Exam 2 study guide 2.2

# Exam 2 study guide 2.2 - Chapter 6 Know definition of...

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Chapter 6: Know definition of wavelength, frequency, and amplitude of electromagnetic radiation. \ Know that EM radiation traveles at the velocity of light (c= 3.00 10 8 m/s) and that c =  . Know that Einstein stated that energy is proportional to frequency ( ): E = h , where h is Planck’s constant: 6.63 10 _34 J-s. If the wavelength ( ) of light is known, then the energy in one photon (packet of that light) can be calculated: E = h • c / . Know difference between continuous and line spectra. Know Niels Bohr’s proposition: Electrons in permitted orbits have specific, “allowed” energies; these energies will not be radiated from the atom. Energy is only absorbed or emitted in such a way as to move an electron from one “allowed” energy state to anoth er; the energy is defined by E = h . Where the frequency ( ) is of “light” emitted or absorbed. The energy absorbed or emitted from the process of electron promotion or demotion can be calculated by the equation: E = - R H ((1/n f 2 )-1/(1/n i 2 )), where R H is the Rydberg constant, 2.18 10 _18 J, and n i and n f are the initial and final energy levels of the electron. Know that de Broglie proposed that if light can have material properties, matter should exhibit wave properties.The relationship between mass and wavelength is: = h/(m •v). Know Heisenberg’s Uncertainty Principle which demonstrates that the more precisely the momentum of a particle is known, the less precisely is its position known. In many cases, the uncertainty of the whereabouts of an electron is greater than the size of the atom itself! The uncertainty is given as: ( x ) ( mv ) (h/4 ). The wave equation is designated with a lower case Greek psi ( ). The square of the wave equation, 2 , gives a probability density which is the statistical likelihood of the position of an electron at any given instant in time. Solving the wave equation gives a set of wave functions, or orbitals and their corresponding energies. Each orbital describes a spatial distribution of electron

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## This note was uploaded on 11/07/2009 for the course CHM 114 taught by Professor Aksyonov during the Spring '08 term at ASU.

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Exam 2 study guide 2.2 - Chapter 6 Know definition of...

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