Chem 161-2010 Lecture 14

Chem 161-2010 Lecture 14 - CHEMISTRY 161-2010 LECTURE 14...

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CHEMISTRY 161-2010 LECTURE 14 ANNOUNCEMENTS E-MAIL ATTENDANCE EXAMS Chem 161-2010 Lecture 14 1
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PLAN FOR TODAY : H&P Sections 7.8 – 7.9 WAVE MECHANICS: MATTER AS WAVES • DE BROGLIE’S EQUATION • WAVE FUNCTIONS QUANTUM NUMBERS AND ATOMIC ORBITALS • QUANTUM NUMBERS • ELECTRON PROBABILITIES AND THE SHAPES OF ORBITALS • ELECTRON SPIN: A FOURTH QUANTUM NO. Chem 161-2010 Lecture 14 2
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CHAPTER 7 LIGHT AND MATTER ET: Describe light wave as electromagnetic radiation with a magnetic field, an electric field, and having a speed of 3 x 10 8 m/s. Draw undulating light curve to define λ, υ and amplitude. Relate light to graph on next page. ET: Discuss 3 equations from formula page and show that knowing one parameter gives the other two Wavelength = λ = distance/cycle = distance Frequency = υ = cycles/s = cycles s -1 = s -1 = Hz Amplitude = intensity, brightness, related to no. of photons emitted E photon = h υ ET: Use water waves to show relationship between high frequency and high energy; also use graph on next page. υ = c/λ E = hc/λ h = 6.626 x 10 -34 Js = 6.626 x 10 -34 kgm 2 s -2 s = 6.626 x 10 -34 kgm 2 s -1 c = 3 x 10 8 m/s DeBroglie theorem: λ= h/mv ET: Wave-particle duality; tie into E = hυ m is the mass in kg v = velocity in meters per second Bohr atom: ΔE = -B((1/n f 2 ) - (1/n i 2 )) B = 2.179 x 10 -18 J Einstein’s photoelectric effect Total Energy = Energy threshold* + Energy kinetic Energy total = h υ threshold + h υ kinetic energy Chem 161-2010 Lecture 14 3
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DIFFRACTION INTERFERENCE PATTERNS OF LIGHT WAVES CONSTRUCTIVE Chem 161-2010 Lecture 14 4 DESTRUCTIVE
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Chem 161-2010 Lecture 14 5 Should be white light with a mixture of frequencies
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WAVE-PARTICLE DUALITY Light sometimes acts as a wave. Refraction is characteristic of a wave. Diffraction is characteristic of a wave. Light sometimes acts as a particle. Behaving as a baseball in the photoelectric effect. Chem 161-2010 Lecture 14 6
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Similar to: CHEM 161-2004 FINAL EXAM + ANSWERS, prob 10 CHAPTER 7 - LIGHT, ATOMIC STRUCTURE & PERIODIC TABLE TRENDS DeBroglie – wave/particle duality ET: Light acts as a wave in that it refracts (e.g., through a prism), and diffracts (e.g., through a crystal, as in x-ray crystallography). When x-rays are sent into a crystal, they are scattered by the atoms of the crystal. The x-rays scattered from each atom in the crystal interfere or reinforce one another to give a characteristic x-ray diffraction pattern. ET: Light also acts as a particle (Photoelectric effect, in which light previously was shown to move an electron to a higher energy level, but now was shown to bang an electron out of the atom. ET: DeBroglie said, if waves act like particles, then perhaps particles act like waves. Wave-particle duality DeBroglie theorem: λ= h/mv ET: Discuss E=mc2 to show the interconversion of mass and energy; also discuss a high energy particle in a cyclotron being converted into mass.
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This document was uploaded on 11/02/2011 for the course GEN CHEM 162 at Rutgers.

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Chem 161-2010 Lecture 14 - CHEMISTRY 161-2010 LECTURE 14...

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