Physical properties refer to those properties of a substance that doesn't involve a chemical change or chemical reaction. They are physically observable properties of a substance. For example, we do not need any chemical reaction to observe the fact that water is odourless in its pure state. Also, we only need a thermometer and no chemical reaction to observe it's boiling point. Physical observation tells us that the liquid turns into vapour at that temperature. This is confirmed by observing the loss in volume of the liquid
It reacts with metals to form metal hydroxide and hydrogen gas. it s an chemical property and it decomposes to H2 and O2 is also another chemical property property. because in these reaction H2O has changed to something else hence are called chemical property.
molecule.
molecule.