Experiment 3: Specific Heat
In this lab, you will use a home-built calorimeter to test the specific heat of various objects. With you calorimeter, you will be able to determine the heat lost by a cooling object and the heat gained by the calorimeter assembly when these two systems reach thermal equilibrium. In general, all of your calculations will stem from the conservation of (heat) energy:
Qlost= Qgainedorm1C1?T1= m2C2?T2
Questions:
The heat lost by the hot bolt is equal to the heat gained by the water in the calorimeter. Use the equations provided above and what you know about heat to solve for the specific heat (C) of the steel
What is the specific heat of steel from Table 1? Find the percent error for your calculated specific heat relative to this accepted value.
Comment on your percent error. How could you improve the experiment to reduce this error?
Does the air inside the calorimeter also gain heat? Why do we exclude this from our calculation?
If you were to place a piece of wood and a piece of metal outside to bake in the sun for an hour the metal would feel much hotter than the wood when you touched it. What is the reason for this?
Â
| Â |
| Â |
Materials
3 Styrofoam cups
1 Cup lid
Steel bolt
Thermometer
String
Procedure
- Tie the string to the bolt with about 6-8 inches hanging off. You will use this to transfer the bolt from one cup to another.
- Fill one Styrofoam cup with water until half-full, and place it into a second cup (this is for added insulation). Place the lid on the cup, and allow it to reach room temperature.
- Bring water to a boil (using either the stove or microwave) and transfer about 200 mL to the remaining cup. Place your object into the hot water, and use the thermometer to record the temperature after one minute.
- Transfer the hot object into the calorimeter cup, replace the top and insert the thermometer through the lid. The thermometer should touch the calorimeter water. Record the highest temperature the thermometer reads over the course of a minute or two. This is the temperature at which the bolt and water reach thermal equilibrium.
- Record all temperature values in the table below. The initial temperature of the bolt is the same as the temperature of the hot water right before you transferred it to the calorimeter.
- If you have any other metal objects available, you can find their specific heat values using this method. Repeat the above steps for your additional objects and record your data in Table 2.
Table 2:Specific heat data
Object Ti
(°C) |
Water Ti
(°C) |
Object/Water
Tf(°C) |
Water ?T =
Tf- Ti,water |
Object ?T =
Tf- Ti,obj |
Object
Mass (g) |
| Steel Bolt |
| Object 2 (opt.) |
| Object 3 (opt.) |
|
Answers
Status NEW
Posted 08 Jul 2017 08:07 AM
My Price 12.00
Hel-----------lo -----------Sir-----------/Ma-----------dam----------- Â----------- -----------Â ----------- Â ----------- T-----------han-----------k Y-----------ou -----------for----------- us-----------ing----------- ou-----------r w-----------ebs-----------ite----------- an-----------d a-----------cqu-----------isi-----------tio-----------n o-----------f m-----------y p-----------ost-----------ed -----------sol-----------uti-----------on.----------- Pl-----------eas-----------e p-----------ing----------- me----------- on----------- ch-----------at -----------I a-----------m o-----------nli-----------ne -----------or -----------inb-----------ox -----------me -----------a m-----------ess-----------age-----------
Not Rated(0)