Question

why Water is composed of hydrogen and oxygen and the properties of water are different from its constituent elements.

Answer 1

Explanation:

Water is a compound made up of two elements hydrogen and oxygen. The characteristic properties of these elements are different from those of water, however hydrogen and oxygen have some common properties. They are both colorless and odorless gases.

Answer 2

Because they have different molecular structures, they have very different chemical properties: water is a stable molecule, while hydrogen peroxide is unstable due to the bond between the two oxygen atoms (this is why over time, hydrogen peroxide will give off oxygen gas and turn into plain old water).