cem181f06b1a - Chemistry 181H Fall 2006 Bonus I Thursday 26...

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Unformatted text preview: Chemistry 181H Fall, 2006 Bonus I Thursday, 26 Oct 2006 WRITE your Name *KQF Student Number Recitation Time: Monday There are Four questions on this exam. Write your answer, showing all work to each on each page. A list of potentially useful equations is on page 6. A periodic table is contained on page 81 total / 39 1. In a recent experiment, a gold atom was trapped on a two dimen- sional square surface with an edge length of 50 nm. The surface was flat so that V(x,y)=0. The experiment consisted of observing the emit- ted radiation as the atom slowed down and went into its ground, or lowest energy, state. (a) Write the quantum numbers of the ground state, the first excited state and the second excited state of this system, be sure to indi— cate if each state is degenerate or not. (6 points) 2 ’D .9 Z 631%»(5!) Mfi‘dnwe Axwa Merged J, (2,.) ex 0,2) AEWQ E; 39.21%) W Webb}. —--‘2 (1,23 MO+ ALWL (b) What is the energy (in joules) of the photon that will be released when the gold drops from the first excited state to the ground state of this system? (4 points) AE. [(2,0—7 (“6) ___ L (21+ ‘2) _ (l7,+l?.) Mt} 2. Answer the following questions relating to atomic structure. (a) Calculate the effective charge, Zeff on the nucleus acting on the outermost electron of a boron atom. The first ionization potential of sodium is 0.8006 MJ/mole. (4 points) 5; —13.aoev 3%,“, 6 2- I o,8>ooa 31374.4( 1H0 T/MS 2k 2. 1 h. I340 9U x PA [Mail 'K Ham-Mg f [14» JUL: l.% (b) Calculate the amount of energy necessary to move the single elec- tron in a Be3+ ion from the 2s to the 3p level. (4 points) 753+» w Lbél\m)fiwha&wmfl4fiu l bfitibs'z It DE“- EOUZ) Ill-(MEL) ., AE—f-‘lgl, 9V[:l': _ :. ,lg_éa\/ : 43$ NM? 31. 4E : gartev o’L 4.31;“5“? A my. rat/ma (c) (2 points) Give a simple, concise explanation as to which ele- ment antimony (Sb) or samarium (Sm) might be used to create a stronger magnet. 6’64; New 36 19»ch *0 3mpcw3— ‘ ‘ , “9M Mtiwamwaf rm” mall. mpmé elk/“lbw; 4- 0lww<6wk "MW 3. Use the following information to estimate the standard heat of forma- tion, AfH", in kJ / mole for barium chloride: Ba(s) + Clg (9) => Ba012 (5) + AfHO -2056 kJ / mole 503 1251 965 2297 ~ 0 -349 239 Lattice energy First ionization potential (Ba) First ionization potential (Cl) Second ionization potential (Ba) Second ionization potential (Cl) (‘83 4. Write the Lewis electron dot diagram for each of the following mole— cules. The central atom in each molecule is listed first. Be sure to indicate the positions of all the atoms and lone pairs of electrons. Also indicate any resonance structures. (3 points each) L ° :02 +94; (a) nitrogen dioxide molecule, N02 ’1 0W. (b) Tellurium tetrachloride, TeCl4 Q/ 60 — WM “mm” :" /Te " A M W PM u .(m/ \Qé’: “mam- " fl *“lu'bfi’z‘ (c) Iodine trichloride, 1013 Q (M0 Albd‘A-MC‘B ...
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