Question

dk

Answer 1

how do you know if a molecule is polar or non polar looking at their lewis dot formula

Answer 2

When you draw the Lewis Structure:
if the molecule is retricemmetrical (not equal) then its Polar, ex: H_2_O, NH_3
if the molecule is symmetrical, like CH_4, Cl_2 then its Non Polar

Answer 3

another way to know is: if the molecule is polar than it is an ionic molecule while if the molecule is non polar than it is a covalent compound.