1. Polarity of Bonds Molecular Polarity

2. Equal Pull on Electrons If 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.

3. Unequal Pull on Electrons If there is a difference in the electronegativity of the atoms forming a covalent bond, it forms a polar covalent bond.

4. Expressing Polar Bonds Polar bonds are represented visually by bond dipoles. The dipole shows the direction of the more negative charge density and the strength of the dipole.

5. Electron Density The atom with the higher electronegativity will hold the electrons in the bond more often and has a partial negative charge.

6. Nonpolar Molecules Binary 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.

7. Polar Molecules Polar molecules are affected by electrical fields and have electrostatic interactions with other molecules. POSITIVE FIELD NEGATIVE FIELD

8. Polarity Practice 1) True or False: The molecule below has no bond dipole.

9. Polarity Practice 2) True or False: The molecule below has no bond dipole.

10. Polarity Practice 3) True or False: The molecule below is polar.

11. Polarity Practice 4) True or False: This molecule contains bond dipoles and has a molecular dipole.

12. Polarity Practice 5) True or False: This molecule contains bond dipoles and has a molecular dipole.

13. Polarity Practice 6) True or False: This molecule contains bond dipoles and has a molecular dipole.

14. Polarity Practice 7) True or False: This molecule contains bond dipoles but has no molecular dipole.

15. Polarity Practice 8) True or False: This molecule contains bond dipoles but has no molecular dipole.