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1) The electronegativity difference between oxygen and hydrogen. Since oxygen is much more electronegative (electron loving) it attracts the negative charge closer to it, thus creating a polarized bond where the O is more negative and the H's more positive.
2) Its bent shape. If water were a linear molecule it wouldn't be polar at all and the properties of water would be VERY different. Since its bent, it allows the polarization of the molecule to have a net negative/positive regions within the molecule.
A question for the chemistry section but it is because oxygen is more electronegative then hydrogen so it pulls the electron closer leading the molecule to become and electical dipole = a polar molecule
Do you understand it like this?
thank you both so much for explaining it! I understand now.
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THEY ARE AN OKAY EXPLANATION
This one has a good chart of it.
As I understood it, the oxygen has higher electronegativity than the two hydrogens and it pulls the two hydrogens.
H---O---H (bent shape). The oxygen attracts H and the H attracts O (Remember the rule of opposite attractions).