Thermodynamics+Project

Thermodynamics+Project - Inquiry into Calorimetry and Heats...

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Inquiry into Calorimetry and Heats of Reactions Dr. Charlie Cox © 2008 1 Chem 1310 HP Inquiry into Calorimetry and Heats of Reactions Now that you are a more accomplished chemist, it is time to try a more project oriented and student driven lab experiment. In lieu of providing detailed guidelines, this experiment will be more inquiry or research-based. Students will be responsible for designing the experiment. A pre-lab proposal for this experiment is due in advance, and the graded proposal must be corrected with the suggestions made by the instructor before the start of the experiment. A full laboratory report will be required as the post-lab for this experiment. Experiment Objectives: Illustrate heat transfer and reiterate the first law of thermodynamics. Emphasize independence in the laboratory through the use of an inquiry-based approach. Demonstrate the concept of endothermic and exothermic reactions as discussed in lecture. Utilize both conceptual and mathematical approaches for explaining the observations during the laboratory. The Proposal and Pre-lab assignment : (50 points) During the semester, several general types of reactions were discussed during lecture and laboratory including: 1. Acid-Base Reactions 2. Redox (or Oxidation-Reduction Reactions) 3. Solutions of soluble salts in water 4. Precipitation reactions Propose a plan to measure the heats of reactions for the four reaction types. The proposal should include balanced equations for one reaction from each of the four types indicated above, and a detailed description of how a calorimeter will be designed and the materials needed. Furthermore, for each of the chemical reactions, hypothesize about whether the proposed reaction will be exothermic (give-off heat) or endothermic (take-in heat). The grading of the proposal will be based upon the detail provided and the accuracy of the reactions proposed (e.g. is the acid-base reaction proposed really an acid-base reaction?). The quantities of each reagent should also be included in the proposal. The goal of this experiment is to design a calorimeter to measure the heat produced or lost as a result of a chemical reaction. A calorimeter is an instrument designed to measure heat transfer, and an ideal calorimeter is a good insulator so that the heat transferred during a chemical reaction can be accurately measured.
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Inquiry into Calorimetry and Heats of Reactions Dr. Charlie Cox © 2008 2 The materials available for construction of the calorimeters for this experiment include 1. Styrofoam cups-each group may use up to four Styrofoam cups for their experiments 2. Styrofoam lids/cardboard 3. Thermometers/ TI/CBL2 Thermistors (Either one may be used for the experiment) The following table lists the reagents available for the experiment. Sodium Acetate
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Thermodynamics+Project - Inquiry into Calorimetry and Heats...

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