Suppose an experiment was conducted in which a solid block of subzero ice was pl

Question

Suppose an experiment was conducted in which a solid block of subzero ice was placed in a thermally insulated container and heated at n constant rate from a temperature of 25 degree C to a temperature greater than 100 degree C. You should interpret the following graph of ideal experimental data. (A graph of real data would show scatter due to experimental uncertainties and deviations from constant and uniform heating.) Figure 17.2-1 Explain what is happening to the ice during each of the segments. A through D, of the graph. Also give the appropriate heat equation for that segment. For example, a good answer for part (a) is: in segment A the temperature of the solid block of ice is increasing linearly with time from -25 degree C to 0 degree C during a two minute span of time. No ice has melted. The heat equation is ........etc,. Look carefully at segment E. What do you think could be happening to the H2O during that time? What would happen after the 18 minute period if the container were open to the atmosphere rather than insulated?1

Explanation / Answer

(a)
Phase A - The ice is heated from -25 degrees to 0 degrees (melting point of water).

Phase B - This is the conversion of ice to water, so we have an ice water mixture for 2 minutes (on the time graph).

Phase C- The heating of water from 0 to 100 degrees (boiling point).

Phase D- The transition of water to steam (again a mixture) within a span of 10 minutes.

(b)

Segment E is the heating of pure steam (because all of the water has gone past the boiling point).

(c)

If we expose the steam into the atmosphere, the temperature of the steam will drop down to the temperature of the atmosphere. If we assume the atmosphere is at room temperature, say 25 degrees C, the steam will convert back to its liquid phase.

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