05 Notes - Polarity - Pluchino Regents Chemistry Bonding...

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Pluchino Regents Chemistry Bonding and Molecular Shape 05 Polarity Aim: How do we determine if a bond or molecule is polar? Do Now: What is the definition of electronegativity? How might it effect the sharing of electrons? Bond Polarity Using electronegativity differences, we can determine if the electrons in a bond are shared evenly or unevenly 0.4 or less, the electrons are shared fairly evenly More than 0.4, the electrons are not shared evenly When the electrons are shared evenly, the bond is nonpolar Example: H-H 2.1 2.1 = 0 When the electrons are not shared evenly, the bond is polar Example: H-Cl 3.0 2.1 = 0.9 Practice: Will the resulting bond be polar or nonpolar? 1. C and H 2. O and H 3. F and O 4. N and S 5. P and H 6. Cl and O Molecule Polarity Predicting Molecular Polarity 1. Draw Lewis structure with correct geometry and identify each bond as either polar or nonpolar. 2. Molecule nonpolar if: No polar bonds exist Central atom has no lone pairs and all groups the same (BF
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