Polar Molecules Section 3.3.

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Presentation transcript:

Polar Molecules Section 3.3

Recap from 2.3 Polar covalent bonds: EN: 0.5 – 1.7 electron sharing is NOT equal between atoms more electronegative atom has a negative dipole (∂-)

Polar molecules are entire molecules that have partially positive and negative ends.

TWO things are required to make a molecule polar: presence of polar bonds – dipole within bond 3-D geometry – asymmetrical arrangement of bond dipoles in molecule If symmetrical, the bond dipoles would cancel each other out Polar bonds Asymmetrical dipoles POLAR MOLECULE Non-polar bonds NON-POLAR MOLECULE

Polarity & 3-D Geometry If the distribution of bond dipoles around the central atom is asymmetrical, the overall molecule will be polar. If the bond dipoles cancel each other out, the overall molecule is not polar.

All of these shapes will produce bond dipoles that cancel each other out. If present, lone pairs take the place of a peripheral atom, and distort the arrangement of the other atoms.

Examples: HCl (∆EN=____) CO2 (∆EN=____) Determining polarity: Stepwise CF4 (∆EN=____) H2O (∆EN=____) Determining polarity: Stepwise Calculate EN - Does molecule contain polar bonds? Draw Lewis structure to determine symmetry. Do dipoles cancel?

Determining Molecule Polarity: Flowchart Are there polar bonds present? The molecule is non-polar. The molecule is polar. NO YES The molecule may be polar. Do all dipoles cancel each other?

Determining Molecule Polarity: Shortcuts Always non-polar if: all bonds are non-polar all bonds to central atoms are identical, AND no lone pairs on central atom hydrocarbon Probably polar if: bonds to central atom are not identical central atom has lone pairs contains –OH groups NET DIPOLE NO NET DIPOLE These are just shortcuts – always draw the dipoles to check!! http://phet.colorado.edu/en/simulation/molecule-polarity