Chem 161-2010 Lecture 14-2

Chem 161-2010 Lecture 14-2 - CHEMISTRY 161-2010 LECTURE 14...

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Chem 161-2010 Lecture 14 1 CHEMISTRY 161-2010 LECTURE 14 ANNOUNCEMENTS E-MAIL ATTENDANCE EXAMS
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Chem 161-2010 Lecture 14 2 45 50 55 60 65 75 1 2 3 4 5 6 7 8 9121314151617181920212223242526272829303132333435363740415051525354 CHEM 161-2010 GRADES IN 2 nd HOURLY EXAM ALL SECTIONS Douglass/Cook Rutgers/Pharm Avg of Tavss’ sections Avg of D/C sections Avg of Rutgers/Pharm sections: GRADES SECTIONS College Ave.
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Chem 161-2010 Lecture 14 3 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.
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Chem 161-2010 Lecture 14 4 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 = h υ m is the mass in kg v = velocity in meters per second Bohr atom: Δ E = -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
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Chem 161-2010 Lecture 14 5 DIFFRACTION INTERFERENCE PATTERNS OF LIGHT WAVES CONSTRUCTIVE DESTRUCTIVE
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Chem 161-2010 Lecture 14 6 Should be white light with a mixture of frequencies
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Chem 161-2010 Lecture 14 7 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.
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Chem 161-2010 Lecture 14 8 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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Chem 161-2010 Lecture 14-2 - CHEMISTRY 161-2010 LECTURE 14...

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