Nomenclature worksheet

Nomenclature worksheet - Chemistry 109 Nomenclature...

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Chemistry 109                         Nomenclature, Formulas, Models and Lines…Oh My! Lyric of the Week:  “ Obsession - take another look ”- Slipknot –  The Nameless Chemical Formulas 1. Describes the composition of a substance by giving the relative numbers of atoms of  each element in the compound.  Symbols represent the atom present and any  subscripted numbers tell you how many there are of that atom. 2. Binary compounds contain only two elements. 3. Guidelines for formulas of  binary compounds a. Except for hydrogen, the element farther to the left in the periodic table appears  first:  KCl, PCl 3 , Al 2 S 3 , and Fe 3 O 4 b. If hydrogen is present, it appears last except when the other element is form  Group 16 or 17 of the periodic table:  LiH, NH 3 , B 2 H 6 , and CH 4  but H 2 O 2 , H 2 S, HCl  and HI. c. If both elements are from the same group of the periodic table, the lower one  appears first:  SiC and BrF 3 . Structural Formulas 1. Gives the number of atoms and shows how the atoms are connected to one another. 2. Bonds – attractive forces that hold the atoms in a molecule in their specific  arrangement. a.  Single bond – one pair (2 electrons) of shared electrons between two atoms. b. Double bond – two pairs (4 electrons) of shared electrons between two atoms. c. Triple bond – three pairs (6 electrons) of shared electrons between two atoms. 3. Lines in structural formulas represent the bond(s) between the atoms. a.
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This note was uploaded on 04/12/2008 for the course CHEM 109 taught by Professor Malina during the Spring '08 term at UNL.

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Nomenclature worksheet - Chemistry 109 Nomenclature...

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