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Heating and Cooling Curve

The document discusses the heating and cooling curves of water, highlighting its high specific heat capacity and the effects of temperature on kinetic energy during phase changes. It includes a data table for plotting a heating curve from -20°C to 120°C and poses critical thinking questions about the graph's regions and comparisons with ethanol. The analysis emphasizes the significance of temperature in determining the lengths of flat regions and slopes on the graph.

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jadeioh27
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27 views1 page

Heating and Cooling Curve

The document discusses the heating and cooling curves of water, highlighting its high specific heat capacity and the effects of temperature on kinetic energy during phase changes. It includes a data table for plotting a heating curve from -20°C to 120°C and poses critical thinking questions about the graph's regions and comparisons with ethanol. The analysis emphasizes the significance of temperature in determining the lengths of flat regions and slopes on the graph.

Uploaded by

jadeioh27
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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States of Matter Activity: Heating and Cooling Curves

Background:

Water molecules have a strong attraction for one another because they are polar. The polarity of water accounts for its
ability to retain heat better than most substances. This means water has a high “specific heat capacity.” Additionally, its
polarity accounts for its relatively high melting point (0oC) and boiling points (100oC).

Analysis:

Use the data in the table to plot a heating curve of temperature vs. time for a 180 gram sample of water as it is heated
at a constant rate from -20oC to 120oC. Connect the dots (do NOT draw a line of best fit)

Data: Thinking Critically:

TIME AND TEMPERATUREDATA FOR 1. Label the five regions of your graph: GAS, MELT,
WATER GRAPH IS SOLID, BOIL and LIQUID. For each of the five
Time Temp. ATTACHED
regions on the graph, indicate how the
(min) (oC) absorption of heat changes the kinetic energy
0.0 -20
of the water molecules.
1.0 0
2.0 0
3.0 9 2. What would the heating curve of ethanol
4.0 26 alcohol look like? Make a rough sketch of
5.0 42 ethanol’s curve from -120oC to 90oC. Ethanol
6.0 58 melts at -114oC and boils at 78oC.
7.0 71
8.0 83 90⁰
9.0 92 78.4
10.0 98
11.0 100
12.0 100
13.0 100
14.0 100 -114⁰
15.0 100
16.0 100
17.0 100
18.0 100
19.0 100 3. What factors determine the lengths of the flat
20.0 100
regions of the graph and slope of the curve
21.0 100
between the flat regions?
22.0 100
23.0 104 The temperature determines the flat and
24.0 111 slope of the graph. If it being heated up it
25.0 120 starts to curve up, but if it reaches a
consistent temperature, it becomes flat.
4. It stayed at 100oC much longer than it stayed at
0oC, what do you think this means about the
relative melting point and boiling point
energies?

It means that heating up takes


more energy due to taking up
more time of being heated

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