PPT Slide

48

Bond Polarity, Bond Angle, and Dipole Moment

• Polar bonds do not always lead to a polar molecule!

• In CO2 the electronegativity difference  between C and O makes each C=O bond polar.

• Because its bonds are directed 180° apart, the identical bond  polarities in CO 2 are counterbalanced; CO 2 is nonpolar overall.

• Water also has identical atoms bonded to the central atom, but it  does have a dipole moment ( _= 1.85 D) due to its shape.

• The bond polarities do not counterbalance each other  because the water molecule is V shaped.

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