Question

Maria and Carla were hiking when Maria tripped, fell, and sprained her ankle. Carla took out the first-aid kit and unwrapped a cold pack. Carla popped a vial that was inside the cold pack. The two chemicals inside the pack mixed together and the pack began to get icy cold. Carla applied the pack to Maria's ankle.

What kind of reaction occurred in the cold pack? What evidence supports your answer?

Answer 1

Chemical reaction between the Oxygen and the 2 chemicals created a cold substance.

Answer 2

the answer is C

It is a chemical change because heat energy is absorbed and the pack gets colder. A change in temperature is a sign that a chemical reaction has taken place; increase in temperature is an exothermic reaction and decrease in temperature is an endothermic reaction. This is an endothermic chemical reaction.