Lab #7 – Heating Up and Cooling Down

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

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.                   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?

  

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.