Lab #13 – Heating Up and Cooling Down

LAB #9 – Heating Earth’s Surface

Problem – How do the heating and cooling rates of soil and water compare?

Hypothesis  

Materials – 2 thermometers, 2 beakers, soil, water, lamp with 150 Watt bulb, stopwatch

Procedure –

1.       Fill one beaker with water and one with soil.

2.       Put a thermometer in each of the beakers.

  

Results 

	Temperature With Light On ('C)			Temperature With Light Off (‘C)
Time (min.)	Soil	Water	Time (min.)	Soil	Water
0			0
1			1
2			2
3			3
4			4
5			5
6			6
7			7
8			8
9			9
10			10

  

Analysis

1.   (Draw two graphs; graph 1 compares data from Temperature with Light On and graph 2 compares data from Temperature With Light Off.)

2.   Calculate the total change in temperature (‘C) for each material.  Compare/Contrast the changes in temperature for soil vs. water.

3.   What does the “soil” represent on Earth?  What does the “water” represent on Earth?

4.   How does what you have learned in this lab relate to weather and the formation of wind?  (Hint: think High and Low pressure)

Conclusion 


(Write a summary of your experiment (One full page!).


  Was your hypothesis right?  What did you learn?  


What could you do next time?  Was it fun?  How is this 


related to what we are learning in class?)

Lab #13 – 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

1. Use the data table to record the temperature of water in three beakers every minute from 0 to 15 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
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
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.                   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. 

3.                 

  a. What is the independent variable? 

b. What is the dependent variable?  

c. What are your constants?

4.           

.a         What happened to the temperature of the boiling water?  

b.  What happened to the temperature of the ice water?  

c.  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?

    

Conclusion