water is in the solid state , called ice & water turns into ice & water is in the liquid state , called liquid water ->  water changes from a liquid to a solid  water changes from a liquid to a solid & freezing means matter / a substance changes from a liquid into a solid by decreasing heat energy ->  the water freezes  the water freezes & freezing is a kind of phase change ->  water undergoes a phase change  water undergoes a phase change & phase changes change the arrangement of molecules in a substance / in a sample -> the arrangement of molecules in water is changed by a phase change