Is boiling an egg a physical change?

* Protein Denaturation: The heat from boiling causes the proteins in the egg white and yolk to unfold and change their structure. This is a permanent change and can't be reversed.

* Color Change: The yolk changes color from pale yellow to a deeper yellow, which is due to the chemical breakdown of certain pigments.

* Texture Change: The egg white solidifies, and the yolk becomes firm. This is due to the formation of new bonds between the proteins, a chemical process.

While the egg might look different after boiling (a physical change), the chemical composition and structure of the egg have been permanently altered. This makes it a chemical change.