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Unformatted text preview: November 2, 2007 Dr. Stevens Gen. Chem. 1 Bohrs Model:-theory: 1. electrons have only specific quantized E values 2. light is emitted as electrons move from upper E levels to lower E levels-E(n) = -R(h) x (1/h^2)-n = shell #-R(h) = rydberg constant (for H) = 2.18x10^-18J-change in E = E(final)-E(initial)-emission change in E < 0-ex: n=3 n=2-absorption change in E > 0-ex: n=3 n=4-calc. wavelength of light emitted if an electron in H moves from n=5 n=3.-change in E = E(3)-E(5)-E(3) = -2.18x10^-18x1/9 = -2.42x10^-19-E(5) = -2.18x10^-18x1/25 = -8.72x10-20-2.42x10^-19 -8.72x10-20 = -1.55x10^-19-wavelength = hc/E = 6.626x10^-34(2.9979x10^8)/-1.55x10^-19 = 1.28x10^-6m-infrared Quantization:-for light/energy-1 unit/1 quantum = 1 photon-why? b/c of waves and circular orbitals-circular wave-same multiples as linear waves-linear wave-sound waves/etc-only multiples of wavelength can fit on the string-dual nature electrons and light-both particles and waves-mass...
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