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Polarity

Polarity. How does electronegativity affect the polarity of a covalent bond? How does the shape of a molecule affect the polarity of a molecule?. Polarity. Uneven sharing of electrons. Within a covalent bond Within an overall molecule A molecule can have polar bonds but be nonpolar.

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Polarity

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  1. Polarity How does electronegativity affect the polarity of a covalent bond? How does the shape of a molecule affect the polarity of a molecule?

  2. Polarity • Uneven sharing of electrons. • Within a covalent bond • Within an overall molecule • A molecule can have polar bonds but be nonpolar. • A molecule can have polar bonds and be polar. • A molecule cannot have nonpolar bonds and be polar!

  3. Bond Polarity • Based on difference in electronegativity between atoms in a bond!

  4. Which bonds are polar covalent? • C—C • C—H • C—O • N—F • Na—Cl

  5. Most electronegative elements: • N, O, F

  6. Polarity is not the whole story…

  7. Just because bonds are polar…doesn’t mean molecule is polar!

  8. How about CH4, CH2Cl2, CH3Cl?

  9. Practice: • In your notebook, draw Lewis structures for the following. Identify individual bond polarities and overall polarity. • Remember, lone pairs attract electrons…so include lone pairs in your diagrams! • Make the models if it makes you feel more comfortable! • BCl3, SiO2, NF3, N2, CCl4,

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