Data Sheet: Activity 3 – Heat Transfer and Specific Heat
Activity Data Code: MCQ
Table I – Hot Plate Temperature Settings
Pick two hot plate
... [Show More] temperature settings, one high and one low, for your data runs.
Table II – Heating Time Data
Complete the table below using data found while heating cubes on the hot plate (see step 3 of Activity Procedure under the Procedure tab).
Observations and Questions
[1] Which of the three methods of heat transfer accounts for the rise in cube temperatures?
Conduction
[2] What accounts for the different heating times for each cube?
Table III – Cube and Liquid Equilibrium Data
Complete the table below using data found during step 4 of the Activity Procedure (see Procedure tab). Note: data is provided in Temperature Plots (see Temperature Plots tab).
[1] Describe, in general, the temperature changes of the cube and the liquid after the cube enters the liquid. Is the rate of temperature change constant? If not, provide a possible explanation.
[2] Which methods of heat transfer are responsible for the temperature changes in the liquid? In general, how does the rate of heat transfer (from cube to liquid) compare to the previous case (from hot plate to cube)? Can you think of a general explanation for a rate difference?
[3] Eventually, in all of the trials above, the temperature stops changing. Briefly discuss why this happens. Include in your discussion the role of heat flow, temperature differences, and equilibrium. Use details from one of your temperature plots to help illustrate/support your points.
[4] One of the cases above takes a much longer time to reach a common equilibrium temperature. Can you think of a factor that might be impacting the time to equilibrium? Hint: review your heating times in Table II and see if you can make a connection.
[5] Although each cube starts off at the same temperature they reach different equilibrium temperatures. Why?
Table IV – Heat Transfer and Specific Heat
Complete the table below using results from Table III, data found under the Activity Form tab, and information found in the Background tab. Note: ΔT = final temperature - initial temperature
Tip: the ultimate goal is to determine the specific heat capacity of each cube of material using the knowledge that heat transfer Q occurs between the cube and the liquid. Review the “Specific Heat Capacity and Heat Transfer” section of the Background material to understand how to calculate the heat transfer into the liquid. Once you know the heat transfer into the liquid you will be able to determine the heat transfer from the cube and then its specific heat.
Sample Calculation: Show your calculation of heat transfer into the liquid for the Aluminum cube (trial 1).
Sample Calculation: Show your calculation of heat transfer from the cube for the Aluminum cube (trial 1).
Sample Calculation: Show your specific heat calculation for the Aluminum cube (trial 1).
Observations and Questions
[1] If you had to hold one of these heated cubes in your damp hand for 1 min, which would you pick and why? [Show Less]