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Why is a water molecule a polar molecule?

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Different elements have different electro-negativities. Electro-negativity is the ability of an atom to withdraw 'electron density' towards itself, i.e. it makes electrons come closer to it.
Fluorine is the most electronegative of the elements.

Oxygen is more electronegative than hydrogen and so in water (H2O) the oxygen 'pulls' the electrons closer to itself and become slightly negative, and the hydrogen's slightly positive, this is called a permanent dipole.

Due to this effect water has many properties that make it unusual and important to living things.
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Is water a polar molecule?

Yes. The oxygen end is slightly negatively charged, and the hydrogen end is slightly positively charged.

Is a water molecule polar?

Water molecules are polar. There is an uneven distribution of  electron density making it polar. It is also a polar solvent.

Why is the polarity of the water molecule important?

  The polarity of water allows it to be almost a universal solvent. It is vital to the proper functioning of everything. Water molecules do not have a charge (like an ion)

How do polar molecules dissolve in water?

Dissolving is just when water bonds and separates the cation and anion. Water's polarity is the reason why it surrounds each ion and separates it from the oppositely charged

Why is a water molecule polar?

Since oxygen is more electronegative than hydrogen, you get something called a "dipole moment," making the oxygen slightly negative because of the unequal sharing of electrons
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Water molecules are polar with what?

The big difference in electronegativity of oxygen and hydrogen. Oxygen carries a small negative charge and the hydrogens a small positive charge. This makes the molecule polar