Important_Equations_and_Key_Study_Points_8&9

# Important_Equations_ - Important Equations from Chapter 8 9 that you should know Note Fundamental constants and a periodic table will be provided

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1 Important Equations from Important Equations from Chemistry 110 Fall 2008 Note : Fundamental constants and a periodic table will be provided on the midterm but equations will not be given. SI Units SI Units Secondary Units written in terms of Primary

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2 SI Units SI Units Common SI Prefixes Chemical Symbols Chemical Symbols One or Two Letter Abbreviations Carbon: C Oxygen: O Nickel: Ni Gold: Au ± E A Z E = Chemical Symbol Z = Atomic No. = p A = Mass Number = p + n ± = Charge = p - e
3 Quantum Theory Quantum Theory Rayleigh-Jeans Law for Blackbody () e Temperatur Absolute T Constant s Boltzmann' k Density Energy kT 8 4 = = = = ρ λ π You do not have to know this equation for calculations but you should know that the classical theory predicts an inverse relationship between Energy Density and Wavelength i.e. ρ proportional to λ 4 Ultraviolet catastrophe…energy density goes to infinity as wavelength gets smaller…A failure of the classical theory Some Important Equations Some Important Equations νλ c = light of speed c Js 10 x 6.626 h Constant s Planck' h h ν E 34 - = = = = νλ u = EM Radiation Any wave u = wave velocity ν = frequency λ = wavelength

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4 Some Important Equations Some Important Equations u m KE 2 e 2 1 electron = - e the removing for eshold energy thr the metal for the function" work " = Φ electron the of mass m e = electron the of velocity u = Φ = = - h ν h ν - h ν KE o electron Photoelectric Effect ν = Frequency of the light that is directed on the metal surface ν ο = Threshold frequency for the metal Some Important Equations Some Important Equations λ c h E h ν E = = Energy of a Photon Radius Bohr the pm 52.9 a where a n r o o 2 n = = 2 -18 2 H n n J 2.179x10 - n hcR - E = = Radius and Energy of n th Bohr Orbit
5 Some Important Equations Some Important Equations n 1 - n 1 hcR E 2 f 2 i H = Δ Energy for change of discrete orbits from n i to n f Δ E<0 for emission Δ E>0 for absorption λ c h h ν E = = Δ Energy for photon emitted or absorbed for discrete transition between orbits Note that this energy is simply the absolute value (i.e. positive) of the energy change shown above for the transition between orbits E E orbits between n transitio e photon - Δ = Δ Energy of a photon Energy change for transition between orbits Some Important Equations Some Important Equations Z a n r n 1 - n 1 hcR Z E pm 52.9 a Number Atomic Z n

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## This note was uploaded on 12/25/2011 for the course CHEM 110 taught by Professor Fenster during the Fall '07 term at McGill.

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Important_Equations_ - Important Equations from Chapter 8 9 that you should know Note Fundamental constants and a periodic table will be provided

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