Chem 111
Molecules & Their Shapes
1.
Use VSEPR theory to predict the shape of the following and draw a 3dimensional depiction of each:
2.
Three different structures (not resonance structures) can be drawn for C2H2Cl2.
Draw them and indicate whether each is polar or non-polar.
3.
TeCl4 has a dipole moment. Why does this rule out tetrahedron and square planar
as possible shapes for the molecule?
With Te as the central atom and Cl placed in either a tetrahedral or square
planar arrangement around it, the molecule would have to be non-polar. Since it is
polar, it can't adopt either of these shapes. (The molecule is see-saw shaped.)
4.
Arrange the following molecules in order of increasing polarity:
H2O, H2Se, H2Te, H2S
H2 O > H2S > H2 Se > H2Te
5.
Draw a 3-dimensional depiction of each of the following molecules and indicate
whether it is polar or non-polar: