211_midterm_1_Su05 KEY

211_midterm_1_Su05 KEY - KEY (tables were provided; Harvey...

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1 KEY (tables were provided; Harvey tables) Partial Credit was given on all problems if deemed appropriate. Sig figs were checked, typically worth 1-2 points depending on the problem. As stated in class many times, if one did not state the assumptions (or did not recognize the assumptions being made), &/or if one did not test your assumptions, the score was lowered significantly. If you did not show your work, points were deducted. Final answers many times differed slightly from the Key based on assumptions; however, as long as the assumptions met the < 3% rule, this of course was acceptable. Midterm I Chemistry 211 July 20 th , 2005 – 200 Points You must show all of your work . 1. (15 points) Calculate the uncertainty in the answer of: (1025 ± 8) (636 ± 4) + (127 ± 2) s=9 2. (20 points) An iron analysis from an iron ore sample was obtained using a high sensitivity instrument, the Inductively Coupled Plasma Mass Spectrometer. F ive Six Fe measurements were obtained: 2.04, 2.15, 2.12, 1.96, 1.94, and 1.93. Report the confidence interval with a 95% confidence level. Qtest first for outliers µ = 2.02 ± 0.10 or 1.92 to 2.12 3. (15 points) A research chemist at the National Institute of Standards and Technology (NIST) tested a new analytical method for measuring the concentration of potassium in samples of
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211_midterm_1_Su05 KEY - KEY (tables were provided; Harvey...

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