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
100 mL Graduated Cylinder
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
|
||
2
|
||
3
|
||
4
|
||
5
|
||
6
|
||
7
|
||
8
|
||
9
|
||
10
|
Room Temperature water
Time (min.)
|
Temperature ('F)
|
Temperature ('C)
|
0
|
||
1
|
||
2
|
||
3
|
||
4
|
||
5
|
||
6
|
||
7
|
||
8
|
||
9
|
||
10
|
Boiling Water
Time (min.)
|
Temperature ('F)
|
Temperature ('C)
|
0
|
212'F
|
100’C
|
1
|
||
2
|
||
3
|
||
4
|
||
5
|
||
6
|
||
7
|
||
8
|
||
9
|
||
10
|
Analysis
1.
Graph your data for all four
beakers; use only your temperatures in Fahrenheit! Use a different color for each beaker.
2.
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.
3.
What happened to the temperature of
the boiling water?
4.
What happened to the temperature of
the ice water?
5.
What happened to the temperature of
the room temperature water?
6.
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?
7. What was your independent variable?
8. What was your dependent variable?
9. What remained constant?
7. What was your independent variable?
8. What was your dependent variable?
9. What remained constant?
Conclusion
What was your problem?
|
Restate your hypothesis. Was it right? wrong? why or why not?
|
What did you learn in this lab?
|
What did you like about this lab?
|
What were some challenges you had to deal with?
|
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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