Heating Curve Lab
Name:_____________________
Lab Table: __________
Safety:
You must wear goggles at ALL times during this lab.
Hot glassware looks just like cool glassware
Directions:
1. Fill a 400 mL beaker with ice. Add just enough tap water to cover the ice.
2. Place the beaker onto the hot plate.
3. Suspend the thermometer as deep in the ice water as possible without the bulb touching the bottom
or sides.
4. Turn the hot plate onto high.
5. Record the beginning temperature of the ice water.
6. Read and record the temperature after each minute into the data table provided.
7. When the water has been boiling for 5 minutes, you may stop recording and turn off the hot plate.
8. Allow the beaker and water to cool in place.
Data:
Time
0 min
1 min
2 min
3 min
4 min
5 min
6 min
Temperature
Time
7 min
8 min
9 min
10 min
11 min
12 min
13 min
Temperature
Time
14 min
15 min
16 min
17 min
18 min
19 min
20 min
Temperature
Time
21 min
22 min
23 min
24 min
25 min
26 min
27 min
Temperature
Graph your data on the given graph paper. Make sure you attach it to this paper to turn in.
Label your heating curve graph correctly. Make sure your graph has a title, and both axes are labeled
including units.
Label these parts on your graph:
1. Ice (Solid)
2. Melting point
3. Liquid water
4. Boiling point
5. Gas
Conclusions:
1. What temperature did your ice melt at? Explain how you know.
2. What temperature did your water boil at? Explain how you know.
3. Were the phase changes you observed today exothermic or endothermic and why?
4. If you were adding thermal energy the whole time, why did you have periods where your
temperature did not change much? (What was the thermal energy doing during those time
periods?)
Heating Curve of Lauric Acid
90
you chose this temperature from the
graph.
60
(de
gre
es
does Lauric acid change from a solid to a
liquid? ____________ Describe why
70
50
Tempera
ture
5. Look at this graph of a waxy material
called Lauric Acid. At what temperature
Celsi
us)
80
40
30
20
10
0
0
5
10
15
20
25
Heating Time (minutes)
Using your chrome book or cell phone: Look up the definition of Latent Energy and define below
in your own words:
30