Polar molecules are attracted to water because they have a partial positive and partial negative charge, similar to water. This allows them to form hydrogen bonds with water molecules.

Here are some examples of polar molecules that are attracted to water:

* Alcohols: The hydroxyl group (-OH) in alcohols makes them polar.

* Amines: The nitrogen atom in amines has a lone pair of electrons, creating a partial negative charge and making the molecule polar.

* Ketones and Aldehydes: The carbonyl group (C=O) in ketones and aldehydes is polar due to the difference in electronegativity between carbon and oxygen.

* Carboxylic acids: The carboxyl group (-COOH) in carboxylic acids is highly polar due to the presence of two oxygen atoms.

* Sugars: Sugars like glucose contain multiple hydroxyl groups, making them highly polar and soluble in water.

* Amino acids: Amino acids have both a carboxyl group and an amino group, making them polar.

Key takeaway:

Polar molecules are attracted to water because they can form hydrogen bonds with water molecules. The presence of polar functional groups like hydroxyl, amino, carbonyl, and carboxyl groups increases the polarity of a molecule and its solubility in water.