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Multiple Choice
Which processes occur at the triple point?
A
melting and freezing only
B
melting, freezing, vaporization, and condensation
C
melting, freezing, sublimation, and deposition
D
vaporization, condensation, sublimation, and deposition
E
melting, freezing, vaporization, condensation, sublimation, and deposition
Verified step by step guidance
1
Understand the concept of the triple point: The triple point of a substance is the unique set of conditions (temperature and pressure) at which all three phases (solid, liquid, and gas) coexist in thermodynamic equilibrium.
Identify the processes that can occur at the triple point: At the triple point, the substance can transition between any of the three phases. This means that all phase changes between solid, liquid, and gas are possible.
List the phase transitions: The possible phase transitions include melting (solid to liquid), freezing (liquid to solid), vaporization (liquid to gas), condensation (gas to liquid), sublimation (solid to gas), and deposition (gas to solid).
Recognize that all these processes can occur simultaneously: At the triple point, the conditions allow for all these transitions to happen at the same time, as the substance is in equilibrium between all three phases.
Conclude that the correct answer includes all six processes: melting, freezing, vaporization, condensation, sublimation, and deposition, as they all occur at the triple point.