{"id":2560,"date":"2013-01-29T12:22:17","date_gmt":"2013-01-29T12:22:17","guid":{"rendered":"http:\/\/www.sohag-univ.edu.eg\/facsci\/?p=2560"},"modified":"2013-01-29T12:22:17","modified_gmt":"2013-01-29T12:22:17","slug":"3rd-yearphysical-chemistry-electrochemistry-molecular-spectroscopyand-quantum-chemistry","status":"publish","type":"post","link":"https:\/\/sci.sohag-univ.edu.eg\/main\/3rd-yearphysical-chemistry-electrochemistry-molecular-spectroscopyand-quantum-chemistry\/","title":{"rendered":"3rd YearPhysical Chemistry (Electrochemistry, Molecular Spectroscopyand Quantum) Chemistry"},"content":{"rendered":"

2ed\u00a0Semester Examination June 2011<\/strong>
\nPhysical Chemistry (Electrochemistry, Molecular Spectroscopy<\/strong>
\nand Quantum Chemistry) Examination for the 3rd Year<\/strong>
\nChemistry Special<\/p>\n

Page 1 of 2
\n—————————————————————————————————-
\nAnswer Five Questions Only of the following:
\n1 a) If you have the cell representation: Cu,CuSO (0.01M) \/\/CuSO (0.1M),Cu 4 4
\ni) Refer to the type of the cell
\nii) Calculate the E.M.F. of the cell, knowing that:
\ne (Cu \/Cu) 0.34V 0 ++ = +
\n[21 marks]
\n[7 marks]
\n[14 marks]
\nb) Deduce the Nernst equation for the reaction: A B A B + z+ \u2194 z+ + [21 marks]
\n2 a) Discuss briefly the amalgam concentration cells referring to both cathodic and
\nanodic reactions and the net reaction.
\n[21 marks]
\nb) Consider the cell: Pb, Pb++ (a =1) \/\/ Ag+ (a =1), Ag
\nwhere 0
\nred e for Pb = -0.126 V and 0
\nred e for Ag = +0.799 V
\nWrite the cell reaction, then calculate the E.M.F. and \u0394G\u00b0 of the cell.
\n[21 marks]
\n3 a) If HCl35.5 molecule absorbs at 3000 cm-1. Deduce type of radiation and spectra if
\nintermolecular distance is 100 pm. Calculate the frequency of vibration.
\n[21 marks]
\nb) What is the expected type of the electronic spectra of the following compounds?
\nIn which region could be the spectra expected? Which one of them is colored and
\nwhy?
\n[21 marks]
\nCH CH CH CH = CHCOOH 3 2 2
\n4 a) Give reasons for:
\ni. Vibration spectrum consists of one line.
\nii. The energy of n\u2192\u03c3 * transition decreases as the following order: CH3Cl >
\nCH3OH > CH3NH2.
\niii. In Raman spectra molecules need not have dipole moment.
\niv. Quantum restrictions are not significant for transitional excitation.
\nv. The vibration spectrum is characteristic of molecule or a group within it.
\nvi. Rotational spectrum consists of equally spaced lines in microwave region.
\n[24 marks]
\n[4 marks]
\n[4 marks]
\n[4 marks]
\n[4 marks]
\n[4 marks]
\n[4 marks]
\nSohag University
\nDate: 15-06-2011
\nChemistry Dep.
\n2ed Semester Examination June 2011
\nPhysical Chemistry (Electrochemistry, Molecular Spectroscopy
\nand Quantum Chemistry) Examination for the 3rd Year
\nChemistry Special
\nFaculty of Science
\nTime: 3 hours
\nCode: 322 Ch
\nPage 2 of 2
\n4 b) Calculate the number of degrees of freedom for the different molecular thermal
\nmotions of NH3 and their energies in terms of KT at 25 \u00b0C
\n[18 marks]
\n5 a) Select All the correct answers (Justify your answer):
\ni. What is the eigenvalue of the momentum operator
\ndx
\nPx ih
\n\u2202
\n= \u2212
\n\u2227
\nwith
\neigenfunction ikx e ?
\nA. ik B. \u2212 ikh C. kh D. ikx E. ikx e
\nii. If the wave function \u03c8(x) satisfies the equation
\n3
\n2
\n( ) ( ) * \u03c0
\n\u222b \u03c8 \u03c8 = +\u221e
\n\u2212\u221e
\nx x dx , which of
\nthe following wave functions is normalized?
\nA. ( )
\n3
\n2
\n\u03c8 x
\n\u03c0
\nB. ( )
\n2
\n3
\n\u03c8 x
\n\u03c0
\nC.\u03c8 (x) D. ( )
\n3
\n2
\n\u03c8 x
\n\u03c0
\nE. ( )
\n2
\n3
\n\u03c8 x
\n\u03c0
\niii. What are the properties of stationary state wave function?
\nA. Finite B. Continous C. Single Valued D. Hermitian E. Re al Valued
\niv. An electron moves in a one-dimensional square well with size L, where the
\npotential energy is zero in the interior and infinite potential energy at the walls,
\nhas a ground state energy E0. If the size is decreases to L\/2 what is the new
\nground state energy?
\nA. Zero B. \/ 2 0 E C. \/ 4 0 E D. 0 E E. 0 4E
\nv. What does De Broglie relation state?
\nA.
\nmv
\nh
\nmc
\nh \u03bb = = B.
\nm
\nvh
\nm
\nch \u03bb = = C.
\nh
\nmv
\nh
\nmc \u03bb = = D. = (n+1)
\nc
\nh \u03bb E. ( +1)
\n\u03a1
\n= n
\nh \u03bb
\n[30 marks]
\n[6 marks]
\n[6 marks]
\n[6 marks]
\n[6 marks]
\n[6 marks]
\nb) For the particle in a ring in ground state, if the particle vector extending from \u03c6=0
\nto \u03c6=2\u03c0. What is the probability of finding the particle in half of the ring?
\n[12 marks]
\n6 a) Using secular determinant, calculate the energy of the \u03c0 molecular orbitals of allyl
\ncation ( 2 2 CH = C H = CH
\n+
\n). Sketch the molecular orbital diagram.
\n[20 marks]
\nb) If the C-C bond stabilization energy is -230 kJ\/mole, calculate the delocalization
\nenergy in 1,3-butadiene molecule relative to ethene molecule.
\n[22 marks]
\n—————————————————————————————————————-
\nPhysical Constants: NA = 6.022\u00d71023 mol-1, \u03c0 = 3.142, R = 8.3145 JK-1 mol-1, h = 6.626\u00d710-34 J.s amu =
\n1.66056 \u00d7 10-27 kg, F = 96500 coulomb, kB = 1.38066 \u00d7 10-23 J.K-1, me=
\n9.109\u00d710-31 kg.
\nWith all best wishes
\nc\u00dc\u00c9yA Yt\u00dc\u00c9\u00e2~ TA et\u00e1{\u00e3t\u00c7? c\u00dc\u00c9yA T\u00c4| `A f{t~x\u00dc? W\u00dcA `\u00c9{t\u00c5xw \\\u00e1\u00c5tx\u00c4<\/p>\n","protected":false},"excerpt":{"rendered":"

2ed\u00a0Semester Examination June 2011 Physical Chemistry (Electrochemistry, Molecular Spectroscopy and Quantum Chemistry) Examination for the 3rd Year Chemistry Special Page 1 of 2 —————————————————————————————————- Answer Five Questions Only of the […]<\/p>\n","protected":false},"author":1,"featured_media":2561,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-2560","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-18"],"yoast_head":"\n3rd YearPhysical Chemistry (Electrochemistry, Molecular Spectroscopyand Quantum) Chemistry - \u0643\u0644\u064a\u0629 \u0627\u0644\u0639\u0644\u0648\u0645<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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