Which statment best illustrates phase equilibrium? (a) Ice in a tray melts as th

Question

Which statment best illustrates phase equilibrium? (a) Ice in a tray melts as the temperature goes up (b) In a sealed container,water evaporates and condenses asthe water level remains constant. (c) Ice in a tray evaporates directly from solid to watervapor in a process of sublimation (d) In a sealed container,two gases interact such that reversereactions precede forward reactions Which statment best illustrates phase equilibrium? (a) Ice in a tray melts as the temperature goes up (b) In a sealed container,water evaporates and condenses asthe water level remains constant. (c) Ice in a tray evaporates directly from solid to watervapor in a process of sublimation (d) In a sealed container,two gases interact such that reversereactions precede forward reactions

Explanation / Answer

Phase equilibrium is when two phases of a substances arepresent in constant amounts. When water evaporates and condenses atthe same rate, there is no change in the amount of water and watervapor at any point. This is called equilibrium. The rate ofevaporation is equal to the rate of condensation. So the answer is(b).

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