Lab #6 – Heating Up and Cooling Down

Lab #6 – 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?  Why do hot drinks come in styrofoam or special paper cups?  Why do teachers drink hot drinks out of porcelain mugs?  Why not glass, metal, or plastic cups?

Problem

There is a beaker of ice water in front of you; what will happen to it over time?

There is a beaker of room temperature water in front of you; what will happen to it over time?

There is a beaker of boiling water in front of you; what will happen to it over time?

Hypothesis

I predict that if I leave a beaker of ice water out then this will happen.... because....

I predict that If I leave a beaker of room temperature water out then this will happen....   because.... I predict that If I leave a beaker of boiling water out then this will happen....   because....

      

  Materials

3 beakers

3 thermometers

Online Stopwatch

Ice

Hot plate

Procedure

1. Use the data table to record the temperature of water in three beakers every minute from 0 to 10 min.
2. 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.
3. Record the water temperature in your data table at minute 0, and then every minute for 10 min.
4. 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.   Use your data tables to construct four line graphs.
a.   Ice Water: x-axis - Time (min),
 y-axis - temperature (oF)
b. Room Temperature Water: x-axis - Time (min),
 y-axis - Temperature (oF)
c. Boiling Water: x-axis - Time (min), 
y-axis - Temperature (oF)
d.    Construct a fourth line graph using the data from all three data tables; there should be three lines: ice water (colored blue), room temperature, and boiling water (colored red).

Example of line graph for c. temperature change in boiling water shown below

2.    What happened to the temperature of the boiling water over time?  Explain your answer.

3.    What happened to the temperature of the ice water over time?  Explain your answer.

4.    What happened to the temperature of the room temperature water over time?  Explain your answer.

5.    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?

6. Think Deeper: Why is the title of this lab called "Heating Up and Cooling Down" ?
7. Go Beyond: Illustrate the three beakers, label them, draw "heat arrows" showing the flow of thermal energy from the higher temperature substance to the lower temperature substance.  

Edit: I am aware that you all did not complete this lab on your own.  Please watch the videos, and complete the Conclusion based on the videos, the graphs, and theAnalysis responses.

Conclusion

What was your problem?  Restate your hypothesis.  Was it right? wrong?  why or why not? Did you change your hypothesis in the middle of your investigation?  If so, why? How is this investigation connected to 'real life'?    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.