Molecular Polarity
10C
When two atoms with sufficiently different electronegativities combine, a dipole forms. This is effect forms a chain reaction as neighbouring molecules act similarly. The polarity of a molecule depends on both the direction and polarity of its bonds. If the bond dipoles for molecules are symmetrical and add up to zero, the molecule is considered non-polar.
Hook:
The teacher can either do a demonstration that shows a stream of water being deflected with a statically charged comb, or simply show the video.
Action:
After the teacher shows how one shows dipole charges on molecules with delta signs, the students will work from the Nelson Chemistry 12 textbook and complete questions #1-8 on page 229.
Consolidation:
The teacher will take up any difficult questions by having students work in pairs, and putting their diagrams up on the board.