chem1A-spring05-mt2-Chandler-soln

chem1A-spring05-mt2-Chandler-soln - Chem 1A Second Midterm...

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Page 1 of 8 Chem 1A Second Midterm Examination March 7, 2005 Professor David Chandler Page Possible Earned 3 45 Name: _______ KEY _________ 4 20 5 15 Signature:_______________________________ 6 20 7 20 Section: ______________________________ 8 15 GSI: ______________________________ Total 135 Instructions As indicated, either fill in blank space with appropriate symbol or number or circle the correct answer(s). Some multiple choice questions may have more than one correct answer, in which case all correct answers are required for full credit. Use back of pages for your scratch work.
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Page 2 of 8 Formulas and Physical Constants you may need: R = 8.3 J . K -1 . mol -1 = 0.082 L . atm . K -1 . mol -1 k B = 1.4 × 10 -23 J . K -1 0 K = -273 ° C Avogadro’s number, N 0 6.0 × 10 23 mol -1 Planck’s constant, h 6.6 × 10 -34 J . s Speed of light, c 3.0 × 10 8 m . s -1 Lowest (ground state) electronic energy of a hydrogenic atom with nuclear charge Ze, E = -R H Z 2 , R H 2.2 × 10 -18 J Average distance of the electron from the nucleus of a hydrogenic atom of nuclear charge Ze, a 0 /Z, a 0 0.5Å = 50 pm: Coulomb potential of the hydrogenic atom, A particle of mass M and momentum p has kinetic energy KE = p 2 /2m And DeBroglie wavelength λ = h/p The energy of a photon with frequency ν is E = h ν (2.3 × 10 -16 J . pm) Z r - - Ze 2 4 πε ο r -
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Page 3 of 8 1. A Lewis (electron dot and bond) structure of water is H H O . . . . 15 pts (a) With similar drawing conventions, give a likely Lewis structures for the following compounds (placing each drawing adjacent to the formula): i) NH 3 N H H H ii) CS 2 SCS
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chem1A-spring05-mt2-Chandler-soln - Chem 1A Second Midterm...

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