Thermal Energy Lab

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					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 600mL beakers, crushed ice, water, thermometer, paper cups. Procedure 1. Obtain 4 paper cups. Label 1 cup each with 100mL, 200mL, 300mL, and 400mL. 2. Fill each cup with the appropriate amount of water. Obtain all water from the same source. Take the temperature of each cup of water. They should be within a 1-2 range. 3. Once the temperatures of the cups have all stabilized, add about 200mL 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 the grid provided below. Data Starting temperature range of water: Volume of water in cup 100mL 200mL 300mL 400mL Final volume of water Volume of ice melted (Initial volume – final volume) Final temperature of water

Conclusions 1. What is the relationship between the volume of water and the amount of ice that will melt in it? 2. How did the final temperatures compare? Did this result surprise you? Explain. 3. Every molecule in a volume of water at a certain temperature has a certain amount of energy. Use this information to explain at a molecular level why a larger amount of water can melt a larger amount of ice than a smaller amount of water at a certain temperature. 4. You need to dissolve a refrigerator-sized block of ice, left over from your barbeque at the lake. Your friend suggests that you pour boiling water over the ice. Give an alternative suggestion that might take less time.

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Heat is the energy transferred between two objects. Which has more heat- 50mL of water at 23C or 340mL of water at 23C ? Explain your answer in terms of the molecules of in the water. Alternative set-up Instead of using thermometers, you can use temperature probes. This reduces clean-up and risk of breakage. Please keep in mind that the resolution of temperature probes is around  0.2 C, so students should round to the tenths place. To set up the temperature probe, students should link their calculators to the CBL unit with a link cable. The PHYSICS program should e selected from the program menu. When the calculator displays the main menu screen on the calculator, select “1:Set Up Probes.” Select “1:One” as the number of probes, and “6: Temperature” as the type of probe. When you return to the Main Menu, select “2: Collect Data.” Select “2: Monitor Input.” At this point, the probe can be moved from cup to cup and used in the same manner as a thermometer. When all data is collected, students should press the plus button on their calculator to end data collection, select “return to main menu” from the data collection window and then “quit” from the main menu.

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