Question

A heating curve has two flat lines, or plateaus. What does the plateau at the lower temperature represent?

Answer 1

Answer:

B) Melting of a solid.

Explanation:

• Kindly, see the attached image.

• It is known that the substance has different 3 phases (solid, liquid, and gas).

• By heating, the substance converted from solid phase to liquid phase passing by a plateau that represents equilibrium between the two phases.

• By further heating, the solid completely converted into liquid phase, then converted to gaseous phase passing by a plateau that represents an equilibrium between the liquid an gaseous phase.

The plateau at the lower temperature represent: B) Melting of a solid.

Answer 2

Answer:

B. Melting of a Solid