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A reversible change is a change you can make, then put back, however a non-reversible change is a change you can make, then it will be stuck like that
examples of physical change are ice,water,chocolate,liquid,
A Bunsen burner is an object: it is not a process of any kind.
Irreversible
physical change is reversible because you can undo it for example: if you fold a paper you unfold the paper. chemical chang is irreversible because if you make somthing together you could not seperate them.