Fall09. Final

Fall09. Final - CHEMISTRY 2101...

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Unformatted text preview: CHEMISTRY 2101 Name___________________________ Fall 2009 Dr. Philippe Buhlmann Final Exam December 19, 2009 Page 1 FINAL EXAM There are 8 pages with problems to this exam. Put your name (or initials on subsequent pages) at the top of EACH PAGE ! Show your work! Problem Points Possible Your Score 1 30 2 15 3 20 4 15 5 30 6 10 7 30 Total 150 We will correct everything that we can read—promised! Answer the whole question but be succinct! Manage your time! Move on if you get stuck with a problem. h = 6.6262 10-34 J s 1 eV = 1.6022 10-19 J At 25 ºC: ln(10) RT/F = 2.303 RT/F = 59.16 mV CHEMISTRY 2101 Name___________________________ Fall 2009 Dr. Philippe Buhlmann Final Exam December 19, 2009 Page 2 1 (30 points) Statistics (a) (7 points) The As content of a sample was determined in four measurements as 3.102%, 3.076%, 3.024%, and 3.030%. What final answer should be given? For the associated uncertainty level choose the 95% confidence level. (b) (8 points) Using the Grubbs test, decide whether the value 0.195 should be rejected from the set of results 0.217, 0.224, 0.195, 0.221, 0.221, 0.223. (c) (15 points) The bromide concentrations in 4 tomatoes determined as: 777; 790; 759; 790 µ g/g The bromide concentrations in 4 potatoes determined as: 782; 773; 777; 764 µ g/g Is there a statistically relevant difference (at the 95% level) between the bromide concentrations in these tomatoes and potatoes? CHEMISTRY 2101 Name___________________________ Fall 2009 Dr. Philippe Buhlmann Final Exam December 19, 2009 Page 2 1 (30 points) Statistics (a) (7 points) The As content of a sample was determined in four measurements as 3.102%, 3.076%, 3.024%, and 3.030%. What final answer should be given? For the associated uncertainty level choose the 95% confidence level. (b) (8 points) Using the Grubbs test, decide whether the value 0.195 should be rejected from the set of results 0.217, 0.224, 0.195, 0.221, 0.221, 0.223. (c) (15 points) The bromide concentrations in 4 tomatoes determined as: 777; 790; 759; 790 µ g/g The bromide concentrations in 4 potatoes determined as: 782; 773; 777; 764 µ g/g Is there a statistically relevant difference (at the 95% level) between the bromide concentrations in these tomatoes and potatoes? CHEMISTRY 2101 Name___________________________ Fall 2009 Dr. Philippe Buhlmann Final Exam December 19, 2009...
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This note was uploaded on 10/02/2011 for the course CHEM 2101 taught by Professor Bulman during the Spring '11 term at Minnesota.

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Fall09. Final - CHEMISTRY 2101...

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