Here's the difference between air as a mixture and water as a compound:

Air as a Mixture:

* Components retain their properties: Air is primarily made up of nitrogen (N₂) and oxygen (O₂), with smaller amounts of other gases like argon, carbon dioxide, and water vapor. These components retain their individual chemical properties even when mixed together.

* Variable composition: The proportions of these gases can vary depending on location, altitude, and other factors.

* No chemical bonding: The gases in air are not chemically bonded to each other. They are simply physically mixed together.

* Easy to separate: The components of air can be separated using physical methods, like condensation and fractional distillation.

Water as a Compound:

* Fixed composition: Water is always made up of two hydrogen atoms (H) and one oxygen atom (O) in a fixed ratio (H₂O).

* New properties: Water has properties that are different from either hydrogen or oxygen alone. It's a liquid at room temperature, has a high boiling point, and is essential for life.

* Chemical bonding: The hydrogen and oxygen atoms in water are chemically bonded together. This means they have formed a new substance with different properties.

* Difficult to separate: Separating water into hydrogen and oxygen requires a chemical reaction, like electrolysis.

In Summary:

* Mixtures are formed by physically combining substances, and the components retain their individual properties.

* Compounds are formed by chemically combining elements in a fixed ratio, creating a new substance with unique properties.