Does heat always cause a chemical change in food give examples?

Answer 1

Usually id say. Heat usually breaks the bonds in the food or perhaps trigger the molecules in the food to further react. Example would be heating eggs, the heat breaks the hydrogen bonds in the protein thus denaturing the protein.

Answer 2

No, heat does not always cause a chemical change in food. Some examples include melting butter or chocolate, toasting bread, or boiling water. These processes involve a physical change where the substance undergoes a change in state but does not undergo a chemical reaction.