H O phase change
Lab
2
Mitchell Harms, 10/7/13, Per 4.
Background
I
f you have a frozen solid liquid and add heat, it
will become a pure liquid. To start off the lab we had a beaker filled with ice and added heat
and checked it every 30 seconds for roughly 12 minutes. The lab was fun and successful; I
wander when the melting point will occurred in the experiment?
Hypothesis
If you heat a solid liquid, it will eventually melt into a liquid. There will also be a period where
the temperature will stay the same that means the solid is changing into a liquid.
Procedure
1. Prepare a data table to collect measurements for the lab. Be sure to put the dependent
and independent variables in the correct place.
2. Fill the beaker with ice, then add a small amount of water ( about 25 mL)
3. Place the beaker on the hot plate with the hot plate TURNED OFF.
4. Take two temperature measurements of the ice/water slurry 30 seconds apart.
5. Do not let go of the thermometer.
6. Do not let the thermometer touch the beaker sides or bottom.
7. Turn on the hot plate to about 6 (about half-way).
8. Collect temperature measurements every 0.5 minutes (30 seconds).
9. When the ice has completely melted, turn the hot plate to HIGH.
10. Continue to collect temperature measurements every 0.5 minutes until the water has
been boiling for about 3 minutes or you have collected 6 (six) temperature
measurements that are within 0.5 degrees of each other.
11. Do not let the beaker go dry. Stop the experiment, turn off the hot plate and notify the
teacher if your beaker is close to going dry.
12. Turn off the hot plate and pour the water down the sink.
13. Graph your data, x –axis as time and y-axis as temp. Use the whole piece of graph
paper.
14. Draw a best fit line through each section of the graph where the slope of the data is
different.
Results
Times—Temp(C)
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0—2
30—1
60—0
90—8
120—11
150—11
180—13
210—15
240—18
270—20
300—25
330—30
360—37
390—45
410—52
440—61
470—70
500—79
530—86
560—92
590—97
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610—98
640—99
670—99
700—99
Analysis
1. Label your graph to indicate the different phases of water.
2. What is happening to the water during the “flat” areas in the graph?
The water is staying the same temperature.
3. What is happening to the water during the slanted areas in the graph?
The water is melting from a solid to a liquid when the temperature rises on the hot plate.
4.
In what areas of the graph is there more than one phase of water present?
From 2 minutes all the way to 3 and a half minutes.
5. What is happening to the heat from the hot plate when the water is changing from ice to
liquid?
The hot plate is getting hotter and hotter, heating up the solid ice.
6. What is happening to the heat from the hot plate when the water is a liquid only?
The water heats up and starts to boil.
7. How would the graph look different if you had twice the amount of water?
The ice would take longer to melt and the water would take longer to boil creating the flat part in the
chart later up the graph.
Conclusion
The ice melted and the water boiled all in less than 12 minutes. The numbers started low but as
heat was introduced the solid ice started to melt creating more water and once all the ice melted
the water got warmer and started to boil.