EVERYDAY SCIENCE

Detailed explanation-1: -When liquid water (H2O) freezes into a solid state (ice), it appears changed; however, this change is only physical, as the composition of the constituent molecules is the same: 11.19% hydrogen and 88.81% oxygen by mass.

Detailed explanation-2: -(a)Freezing of water to ice and evaporation of water are physical changes.

Detailed explanation-3: -Removing heat causes water (a liquid) to freeze to form ice (a solid). When water changes to a solid or a gas, we say it changes to a different state of matter. Even though the water’s physical form changes, its molecules stay the same.

Detailed explanation-4: -When water is frozen, the ice thus form has the same chemical properties as that of water only there is a change in the state of water from liquid to solid. That is why freezing of water is a physical change.