Chem 141 Chapter 7

Chem 141 Chapter 7 - 7-1Chemistry 141Summer 2008Silberberg...

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Unformatted text preview: 7-1Chemistry 141Summer 2008Silberberg Chapter 7Dr. Ben Tovrog7-2Silberberg Chapter 7 Problem AssignmentThese problems are for your practice. They will not be collected or graded. Easy and Medium:7.2, 7.7, 7.9, 7.11, 7.13, 7.16, 7.20, 7.23, 7.25, 7.31, 7.34, 7.37, 7.41, 7.47, 7.48, 7.49, 7.51, 7.55, 7.57, 7.59, 7.66, 7.74.Hard7.69, 7.71, 7.81, 7.977-3Quantum Theory and Atomic Structure7.1 The Nature of Light7.2Atomic Spectra7.3 The Wave-Particle Duality of Matter and Energy7.4The Quantum-Mechanical Model of the Atom7-4Figure 7.1Frequency and Wavelengthc = The Wave Nature The Wave Nature ofofLightLight7-5Figure 7.2Amplitude (intensity) of a wave.7-6Figure 7.3Regions of the electromagnetic spectrum.7-7Sample Problem 7.1SOLUTION:PLAN:Interconverting Wavelength and Frequencywavelength in units givenwavelength in mfrequency (s-1or Hz)= c/Use c = 10-2 m1 cm10-9 m1 nm= 1.00x10-10 m= 325x10-2 m= 473x10-9 m=3x108 m/s1.00x10-10 m= 3x1018 s-1==3x108 m/s325x10-2 m= 9.23x107 s-13x108 m/s473x10-9 m= 6.34x1014 s-1PROBLEM:A dental hygienist uses x-rays (= 1.00A) to take a series of dental radiographs while the patient listens to a radio station (= 325 cm) and looks out the window at the blue sky (= 473 nm). What is the frequency (in s-1) of the electromagnetic radiation from each source? (Assume that the radiation travels at the speed of light, 3.00x108 m/s.)o1 A = 10-10 m1 cm = 10-2 m1 nm = 10-9 mo325 cm473nm1.00Ao10-10 m1Ao7-8Wavelength, Frequency, Energy1. An FM station broadcasts classical music at 93.5 MHz (megahertz). Find the wavelength (in m, nm, and A) for this frequency. 2. Rank the following photons in terms of decreasing energy a) IR (v = 6.5 x 10 13s -1), b) microwave (v = 6.5 x 10 11s -1), c) UV (v = 8.0 x 10 15s -1)3. Covalent bonds in a molecule absorb radiation in the IR region and vibrate at characteristic frequencies. a) The C-O bond in an organic compound absorbs radiation of wavelength 9.6 m. What is the corresponding frequency? b) The H-Cl bond has a frequency of vibration of 8.652 x 10 13Hz. What is the corresponding wavelength. 7-9Figure 7.4Different behaviors of waves and particles.7-10Figure 7.5The diffraction pattern caused by light passing through two adjacent slits.7-11Plank And Einstein Quantum Theory and PhotonsWhile radiation has wave properties and appears to continuously vary over the visible spectrum, Plank determined that energy is emitted in only discrete levels, i.e....
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Chem 141 Chapter 7 - 7-1Chemistry 141Summer 2008Silberberg...

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