The purpose of this lab is to determine the identity of an unknown metal, and to prove whether the laws of thermodynamics hold when determining this identity. ” By extreme_Fred Thermodynamics Lab Purpose: The purpose of this lab is to determine the identity of an unknown metal, and to prove whether the laws of thermodynamics hold when determining this identity. Using the accepted specific heat of water (4186 J/keg ; co), heat flow between two different sets of water though the conduction of an unknown metal can provide useful data in determining the identity.
The heat transfers can be calculated to approximate the specific heat of the unknown metal. When heat is transferred to an object, the temperature of the object increases. When heat is removed from an object, the temperature of the object decreases. The relationship between the heat (q) that is transferred and the change in temperature (DOT) is: q = ranch = ms ; (TFH- It). After the specific heat of the metal is found, it can then be compared to known specific heat values of various metals, which in turn will allow for a probable identity of the unknown metal to arise.
Conclusion: water increased in temperature, while the hot water decreased. The two liquids underwent changes in temperature until they both reached thermal equilibrium. This thermodynamics law is called the Zero Law of Thermodynamics. This law basically states that two bodies will naturally reach thermal equilibrium when in contact. The First Law of Thermodynamics was obeyed as well. Only heat from the warmer body went to the colder body. Heat only travels in one direction, from the hot to the cold, as can be seen from the graph.
My hypothesis of the unknown metal being aluminum was correct. The results of my lab showed that the unknown metal was aluminum, and later it was said that the metal had in fact been aluminum. The lab calculations went well. The values were somewhat disparate however. For example, the specific heat was found to be 1200 В± 110 J/keg ; co, but the actual specific heat of aluminum is 900 J/keg ; co. This difference can be attributed to the imperfect insulation of the calorimeters. Some heat must have been lost during the experiment, which may have caused a distortion in values as a result.
Also, the metal was exposed to the outside air, and likely lost some heat to the air. Overall, the lab was a success. The only improvements I would suggest are to have better insulators and more precise instruments. Better insulation would yield improved results. The metal, which was transferring the heat, should have been insulated so that heat could not escape during the heat transfer. More precise instruments would cut down on the uncertainties, which then would allow for better and more accurate results.
