* Electronegativity: Oxygen is more electronegative than hydrogen, meaning it has a stronger pull on the shared electrons in the covalent bonds. This results in the oxygen atom having a slightly negative charge (δ-) and the hydrogen atoms having slightly positive charges (δ+).
* Bent Shape: The molecule's bent shape, due to the two lone pairs of electrons on the oxygen atom, further contributes to its polarity. This arrangement places the hydrogen atoms on one side of the molecule and the oxygen atom on the other, creating a separation of charge.
Consequences of Polarity:
* Hydrogen Bonding: Water molecules can form hydrogen bonds with each other, due to the attraction between the partially positive hydrogen atom of one molecule and the partially negative oxygen atom of another. These bonds are strong and give water many of its unique properties.
* Solubility: Water is a good solvent for many polar molecules and ionic compounds. This is because the positive and negative ends of water molecules can interact with the charges on the solute molecules or ions.
* High Boiling Point: The hydrogen bonds between water molecules make it difficult to separate them, resulting in a relatively high boiling point.
* Surface Tension: The strong hydrogen bonds between water molecules create surface tension, which allows water droplets to form.
In essence, the polarity of water molecules means they have a distinct positive and negative end, which allows them to form strong bonds with other molecules, making water a highly versatile and essential substance for life.
