Experiment 9 Specific Heat Capacity of a Metal

Experiment 9 Specific Heat Capacity of a Metal PowerPoint PPT Presentation


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Goal. To determine the specific heat of an unknown metal using a coffee cup calorimeter.. Background - Calorimetry. Atmospheric pressure is constant DH = qp qsystem = -qsurroundingsThe surroundings are composed of the water in the calorimeter and the calorimeter. qsystem = - (qwater

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Experiment 9 Specific Heat Capacity of a Metal

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1. Experiment 9 Specific Heat Capacity of a Metal

2. Goal To determine the specific heat of an unknown metal using a coffee cup calorimeter.

3. Background - Calorimetry Atmospheric pressure is constant DH = qp qsystem = -qsurroundings The surroundings are composed of the water in the calorimeter and the calorimeter. qsystem = - (qwater + qcalorimeter) For most calculations, the qcalorimeter can be ignored. qsystem = - qwater csystemmsystem DTsystem = - cwatermwater DTwater

4. Background - Calorimetry csystemmsystem DTsystem = - csurroundsmsurrounds DTsurrounds c = specific heat m = mass DT = change in temperature (Tf – Ti)

5. Background - Calorimetry cmetalmmetal DTmetal = - cwatermwater DTwater

6. Background - Calorimetry cmetalmmetal DTmetal = - cwatermwater DTwater

7. Background - Calorimetry cmetalmmetal DTmetal = - cwatermwater DTwater

8. Background - Calorimetry An equation derived by Dulong and Petit can be used to estimate the atomic weight of a metal from the substance’s specific heat.

9. Experimental Procedure There are four main procedures to this experiment Set-up the calorimeter Boil the water containing metal Set-up the GLX computer. Collect the calorimetric data.

10. Background - Calorimeter

13. Calorimetric Set-Up

14. Experimental Procedure – Collecting Data Weigh out approx. 20 grams of unknown metal, place it in a test tube and warm in a hot water bath. Weigh the calorimeter, add approximately 20 mL of water and reweigh the calorimeter and water. After the metal has been in the hot water 5 minutes, start the experiment by pressing “Record” on the GLX and start swirling the liquid in the calorimeter. After one minute, add the hot metal and continue swirling. Discard the water, place the metal in the wet metal beaker, and repeat the experiment.

15. Experimental Procedure – Data Analysis

16. Experimental Procedure – Data Analysis

17. Experimental Procedure – Data Analysis

18. Calculation – Specific Heat

19. Calculation – Specific Heat

20. Calculation – Molecular Weight Estimate.

21. Calculation – Molecular Weight Estimate.

22. Safety Be careful handing hot glassware and metal as they can be hot. Be sure to keep computers and calorimeters away from the hot plates, both can melt when exposed to heat.

23. Waste Disposal Put all metal into containers marked: “Wet Unknown”

24. Quiz Name, Lab day and time

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