -> K2O1 -> K2O 1 2

  6. Criss-cross • Aluminum & nitrogen • Al+3N-3 • Aluminum nitride -> Al3N3 -> AlN(lowest ratio) 3 3

  7. Cations with more than 1 charge • Compounds including cations with more than 1 possible charge (cation name followed by Roman numeral) • Roman numeral tells oxidation number/cation charge • Compound will have 2 names – stock name & classical name • Look at chart for classical name

  8. Criss-cross • Chromium (III) & oxygen • Cr+3O-2 • Chromium (III) oxide • Chromic oxide -> Cr2O3 3 2

  9. Criss-cross • Lead (IV) & nitrogen • Pb+4N-3 • Lead (IV) nitride • Plumbic nitride -> Pb3N4 4 3

  10. Criss-cross • Manganese (III) & phosphorus • Mn+3P-3 • Manganese (III) & phosphide • Manganic & phosphide -> MnP(lowest ratio) -> Mn3P3 3 3

  11. Criss-cross • Lead (IV) & sulfide • Pb+4S-2 • Lead (IV) sulfide • Plumbic sulfide -> Pb2S4 -> PbS2(lowest ratio) 2 4

  12. Polyatomic ions • Many atom ions (poly = many) • Endings – -ate, -ite • ide(hydroxide, cyanide) <- most likely to cause problems • ium (ammonium, cation) • DO NOT CHANGE ENDINGS

  13. Criss-cross • Aluminum & sulfate • Al+3SO4-2 • Aluminum sulfate -> Al2(SO4)3 2 3

  14. Criss-cross • Calcium & phosphate • Ca+2PO4-3 • Calcium phosphate -> Ca3(PO4)2 2 2

  15. Criss-cross • Calcium & sulfite • Ca+2SO-2 • Calcium sulfite -> CaSO3(lowest ratio) -> Ca2(SO3)2 2 3

  16. Criss-cross • Aluminum & phosphate • Al+3PO4-3 • Aluminum phosphate -> Al3(PO4)3 -> AlPO4 (lowest ratio) 3 3

  17. Criss-cross • Lead (IV) & oxalate • Pb+4C2O4-2 • Lead (IV) oxalate • Plumbic oxalate -> Pb2(C2O4)4 -> Pb(C2O4)2(lowest ratio) 4 2

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