Question

A cold pack is broken, allowing two chemical substances to mix, making the pack cold. Which statement accurately describes the flow of energy in this reaction?(1 point)
Responses

Both of the substances are present at the end of the reaction, each with more energy than before the reaction.
Both of the substances are present at the end of the reaction, each with more energy than before the reaction.

The surroundings gain energy from the system.
The surroundings gain energy from the system.

The system gains energy from the surroundings.
The system gains energy from the surroundings.

Energy flows from one of the substances to the other with no change in energy of the system.

Answer 1

In the reaction involving a cold pack, when the two substances mix and the pack becomes cold, the correct statement is:

**The surroundings gain energy from the system.**

This is because the reaction absorbs heat from the surroundings, resulting in the cold sensation of the pack. The energy is drawn from the surroundings (the external environment), causing the temperature to decrease in that area. The system (the chemical reaction occurring within the pack) loses energy in this process.