Question

Why is the physical change to freeze water? A temperature change occurs

Answer 1

The physical change to freeze water occurs when a temperature change causes water molecules to slow down and come closer together, forming a rigid lattice structure. When water is in its liquid state, its molecules are constantly moving and interacting with each other. As the temperature decreases, the kinetic energy of the water molecules reduces, causing them to move more slowly.

At a certain temperature, known as the freezing point (0 degrees Celsius or 32 degrees Fahrenheit for pure water), the water molecules start to lose enough kinetic energy to form ordered arrangements with their neighboring molecules. This process is called crystallization or freezing. The water molecules arrange themselves in a hexagonal lattice structure, creating a solid substance referred to as ice.

During this physical change, there is no change in the chemical composition of water. It remains H2O, merely transitioning from a liquid state to a solid state due to the temperature drop.