Blake Lecture 10-3-08

Blake Lecture 10-3-08 - Solution ( 10 Years) Bohr Assumed...

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Blake 10-3-08 Chemistry Topics 1. The electromagnetic spectrum 2. Line Spectra 3. Bohr Energy levels for H + Electrons 4. Schrödinger Quantum Numbers Orbitals Ex 1: Which Type of electromagnetic radiation is of the highest energy per photon? 1. Microwave 2. Blue light 3. Infrared radiation - ANSWER 4. Radio waves Electromagnetic Spectrum Photons are energy carriers 1. Light energy 2. Invisible electromagnetic radiation Two equations, three variables 1. Spectrum (Radio waves, Microwaves, infrared, ROYGBIV, UV, X-ray, Gamma)(Longest to shortest) 2. Emissions (Alpha ( δ ) – He 2+ , Beta ( β ) – e - , Gamma ( α ) – energy) 3. E = energy ν = n4 = frequency λ = wavelength h = 6.626 x 10 -34 J/g 4. E = h ν c (speed of light) = νλ 5. C = 3.0 x 10 8 m/s Ex 2: λ = 2.3 Angstroms 1 Angstroms = 1 x 10 -10 m. c = λν v = (3.0 x 10 8 m/s / 2.3 x 10 -10 m) = 1.3 x 10 18 s -1 = 1.3 x 10 18 Hz E = h ν (6.6 x 10 -34 J/s)(1.3 x 10 18 1/s) = 8.6 x 10 -16 J Mystery
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What would cause only 4 specific visible colors to be emitted?
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Unformatted text preview: Solution ( 10 Years) Bohr Assumed 1. Energy emission came from a change in E in the atom ( E = E f E i ) 2. Electron distance from nucleus was variable Energy is associated with distance kq 1 q 2 /r = E coulombs 3. Electron energy was variable, but could only have certain values (quantized) 4. E is lower the more negative close the electron and the proton are Bohrs Equation E n = -2.18 x 10-18 (J/n 2 ) N is just a counting number to tell us which energy level we are considering N = 1 means the first energy level E 1 = (-2.18 x 10-18 J / (1) 2 ) = -2.18 x 10-18 J Graph of Energy levels Calculate n for the first 5-6 energy levels E 4 = (-2.18 x 10-18 J / (4 2 )) E 5 = (-2.18 X 10-18 J/ (5 2 )) Light Emission is when you go to High Energy Low Energy...
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This note was uploaded on 03/22/2011 for the course CHEMISTRY 1307 taught by Professor Tamarahanna during the Spring '09 term at Texas Tech.

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Blake Lecture 10-3-08 - Solution ( 10 Years) Bohr Assumed...

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