Freezing water is NOT a chemical change. It is a physical one. Water molecules remain as water molecules, still two hydrogen atoms and one oxygen atom. So there is no chemical changes taking place. When freezing water, the water molecules arrange in a regular manner, so it adopts what is called the crystalline structure. read more
Water freezing into ice is a physical change because the hydrogen and oxygen molecules that make up the water stay the same, despite the change in state from liquid to solid. A physical change is simply a change in the material's physical properties, such as shape or phase. read more
If liquid water is boiled, it is still water; likewise frozen water, or ice, is still water. Melting, boiling, or freezing simply by the application of a change in temperature are examples of physical changes, because they do not affect the internal composition of the item or items involved. read more