Chem 43 Midterm Exam 2 Answer Key 10202009

Chem 43 Midterm Exam 2 Answer Key 10202009 - C hemistry 43...

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Chemistry 43 Midterm Examination Tuesday, 20 October 2009 Name: Ans~ k~ Answer all questions completely and concisely. Give an explanation for all your answers. There are 10 questions on 15 pages worth a total of 100 points. You have 75 minutes in which to complete the exam. Write your answer in the space provided below the question; if there is insufficient room to do so, use the back of the page on which the question appears. For computational questions, please circle your final answer, taking care that it notes clearly units of measure where appropriate. Read the entire exam before beginning! 1. (10 points) Exactly 1 mol ice is heated reversibly at atmospheric pressure from -20°C to 0 °c, melted reversibly at 0 °C, and then heated reversibly at atmospheric pressure to 20°C. AHfus = 6007 J mol-I; Cp(ice) = 38 JK- 1 mol -1; and Cp(water) = 75 JK- 1 mol -1. Calculate AS for the system, the surroundings, and the thermodynamic universe (AS total ) for this process. S Ie p 1-' 4.)CII'Yn;"O 15' It.e. . ~ ~ k p 2 ~ #)e/I;~ cJ;f /u; J"* ~ 3 ' t.Jorm''Y() (/ ~ /720 A $ - /?~~4 (7;/f-;) 11 S-!'fflP.t ~ (2: () rn/) (3 R J/A:.tnvt) ~ ( ;/7. .) / 02 n := 2, 9 J / X A~It-,ad ~ (;,Op'crI){/. .rJ4rnf)~ (O<7'U?3):::- s-; 3 J/k @ A Ss It';? 2:::: 9 r e vj r .=:. . b~() '7J 2'7.3 k (j) f-2 2/0 Y/Ic =- 30,,02 J/Ic C) o ®
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2. ~~ p~ints) J:!ypofluorite, FO-, is a highly reactive oxyacid derivative that can . y e studled_ at lo~ t~mperature. Draw a molecular orbital (MO) ener dl~~~am ~r FO'hProVlding ap~ropriate labels for both atomic and mole3ar or 1 s. ~r eac energy level In your MO energy diagram, sketch the correspondIng molecular orbital. Based on your molecular orbital di h can you state regarding the distribution of the negative charge in Fa- ~gram, w at 1If<o-J~(Op)(- FP;) ( \ / ._._ - 0. __• f M~: c.LPecc;w. .{e-H·,/S /7?(}re- e/ech/?8~1J-ve) ~.s &,/Jt:! P;, ~~/~ ~r);;Ift/~ ~e /~ Clkm/ CTY' )M, 7kq/?~b~~ ~O,.5 ~-l v /)4V€ more Oc~~~ /JJt:;r; F ~~~r, P'e J;~'h~Ji -,ell/pc;! m().,,) .77-¥- ;D-;c.-,s, };4./, /J?~ - (") ===::;; l7eqCj75.~ cf:A~~ ~--.A~~/lh~
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/J ~ (0 , (j) +- G Js 0 2t£;p- I I ro* : 0- (£) -=:) G \ p~ G>cD G>C3 °P)l. rp / P6~ cx:D [email protected](2) ~1~ 7(: ~+ % -==;;; °FJ r;~ 77 1 cg - ?] =? m '( 5~//Je /en- ~tp.J"pd>?dn. ?~ -cle,'V~cI ?r cYh/ M
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3. (5 points) The allene molecule has the following Lewis structure: H H =c=c< H H Must all four hydrogen atoms lie in the same plane? If not, what is the spatial relationship among them? Why? No, the CH
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Chem 43 Midterm Exam 2 Answer Key 10202009 - C hemistry 43...

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