Experiment 9

SPECIFIC HEAT

ANALYSIS

1.  Compute the temperature rise experienced by the cold water, cup and stirrer, (Tf - Tc), and enter in cell E24 on the Worksheet.

2.  Compute the temperature decrease experienced by the metal shot, (Th - Tf), and enter the result in cell E25.

3.  Using the measured masses of water and the cup-stirrer, and the given specific heat of the material out of which the cup-stirrer is made, use the relation below to compute the heat gained by the cold bodies during the experiment:

ΔQcold = mw cw ( Tf - Tc) + mcsccs ( Tf - Tc )

Enter the result in cells E27 on the Worksheet.

4.  The heat lost by the hot metal shot is equal to the heat gained by the cold bodies computed above. Divide the total heat lost by the mass and the temperature change of the hot metal shot as it appears in cell E25 to obtain a value for the specific heat of the metal shot cm.

Enter the results in cell E30 on the Worksheet.

5.  Compare the measured specific heat of lead with the accepted value that appears on your Worksheet by calculating the percentage error and entering it in cell E32 on the Worksheet.

6.  Answer Questions 1 and 2 on the Worksheet and complete your lab report.