Intuitive and Rule-based Reasoning in the Context of Calorimetry Warren M. Christensen, Ngoc-Loan P. Nguyen, and David E. Meltzer Department of Physics.

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Intuitive and Rule-based Reasoning in the Context of Calorimetry Warren M. Christensen, Ngoc-Loan P. Nguyen, and David E. Meltzer Department of Physics and Astronomy Iowa State University Ames, Iowa Supported in part by NSF grant #DUE

Physics Students’ Reasoning in Calorimetry Investigation of reasoning regarding calorimetric concepts among students in calculus-based general physics course A free-response quiz was administered to 311 second semester calc-based physics students in an attempt to assess their understanding of calorimetry

Physics Students’ Reasoning in Calorimetry Investigation of reasoning regarding calorimetric concepts among students in calculus-based general physics course A free-response quiz was administered after lecture instruction to 311 students in an attempt to assess their understanding of calorimetry

Pretest Question #1 The specific heat of water is greater than that of copper. A piece of copper metal is put into an insulated calorimeter which is nearly filled with water. The mass of the copper is the same as the mass of the water, but the initial temperature of the copper is lower than the initial temperature of the water. The calorimeter is left alone for several hours. During the time it takes for the system to reach equilibrium, will the temperature change (number of degrees Celsius) of the copper be more than, less than, or equal to the temperature change of the water? Please explain your answer. Written pretest given after lecture instruction completed

Pretest Question #1 Solution Notation:  T  absolute value of temperature change and

Pretest Question #1 Solution and Notation:  T  absolute value of temperature change

Pretest Question #1 Results Second-semester calculus-based course (PHYS 222) LSH = lower specific heat GSH = greater specific heat (five different versions of question were administered)

Pretest Question #1 Results Second-semester calculus-based course (PHYS 222) LSH = lower specific heat GSH = greater specific heat (five different versions of question were administered)

Example of Incorrect Student Explanation “Equal, to reach thermal equilibrium the change in heat must be the same, heat can’t be lost, they reach a sort of ‘middle ground’ so copper decreases the same amount of temp that water increases.” “Equal energy transfer” is assumed to imply “equal temperature change”

Example of Incorrect Student Explanation “The temperature change of copper will be less than that of the  T of the water, because the specific heat of water is greater, and the masses are the same.” “Greater specific heat” is assumed to imply “Greater temperature change”

Suppose we have two separate containers: One container holds Liquid A, and another contains Liquid B. The mass and initial temperature of the two liquids are the same, but the specific heat of Liquid A is two times that of Liquid B. Each container is placed on a heating plate that delivers the same rate of heating in joules per second to each liquid beginning at initial time t 0. Pretest Question #2

t0t0 Time Temperature Liquid ALiquid B The specific heat of A is greater than the specific heat of B. Heating Plate Pretest Question #2 Graph [ c A = 2c B ]

Pretest Question #2 (cont’d) On the grid below, graph the temperature as a function of time for each liquid, A and B. Use a separate line for each liquid, even if they overlap. Make sure to clearly label your lines, and use proper graphing techniques. Please explain the reasoning that you used in drawing your graph.

t0t0 Time Temperature Liquid ALiquid B The specific heat of A is greater than the specific heat of B. Heating Plate Pretest Question #2 Graph [ c A = 2c B ]

t0t0 Time Temperature Liquid ALiquid B The specific heat of A is greater than the specific heat of B. Heating Plate Liquid A Liquid B Pretest Question #2 Graph [ c A = 2c B ]

Pretest Question #2 Results (N = 311) Correct (Slope of B > A) with correct explanation 70% 50% Second-semester calculus-based course (PHYS 222)

Pretest Question #2 Results (N = 311) Correct (Slope of B > A) with correct explanation Incorrect Slope of B < A Other 70% 50% Second-semester calculus-based course (PHYS 222) 28% 2%

Where did the  T LSH =  T GSH errors go?

Where did  T LSH <  T GSH errors come from?

Switching Explanations and Rule-Based Reasoning Many (  25%) incorrect explanations to Q1 fell into one of three well-defined categories Incorrect explanations frequently had very similar phrasing Most students giving incorrect explanations were inconsistent in their responses to Q1 and Q2  This suggests that students are employing context- dependent rule-based reasoning

Follow-up Interviews Math errors appeared more frequently than on the free response quizzes (~25%) Few conceptual errors observed –Due to small sample size and self-selection factors?? (N = 26) Summer and Fall 2003 (Different instructor and class format)

Mathematical Errors Errors resulting from manipulations of equations (such as Q = mc  T) Not necessarily indicative of poor conceptual understanding (based on evidence of interview responses) Not often seen in answers to free response quizzes –Interviews allow us to probe student responses in depth Apparently a significant source of student confusion

Conclusion Students’ reasoning in calorimetry often appears to be based on intuitive context- dependent rules. Weak mathematical skills often appear to function as a roadblock to qualitative understanding.