Lecture #1 - Chemistry 2A-c W2009 c W2009 (Ch1 (Ch1-5) 5)...

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Chemistry 2A Chemistry 2A -c W2009 c W2009 (Ch1 (Ch1 -1) 1) Chemical energy
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Chemistry 2A Chemistry 2A -c W2009 c W2009 (Ch1 (Ch1 -2) 2) Uniform Non-uniform Can be separated by physical processes (>2 substances) Cannot be separated by chemical processes Can be decomposed into elements chemically Atoms
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Chemistry 2A Chemistry 2A -c W2009 c W2009 (Ch1 (Ch1 -3) 3) Scientific methods Physical Laws Experimental observations Theories or models m
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Chemistry 2A Chemistry 2A -c W2009 c W2009 (Ch1 (Ch1 -4) 4) N/m 2 Uncertainties in measurements
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Chemistry 2A
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Unformatted text preview: Chemistry 2A-c W2009 c W2009 (Ch1 (Ch1-5) 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 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 Drop last two digits: 38 +...
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Lecture #1 - Chemistry 2A-c W2009 c W2009 (Ch1 (Ch1-5) 5)...

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