Is cooking an egg a matter change?

* Physical Changes: When you cook an egg, the heat causes the proteins in the egg white and yolk to denature and coagulate. This changes the texture from liquid to solid. The egg white becomes firm and opaque, and the yolk becomes solid and changes color.

* Chemical Changes: The denaturation of proteins is a chemical process. The heat breaks the bonds that hold the protein molecules in their original shape, causing them to unfold and rearrange.

So, cooking an egg involves both physical and chemical changes, resulting in a completely different substance from the raw egg.