Exam 2 key - C IIM L 3L1 G eneralC hemistry 1 F all 2 404...

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CIIM L3L1: General Chemistry 1' Fall 2404 Exam #2, Oetober 6, 20M Name lonnq 4 n St'€r'- )< *- ,r* Pledge: I have neither given nor received aid on this exam: For ALL problems: SHOW ALL WORK TO GE"t FLILL CREDIT Signature Useful equations and constants KE = !*v' z Rydberg Equation: Bohr model of H atom: electron: proton: neutron: b = 2.18e-18 Ln=m eo b ; - - T n n n " h mv Rs = 109,678 cm-r charge (e) = -1.60e-19 C c = ) , v E = h v i=^"( + A mass (m") = 9.1093897e-28 g mass = I.673e-24 g mass = 1.675e-24 g c=3.00e8 ms-' h=6.63e-34 Js 1 amu = I.66054e-24 l mole =6.A22e23 DO NOT WNTE IN THESE BI'LNKS (4) (2) (4) (2) (3) (2) (4) (2) (s) 10. (2) rr. (2) 12. (2) 13. (6) 14. (2) 15. (4) 16. (14) r7. (2) 18. (2) re. (2) 24. Q) 2r. (6) 22. (3) 23. (2) 24.(dJ4) 2s. (2) 26. (2) 27. (6) TOTAL (100)
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CHM 1311: Exam#2 Paee 2 of 10 October 6,2004 Name 1. (4 pts) Using the Bohr model, calculatethe frequency of light emitted by a hydrogen atom during a transition of its electron from the energy level with n = 4 to the level with n = 1. a. 1.028 x 107 s-l b. 1.215 x 10-7 s-l c. 2.467 x 1015 s-l (-a)t.a$ x loi5 s-r e. 8.228 x 106 s-1 , '. 1,l : G pl , r'P '-4elf s. | *e) A F = - t ( 1 r \ +-L- i ): o 93?fxb = o"93?rx 7, lgtrro-18 J \ Z . o 4 X t a - r ) 3 - = IrtV ryo:'u = B.o? xror$"=t (o"b\xr,f s"l 2. (2 pts) Given the following Lewis structures, which molecule is nonpolar? a) d:s'-ij. 3. (4 pts) Give the symbol of the element of lowest atomic number which has: Cr five unpaired d electrons three 3p electrons 4. (2 pts) If the octet rule were firmly obeyed by arsenic atoms, which one of the following ions of arsenic could befound in arsenic compounds? a. As- )- b. As-
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CHM 1311: EXAM #2 Page 3 of l0 October 6,2004 Name SSN 5. (3 pts) Consider the aluminum atom. For how H r = , ach. man 3 y electrons in this atom does: ms = *Il2 mt= 1 and mr= +ll2 &'q'^)s vvt *1,*W 'ru 3P et-2L*u^ iE es: +[z= or -'r- 6 n T l n L 6. (2 pts) Give a set of 4 quantum numbers for one of the unpaired electrons
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