[MiturBinlsderty]

Are double bonds to oxygen ( C = O ) and (O-H ) bonds polar? if so what makes them polar?

[Jorriss]

Do you know what polar means?

[ooosh]

In a broad sense,the bond covalent bonding two different atoms is polar.

[igloo5080]

You need to research the concept of 'electronegativity', because this is what it's all about.

[AllUnits]

The O-H bond is definitely polar. This is because of the large difference in electronegativity values between the two atoms.

[_rob]

Both of these bonds are polar, oxygen is far more electronegative than either Carbon or Hydrogen.

Electronegativity describes the tendancy of an atom to withdraw electron density toward itself in a covalent bond, in this case, leaving the carbon atom or the hydrogen atom electron deffieient and so will result in a partial positive charge (delta+) on these atom, while the Oxygen atom will aquie a partial negative (delta-) charge.

This is how bonds become polar, due to electronegativity difference in the atoms sharing the bond.

Rob

[rackye]

that's right Rob  in addition if you want you can calculate the value of the dipolar moment which is given in debye units