WA08_CHE-121-mar14 - Thomas Edison State College General Chemistry I with Labs(CHE-121 Section no OL009 Semester and year May Term Written Assignment 8

WA08_CHE-121-mar14 - Thomas Edison State College General...

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Thomas Edison State CollegeGeneral Chemistry I with Labs (CHE-121)Section no.: OL009Semester and year: May TermWritten Assignment 8: The Electronic Structure of AtomsAnswer all assigned questions and problems, and show all work. 1.The blue color of the sky results from the scattering of sunlight by air molecules. The blue light has a frequency of about 7.5 × 1014Hz.(a) Calculate the wavelength, in nm, associated with this radiation, and (b) calculate the energy, in joules, of a single photon associated with this frequency. (8 points)(a) 2.998 x 108/ 7.5 x 1014x 1 nm / 10-9= 4.0 x 102 nm(b) 6.626 x 10-34x 7.5 x 1014= 5.0 x 10-19J(Reference: Chang 7.16)2. (a) What is an energy level? Explain the difference between ground state and excited state. (b) What are emission spectra: How do line spectra differ from continuous spectra? (6 points)(a) An energy level is a specific area that electrons orbit near the nucleus. Ground andexcited states are the extremes, which are the lowest and highest energy levels respectively.(b) Emission spectra are spectra of radiation. Line spectra differ from continuous spectra in that in that they emit only at particular wavelengths while continuous spectra cover all wavelengths.(Reference: Chang 7.23)3.Explain the statement , Matter and radiation have “dual nature.” (3 points)The statement that matter and radiation have a dual nature is explained in that matter presents as both waves and particles. The more defined one aspect is the less defined the other becomes.(Reference: Chang 7.35)1Copyright © 2014 by Thomas Edison State College. All rights reserved.
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4.Which of the four quantum numbers (n, ℓ, m, ms) determine (a) the energy of an electron in a hydrogen atom and in a many-electron atom, (b) the size of an orbital, (c) the shape of an orbital, (d) the orientation of an orbital in space. (4 points)(a) ms. (b) n.(c) ℓ. (d)mℓ.
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