Question

During the phase change you drew above, is thermal energy being added or removed?

a. Added
b. Removed

Answer 1

Step-by-step explanation:

Answer: A. Added. During a phase change, thermal energy is added to the system in order to break the intermolecular forces of the solid and allow the molecules to move freely and become a liquid. This addition of thermal energy causes an increase in temperature. As the molecules move more freely, they also release energy and the temperature begins to decrease until the molecules solidify again and the phase change is complete.

Answer 2

Understand How Changes In Thermal Energy Affect Particle Motion, Temperature, And State Change :

Step-by-step explanation:

Example Question #3. Explanation: The answer is "remove thermal energy." In order to change a gas to a liquid, you would have to cool it down, thus removing thermal energy.