Can you pleas explain chemical polarity?

Question

I do not get it. Please explain it in the most detail as possible cause Ive been on several websites and still dont understand. Examples would be really appreciated, they help me to understand! Thank You!

Answer 1

This usually refers to covalently bonded compounds, and it has to to with the differences of electronegativity between the elements.

For example, water is H2O. The electronegativity of H is about 2.2, and O is 3.5. So the water molecule, H-O-H, which is shaped like a boomerang, has a slight (-) charge on the O and a slight (+) charge on the H wings. So there is a polarity in water, in which there is (+) "behind," and (-) "ahead."