quiz4_key - Chemistry 1 14 Quiz 4 Fall 2007 Name 1 Give the...

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Unformatted text preview: Chemistry 1 14 Quiz 4 Fall 2007 Name: 1. Give the hybridization for the transition element in the following: (1 pt) NH4lAg(S CN)2] 3:"; {g 1 l 2. Explain why [Co(CN)6]3_ is an especially stable complex ion. ‘. (4 ptS) at)” ,btaew%._ tidbit M a v _.. I? “a ; wéhfib ahea§%e V 9’“ ifwfl’wz WE? Vifitfiflgn ti 3. Consider the following three cobalt complex ions and th color that each appears. a) Fill in the table for the predominant color of light each complex ion absorbsfiifigfii v one ‘ %‘ www‘mdwrtm%$%a w” ' E3 i; $5 5" ‘2? g» E“: yellow—orange appears tame»; Vs Dnfir absorbs b) Use the above data to arrange the three ligands NH3, H20, and F— in order of decreasing ligand field strength (d—orbital splitting). Number 1 should have the strongest ligand field and number 3 should be the weakest. (2 pts) D Dug PW m__ngQ_w. m -2- 4. Why are there both low—spin and high—spin octahedral transition metal complexes but only high-spin tetrahedral complexes? (2 pts) E; (1;? 5% Eflfll L1 KAN“. lAm—mnmmxsmwflx *u-s ? flea if Jam 1“: m W E (is 5. On the right is a single unit cell for a compound of titanium, calcium, and oxygen. (1 pt each) a) How many titanium atoms are in the unit cell? 1 b) How many calcium atoms are in the unit cell? I" 5 {EffigB flirt 51 Mafia; Au. MW merge Air c. _ A I u M w \L a {VI Amafiéw eMw {lighterth w an... 'OLQWit‘w-tfi‘fia Maw straw c) How many oxygen atoms are in the unit cell? (0 W2) =a— 53;: (rm, ersa,.a> d) Give the empirical formula for this compound. Ca, “Tl {>33 e) What is the coordination number of titanium? (4,» (‘37 WM"! mime fitfibfig‘étimfi> U i) What is the coordination number of calcium?- 3) (53w \K ( {ruin-wt «Sittfii‘épa’ g) What is the coordination number of oxygen? a(T: h) Assign reasonable oxidation numbers to Ti, Ca, and O. :kf M" are: 5 i 0%“ \ mm! W m- nwfiai 13% “r mix-«max (Wm z: {32‘ Chemistry 114 Quiz 4 Fall 2007 Name: 1. Write the formulas of the following complexes: (2 pts) a) cis—diaquadichloroplatinum(II) EMT: “am gm {grail b) diamminetetracyanéfiochromateall) Urtgimgyk (emu j " 2. Consider the stereoisomers of [C0(HZO)4Br2]+. a) Draw all of the stereoisomers. (4 ptS) Em "‘19 jLw—m an 13,," /<1-w / t2 l?» Twain b) Identify which of the isomers, if any, are enantiomers. (1 pt) We Wheel; Cswwz-«a no dew swam Meme 0) Identify which of the isomers, if any, are ciS/trans isomers. (1 pt) -2- 3. Magnetic susceptibility measurements show that the octahedral complex ion [Mn(HZO)6]2+ has a different number of unpaired spins than the octahedral complex ion [Mn(CN)6]4_. a) How many unpaired electrons are present in each complex ion? (2 pts) wipes.» 5 $51th 3&93; “‘1‘ WOW?“ 5 warm «1 b) Explain why the number of unpaired electrons is different in the two complex ions. (3 pts) q LLL at, w fir V . it. 16:; :L t (M iv apart I, mm layman! m = gimp) mpgm lama- fisasgraw ” All; ‘1 . “ 6L Dmitin A o l l “” MIA. 1) g; Qa’ 4. Replacing the water ligands in [Fe(HZO)6]3+ by cyanide lig nds changes the V olor of the com— plex from almost colorless to deep red. m L W . hy" . «a . Fa. \ ill in! ME. m ‘i‘ a) Explain why [Fe(HZO)6]3+ has a very pale color. (3 pts) w ‘ . mob Wm” wle we wflw rely-vats WWW (Kiwi; aw drfilfww i « an" a, .\fi ,’ . » '_ eh; ll, 3 W“ L fot‘v" Q .0 M! m” L!” I gamer/t Mama. gfi-‘éfiam mart; WW maximal; IL L L 1’2, 1%“ My ' f? (ta if: s w. a. d :9» .yt fibgfifiymi}, » ‘Cmfiyflafk‘g ii- —-» - my w? was! b) Give the formula when the water ligands in [Fed-120%]3+ ar replaced by cyanide ligands. (1 pt) u '1’“; I live, Comb J c) Explain why replacing the water ligands in [Fe(H20)6]3+ by cyanide ligands changes the color of the complex to deep red. (3 pts) , Lariflmamww (:3 M Vfivf fléltém } j “9th W4“ ‘5 my} mem m. ski «2,23? (m) {Writer Ugfl’fix-‘ww WBVZC’R” 9'“ Wm’ég W; fi‘ét fi-MMXD (3- I M 1r— tr fl: J Chemistry 114 Quiz 4 Fall 2007 Name: 1. Clearly show your work and give the oxidation number for the transition element in each of the following: Opts)“ x «ml a) NH4[Ag(SCN)2] X — l *l :7 y: l at X Wu b) Na4[Mo(CN)8] Y _, (g a w. Li W, W 335 2. Consider the following five cobalt(III) complexes and the color that each appears: ' \I 5; a [Co<NH3)5<SCN>12+ [Co<NH3>613+ [Co(NH3)5(H20>13+ [Co<NH3>5CI]2+ [Co<NH3>5<N02>12+ orange yellow—orange red purple yellow abmrba‘. Mam: mirage-i; mm [Cat-mm MM: Use the above data to arrange the five lig nds SCN", N 3, H2 , Cl", and NO; in order of increasing ligand field strength (d—orbital splitting). Number 1 should have the weakest ligand field and number 5 should be the strongest. (4 pts) 1) ('93 2) 5“! r;[email protected] 3) 3m)?” 4) “M a, 5) N031. “" 3. Explain if magnetic properties can or cannot be used to distinguish whether a COpp61‘(H) ion is in an octahedral, tetrahedral, or square planar crystalline field. fl (3 ptS) 0“,ng " EA‘N'A m it :1» a a :t it , t it" 1‘16 OrbvtaN..dM£ m" “4 flfirtiawu ("(fiert’ an. tram m... allegiatétiw a" Walla-M'im WWW. Grimm afiiiafihugfaaéic Mam,“ “'élia‘m) gmmémrig -2- 4. Consider the stereoisomers of diamminedichloroplatinumfll). a) Draw all of the stereoisomers. (2 ptS) My ’9 . l W; m ‘ Wm“). WM u, M We first}: (Lifiz “WMN 19* b) Which isomer would you expect to absorb at a longer wavelength and why? 2 ts) , .‘ ( p w a W a ‘ Maw wwfim 5%! we? WWW” I 5 :57 lame 5. Fill in the following table by giving (1) the oxidation number of the metal in the complex ion and (2) the expected number of moles of ions the complex would give upon dissolution of one mole of the complex in water. (4 pts) complex metal oxidation number number of moles of ions X 4” l -\ [Pt(NH3)3Br3]Br ’ I'm.» 2;) at e;- Kg, wt w \ [II‘(NH3)4(H20)2](N03)3 L4 H x w! NH4[AuCl4] . rude wl 75”? WW 9", M 3:: “3w K2[MoOCl4] xuaauhgucnxdl ' 33’ 6. If an iron(II) complex is tetrahedral how many unpaired electrons are predicted? Explain/jus— tify your anSWer. 33* ‘ w ‘ ,. ' (2 pts) . ‘3) L. l. 1 Mil; ‘€:t:imt§mtaxii omfith‘ Me kggdififéw ‘55 , l w ’ “Lit filth" 21*? Li umfiftriirtséw {L (é ...
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