Chemistry Worksheet Name: ___________________________
Heating-Cooling Curves and Calorimetry Block: ___________
Figure 1
Figure 1shows the temperature of 1.00 kilograms of ice (H2O) starting at −20 °C that is heated at a constant rate
of 100 Joules per second (100 J/s). After about 8.6 hours, the ice has become water vapor (still H2O!) at 120 °C.
There are five distinct regions in the curve, each of which has an arrow nearby.
1. Above each arrow write what is happening to the H2O in that region. (See the example for the first
region.)
2. Below each line, write the algebra equation that is used to calculate the heat (q) for that region. Label
the heat (q2, q3, q4, q5) in order from left to right. (See the example for the first region.)
3. For each of the five regions, use your
equation and the information provided
in the figure 1 caption and in table 1 to
calculate the heat for each region using
the numerical information. Complete
your calculations on the next page – be
sure to show your work and include all units with each calculation. Record your results in the appropriate
answer blank. Use a separate piece of paper if you need more space. Keep the paper with this worksheet.
-40
-20
0
20
40
60
80
100
120
140
0 1 2 3 4 5 6 7 8 9 10
Temperature, Celsius
Time, hours
Heating Curve for Water
Ice warming
q1 = mice cice ΔTice
Table 1: Key thermochemical data for water
Cice =
2.11
J/(g C)
∆Hf =
333.6
J/g
Cwater =
4.18
J/(g C)
∆Hv =
2256
J/g
Csteam =
2.08
J/(g C)
qtotal = q1 + q2 + q3 + q4 + q5
