Question

4 A sample A of liquid water and a sample B of ice, of identical mass, are placed in a thermally insulated container and allowed to come to thermal equilibrium. Figure 18-25a is a sketch of the tempera ture T of the samples versus time t. (a) Is the equilibrium temperature above, below, or at the freezing point of water? (b) In reaching equi librium, does the liquid partly freeze, fully freeze, or undergo no freez ing? (c) Does the ice partly melt, fully melt, or undergo no melting?

Answer 1

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Answer 2

(A) Temperature will be at the freezing point of water

(B) The temperature rises above the freezing point

(C) Only A part of ice melts

Explanation:

• At a phase change, the temperature is constant as heat is added. From the above diagram, the ice initially warms, then stays at constant temperature when there is a change in phase.

• So the final temperature is at the freezing point of water.

• The ice reaches the freezing point first and the then the temperature remains constant. As the water cools, the ice melts.
• The temperature never rises above the freezing point, therefore, only part of the ice melts.