Physical properties of ice, water and steam are very different. What is the chemical composition of water in all the three states.
Chemical composition of water is not differing in any of these states. We know that three forms of physical states exist, namely solid, liquid and gas.
H2O exists in the solid form as ice, it exists in the liquid form as water and as steam in the gas state. All of these states consist of H2O, due to which no change in the chemical composition of water is observed in these states.
The difference in all these three states is created by the physical properties as the molecules of the three different states are arranged in three different types therefore accounting to the difference in physical properties like molecular weights.