How does the composition of a mixture of hydrogen and oxygen differ of hydrogen and oxygen differ from the composition of a compound containing hydrogen and oxygen

In a mixture, there will be a solute and solvent. The hydrogen and oxygen are still two different atoms that just mixed together. But in a compound, the hydrogen and oxygen have a bond, making a new and bigger molecule. A mixture can easily be separated by physical means but a compound isn't.

What even is this. where is the question