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Conduction and Convection Activity Worksheet
Teaching Of Science (SEC 395)
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Name: ______________________________________ Date: ________________________
Student Exploration: Conduction and Convection
Vocabulary: conduction, conductor, convection, insulator
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
- Two pots have been sitting on the stove for a while. One pot has a copper handle and the other has a wooden handle. Which handle would you rather touch? Why?
- One of the pots is filled with soup. The soup at the bottom of the pot is warmed by the stove burner, but how does the soup at the top get hot?
Gizmo Warm-up The Conduction and Convection Gizmo shows two flasks of colored water, one blue and one yellow. Select Copper and Solid chunk from the dropdown lists. (This means the two flasks are separated by a solid piece of copper, and the two liquids cannot touch each other.)
- Use the sliders to make one flask hotter than the other.
Click Play ( ). What happens? __________________
- Select the DATA tab and look at the graph. What do the blue curve and the yellow curve represent?
A. The blue curve represents ______________________________________________
B. The yellow curve represents ____________________________________________
- What is the final temperature of the top flask? ____________ Bottom flask? ____________
Activity A:
Conduction
Get the Gizmo ready: Click Reset ( ). Set the Initial temperature of the top flask to 95 °C and the bottom flask to 5 °C.
Question: Conduction is the transfer of heat from one object to another by direct contact. Which materials conduct heat most easily?
Observe : Run the Gizmo twice – once with a Solid chunk of Copper separating the liquids, and once with a Solid chunk of Stone. Watch how quickly the temperatures of the liquids change in both cases. (Note: This solid chunk keeps the liquids from mixing.)
Form hypothesis : A conductor allows heat to flow easily, while an insulator resists heat flow. In general, what kinds of materials do you think are good conductors?
- Predict : Of the six substances in the Gizmo, which ones will allow the fastest temperature
change in the two flasks? ____________________________________________________
- Experiment : Experiment with all six Solid chunks. For each, click Fast forward ( ) and then, after about 500 seconds, Pause ( ). Record the temperature of each flask.
Connection
Initial temp. (top flask)
Initial temp. (bottom flask)
500 sec. temp. (top flask)
500 sec. temp. (bottom flask)
Solid copper 95 °C 5 °C
Solid gold 95 °C 5 °C
Solid lead 95 °C 5 °C
Solid stone 95 °C 5 °C
Solid glass 95 °C 5 °C
Solid rubber 95 °C 5 °C
- Analyze : What substances conducted heat the best? _______________________________
How do you know? _________________________________________________________
- Draw conclusions : What do the best conductors have in common? ____________________
Activity C:
Conduction vs. convection
Get the Gizmo ready: Set the Initial temperatures of the top flask to 30 °C and the bottom flask to 70 °C. Select Gold from the dropdown list.
Question: Which works more quickly, conduction or convection?
Observe : Experiment with a Hollow pipe of Gold and a Solid chunk of Gold separating the flasks. Compare how quickly heat is exchanged.
Form hypothesis : Heat can be transferred by conduction or convection.
A. Which process do you think is quicker? ____________________________________
B. Why do you think this is so? ____________________________________________
- Experiment : For each of the situations below, record the temperatures after 100 seconds.
Connection
Initial temp. (top flask)
Initial temp. (bottom flask)
100 sec. temp. (top flask)
100 sec. temp. (bottom flask)
Solid gold 30 °C 70 °C
Hollow gold 30 °C 70 °C
Solid gold 70 °C 30 °C
Hollow gold 70 °C 30 °C
- Draw conclusions : Does convection always work more quickly than conduction? Explain
why or why not. ____________________________________________________________
- Extend your thinking : You may have noticed that there was a big difference in the results of the two hollow pipe experiments, but very little difference in the solid chunk experiments.
Why do you think this was the case? ___________________________________________
Conduction and Convection Activity Worksheet
Course: Teaching Of Science (SEC 395)
University: Pennsylvania Western University, California
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