Question

A change in the physical state can be brought about:

• A. only when energy is given to the system
• B. only when energy is taken out from the system
• C. when energy is either given to or taken out from the system
• D. without any energy change

Answer 1

The correct option is C

when energy is either given to or taken out from the system

Explanation:

• When the system is supplied with energy, the system in a solid state transforms into a liquid.
• When heat energy is removed from a liquid, it transforms into a solid. For example, ice is converted into water, and the water is converted into water vapors when heat energy is given.
• When energy is reduced, water vapors or steam condense to water, and water freezes to ice.

Therefore, the correct option is (C). A change in the physical state can be brought about when energy is either given to or taken out from the system.