Ch_1-2_Experimental_Uncertainties

Ch_1-2_Experimental_Uncertainties - 3 mass min = 39.7 - 0.2...

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PRECISION AND ACCURACY Neither accurate nor precise Accurate and precise Precise, but not accurate Zumdahl
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UNCERTAINTIES IN MEASUREMENT meniscus Zumdahl 22. 16 ± 0.02 mL
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Example 1. The volume of a liquid is 48.3 ±0.4 cm 3 . Its mass is 39.7 ±0.2 g. What is the density of the liquid? (Hint, find the maximum and the minimum possible density of the liquid. Using these obtain the average density and its range.) WORST-CASE METHOD FOR ESTIMATING EXPERIMENTAL UNCERTAINTY ( OR MAXIMUM-MINIMUM METHOD ) V min = 48.3 - 0.4 =47.9 cm 3 V max = 48.3 + 0.4 =48.7 cm
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Unformatted text preview: 3 mass min = 39.7 - 0.2 =39.5 g mass max = 39.7 + 0.2 =39.9 g min density = 3 max 3 min 39.9 0.833 / 47.9 mass g g cm V cm = = 3 min 3 max 39.5 0.811 / 48.7 mass g g cm V cm = = max = density 3 min max 0.811 0.833 0.822 / 2 2 density density density g cm + + = = = 3 max min 0.833 0.811 0.011 / 2 2 density density range g cm--= = = 3 .822 0.011 / ensity density range g cm = 0.822 0.011 / density = Note, 0.822 + 0.011 = 0.833 or max. and 0.822 0.011 = 0.811 or min....
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This note was uploaded on 11/23/2010 for the course CHEM CHEM125 taught by Professor Ellis during the Fall '10 term at NJIT.

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Ch_1-2_Experimental_Uncertainties - 3 mass min = 39.7 - 0.2...

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