Question

How to tell if a molecule is polar and non polar

Answer 1

You have a polar molecule when you have a covalent bond and the atoms bonded together have a big difference in electronegativity. First remember that a covalent bond forms between 2 nonmetals where they share electrons. With a polar covalent bond, it means that whats happening here is that they dont share the electrons equally. Instead, the electrons spend most of their time around the more electronegative element. So now in the molecule you have a partial positive charge and a partial negative charge. The partial negative charge will be around that super electronegative element.