Question

Physical properties of ice, water and steam are different. What is the chemical composition of water in all the three states?

Answer 1

Hint: Any property of matter that can describe the state of matter is known as physical property. Physical properties can be measured. Physical properties include: Color, appearance, odor, Boiling point, freezing point, melting point, density, solubility, viscosity, etc. Physical properties depend on the state of matter. Thus, as the state of matter changes, physical properties change.
A property of substance which gives the chemical composition of the substance is known as chemical property. Chemical properties include: Reactivity, type of bonding, toxicity, flammability, etc. The chemical composition of a substance does not change as the physical state of the substance changes. Thus, chemical properties or chemical composition is independent of the state of matter.

Complete step by step answer:
The three states of matter are: solid, liquid and gaseous. When the state of matter changes, physical properties change but the chemical composition of the substance remains the same.

Water in solid state is known as ice, in liquid phase is known as water and in gaseous state is known as steam.

The intermolecular forces in solid state are very strong, in liquid state are moderate and in gaseous state are very weak. Thus, depending on the intermolecular forces, the physical properties of ice, water and steam vary drastically.

The chemical composition of any substance does not change as the physical state of the substance changes. Thus, the chemical composition of water in all three states is the same.
Thus, the chemical composition of water in all the three states is ${{\text{H}}_{\text{2}}}{\text{O}}$.

Note:
The three states of matter are: solid, liquid and gaseous. These states are interconvertible i.e. matter can be converted from one state to another by increasing or decreasing the temperature and pressure. When the state of matter changes, only physical properties of substances change, the chemical composition however remains the same.