Question

The conditions at which the solid, liquid, and gaseous phases of a substance can exist in equilibrium with one another is called

a. boiling point.
b. freezing point.
c. sublimation point.
d. triple point.

Answer 1

The answer is: [D]: triple point .
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Answer choice [A]: boiling point; refers to the temperature at which the equilibrium vapor pressure of the liquid equals the atmospheric pressure.
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Answer choice [B]: freezing point; refers to the temperature at which the solid and liquid are at equilibrium at one atm (1 ATM pressure).
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Answer choice [C]: sublimation point; refers to a change directly from the solid to the gaseous state without becoming liquid.
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