How are Molecules Depicted? - Belle Vernon Area School District
How are Molecules Depicted? 6.2 Lewis Structures Valence e- = an e- in the outermost E level of an atom and determines the chemical properties Lewis Structure = a structure in which e- are represented by dots: dot pairs or dashes b/t 2 atomic
symbols represents pairs in covalent bonds Lewis Structure Single Bond = covalent bond in which one pair of e-s are shared b/t 2 atoms Unshared pairs = a nonbonding pair of valence e- not involved in bonding to another atom
Simple Lewis Structures Draw the Lewis structures for the following elements K, Sr, Al, Kr, P, O Remember e- want to be as far apart as possible How to draw LS for more complex molecules 1. Draw the LS for each element 2. Put least electronegative
element in center 3. Arrange other elements around central atom to satisfy octet (H only needs 2) 4. Change dots to lines to show bonds b/t atoms Practice Try drawing the Lewis structures for NH3 CH4 H2O
CH2F2 Worksheet on Lewis Structures! F2 O2 N2 C2H4 Multiple Bonds Used when single bonds dont satisfy octets for each atom Resonance structure a
possible Lewis structure of a molecule when more than 1 L.S. is possible Delocalized e- shared b/t more than 2 atoms Practice Ca KBr CO2 HCN
Lewis Structures with Ions! NH4+ CNCO32OH- Naming Covalent Compounds Inorganic molecular compounds Specify # of each type of atom P4O6 Tetraphosphorus hexoxide P4O10 Tetraphosphorus decoxide C
o v a l e n t p r e f
i x e s Mono Di Tri Tetra Penta Hexa
Hepta Octa Nona Deca 1 2 3 4 5 6
7 8 9 10 Naming Covalent Compounds If there is 1 of the first element, mono is omitted from the word CO carbon monoxide CO2 carbon dioxide
Naming Covalent Compounds 1st element named 1st usually least e-neg 2nd element named 2nd usually most e-neg add ide ending Drop vowels o and a from prefix before adding it to a root that starts with a vowel Naming Covalent Compounds N2O4 Dinitrogen tetroxide
SF6 Sulfur hexafluoride Some common names are used instead of technical name H2O water not dihydrogen monoxide
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