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CH7(4-5)Oct24FA08a - CHEM 109 General Chemistry University...

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CHEM 109 General Chemistry University of Nebraska Fall 2008 Friday, October 24, 2008 ANNOUNCEMENTS: MasteringChemsitry is now ON !!
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ΔE = E final – E initial ΔE = -2.179 x 10-18 J [(1/n2 final ) – (1/n2 inital )]
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Energy 1 2 3 4 n If an electron in the n = 1 level of an H atom absorbs enough energy to move to the n = 4 level. How much energy is absorbed? If an electron in the n = 4 level of an H moves to the n = 2 level. How much energy is emitted? Light of what wavelength is emitted in a transition from n = 4 to n = 2?
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Two important concepts from Bohr: Electrons exist only in certain discrete _______________- Energy is involved in moving an electron from one level to another The lowest energy state of an electron is its ______________- . When electrons are excited to higher states, they are said to be in an _______________- . AND IN REALITY, ELECTRONS DO NOT _____ THE NUCLEUS LIKE PLANETS ORBITING A STAR!!!! Bohr’s Model Problem: Bohr’s model only works for ________
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Visible region (Balmer) UV (Lyman) IR (Paschen) For hydrogen, the energy of an electron in the n th orbit is calculated using this equation. Don’t be confused by the negative sign for the energy values.
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