How can Julia keep her fish cooler?
Explanation:
To keep the fish in her cooler colder, Julia should place packets of chemicals in the cooler that absorb energy (Option A). This is based on the principles of thermodynamics and the behavior of substances during endothermic and exothermic processes.
An endothermic process absorbs heat from its surrounding environment, leading to a decrease in temperature. An example of this can be seen in instant cold packs which contain water and a salt like ammonium nitrate. When the substances are mixed, the solution absorbs heat, resulting in a cold sensation.
Conversely, an exothermic process releases heat into its surrounding environment, making things warmer. This seems to be what happened when Julia used packets that made the fish warmer, indicating they underwent an exothermic process.