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Nomenclature A Systematic Approach to Naming Chemical Compounds.

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Presentation on theme: "Nomenclature A Systematic Approach to Naming Chemical Compounds."— Presentation transcript:

1 Nomenclature A Systematic Approach to Naming Chemical Compounds

2 Nomenclature I Binary Ionic Compounds Binary Molecular Compounds

3 Binary Ionic Compounds 2 elementsmetal with a non-metal

4 Binary Ionic Compounds 2 elementsmetal with a non-metal Naming systematically: Write metal name then name of the non-metal modified with “-ide” ending If 2 or more oxidation states are possible then a Roman numeral follows the metal name – the Stock convention (e.g., transition metals, Sn, Pb) Examples: KClpotassium chloride MgF 2 magnesium fluoride By the way: Not Potassium Chloride Not Magnesium Fluoride

5 Binary Ionic Compounds Note: ionic charge is based on location on the periodic table. Thus, formula can be deduced from name and vice versa.

6 He Ne Ar Kr Xe Rn The Periodic Table of the Elements Most Probable Oxidation State CrMnFeCoNi Mo W Tc Re Ru Os Rh Ir Pd Pt 4 H Li Na K Rb Cs Fr Sc Y Be Mg Ca Sr Ba Ra La Ac B Al Ga In Tl Ti Rf Hf Zr C Si Ge Sn Pb F Cl Br I At O S Se Te Po N P As Sb Bi Zn Cd Hg Cu Ag Au V Nb Ta Ce Th PrNdPmSmEuGdTbDyHoErTmYbLu PaUNpPuAmCmBkCfEsFmMdNoLr DuSgBoHaMe

7 Binary Ionic Compounds Examples Aluminum chloride Al 3+ Cl - AlCl 3 AlCl (3+) + ?(-1) = 0 (3+) + 3(-1) = 0 Write the chemical formula of aluminum chloride

8 Binary Ionic Compounds Examples CuBr 2 Write the systematic name for CuBr 2 copper(II) bromide Cu ?+ Br - (?+) + 2(-1) = 0 (2+) + 2(-1) = 0 Cu ?+ Cu 2+ Copper is a transition element so use Stock convention for naming the metal ion:

9 Binary Ionic Compounds Al 2 O 3 aluminum oxide TaCl 5 tantalum(V) chloride osmium(IV) oxide OsO 2 magnesium nitrideMg 3 N 2 Examples of compounds where multiple oxidation states are available Examples

10 Binary Molecular Compounds 2 elementsusually 2 non-metals Naming systematically: Write the unmodified name of the first element followed by the name of the second element modified with the “-ide” ending. Number of each atom indicated by use of the Greek numeral prefix Note: electrons are shared—therefore number of each element cannot be determined from periodic table. The number of each element must be provided in compound name. Greek Prefixes 1mono-7hepta- 2di-8octa- 3tri-9nona- 4tetra-10deca- 5penta-12dodeca- 6hexa-

11 Binary Molecular Compounds Examples Sulfur dioxide SO 2 SO Write the chemical formula of sulfur dioxide 2 It’s a compound of 2 nonmetals so ionic charge calculations don’t apply.

12 Binary Molecular Compounds Examples CCl 4 Write the systematic name for CCl 4 carbon tetrachloride Now, assemble the pieces of the name… carbon chloride tetra

13 Notes: If 2 o’s in a row then drop 1 If the first element is mono the prefix is usually dropped Examples: N2ON2Odinitrogen monoxide N2O4N2O4 dinitrogen tetraoxide COcarbon monoxide CO 2 carbon dioxide P2O5P2O5 diphosphorous pentoxide arsenic triiodideAsI 3


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