Chemistry_1031_day37_042709_actual

Chemistry_1031_day37_042709_actual - General Chemistry I...

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Unformatted text preview: General Chemistry I CHE-1031 General Chemistry I: 1031 Dr. Jonathan M. Smith Monday, April 27 The Chemical bond! Lewis dot structures continued Polar covalent bonds Electronegativity Dipole moment Intramolecular (bonding) versus intermolecular forces Re-read Chapter 9 Begin reading Chapter 10 Mastering Chemistry problems posted Chapter 9 two atoms sharing two pairs of electrons 4 electrons Tro, Chemistry: A Molecular Approach 4 O O O O two atoms sharing 3 pairs of electrons 6 electrons Tro, Chemistry: A Molecular Approach 5 N N N N covalent bonding between unlike atoms results in unequal sharing of the electrons one atom pulls the electrons in the bond closer to its side one end of the bond has larger electron density than the other the result is a polar covalent bond bond polarity the end with the larger electron density gets a partial negative charge the end that is electron deficient gets a partial positive charge Tro, Chemistry: A Molecular Approach 6 7 H F + measure of the pull an atom has on bonding electrons increases across period (left to right) and decreases down group (top to bottom) fluorine is the most electronegative element francium is the least electronegative element the larger the difference in electronegativity, the more polar the bond negative end toward more electronegative atom 8 9 10 H F + EN 2.1 EN 4.0...
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Chemistry_1031_day37_042709_actual - General Chemistry I...

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