Explanation:

Water is a polar molecule, meaning it has a positive and negative end due to the uneven sharing of electrons between the oxygen and hydrogen atoms. This polarity allows water molecules to form hydrogen bonds with other polar molecules.

Polar molecules:

* Have an uneven distribution of electrons, creating partial positive and negative charges.

* Can form hydrogen bonds with water molecules.

* Are soluble in water.

Examples of polar molecules:

* Sugars (e.g., glucose)

* Alcohols (e.g., ethanol)

* Acids (e.g., hydrochloric acid)

* Salts (e.g., sodium chloride)

Nonpolar molecules:

* Have an even distribution of electrons, with no significant charges.

* Cannot form hydrogen bonds with water molecules.

* Are insoluble in water.

Examples of nonpolar molecules:

* Oils (e.g., vegetable oil)

* Fats (e.g., butter)

* Gases (e.g., nitrogen, oxygen)

* Hydrocarbons (e.g., methane)

The "like dissolves like" principle:

Polar molecules dissolve in polar solvents (like water), while nonpolar molecules dissolve in nonpolar solvents. This principle is based on the fact that similar intermolecular forces exist between the solute and solvent molecules.