H5_3-24-10 - containing your cylinder and then remove your...

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H5: Mixing un-like materials Materials: copper cylinder with hole, hot water, temperature probes, grabber for moving the cylinder, styrofoam cups, room temp water Initial Instructions and questions: Get equal masses of copper and room temperature water. You can probably get a more accurate mass of water by weighing it than by using the measuring cylinder. You will be heating up the copper and then putting it into the room temperature water to determine the equilibrium temperature. At this point make a prediction. Do you think the equilibrium temperature will be the average temperature or closer to one of the initial temperatures? Give your reasoning. Scratch a distinctive mark on the top of your cylinder so you can keep track of it. Use the grabber to carefully place your copper cylinder into one of the two coffee makers. Leave it for at least 10 minutes so that it reaches equilibrium with the water. After 10 minutes, fill a Styrofoam cup half full of hot water from the coffee maker
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Unformatted text preview: containing your cylinder and then remove your cylinder and place it in the cup. Do your regular mixing experiment. You will get the initial cylinder temperature from the water in the cup with it. Put the cylinder into the room temp water, and follow the temperatures. Gently stir with both probes. Since one of your materials is a solid, your temperature vs. time plot will look different from the water mixing experiment. Guide to notes in your lab manual: 1. Did your result agree with your prediction? 2. How are your results the same as those from H3 and how are they different? Discuss in terms of temperature and heat exchange. 3. What do you think caused the difference? 4. If you have time, do another trial, preferable with water at a different temperature, to confirm your result. \ 5. Does the equation we came up with to predict the final temperature when we mixed water still hold? How might we modify it so that it will work with the copper?...
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This document was uploaded on 12/27/2011.

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