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Polarity of BondsMolecular Polarity
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Equal Pull on ElectronsIf there is no difference in the electronegativity of the atoms forming a covalent bond, it forms a non-polar covalent bond.
Bonded electrons are shared equally between the two atoms.
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Unequal Pull on ElectronsIf there is a difference in the electronegativity of the atoms forming a covalent bond, it forms a polar covalent bond.
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Expressing Polar BondsPolar bonds are represented visually by bond dipoles.
The dipole shows the direction of the more negative charge density and the strength of the dipole.
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Electron DensityThe atom with the higher electronegativity will hold the electrons in the bond more often and has a partial negative charge.
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Nonpolar MoleculesBinary molecules with a nonpolar bond do not have a molecular dipole.Molecules with polar
bonds can be nonpolar if the dipoles are of equal strength and in cancelling directions.
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Polar MoleculesPolar molecules are affected by electrical fields and have electrostatic interactions with other molecules. POSITIVE
FIELDNEGATIVEFIELD
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Polarity Practice1) True or False: The molecule below has no bond dipole.
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Polarity Practice2) True or False: The molecule below has no bond dipole.
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Polarity Practice3) True or False: The molecule below is polar.
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Polarity Practice4) True or False: This molecule contains bond dipoles and has a molecular dipole.
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Polarity Practice5) True or False: This molecule contains bond dipoles and has a molecular dipole.
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Polarity Practice6) True or False: This molecule contains bond dipoles and has a molecular dipole.
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Polarity Practice7) True or False: This molecule contains bond dipoles but has no molecular dipole.
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Polarity Practice8) True or False: This molecule contains bond dipoles but has no molecular dipole.