Question

1. which of the following indicates that a chemical change has happened during cooking?

energy is transferred from the stove to a pan.
the food darkens.
bubbles form in boiling water.
butter melts.

Explanation:

A chemical change results in the formation of new substances. When food darkens, it is often due to a chemical reaction (such as the Maillard reaction). Energy transfer (from stove to pan) is a physical energy - related process. Bubbles in boiling water are due to a physical change (liquid water turning to gas). Butter melting is a physical change (solid to liquid).

Answer:

The food darkens.