What is the difference between physical and chemical transformations ?
During chemical transformations, substances change into other substances, which is not the case during physical transformations.
Is freezing a physical or chemical transformation?
It is a physical transformation.
What do you notice during freezing of salt water?
During freezing temperature increases.
Why?
A mixture like salt water is constituted of different kind of molecules. They behave differently, for instance in this case, freezing temperature is not constant!