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Chemistry Ch 1

QuestionAnswer
What did Max Planck do? Developed the first quantum theory, proposed that energy is emitted from matter as electromagnetic radiation in discrete bundles called quanta.
What is the equation derived by Planck? E=hf, where h is planck's constant 6.626 x 10^-34 Js, f is the frequency of radiation.
What are Bohr's assumptions about a hydrogen atom? That it is a central proton and an electron traveling in circular orbit, and that the centripetal force on the electron is the electrical force between the proton and electron.
How does Bohr use Planck's quantum theory to correct older assumptions about electrons? He placed restrictions on the value of the angular momentum of the electron revolving around the hydrogen nucleus. He predicted that the angular momentum of an electron is quantized according to L=nh/2π.
What is the electron energy equation derived by Bohr? E=-Rh/n^2 (rh is the Rydberg constant, 2.18x10^-18 J/electron).
Created by: schoe on 2011-05-31



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