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CHEM 111 (69)

Revised model of the atom, the photon, calculating photons, atomic spectra, hydrogen spectrum, Bohr model of the atom,

4 Pages

Course Code
CHEM 111
Dana Johnson

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10 September Announcements Chapter 7 problems: 2, 7, 9, 11, 13, 16, 20, 22, 23, 29, 31 ALEKS quizzes??? Exam next Wednesday (8/15) 7 – 9 pm Rooms TBA but all in Clark Through 7.2 Recitations next week Tuesday – exam review, open to everyone Thursday – go over the exam you will take on Wednesday Revised model of the atom Use the form on RamCT Explain your concept of the atom With words and pictures (do not cut and paste) Talk about how it has changed from your initial model Give reasons why things have changed Where did new ideas come from? If it hasn’t, talk about what is the same Make a copy to study for the exam Due the beginning of class Monday 9/13 or before The photon Einstein’s light ‘particle’ Bundles of electromagnetic energy Connected to Planck’s quantum number E = nhν “n” is not just a positive integer, but the number of photons being absorbed by the atom When n = 1, the equation calculates the energy of 1 photon N = 2, energy of 2 photons Planck’s formula can also be used to solve for the number of photons absorbed by an atom Calculating photons If an atom absorbs 2.5 x 10 -16J of energy when light with a frequency of 1.51 x 10 Hz is 15 shone on it, how many photons were absorbed? E = nhν → n = E / hν -16 -34 15 -1 N = 2.5 x 10 J / (6.626 x 10 J*s x 1.51 x 10 s ) N = 2.5 x 10 -1J / 1.00 x 10 -1J N = 249.9 → 250 (to 2 sig figs and a whole number) The atom absorbed 250 photons of energy Atomic spectra Another key to understanding electrons in an atom Line spectra – produced when an element is vaporized and energized, the light produced is spread via a prism Hydrogen spectrum Line spectrum of hydrogen showed distinct s
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