Sample Exam 2 - CHE 226 ANALYTICAL CHEMISTRY Spring 2005...

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CHE 226 ANALYTICAL CHEMISTRY Spring 2005 EXAM II – March 10, 2005 Name ______________________________ WRITE YOUR NAME ON EACH EXAM PAGE NOW. THERE ARE 10 QUESTIONS AND 109 POINTS TOTAL IN THIS EXAM . Show clearly all work on these pages. Use the proper number of significant figures and the correct units in all final answers . You must show your calculations and/or reasoning, including equations , on a question to obtain any credit; no credit for answers appearing out of the blue. Your work must be understandable at the time it is being graded to obtain any partial credit . Very little will be subtracted for routine arithmetic errors, but all numerical answers must be shown to the proper number of significant figures. Programmable calculators are not allowed, but may not be shared with anyone else. Tables of data and other information that may be useful are appended to the back of the exam. Use the backs of the pages as scrap paper. Anything written on the backs of pages is totally irrelevant to the grading process. Unless otherwise stated, assume all solutions are aqueous, density = 1.0000 g/mL; activity coefficients are unity ( i.e ., activity = concentration); temperature, T = 298 K; K w = 1.008 x 10 -14 . QUESTION 1 ___________ / 8 QUESTION 7 ___________ / 6 QUESTION 2 ___________ / 7 QUESTION 8 ___________ / 6 QUESTION 3 ___________ / 5 QUESTION 9 ___________ /10 QUESTION 4 ___________ /10 QUESTION 10 ___________ /10 QUESTION 5 ___________ /15 QUESTION 6 ___________ /32 TOTAL __________ /109
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Name __________________________________ 1. (8 points) The determination of sulfur contamination in a coal sample yields the following results: 22.23, 22.09, 21.34, 22.10 ppm S. Can any of the measurements be rejected at the 95% confidence level? Show work to support your answer.
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