Download 22 Questions in Inorganic Chemistry - Exam 1 | CHEM 401 and more Exams Inorganic Chemistry in PDF only on Docsity! Chemistry 401 S.O. Grim Name _______ 27 Oct. 89 Hour Exam I Social Security No. I. Short answer (3 each). 1. Give the electronic configuration o 2. Give the ground state term symbol for Yb3+. 3. Give the ground state term symbol for Cr. 4. Give the ground state term symbol for 5. Whrite the equation for the reaction that represents the second ionization energy of magnesium. Score I (15) ___ H (21) __ m (15) ___ rv (io) ___ V (38) _____ VI ( 3) ___ Total (102) II. Multiple choice (3 each). Print the letter corresponding to the correct answer on the line at the right of the page. 6. Which is the smallest cation? (a) La 3+ (b) Eu3+ (c) Yb3+ 6. _____ 7. Which compound has the greatest covalency? (a) A1C13 (b) AlBrs (c) MgBr2 7. _____ 8. Which has the most endothermic election affinity: (a) O- (b) F (c) Cl 8. ______ 9. Which is most electronegative orbital? (a) N(sp) (b) N(sp3) (c) N (pure p) 9. ______ 10. Which has the highest vapor pressure at 100°C? (a) OsO2 (b) OsO4 (c) OsiOs 10. _____ 11. Which has the largest dipole moment? (a) NHs (b) NFs (c) BFs 11. ________ 12. In CH2F2, which angle is the smallest? (a) HCH (b) HCF (c) FCF 12. _____ III. (5 each) For each of the following draw the electron dot (electron dashes please) structure. Give the hydridization type of the central atom, the electron pair geometry, and the atom geometry (for the latter give a word description as well as a sketch with angle estimates for distortions from the expected values). hybridization e.p. geometry atom geometry 13. IC12' 14. TeCU a. Which direction does ui point in the cartesian coordinate system? b. Show that ul and u2 are orthogonal. c. Show that u2 is normalized. d. What is the fractional d character of u2 (show calculation)? e. What is the hydridization represented by these hybrids? VI. 22. (3 points) Sketch the molecule R.3P=O (a tertiary phosphine oxide) using lines for the sigma bonds, but draw the orbitals involved in the pi part of the double bond. Label two coordlinate axes, name the orbitals used, and place the signs in the lobes of the orbitals. Extra credit (2 points) What is the instructor's favorite element. It must be spelled correctly for credit. Chemistry 401 Data Sheet (all energies in kJ/mol) lonization eneries 1st F 1,680 Cl 1,250 Na 496 2nd 3,374^ 2,297 4,562 F Cl O Electronegativiries 4.0 3.2 3.5 Sublimation eneries Na 109 Mg 141 Al 295 ionic character (Pauling) and electronegativity fractional ionic character = 1 - e " Electron affinities F 328 Q 349 O 141 Bond Dissociation Energi.es F2 154 Cl2 240 Br2 190 Enthalpies of formation (AH) NaCl -411 NaBr -360 MgF2-1,103 bond length and bond order (d is in picometers) d(n) = d(l)-711ogn s - character cos 6 = S S-l
