True or false in a physical change, the substance doesn't change its identity

A physical change are changes which alters a substance without changing its composition. So physical means without changing its substances. For example if we changed a persons appearances it would be a physical change, but that doesn't change who they are as a person or their identity. So, true.

In a chemical change, a substance cannot change back to the form it used to be in.
Ex. A Rusty Nail
In a physical change, it is reversible to change back into how the substance was; shape or size.
Ex: Freezing liquid is a physical change
I hope you can find the answer to this question with my details!
Hope this helps:)

He should put sand around the spill in order to contain it so that it won't spread