Chem 201 - 8.27.07

Chem 201 - 8.27.07 - 2 , CO & CO 2 ) Structure...

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Chem 201 – August 27, 2007 Lecture 2: Fundamental SI Units: Kg, m, K, mol, s, A, cd SI prefixes: P 10 15 T G M k h da d c m μ p f 10 -15 Measurements – 1.01_dL -1 for units -1 sig. figs. Conversions Original x conversion factor = different units 629 in 2 = __.406__ m 2 39.37 in = 1 m 629 in 2 x (1m/39.37in) 2 = .406 m 2 Robert Boyle – described elements as a substance that could not be broken down any further Law of Mass Conservation – Matter cannot be created nor destroyed Law of Definite Proportions – Pure substances of the same thing always contain the same proportion (eg. H 2 O, O 2 , CH 4 ) Example reaction: CH 4 + 2O 2 CO 2 + 2H 2 O Law of Multiple Proportions – elements can combine in different ways to form
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Unformatted text preview: 2 , CO & CO 2 ) Structure of Atoms shaped like sphere, nucleus, electrons, protons, neutrons Isotopes elements can have a different mass but have the same chemical properties Mass number number of protons and neutrons (upper left) Atomic Number weighted average of isotopes (M 1 A 1 + M 2 A 2 ) 6 Li 6.0151 amu 7.52% 7 Li 7.0160 amu 92.48% Compound elements that combine to form a substance with different properties described by chemical equation\ Mixture two substances that are not mixed together Heterogeneous not uniform, bucket of legos, beef stew Homogenous uniform, salt and water, sugar and water...
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This note was uploaded on 04/07/2008 for the course CHEM 201 taught by Professor Harris during the Fall '07 term at Bucknell.

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Chem 201 - 8.27.07 - 2 , CO & CO 2 ) Structure...

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