Why is it a physical change to freeze water
Freezing water is considered a physical change because it involves a change in the state of matter from liquid to solid, without any alteration in the chemical composition of water molecules.
In its liquid state, water molecules are constantly moving and have enough energy to break free from their fixed positions and flow around. When water is cooled below its freezing point (0 degrees Celsius or 32 degrees Fahrenheit), the molecules slow down and start to arrange themselves in a more organized manner. The slowing down of molecular motion during freezing causes the water to change from a liquid state to a solid state, resulting in the formation of ice crystals.
Since the freezing process does not involve any chemical reactions or the creation or destruction of substances, it is considered a physical change rather than a chemical change. The ice formed can be melted back into liquid water by supplying energy in the form of heat without altering the chemical composition of the water molecules. Therefore, the freezing of water is a reversible process and does not produce any new substances.