Multiple Choice
Which term describes the process that occurs when a substance changes from one phase to another, such as from solid to liquid or liquid to gas?
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13. Liquids, Solids & Intermolecular Forces
Phase Diagrams
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When water vapor is cooled at constant pressure, which phase change is most likely to occur?
A
It undergoes deposition to form liquid water.
B
It condenses to form liquid water.
C
It sublimates to form solid ice.
D
It remains as water vapor.
Verified step by step guidance1
Understand the phases of water: water can exist as solid (ice), liquid (water), or gas (water vapor).
Recall that cooling water vapor means lowering its temperature while keeping pressure constant.
Identify the phase change that occurs when a gas cools to become a liquid: this process is called condensation.
Note that deposition is the direct change from gas to solid, which is less common unless conditions favor it (like very low temperatures).
Conclude that when water vapor is cooled at constant pressure, it most likely undergoes condensation to form liquid water.
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