During which state change does a substance absorb heat energy?

During which state change does a substance absorb heat energy?

• A. Melting
• B. Condensation
• C. Freezing
• D. Deposition

Answer: (A)

During melting, a substance transitions from a solid state to a liquid state by absorbing heat energy. This process involves the molecular structure of the solid gaining kinetic energy, which overcomes the forces holding the molecules together in a fixed position. As the temperature rises, the heat energy absorbed allows the molecules to move more freely, resulting in the substance transitioning into a liquid. This is a critical concept in thermodynamics, as it highlights how energy changes affect the physical state of matter.

During melting, a substance transitions from a solid state to a liquid state by absorbing heat energy. This process involves the molecular structure of the solid gaining kinetic energy, which overcomes the forces holding the molecules together in a fixed position. As the temperature rises, the heat energy absorbed allows the molecules to move more freely, resulting in the substance transitioning into a liquid. This is a critical concept in thermodynamics, as it highlights how energy changes affect the physical state of matter.