Exam IV key - /EXAM IV CHM 15 UN Fall 2009 NAME 1 Draw the...

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Unformatted text preview: /EXAM IV CHM 15 UN Fall 2009 NAME: ' 1. Draw the complete Lewis Structures for the following molecules and molecular ions: (40pts— 5 points each) a. CH3Cl F} 1K ~C "H l 2 C1 b. N0; ‘0‘ . \ ‘ N: 0 .‘ I” d_CN” YC‘EN-‘hl )1: eAlF; "1 o. #Arlx :F/ F n “O: fPOI ~- it - 3 Li” \“ .. \ 3:: :I; “ g.N2 , ; EN“: h. SCO ‘: r (/50 2. Define the tenn Lattice Energy, use some examples to explain the trends in lattice energy for ionic compounds: (Spts) fimm 33ng "‘0 awake, Semi“ “his 09 W week; “‘10 at": 944:.- MW) {‘U’WS. , Um/ gang Mia Home (1A3. ~1un 40 2mm "'1‘; 1N3“ 0N; SWV ‘ m; m, Marc A . 3. Draw the Lewis Structure for CHClFl, the carbon atom is the central atom with Hydrogen, Chlorine, Fluoring, Iodine around it. Label the most polar bond in this molecule. (Spts) ,6 “Cl: .1: m ” L. H y ._ ‘ 'm ‘.\—— a ) :l’t\_/ CF17 5‘59 “3‘1 IM%V\ 310$“)me 4. Label the number of electron domains around the central atom and the molecular shapes of the following molecules. (20pts — 4pts each) LABEL THE MOLECULES AS POLAR OR NONPOLAR. A)CC14 :3}: c} Cc,,\c1J\Ix/\7evflfi-‘£ .1," .. :C-—q '. ‘ijgg.§.r.9 New“ e S‘K‘U‘QP B) SF4 ,x { dLWNADNZWDA fl ‘EF'.S:EK: 30;, ~92») M 1‘ i'F? 5‘? [El/j vim L‘W“s“"mM“fl 0st *ztwlwm We; (KL 3‘ ~ . ‘ of Iflul‘ 5:. gm} M )1wapr A” A flail? D) 1C13 __ “1.: .. . 3‘ ‘ 3N: (‘ ’A WC\ - > WWW“... "\— ”pg, .. \ - $.an 2L \‘ “ .w. E>NH3 . « ,. Mid, -/ N \ L [a Sew/x n H i H 1 CC :9 , who Wilfrid“ 5%” l"\ P—hficfv Pay/Ix , EFIKWL/ ‘ 5‘ Use discussion of formal charge to explain Why the best Lewis Structure for C02, has two double bonds instead of one triple and one single as shown below: (5pts) “0: C265: “a ' :Ej—CEQ'. l0 0 O k-\ 0 “H finmfl cumbm ' gfimg twat wee +9 9m 4: kilo M3413: We: airs M cm awiw . 0L \D cm»! 6. Using Bond Dissociation Energies, calculate the Bnthalpies of the following reactions: (l Opts) a. The complete combustion reaction of Cyclopentane. ’ ' 4— EC CI. Cfi—MO'i’E—O; ”=5 5 ‘H’LO 4, 0 Remember thiisaline structurel, w ' eout the balanced chemical reaction first. <§Ccegs marl-b + g: (pr-OB) ’ le (00%) + IOCC$0>> (stow) + 0(4ng + 1%: Mg) m (lDC‘iLORD + to (@3160) 2 7582.5" .. 126220 e -503“7,S’ Lazar: WEE/{:0 n ‘ A, . + 3 1-3: flamlémdgax & “fish“ ,4, 40:210. Z- b. 2NH3 a N2 +3H2 fl (Na/U 'r 3C”“H)) : 3U \JFI p—L. a: \ w 9) 4:. s \l '4 cl 7 E ”gab/WWW; QICLLRM [Ml Dice lupO Silica 7. Convert the following expanded structure to condensed structure. (Spts) H H I? H “Whininéwg Cub C—ch‘lszivg 51 H g; H “3““ C. ,/ 0” QH \\?H V”: :4 \{J , /. Phenol \CH 9. Convert the following condensed structure to an expanded structure: (4pts) A I“ H “KC/H GarliH—CHE a“ :0 \ / \ “ E § 0 ‘ D \H or»; QH on / -° 0‘. * 12,3?mpanmief “A ‘. "H Nye-43ml; gayeea‘in 10. Convert the following condensed structure to a line drawing: (3pts) ‘fHS CH3 —£‘!I-CH3 J\ {5% E’Meth- law no anal xvii-u??? agenfin ‘ ...
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