Experiment 2 Discussion Questions Calorimetry and Hess's Law

Experiment 2 Discussion Questions Calorimetry and Hess's...

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Experiment 2: Enthalpy of Chemical Reactions - Hess’s Law Discussion Questions 50 points 1. What were the objectives of the experiment? (10 points) Part I. 2. Briefly describe how the change of enthalpy of reaction was determined for reaction 3 in part 1 of the experiment? Were the three reactions endothermic or exothermic? How did you know that the reactions were endothermic or exothermic? (10 points) 3. How did the calculated value of reaction 3 in the pre-lab compare to your experimental value as determined by the summation of reactions? Suggest ways of improving your results. (10 points)
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Unformatted text preview: Part II. 4. Briefly describe how the enthalpy of formation of magnesium oxide was determined. Were the reactions in part II endothermic or exothermic? How did you know that the reactions were endothermic or exothermic? Why was it necessary to use two different concentrations of HCl in the reactions? (10 points) 5. How did the experimental calculated value of the change of enthalpy of formation of magnesium compare to the accepted value? Does this experiment process support Hess’s Law? Suggest ways of improving your results. (10 points)...
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This note was uploaded on 03/19/2011 for the course CH 204 taught by Professor Leytner during the Spring '08 term at University of Texas.

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