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quantitative chem lab quiz 3

quantitative chem lab quiz 3 - Z q ‘ CHEM 2285(Spring...

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Unformatted text preview: Z q _/' ‘ CHEM 2285 (Spring 2008) j : Quantitative Analysis Laboratory 2 2) pk Quiz #3 (25 points), Section 002 (TTh) Name: JOSH gag 1000# g 1. (5 pts. ) Briefly explain how you will calibrate a 50 mL buret in experiment 3. 4' I [Ii/«e w/lmam/c chcff—LQ/o Mr?“ ”L ANN“ W’M 7‘“’¢fl%’%7flf’ ”Iq/ / ”infirm/~64”: /L/grl'?€ 9.) ”(M 5234‘ 4/{1 j” '44:: V/i—Q—‘f' fer (‘ ’jV" //€ <,”I +1“: / / ,4. ,J’ r ./"'. /oM/‘£Vclft {42 5:” 7‘,- V"/tu ,! 2/ 4/}! W/Mfluwflwfifl/ M4 0" ME ”FAN" ”‘ 5” J " .«2/ 2. (3 pts.) Find the absolute and percent relative uncertainty for the following operation and express the answer with an acceptable number of significant figures. 6.458 (:1: 0.006) — 4.72 (i 0.02) = '2 [W 10.7, ,92 7 \/ / by /, 7H 3. (2 pts.) Fill in the blanks: In considering propagation of error, you should use a Ego/y -r{ 3 uncertainty for addition and subtraction operations and fleVCCW/ fix/a 7 1'" uncertainty for multiplication and division operations. K/ 4. (5 pts. ) How is accuracy defined? Why do we use quotation marks around the word true in the statement that accuracy refers to how close a measured value 1s to the “true” value? . / ‘ //(,CM""(7 Mgmgwyc’) ,‘x/(MU (.3 .r'r-sj" .rf‘ ~flfi[email protected] L; /ffl M f/“e Vfl/HC (we 4N”. {/42ch fr flfl’fh Value ffiw fr meaiM’w/ Z; (46 0V6" jaJaj «HI/c @A/flé’lfdwxwr, \/ 5. (5 pts.) What is the uncertainty in the molecular mass of 02, if the atomic mass of oxygen is 15.9996 :1: 0.0003 g/mol? 90003)”; : I,JV \3 26 6. (5 pts. ) In the given target models below (the center represents the “true” value sought, andx “ ” represents a data point for a single measurement), explain in terms of accuracy and precision (e. g. good vs. poor), the result of each measurement. ...
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