CHEM 212 Chapter 1: Solomons' Organic Chemistry
1 Nov 2016
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1. 3 chemical bonds: octet rule: atoms bond in goal of achieving noble gas configuration (stable) --octet rule in valence shell. Ionic bond is attractive force between oppositely charged ions. 1. 4 lewis structures: lewis structures: show all valence electrons (either lines or dots for unpaired) Isomers: compounds with same molecular formula but different structure: constitutional isomers: different compounds with same formula but differ in order in which atoms bonded (connectivity), structural isomers, results in different chemical & physical properties --reactivity, density, boiling points. 1. 7 structural formulas: dash structural formulas have lines showing bonding electron pairs, with elemental symbols. 2 bonds in plane of paper separated by 109o. One bond behind & one in front nearly eclipse. None of theses resonance structures will be realistic representation: 2. If resonance structures are equivalent, resonance stabilization is large: the more stable a structure is by itself, the greater its contribution to hybrid.
