lecture2 (10-2-2006) Ch 2

lecture2 (10-2-2006) Ch 2 - Chemistry 2A-c F2006 (Ch-4)...

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Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch (Ch -4) 4) N/m 2 Uncertainties in measurements
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Chemistry 2A Chemistry 2A -c F2006 c F2006 (Ch (Ch -5) 5) The result of multiplication or division may contain only as many significant figures as the least precisely known quantity. Example: (14.79 cm) x (12.11 cm) x (5.05 cm) = 904 cm For addition or subtraction : 15.02 g 9986.0 g 3.518 g 10,004.5 38 g Drop last two digits: 38 + Rounding off numerical results: Example: Round off 15.453 to 3 significant figures: 15.5 Round off 14.54 to 3 significant figures: 14.5
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Chemistry 2A Chemistry 2A -c F2006 (Ch2 c F2006 (Ch2 -1) 1) Atoms and Atomic Theory Atoms and Atomic Theory I. Early experimental observations: Conservation of mass : total mass of reactants = total mass of products e.g. 2H 2 + O 2 2H 2 O Law of constant proportion : A compound have the definite proportions by mass of the constituent elements: e.g. H 2 O Dalton’s Atomic Model: 1. Each chemical element is composed of indestructible minute
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This note was uploaded on 04/23/2008 for the course CHEM 2A taught by Professor Guo during the Fall '08 term at UC Davis.

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lecture2 (10-2-2006) Ch 2 - Chemistry 2A-c F2006 (Ch-4)...

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