EXPERIMENT 9 SPECIFIC HEAT OF A METAL PRE-LAB Name 1. Suppose the thermometer us

Question

EXPERIMENT 9 SPECIFIC HEAT OF A METAL PRE-LAB Name 1. Suppose the thermometer used in the procedure described in this experiment was in error-all readings were just 1.0 degree low. What effect would this have on the calculated specific heat of the metal; would it make it too high? too low? or have no effect? Explain. 2. Why is it better to use just one thermometer to read all the temperatures rather than to have one for the metal and another for the water in the calorimeter? 3. Use the Law of Dulong and Petit to estimate the specific heat (in J/g"C) of aluminum. Show calculations. 4. Using this estimated value for the specific heat of aluminum, calculate how many grams of the metal should be taken for this experiment. Assume a) that the metal is heated to 98.0°C; b) the calorimeter contains 20.0 g of water, c) the initial temperature of the water is 23.0°C; and d) you want the temperature of the water to rise by 10.0 degrees. Show calculations. 5. Now repeat Questions 3 and 4, but substitute iron for aluminum. 81

Explanation / Answer

Ans 1. As Heat lost by metal = specific heat of metal × mass of metal × change in temperature

As we are dealing with only change in temperature , so , if the readings are 1° low , then it has negligible effect on the change in temperature and has negligible effect on the calculated value of specific heat of metal .

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