Chem241a_Lecture_5 - Organic Chemistry 241a Prof. Bogdan...

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Or ganic Chemistry 241a Prof. Bogdan Olenyuk Contact Information Office: Old Chemistry 309 olenyuk@email.arizona.edu Phone: (520) 626-0754 Course web site: http://www.chem.arizona.edu/courseweb/074/CHEM241A1_2/FrameSet.html
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Chapter 2: Polar Covalent Bonds: Acids and Bases • Periodic table and electronegativity • Bond polarity and inductive effect • Dipole moments • Formal charges • Resonance: rules for resonance forms Today we will cover: Reading Assignment: McMurry (the BOOK), Ch. 2.1 – 2.5
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Polar Covalent Bonds: Electronegativity • Covalent bonds can have ionic character • These are polar covalent bonds – Bonding electrons attracted more strongly by one atom than by the other – Electron distribution between atoms is not symmetrical
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Bond Polarity and Electronegativity Electronegativity (EN): ability of an atom to attract the shared electrons in a covalent bond • Differences in EN produce bond polarity • Electronegativities are based on an arbitrary scale • F is most electronegative (EN = 4.0), Cs is least (EN = 0.7) • Metals on left side of periodic table attract electrons weakly, lower EN • Halogens and other reactive nonmetals on right side of periodic table attract electrons strongly, higher electronegativities • EN of C = 2.5
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The Periodic Table and Electronegativity
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Bond Polarity and Inductive Effect Nonpolar Covalent Bonds : atoms with similar EN Polar Covalent Bonds : Difference in EN of atoms < 2 • Ionic Bonds: Difference in EN > 2
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This note was uploaded on 08/23/2008 for the course CHEM 241A taught by Professor Olenyuk during the Fall '07 term at University of Arizona- Tucson.

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Chem241a_Lecture_5 - Organic Chemistry 241a Prof. Bogdan...

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