Okay, fair question. Cracking an egg is a physical change. The shell breaks into pieces, but it’s still calcium carbonate. You could (theoretically) glue it back together. Gross, but possible.
PPT - Physical Change vs. Chemical Change PowerPoint Presentation, free
The cooking, however, is where the identity theft happens. The egg white becomes something it never was before: a solid, rubbery, edible structure. That’s a hard no for “physical change.”
