polar and non polar molecules

Question 1

symmetric molecules

Answer 1

all bonds are identical and there are no lone pairs.
they will not be polar even if the individual bonds within the molecular are polar
e.g CO2
O = C = O

Question 2

what do individual dipoles of symmetrical molecules do?

Answer 2

the individual dipoles on the bonds cancel out due to the symmetrical shape of the molecules. there is no net dipole movement - the molecule is not polar.

Question 3

effect of charged rod on polar/non polar liquids and results

Answer 3

a charged rod (formed by rubbing a plastic rod) is brought close to a jet of liquid flowing from a burette.

if the liquid is polar, the jet of liquid will be attracted to the electrostatic force of the rod. the dipoles in the polar molecules will all align and the delta negative ends will be attracted to the positive rod (or vice versa).

the stronger the dipole, the more the deflection of the jet.

non-polar liquids will not be deflected and attracted to the charged rod