Lecture1_082608

Lecture1_082608 - Page 1 of 6 Lecture 1 Importance of Units...

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Unformatted text preview: Page 1 of 6 Lecture 1 - August 26, 2008 Importance of Units: Numbers without units are like people without names. SI units will be used predominantly: Primary S.I. Units: Quantity Symbol Unit Symbol for Unit Length L meter m Mass m kilogram kg Time t second s Temperature T Kelvin K Electrical Current I Ampere A Secondary S.I. Units: Quantity Symbol Unit Symbol for Unit Volume V = L 3 m 3 Acceleration a = d 2 x/dt 2 m•s-2 Force F = m•a Newton 1 N = 1 kg•m•s-2 Work, Heat, Energy W = F• Δ x Joule 1 J = 1 N•m Power P = W/t Watt 1 W = 1 J•s-1 Pressure, Energy Density p = F/A Pascal 1 Pa = 1 N•m-2 = 1 J•m-3 Electrical Charge Q = I•t Coulomb 1 C = 1 A•s Electric Potential Δ V = E/Q Volt 1 V = 1 J•C-1 Electric Resistance R = Δ V/I Ohm 1 Ω = 1 V•A-1 Electric Capacitance C = Q/ Δ V Farad 1 F = 1 C•V-1 Other commonly used units you need to know are: Length: Angstrom, Å = 10-10 m and Micron, μ = 10-6 m Volume: Liter, L = 10-3 m 3 and Milliliter, mL = 1 cm 3 Force: Dyne, dyn = 10-5 N Pressure: Bar, bar = 10 5 Pa Atmosphere, atm = 101325 Pa Torr, Torr = 133.222 Pa Millimeters of Mercury, mmHg = 1 Torr = 133.222 Pa Energy: Erg, erg = 10-7 J and Calorie, cal = 4.184 J Temperature: Degrees Celsius, °C = K - 273.15 Page 2 of 6 SI Prefixes (Inside front cover of text): Prefix Symbol Multiplier deci d 10-1 centi c 10-2 milli m 10-3 micro μ 10-6 nano n 10-9 pico p 10-12 femto f 10-15 atto a 10-18 deka D 10 kilo k 10 3 mega M 10 6 giga G 10 9 tera T 10 12 Concepts 1) Atomic and Molar Masses in Nuclide Notation: z = atomic number N = number of neutrons Mass #, A = z + N Q A z , examples are different isotopes of carbon and hydrogen C 12 6 , C 13 6 , C 14 6 and H 1 1 , H 2 1 , H 3 1 2) Atomic Mass Units = u = exactly 1/12 the mass of one atom of C 12 6 = 1.66 x 10-27 kg Multiplication by Avogadro's Number (N A = 6.02214 x 10 23 ) gives a molar mass of 10-3 kg 3) Relative Atomic Masses, Ar, are defined as Ar = m/u. 3) Relative Atomic Masses, Ar, are defined as Ar = m/u....
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This note was uploaded on 09/29/2008 for the course CHEM 3615 taught by Professor Aresker during the Fall '07 term at Virginia Tech.

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Lecture1_082608 - Page 1 of 6 Lecture 1 Importance of Units...

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