CHM231ectures2-07

CHM231ectures2-07 - Chapter 2 Polar Covalent Bonds; Acids...

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I . Bonding and Polarity A. Recall from General Chem ….polarity of a bond is a consequence of the electronegativity differences between the atoms electronegativities C 2.5 N 3.0 O 3.4 F 4.0 H 2.2 Chapter 2 – Polar Covalent Bonds; Acids & Bases Homework: 1, 2, 5, 12-15, 25, 26, 29-31, 38-40, 44 B. When the difference between the atoms of a bond is small, there will be almost no polarity to the bond H H Polarity ~ 0 H F δ - δ + C. We must consider the OVERALL affect that each bond has in the molecule 1. In this regard, the SHAPE of the molecule becomes important H H H H H H H H δ + δ - H H H H H H H H δ + δ - δ + δ + δ + H H H H δ + δ - δ + δ ~ 0 ~ +
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E. These polarities also affect the CHEMICAL reactivity D. These polarities will directly affect their physical properties H H Cl H CH 3 -Cl δ + δ - Cl H Cl H δ + δ - H H O H H CH 3 -OH CH 2 Cl 2 δ + δ + δ - δ - δ + O H H δ + _ _ _ _ _ + + + + liquid at room temp H H H H gas at room temp δ + δ + δ + δ + H H O H H liquid or gas at r.t. ? liquid δ - Consider pentane - see chalkboard
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II. Localized vs. Delocalized bonding 1. Lewis structures represent LOCALIZED bonding
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CHM231ectures2-07 - Chapter 2 Polar Covalent Bonds; Acids...

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