Here are today’s CHM 111 notes, covering polarity of molecules and introducing valence bond theory.
Any questions? Ask here!
Click the link below for 3D renderings of some of the molecules we’ve discussed in class recently.
Carbon tetrachloride, a tetrahedral molecule
Carbon disulfide, a linear molecule
Nitrogen trifluoride, a pyramidal molecule
Ethylene, a molecule with two trigonal planar centers
Formaldehyde, a trigonal planar molecule
Propane
Ethanol
Below, you’ll find some structures for molecules we discussed while talking about polarity.
Difluoroethane, showing that the fluorine atoms and hydrogen atoms are on different sides of the molecule
Difluoromethane again, but with shading indicating electrostatic potential (blue for negative, red for positive)
The polar molecule fluoromethane, with shading
Ethanol, as you can see in this shaded image, is polar. That helps explain why ethanol and water mix so well together!