Polar and Non-Polar Molecules

Okay for polar vs. non-polar molecules there is only one really important thing you have to remember. If when drawing a molecular diagram the molecule is symmetrical the molecule is non-polar, therefore if the molecule is unsymmetrical the molecule is polar.

Symmetrical = Non-Polar

Unsymmetrical = Polar

If you still don't understand here is a good video that explains it.

Now you should understand the general idea, now tell me which of the following molecules are polar and which are non- polar. Also using electronegativity figure out which side is partially positive and which side is partially negative (hint: the one with the most electronegativity is partially negative)

1)

2)

3)

  

Answers: 1--polar, the left side is partially negative

               2-- polar, the bottom half is partially negative
               3--non-polar

The reason why non-polar molecules have no partially negative/partially positive side is because the pull of electrons is balanced.