Question

what do these two changes have in common? chemicals in a battery reacting to power a flashlight cooking an egg select all that apply. both are only physical changes. both are chemical changes. both are caused by heating. both are caused by cooling.

Explanation:

Chemical changes involve the formation of new substances. In the case of chemicals in a battery reacting to power a flashlight, a chemical reaction occurs to produce electrical energy. When cooking an egg, the heat causes a chemical change in the proteins of the egg, altering its structure and properties. Neither of these changes are physical changes (which only change the state or appearance of a substance without altering its chemical composition). Also, the battery reaction is not caused by heating or cooling in the traditional sense like cooking an egg (which is caused by heating). But the key commonality is that both are chemical changes.

Answer:

Both are chemical changes.