Blake Lecture 10-6-08

Blake Lecture 10-6-08 - Blake 10-6-08 Chemistry Topics Bohr...

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Chemistry Topics Bohr 1. Energy levels of H electrons Schrödinger 1. Quantum Numbers 2. Orbitals Ex 1: Which type of electromagnetic radiation is of the longest wavelength per photon? 1. Microwave 2. Blue Light 3. Infrared Radiation 4. Radio Waves – ANSWER Graph of Energy Levels Calculate n for first 5-6 energy levels N = 1 = -2.18 x 10 -18 J N = infinity -2.18 x 10 -18 J/n 2 = E n Electronic Transitions What is the energy change for an electron going from the n=1 to the n=3 level? 1. Gain in energy for atom 2. Delta E = + absorb photon What is the frequency of the absorbed photon 1. Delta E = E f -E i = E 3 – E 1 2. (-2.18 x 10 -18 J/ (3 2 )) – ((-2.18 x 10 -18 J / (1 2 )) = 1.94 X 10 -18 J 3. A photon is absorbed by atom has E 4. V = E/h (1.94 x 10 -18 J)/ (6.626 x 10 -24 J/s) = 2.92 x 10 -15 second Ex 2: Which transition involves the emission (higher energy level to lower energy level) of the greatest energy? 1.
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Blake Lecture 10-6-08 - Blake 10-6-08 Chemistry Topics Bohr...

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