Phase Of Matter Lab

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In this lab, you will do the traditional heating of H₂O from its solid phase (called ice) through the liquid phase (called water) to its gas phase (called water vapor or steam). Instead of making an X-Y graph with temperature and energy, you will simply look at time. Time will be equivalent to total energy (since the hot plates will be at some condition) and you observe what phase the material is in over time.

For this experiment, the mass of H₂O is held constant and Pressure is constant

Directions:
1. Put the hot plate as high up as possible (if not already done).

2. When hot plate is at maximum heat, add two ice cubes (enough for bottom of container, no ice cube is sitting onto of another ice cube) into a 250ml beaker.

3. Immediately, place the 250ml beaker onto the hot plate and start recording time with stopwatch.

4. When all ice melts, record length of time on data table below.

5. Start recording time and stop when you see full boiling occurring. Record time on data table.

6. Start recording again and stop when only a little amount of "water" is at bottom of container. Theoretically, we should not stop recording time until all "water" is removed. However, I am afraid that the glass beaker will crack (mostly likely not since it is Pyrex).

Data Table

1. Length of time for solid to melt: __________________

2. Length of time from liquid phase to start of rolling boil: ______________________

3. Length of time after rolling boil started and "all liquid is gone": ______________

Observations:

Questions:

Which took the longer time (i.e. needing the most energy)?