Help with question 4 What is the accuracy of your results for the specific heats
ID: 1336018 • Letter: H
Question
Help with question 4 What is the accuracy of your results for the specific heats of the metals? Can you surest any change m the original temperature of the metal that would improve the results? Can you make a quantitative statement about the precision of your results? If you can make a statement about the precision, do so. If you cannot make any statement about the precision, suggest what measurements would allow you to do so. Suppose the shot were wet and thus included some water at the same temperature as the shot when it was placed in the calorimeter. How would this affect the results? What would the change in temperature of the water have been if 200 g of water had been used with each of the samples? Would this have tended to improve the results, tended to make the results worse, or tended to have no effect on the results?Explanation / Answer
(1)
To obtain more accurate results for the specific heat of metal you should use water with initial temperature slightly lower than room temperature.
Make a few trials with water at different original temperatures and prefer the one where room temperature is halfway between the original and the final temperature of the water.
In this case, you can practically imagine that the contents of the calorimeter gained and lost equal quantities of heat to the surroundings as net transfer zero.
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(4)
If you add to the water, then the thermometer reading did not change immediately as themal energy took some time to transfer to the thermometer fluid.
As time the thermometer reached equilibrium with the water, the water by now cooled to some extent by energy loss to the surroundings. This thermal lag error of the thermometer might be results in the too low final calculated temperatures
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