Water and carbon dioxide- Which has a polar covalent bond and which a nonpolar covalent bond?

co2, nonpolar covalent
water polar covalent
i'll explain why

okay, if you know anything about atomic structures, you know that carbon has 4 valence electrons. so in an electron dot diagram it looks like

 .
.C.   right?
  .

and Oxygen has 6 valence electrons so it looks something like this
  ..
.O:  right?
  .

so when the carbon and two oxygens combine, they form two double bonds and make C02. double bonds are very stiff and make the molecule have a symmetrical, nonpolar shape

water, on the other hand, is H20 and has simply two hydrogens each with one valence electron
.
H

so when it combines with an oxygen, it combines normally and has no double bonds to form an 8 electron outer shell.

water is a polar bond

wateris polor b/c the electrons aren't shared equaly

You are confusing two things. Both molecules have polar covalent bonds, but in the case of carbon dioxide the bond dipoles cancel out, because the molecule is linear, so the molecule as a whole does not have a dipole moment.

water is a polar molecule. The reason is that the hydrogen atoms and oxygen atoms give of a slight electrical charge (opposite for the hydrogen and oxygen) the attract other h2o molecules. This means h2 attracts o from other molecules. This is what happens when you see beads of water. They are a bunch of polarly charged molecules attracted to one another