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Because of its shape. it is a bend molecule. Since Oxygen is more electronegative that hydrogen, you get something called a net dipole making the oxygen "delta" negative. this makes the hydrogen delta positive since the oxygen atom is more electronegative ( i like to think of it as being "hungry for electrons" or a selfish atom that hogs the electrons), the electrons spend more time orbiting the oxygen that it does the hydrogens. therefore the oxygen is slightly (or delta) negative and the Hydrogen, since the electrons spend less time in orbit around the hydrogen, is delta (slightly )positive since an electron has a negative charge.

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Wiki User

14y ago
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Wiki User

10y ago

The uneven sharing of electrons among a molecules atoms are what creates polarity. Polarity exists at two levels, the overall molecules dipole moment and the individual chemical bonds polarity. A chemical bond is considered polar whenever the difference between two atoms electronegativities is less than 0.4. A molecules dipole moment is determined by considering the direction of the polar chemical bonds as well as their strength. When a molecule has the same chemical bond in every direction possible ( such as 4 chlorine atoms attached to a carbon atom, CCl4), the overall dipole moment is 0 because the chemical bonds act like vectors and cancel each other out. If the chemical bond polarities don't evenly cancel each other out, the molecule experiences a dipole moment and is thus considered to be polar. Water has 2 hydrogen atoms attached to an oxygen atom, the overall polarity of the bonds is considerably dnjpg

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Paige Dvorachek

Lvl 4
3y ago

The electrons from the hydrogen atoms being pulled towards the oxygen atom.

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Q: What causes water to a polar molecule?
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