Polar Bonds and Molecules Sec' 8'4

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Polar Bonds and Molecules(Sec. 8.4)

• Madison High School
• Mr. Ricks

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Bond polarity

• Nonpolar covalent bonds atoms share electrons
  equally
• Polar covalent bonds atoms share electrons
  unequally

Why would atoms share unequally?
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The greater the difference in electronegativities
of 2 atoms the more polar a bond.
Pg. 177 table of electronegativitiesPg. 238
table of electronegativity differences
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Hydrogen bonds

• Attractive forces in which a hydrogen covalently
  bonded to a very electronegative atom is weakly
  bonded to an unshared electron pair of another
  electronegative atom

Strongest intermolecular force About 5 that of
an average covalent bond
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Review key differences between ionic and
molecular compounds

• See pg. 244