The correct statement is: The toasting of the marshmallow is a chemical change.
To clarify:
- The melting of chocolate is a physical change because it changes state from solid to liquid without altering its chemical composition.
- The digesting of food is a chemical change because it involves breaking down food into different substances.
- The burning of wood for the campfire is a chemical change because it involves a reaction that produces new substances (ash, smoke, gases).
Thus, the toasting of the marshmallow, which involves the caramelization of sugar and other reactions that change its chemical structure, is indeed a chemical change.