[equation33]

hello chemists

im taking an intro to chemistry class at my college and need help with the concepts of polar and non polar molecules. Am i right so far? that polar molecules have electric dipoles which are a positive and negative ends and are separated in the molecule and that non polar molecules have there positive and negative ends coinciding on top of each other. So how can i find out idf a molecule is polar or non polar? is it possible with lewis structures?

[ARGOS++]

Dear Equation33,

Sorry! But the "Lewis Structure" is not telling you anything about the absolutely required “Geometrical Structure” of the Molecule.
Only if knowing the “Geometrical Structure” of H-O-H you are able to understand why water is polar.
The same is true to realise, that O=C=O is the opposite; it is NON-polar, because both polar centres are finally located at exactly the identical place. 
For any calculation a table containing the “Electronegativity” of all Atomes is required.
One Example of such a table you may find under:

“Electronegativity”

Good Luck!
                    ARGOS⁺⁺