it would be easier to read your posts if you used the subscripts and other helpful parts. heres a link:
what is the general theory??
well you find the partial charges and if one side is more charged (i.e H2O) then its a polar molecule
If you compare the "http://en.wikipedia.org/wiki/Carbon_dioxide" [Broken] you will see that CO2 is symmetrical whereas H20 is asymmetrical. This is what leads to the imbalance in charge.
well since u like wiki so much heres a wiki post talking bout polarity
Well, Wiki was my choice, not the OP's, and I am merely refering to it to show the diagram of the molecules. Even Wiki couldn't screw that up...
well i cant explain it better than to say that the angle of the bonding affects the polarity
Separate names with a comma.