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Thermal Energy Lab(1)

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					Name: _______________________ Hour: ______

Thermal Energy Lab
Purpose: How does the volume of water at a given temperature affect the amount of ice that can melt in it? Hypothesis: As the volume of water increases at a given temperature, the amount of ice that can be melted by that volume of water________________________. Explain why.

Materials:  Paper cups  Marker  Water  Crushed ice

 Thermometer  Strainer  1,000 milliliter beaker  100 milliliter graduated cylinder

Procedure: 1. Obtain 4 paper cups. Label 1 cup each with 50mL, 100mL, 150mL, and 200mL with a marker. 2. Fill each cup with the appropriate amount of water as you labeled on the cup. Obtain all water from the same source (sink near your lab station). Take the temperature of each cup of water. They should be within a 1-2range; you may have to wait a couple minutes for them to stay at a constant temperature. 3. Once the temperatures of the cups have all stabilized, add about 100mL of ice to each cup. Let the cups sit for 5 minutes. 4. After 5minutes, pour the water from each container through a strainer to catch any unmelted ice. Dispose of this ice. 5. Use the beakers and the graduated cylinders to find the amount of water plus the amount of melted ice. Enter this data in your data table. 6. Calculate the volume of ice melted in each given volume of water by subtracting the original volume of water from the final volume of water. 7. Take the final temperature reading for each cup of water. 8. Make a graph of your results on a piece of graph paper.

Data: Starting temperature range of water: ___________________ Initial Volume Volume of water in the cup Volume of ice melted (Final volume – initial volume) Final temperature of water

50 ml 100 ml 150 ml 200 ml

Follow-up Questions 1. What is the relationship between the volume of water and the amount of ice that will melt in it? Why do you think this is?

2. How did the final temperatures compare? Did this result surprise you? Explain.

3. What kind of trend does your graph show for the amount melted and the final temperature? Why do you think it looks this way?

4. Using your graph, what temperature and volume of ice melted would you expect if you tried this experiment with a 250 ml amount to start with?

5. Explain the heat flow between the ice and the water. What temperature changes does this cause in both objects?

6. Which cup had the highest total amount of molecules with kinetic energy present? Why?

7. Which cup had the highest thermal energy? Why? 8. What are some errors that may have occurred in this lab?


				
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posted:12/23/2009
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Jun Wang Jun Wang Dr
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