lect4_4Sept08

lect4_4Sept08 - Unfortunately, Gloria eventually had to...

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Unfortunately, Gloria eventually had to leave the University because of her tendency to hibernate through lectures.
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But It is 9.87 x 10 17 MILES Away ! C = Speed of light = 2.9979 x 10 8 meters/second = Time = 9.87 x 10 17 MILES / ( 2.9979 x 10 8 meters/sec x 1 mile /1609 meters) = 5.30 x 10 12 seconds = 1.68 x 10 4 years ______________ We saw it explode only when the light from the explosion reached earth.
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1 mole of molecules weighs 1 gram molecular weight
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Relationship Between Mole Unit and Atoms and Molecules Elements 1 mol Ar = 6.023 X 10 23 atoms Ar Molecular Compound – 1 mol H 2 O = 6.023 X 10 23 molecules H 2 O Ionic Compounds – 1 mol NaCl = 6.023 X 10 23 formula units of NaCl
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WHY NOT Ounce atomic weight ? Pound atomic weight ? Ton atomic weight ? etc. Example: 1 pound atomic weight of C weighs 12.01 pounds It contains (12.01 lb X 453.6 gm/lb) / [(1.6606 x 10 -24 gm/amu)x(12.01 amu/atom)] = 2.73 x 10 26 atoms ____________ ‘S NUMBER YOUR NAME HERE
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Representing Molecules • Names: ethanol, ethyl alcohol • Formulas C 2 H 6 O, C 2 H 5 OH, CH 3 CH 2 OH • Structural drawings • Models
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Line Drawings • Shorthand notation • Carbons & hydrogens on carbons not shown • Each line is a bond • Each carbon has 4 bonds C C O H H H H H H OH
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ethanol C 2 H 6 O CH 3 CH 2 OH dimethyl ether C 2 H 6 O CH 3 OCH 3 Ways to depict molecules
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lect4_4Sept08 - Unfortunately, Gloria eventually had to...

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