Question

When you crush a first-aid pack for an injured athlete and the pack gets cold, which of the following is true?

a. A physical change has occurred, with energy being absorbed.

b. A chemical change has occurred, with energy being given off.

c. A physical change has occurred, with energy being given off.

d. A chemical change has occurred, with energy being absorbed.

Answer 1

Answer: Option (d) is the correct answer.

Step-by-step explanation:

A chemical reaction in which heat is released by the reactants is known as an exothermic reaction.

For example,
`A + B \rightarrow AB + Heat`

As energy is released, hence total energy of products is less than the total energy of reactants in an exothermic reaction.

On the other hand, a chemical reaction in which heat is absorbed by reactant molecules is known as an endothermic reaction.

For example,
`A + B + Heat\rightarrow AB + Heat`

As energy is absorbed, hence total energy of reactants is less than the total energy of products in an endothermic reaction.

Thus, we can conclude that when you crush a first-aid pack for an injured athlete and the pack gets cold, a chemical change has occurred, with energy being absorbed.

Answer 2

According to the given requirements, when you crush a first-aid pack for an injured athlete and the pack gets cold, A chemical change has occurred, with energy being absorbed is the true statement.