chem notes 9-10 - September 10, 2007 Dr. Stevens Gen. Chem....

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September 10, 2007 Dr. Stevens Gen. Chem. 1 WebAssign due Friday Chapter 1 Objectives: 1. Know and identify forms and states of matter 2. Know SI units of measurement 3. Use scientific notation to represent numbers 4. Write numbers with significant figures 5. Use factor-label method to solve problems. SI Base Units: Quantity Name of unit Symbol Length Meter M Mass Kilogram kg Time Second S Temperature Kelvin K Amount of substance Mole Mol Prefixes: Nano (n) = 10^-9 1m=1m 1_m=1_m 1(n)m=1(x10^-9)m Giga (G) = 10^9 1s=1s 1_s=1_s 1(G)s=1(x10^9)s Scientific Notation: -shorthand for representing very large/small numbers -base 10 scale (10^x) N x 10^n -N = mantissa -n = characteristic Mantissa: -number b/w 1 and 10 -tells us significant figures Characteristic: -basis of logarithm (power of 10) - (+/-) integer Example: 1. 568.762 = 5.68762 x 10^2
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2. 0.073 = 7.3 x 10^-2 Significant Figures: Any non-zero digit is significant 1.34 = 3 sig figs Zeros b/w sig figs are significant 402 = 3 sig figs Zeros on the left of a sig fig are NOT significant
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This note was uploaded on 04/23/2008 for the course CH 151 taught by Professor Stevens during the Fall '08 term at Whitworth University.

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chem notes 9-10 - September 10, 2007 Dr. Stevens Gen. Chem....

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