Editing AP Questions For AP Hess Lab

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Calculation Section 
 
1. For balanced net ionic reaction you made in the Pre-Lab exercise, show all work to determine the &#916;Hrxn for each reaction. 
 
2. Using your experimental data and heat equation, determine the &#916;Hrxn (per kJ/mol of each reactant) for the 3 reactions (Part I, II, III from lab). Show all work. 
 
3. Now you are going to compare your experimental results verse your theoretical results (you did not Pre-Lab Exercise) for Reaction 3. 
 
a. Experimental information. You are going to write down the first two reactions and their &#916;Hrxn. Then you are going to use Hess' Law to determine the &#916;Hrxn for Reaction 3. 
 
b. Theoretical information. You are going to write down the first two reactions and their &#916;Hrxn calculated from book/theoretical value. Then you are going to use Hess' Law to determine the &#916;Hrxn for Reaction 3. 
 
 
 
Questions Section 
 
1. Compare the Experimental results for Reaction 3 with the theoretical results for this reaction. 
 
 
2. Does the results from your comparison in Q1 support Hess' Law? Explain 
 
 
3. If you recorded the wrong final temperature since that the recorded temperature is less than the actual final temperature, explain how that affects the &#916;Hrxn for that reaction? 
 
4. What are the major error in this experiment and give one way to reduce this function to limit error next time you do this lab.

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