1. In your own words, describe the situation to be studied.
2. List and define any parameters that will be measured directly.
3. List any quantities that will be calculated.
4. List any graphs that will be created in the analysis of this experiment.
1. Read, Understand, and Follow the guidelines for safe use ofthe calorimeter as described in the lab manual. ESPECIALLY the safetywarnings.
2. Bring two sheets of graph paper with you to lab.
2. It is important to rotate the calorimeter at a consistent rate. Use theclock on the wall to judge how fast you crank the calorimeter. I wouldrecommend using 1 complete revolution every second.
3. In Part A the temperature change should be at least 6.0 degrees Celcius. In Part B the total temperature change should be atleast 10 degrees Celcius.
4. In Part B, read the thermometer as quickly and accurately as you can sothat the ambient temperature of the air affects the system as little aspossible.
1. You will not be writing a formal report for this experiment. Rather, youwill be answering the following questions and submitting them to your TA as youleave the room. Have a great Christmas Break.
2. Using equation (1) and your data from Part A of the experiment, determinethe amount of work done in this system.
3. Assuming that all the work done by rotating the calorimeter in Part A went to heating the calorimeter and the water inside, calculate the mechanicalequivalent of heat, J.
4. Plot a graph of temperature versus number of turns for your data fromPart B. If your rotations have been regular and not too fast, your graph shouldshow a distinct bend at room temperature. Explain the shape of the graph.
5. Draw a tangent to the curve at room temperature and use the slope of thattangent to calculate the mechanical equivalent of heat, J.
6. Compare your two values of J to each other and to the accepted value,J=4.184 Joules/calorie.
7. Collect the results of measurements taken by all of the lab groups in theclass. Find the average vlaues. Evaluate your measurement in terms of theaverage value and in terms of the accepted value.
8. Identify the factors that have been included in your calculations of J andalso those that have been neglected. Estimate the size of the contributions ofthose factors that have been excluded.
| Section | Points |
|---|---|
| Graphs | 6 |
| Analysis Questions | 14 |