Question

reasons to regard water as a compound.

Answer 1

hii there,
Water as a Compound and Molecule. ... The chemical formula for water is H2O, which means each molecule of water consists of one oxygen atom chemically bonded to two hydrogen atoms. Thus, water is a compound. It's also a molecule, which is any chemical species formed by two or more atoms chemically bonded to each other.
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Answer 2

1. water is made up of two elements in a fixed ratio
2. water has totally different properties from the two elements
3. its constituents can be separated only by chemical or electrochemical reactions
 4. water is formed by reaction between hydrogen and oxygen thats why water is a compound not a mixture.