Fall 05. Exam1

Fall 05. Exam1 - Chemistry 2101 Midterm #1 September 30,...

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Chemistry 2101 Midterm #1 September 30, 2005 Name: ________________________________ Student #: ______________________________ 1. _________ / 8 2. _________ / 9 3. _________ / 6 4. _________ / 6 5. _________ / 12 Total : _________ / 41 Page 1 of 8
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1) (8 Points) Use propagation of error to determine the uncertainty in the answers to the following mathematical calculations: a) (5.12 ± 0.04) + (106.91 ± 0.06) – (0.07 ± 0.05) = b) () ( ) 0.001 0.004 20 1550 7 51 = ± × ± ± Page 2 of 8
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2) (9 Points) A student measures the absorbance of a solution six times and records the following readings: 1.206, 1.528, 1.381, 1.115, 1.298, 1.366 and 1.172. a) Use a statistical test to determine if the outlier should be rejected. b) Find the mean and 95% confidence interval of the data set. Page 3 of 8
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3) (6 Points) A new gas chromatograph is being installed in a lab. Before shutting the old instrument down researchers wanted to determine if the new instrument gave identical results as the old instrument. The following measurements were made on a standard solution: Old GC: 5.65, 5.32, 5.78, 5.72, 5.46 New GC: 5.22, 5.42, 5.35, 5.25, 5.39 Use a statistical test to determine if the two methods give significantly different results at the 95% confidence level.
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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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Fall 05. Exam1 - Chemistry 2101 Midterm #1 September 30,...

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