chem 123 measurment notes - Chapter 2 Measurement 2.1...

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Unformatted text preview: Chapter 2: Measurement 2.1 Significant Figures A. Accuracy and Precision 1) Accuracy: how close a measured value is to the 043m} V QM g . . 2) Precision: how close measured values are to coca Cs‘l‘nct B. Measured numbers - There will be some-item . in where to round off a measured quantity based upon the precision of the measuring instrument. - The level of uncertainty is reported by usingg a} flat-.3 a. 58 my; (35:) - Thermse Significant Figures reported, the m M. Cat-Mm the measurement. C. Significant Figures (SF) 1) A number is Significant if it is: a) 06% 0\ Lao 65.2 9 255.245. 9 3—3"? L? ‘5‘ b) 9 Lao Winn i. ate TEX-“3 29.05 1.0087 4st ‘TF; 9-,? C) ‘fi 21.13% (7-233 233.- "1 ,-\. _‘i‘ id'i fi‘u‘ffiifif . stir/Cw ) 3.7500 620 “ ”5' 7* '5 :‘E .r 5: 2) A number is NOT Significant if it is: a)“: x): 1.3 5. -.= .. .. «2-;- ;i‘.-" , - 1,. 0.000234 0.520 33 S? 3?. C I" b) 9“ 1“” 5‘3"“ The or r _»-E ‘t ‘1 ' i ., 140 3000 K; ;_ 3;? Rounding Off Using Standard Rounding Rules Example: Write 145234 with only _2_ SF "in V-i Write 135500.0 with only 3_SF \M‘l‘ 30 1893050 E. Calculations with Significant Figures (SF) - the level of “am-38min, must be unammmegl in the answer. 1) Multiplying and Dividing- the Rang numbex 6%: g: One $93:ch 75.642 x 2.03 = \__%_’—t%§w 0.33 + o.—111 — o? 433141402313 La) (5) - —- 2) Adding and Subtracting — Ami 9cm es,‘ “\Wmoer OK‘ Ckfimal QVXL'CS CWYC QrCSGNGOL 2.003 + 1 = 30mg) (38.3) map) —_ E 16.88821 - 4.23 = 'l&-Lag3..2\ L5 8-91) L02) :- 3) Multistep- {AWN cam 33m Am SQWC 3m: V‘OORM Name) “AWE cl?) \|(JV\ <50 ‘(3.4x2.2.2)+01= ' OLE‘PB i?! 21.8 ...
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