What is a chemical change?
I have said this before, but chemical change is characterized by the formation of new substances, and the making and breaking of chemical bonds.
So any process where this occurs is a chemical change by definition.
If we look at an example of physical change, a change of state:
We can see that although there has been a change in state, the
On the other hand, the reaction of an alkali metal with water is unquestionably a chemical change:
Strong bonds have been broken, and new chemical substances have been formed.