Question

difference between polar and non polar?

Answer 1

First off, if the molecule is symmetrical, it is probably non-polar. An example is CO2, CH4, or SeF5.
An idea of if it is polar, unequal sharing of electrons. H20. The shape is actually a tetrahedral. The same structure at CH4. Though in the place of two H's, there are 4 e- . This makes the molecule not symmetrical.
Think of H2O as this. The side where the H's are is slightly more positive. The side where the two pairs of electrons are, the molecule is slightly negative. The molecule overall is a neutral charge, but different portions of the molecule have slight variations in charge.
In the molecule C2H2Cl2, there are three different structures. One with both Cl's on one carbon, one with both Cl's are either top and bottom, or both Cl's at diagonals. When they are at diagonals the molecule is non-polar. In both other cases it is polar.

Answer 2

hope this will help

Answer 3

rane is right. here are my two-pennies: something that's polar could be directed to point in a definite direction by an electric field--if it's strong enough. also, the attraction between polar things is usually stronger than the attraction between nonpolar things, so we can indirectly tell from melting points, boiling points, or the behavior of these things in chromatography.