Which process changes a solid to a liquid when heat is added called?

Which process changes a solid to a liquid when heat is added called?

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

Answer: (A)

Melting is the process that changes a solid into a liquid when heat is added. The incoming heat supplies energy to the solid’s particles, weakening and eventually breaking the forces that hold them in a rigid lattice, so they can move past one another as a liquid does. This happens at the substance’s melting point, which depends on pressure. For example, ice melts into liquid water near 0°C at standard pressure. The other options describe different phase changes: freezing is liquid to solid when heat is removed, sublimation is solid turning directly into gas, and deposition is gas turning directly into solid.

Melting is the process that changes a solid into a liquid when heat is added. The incoming heat supplies energy to the solid’s particles, weakening and eventually breaking the forces that hold them in a rigid lattice, so they can move past one another as a liquid does. This happens at the substance’s melting point, which depends on pressure. For example, ice melts into liquid water near 0°C at standard pressure. The other options describe different phase changes: freezing is liquid to solid when heat is removed, sublimation is solid turning directly into gas, and deposition is gas turning directly into solid.