Lab #7 – Heating Up and Cooling Down
Do you remember how long it took for
a cup of hot chocolate to cool before you could take a sip? The hotter the
chocolate, the longer it seemed to take to cool.
Problem
How
does the temperature of a liquid affect how quickly it warms or cools?
Hypothesis
Materials
3 beakers
3 thermometers
Stopwatch
Ice
Hot plate
Procedure
- Use the data table to record the temperature of water in three
beakers every minute from 0 to 10 min.
- Fill one beaker with 100 mL of water. Place the beaker on a hot
plate and bring the water to a boil. Carefully remove the hot beaker from
the hot plate.
- Record the water temperature in your data table at minute 0, and
then every minute for 10 min.
- Repeat step 3 starting with water at room temperature and ice
water.
Results
Ice Water
Time (min.)
|
Temperature ('F)
|
Temperature ('C)
|
0
|
32’F
|
0’C
|
1
|
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2
|
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3
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4
|
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5
|
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6
|
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7
|
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8
|
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9
|
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10
|
Room Temperature water
Time (min.)
|
Temperature ('F)
|
Temperature ('C)
|
0
|
||
1
|
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2
|
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3
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4
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5
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6
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7
|
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8
|
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9
|
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10
|
Boiling Water
Time (min.)
|
Temperature ('F)
|
Temperature ('C)
|
0
|
212’F
|
100’C
|
1
|
||
2
|
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3
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4
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5
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6
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7
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8
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9
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10
|
Analysis
1. Using the ‘F/’C conversion formula, convert your remaining
temperatures and fill in the data table.
°C x 9/5 + 32 =
°F
(°F
- 32) x 5/9 = °C
2.
Construct a line graph for each set
of data: a graph for ice water, one for room temperature water, and one for
boiling water; use only temperatures in Fahrenheit! *Label x-axis, y-axis, and
title*
3.
Combining the data from all of your
results, construct a fourth line graph; use a different color for each
line. Remember to include a key. Use
only temperatures in Celsius! *Label
x-axis, y-axis, and title*
- Calculate the rate of heating or cooling for the water in each
beaker by subtracting the initial temperature of the water from the final
temperature and then dividing by 10 min.
Do this for each set of data i.e. ice, room temp., boiling
Rate=Final (10 min.)
Temp. – Initial (0 min.) Temp.
10
- Infer from your results how the difference between room temperature
and the initial temperature of the water affected the rate at which it
heated up or cooled down.
6.What happened to the temperature of the boiling water? What happened to the temperature of the
ice water? Do you think there will
be a temperature at which they would eventually meet? If so, where do you think it will
be? If not, why not?
7a. What was the independent
variable?
7b. What was the dependent variable?
7c. What should remain constant?
Conclusion
What was your problem?
|
Restate your hypothesis. Was it right? wrong? why or why not?
|
What did you learn in this lab?
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What did you like about this lab?
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What were some challenges you had to deal with?
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What could you do next with this problem? What other tests could you perform?
|
Write down any other additional thoughts, observations, inferences, etc.
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