Question: The following molecules contain polar covalent bonds. Which of them are polar molecules and which are nonpolar? (a) CCl4; (b) CHCl3; (c) CO2; (d) H2S; (e) SO2

How do I do this? My solution book shows drawings and the cancellation of vectors. I'm good at math so I can deal with vectors but what I'm having trouble with (that is IF I actually have to know how to draw these figures) is with drawing the figures that show the directions of the vectors.

If someone knows an easier method; please explain it to me otherwise I'd still appreciate the explanation of how to determine what these drawings are.

Thanks in advance!