* Compound: A compound is formed when two or more different elements chemically combine in a fixed ratio.

* Water is made up of two hydrogen atoms and one oxygen atom (H₂O).

* This ratio is always the same, no matter where you find water.

* Mixture: A mixture is a combination of two or more substances where each substance retains its own properties. The components of a mixture can be separated by physical means.

* For example, salt and pepper make a mixture because they are not chemically bonded, and you can easily separate them.

Key points about water as a compound:

* Chemical bonds: The hydrogen and oxygen atoms in water are held together by chemical bonds (covalent bonds).

* New properties: Water has different properties than hydrogen or oxygen alone (e.g., it's a liquid at room temperature).

* Cannot be separated physically: You can't separate water back into hydrogen and oxygen by simple physical means like filtering or evaporation. You need a chemical reaction (like electrolysis) to do so.