midterm2_answer

midterm2_answer - VQVS'JDA A 1 Naming compounds Provide the...

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Unformatted text preview: VQVS'JDA A 1 Naming compounds Provide the systematic name of the following compounds: 1. 1205 : :0 4 points 2. Hg2Clg 2 MQTCM Chiy:d2’ 4 points 3. LigCrO4 : Chromm 4 points 2 Electronegativity and polarity a Rank the following elements from largest to smallest electronegativity: Si, Sn, C7 Al. Answer: C ) Sn 5points b Rank the following bonds from smallest to largest polarity: Cl—Br, Cl—Cl, Cl—I Answer: ,CI ) Cl—fgr ’1: 5 points C Does NBr3 contain any polar bonds? Does the molecule have a net dipole moment? Explain your answer. Answer: Gwap Lmd§-:3¢$ MW?! _. 6 points 3 Lewis structures Draw the most stable Lewis structure for the following compounds and indicate the formal charge on each atom. a B174— (7 points) U " 147mm claws ’5: ~I F: 0 4 VSEPR and valence bond theory For each of the following compounds7 give the hybridization of the central atom and write down the electron geometry and molecular geometry. Discuss any deviations from ideal bond angles. a XeC12 (8 points) on .' '0 u :a — x1 44 ' I- '0 " b PC13 (8 points) (5! VI “ /?~éh ( N :0“ s03 l etc/z.th Wé’b- 353%) ‘ mombllav‘ firm ~ 27M“ 7:32?me WM 525C“? 4 107.50 lxcausm 0:4 W 2 lava. Tam. A 5 Resonance Rank the following resonance structures in order of stability, with the highest number being the most stable. If a structure is completely wrong, give it a ranking of 0. Some structures may have equal stability and therefore will have the same ranking. Explain your answer. (8 points) =c':'I= =€I= :6]: =61: , l+ Ari-H I ~ l C; a £2 r ant strut—W” IV‘CO “8 wzek L951“ 04;? on WW" mW~ M W‘ 0‘} t Fame: 60:96 7“ i9“ I40 _ mmmw mammal 6 Lattice enthalpy and bond enthalpy a Use the bond energies to predict AH for the following reaction: The bond enthalpy for the N-Cl bond is 200. kJ/rnol. a. ,1 a a! /N: 9 2NOCl(g) —) 2N02(g)+012(g) _, dun)": C} :0 (I. H t. l' H Atlfm 1'24”st {tram — 2 AH Mds W —.- [am/=0) + «MN-cl) —- Lemming/£0) + I(<:I~</)J = 30100) —- [202004 ((2341? Answer: ’ 2 6 points b Which C-O bond is more stable, CO or C02? Explain why. ,0 :CE 3 '0’: C20 0. 0' Answer: C E a ) W (A [ID/k4 4 points 7 Organic molecules a Draw the Lewis structure for this molecule. (8 points) CeH5Cl£4 C\ /‘-\ l.» AKC/ ~ //\ 01' I, I or I‘ ,c ,er V llr \Cg/ {Lil b Write the molecular formula for this molecule. (8 points) HO O 0 Cu llng H0 HO CH C Draw the line structure for the following molecule: (8 points) (CH3)3COCH3 w- [/Qvgion B 1 Naming compounds Provide the systematic name of the following compounds: 1. 12012 : CJ‘ "0 :M 4 points 2. KClO : MW R 4 points 3. F8283 : I‘ ran 4 points 2 Electronegativity and polarity a Rank the following elements from smallest to largest electronegativity: Si, Sn, C, Al. Answer: A ‘ Sn S; C 5 points b Rank the following bonds from largest to smallest polarity: Cl—Br, Cl-Cl7 Cl—l Answer: Q. ~_’[ Cl ,- Br 0 -1 5 points 0 Does AlCl3 contain any polar bonds? Does the molecule have a net dipole moment? Explain your answer. Answer: Goldr ., no mow? 6points :Cl" 1 Al . , \ (.61 C’ 3 Lewis structures Draw the most stable Lewis structure for the following compounds and indicate the formal charge on each atom. a C2H2 (7 points) H_CEC PH all 67w! €1,363; arc O b NH: (7 points) 4 VSEPR and valence bond theory For each of the following compounds, give the hybridization of the central atom and write down the electron geometry and molecular geometry. Discuss any deviations from ideal bond angles. a XeOF4 (8 points) Sqst aluan (am/W " Odamm up, MOQLMW 4510M“ " 57M l‘q ’ m: 325%; 470° " S ’a I S l ‘ ' / j" .- 83;ch (flapma 79' ESMM’CE/ :61: Momqu (600“ " "W24 470° M 99:3”? 5 Resonance Rank the following resonance structures in order of stability, with the highest number being the most stable. If a structure is completely wrong, give it a ranking of 0. Some structures may have equal stability and therefore will have the same ranking. Explain your answer. (8 points) =61: =61: =C'I: =c':'I= t ~ i ~ | H iv V3 (34%} MN: 42 07. o' ' \ resonancc 32W“: 353’?“ «Col/mat depng 5&6“, CW5 axymdad nm‘ MPnimigd W'mm'w' €43 lrlCOMflMK act“? on” 6 Lattice enthalpy and bond enthalpy a Use the bond energies to predict AH for the following reaction: The bond enthalpy for the N—Cl bond is 200. kJ/rnol. . 2N00l<g> a 2N02<g>+012<g> ,, :0 '1'?“ ” DHrm: f. AHlmcls Iron": ~ 2 AH 104.); (and 5[2(y’~{)+ WAR/)3“ [261100) + Jar-'6) + Mal-<0] 529000)] — (Mam) + “25:03 Answer: "‘ /mol 6 points b Which C—C bond is more stable, the one in C2H2 or in C2H4? Explain why. _. /H H. ,- C2C' H H ‘C2C\H /+ Answer: C} R; I“) 1y". ( u 4 points a I, H ,Nzo :q/~cx: 7 Organic molecules 3. Draw theI Lewis structure for this molecule. (8 points) 0an . ‘ t I. .0. ,, “:- xcbt C /C- In!” / \ .F; .r I a": of: ' '0'. b Write the molecular formula for this molecule. (8 points) 0 C? HS N303 @(fim Fe 00 c Draw the line structure for the following molecule: (8 points) (CH3)3CCH2000H flaw W WSI‘O‘A C. 1 Naming compounds Provide the systematic name of the following compounds: 1. 01205 : NXON‘J’Q' 4 points 2. FeS : iq-on 3.4”“; 4 points 3. KClO4 : '1>ofa$5‘,um 79rd4/orate— 4 points 2 Electronegativity and polarity a Rank the following elements from largest to smallest electronegativity: As, B, Sb P. Answer: P i S 5 points b Rank the following bonds from smallest to largest polarity: O—N, O-Be, O—O Answer: 0-0 ) 0...” ) 0 -81 5points c Does B6012 contain any polar bonds? Does the molecule have a net dipole moment? Explain your answer. Answer: m 0(a- bMdS A0 mi. J" 0% 6points Kl “ :0 ~30. -— Cl '1 U u. 3 Lewis structures Draw the most stable Lewis structure for the following compounds and indicate the formal charge on each atom. a CH3CH=O (7 points) I4 :0: fill 53W; have 0 I H W19! (1149:?— H /C -C\ {'0’- l H 1+ b AlClZ (7 points) IC( (,l' . ,. CI', 0 C@& 1' / " {5| CI: 4 VSEPR and valence bond theory For each of the following compounds, give the hybridization of the central atom and write down the electron geometry and molecular geometry. Discuss any deviations from ideal bond angles. a XeF4 (8 points) 1' t. sfldz 2’: \Xi’f flach flat/mfg: ocramdra/ ," ’ "WE: Mommy/30mg: 37””? Van?” " JooAcl 3556152 90")”0 dISZ‘D’bWS b 1C1; (8 points) . , ’41 30’34 ‘ ‘ .HI .. mm (@0me gym $193,de macaw ,st’tm "My bowel 694505; @7140 (fife/flows 5 Resonance Rank the following resonance structures in order of stability, with the highest number being the most stable. If a structure is completely wrong, give it a ranking of 0. Some structures may have equal stability and therefore will have the same ranking. Explain your answer (8 points) 0 =0 0 2 ~ g ~ 2 H a 4 H/ \KIH2 H/ §NH2 H/ §NH2 H/ \NH2 ; C) O l ‘ odd 0am {or-Mal Mal {‘(Ak FMlz CW5 $350 vl0196€d woe-ed “0% WM . . firm! m C)” Miflimly“ 0435’“ Mcawfafi Odd MC 6 Lattice enthalpy and bond enthalpy a Use the bond energies to predict AH for the following reaction: H 5‘ .H H\ x A H A c — C» H C2H6<g> a 02H4<g)+H2<g> C=C\H + H .. t I / H H H AH = fiAH Wampum —- 2 AH bonds fem: :[Lo (H’C)+ICC‘C)1‘[{I€C=C) +Héc-H) + ICH-HU = [0148) +184?) —- El (60"!) +9 (45) +1062) Answer: I 97’- L’. m a] 6 points b Which C—C bond is more stable, the one in C2H4 or in C2H6? Explain why. {‘1 I“ '4 N KIJ / \ / \ N: N :4 H Answer: 371491431 )5 a dowbk 4points 7 Organic molecules a Draw the Lewis structure for this molecule. (8 points) C6H5CH3 A l / C” IL H~ / C ‘ I H / \ C K C or H. b Write the molecular formula for this molecule. (8 points) HO C” HI? OVCL; 9H Cl HO 0mm l/x Ho ; "'o g 0 (3“ \Cl 0 Draw the line structure for the following molecule: (8 points) (CH3)2CH(CH2)3CH20H we >\/\/\0A Vqrg; on D 1 Naming compounds Provide the systematic name of the following compounds: 1. P483 3 )4' d2_ 4 points 2. LlQSO3 : Sud-f.) fig 4 points 3. ‘ CrBr2 ; ahram‘lMM (it ‘4 points 2 Electronegativity and polarity a Rank the following elements from smallest to largest electronegativity: As, B, Sb P. Answer: S E B 93 E 5 points b Rank the following bonds from largest to smallest polarity: O—N, O—Be, O—O Answer: 0 .. EL 0 _ A) 0 -0 5 points 0 Does H28 contain any polar bonds? Does the molecule have a net dipole moment? Explain your answer. Answer: rrdar ’bmdg— (ZS mWT~ 6p0ints D 3 Lewis structures Draw the most stable Lewis structure for the following compounds and indicate the formal charge on each atorn. a CzH2Clg (7 points) I' 1' If |l' :9. C! fH 1" ‘\ I x / l ' “‘ :c or C=C 0” Czc C ‘0' / ‘H / Ctr ’ ‘ " 31! am («an o Ml chagr- :Cli In 4 VSEPR and valence bond theory For each of the following compounds, give the hybridization of the central atom and write down the electron geometry and molecular geometry. Discuss any deviations from ideal bond angles. a XeOFg (8 points) :0; stcl ‘ . 1 “ eker 30MB : Ugo fit WWW po' 1" molecular (310M133 T” M bone! 945L425 = 4‘70) 4150 " 9995 had/bl fl I draw com?- 7 will? H Momtuwtgmrm 5 WM 715%“? rwaa 325% Alml‘S" 2 5 Resonance Rank the following resonance structures in order of stability, with the highest number being the most stable. If a structure is completely wrong, give it a ranking of 0. Some structures may have equal stability and therefore will have the same ranking. Explain your answer. (8 points) :0: :0: :O: :6: H/ \NHZ H/ \NHZ H/ §NHZ H/ §NHZ .9. I O O (yml AWN" Ca“ N d N can‘t aha (zit cum ‘5‘ t”“”" “’79” m ' minimigu (an 0) Immune,“ (xfct an 0 6 Lattice enthalpy and bond enthalpy a Use the bond energies to predict AH for the following reaction: ,0, ‘ u _ . u .. 5:9: 9‘? 2502(g)+02(g> 6 503(9),, ,3 \ .. A :‘0' no» 50: AH rm = 2 AH iamls ‘leM ~ 5A“ bond; fun-«l . : [acs—o) +a<s=o> + [(0:0)] - [.2 (5—0) + I(S¢°)3 :Lamusy 30101) f IH‘ISU - E -? (2025) + [Noam Answer: ~ 6 points b Which C-O bond is more stable, the one in CH3OH or in CHQO? Explain why. :fii‘ “KC—'6 H I C\ 4 H l Answer: CH3.0 ’ Chum 4 points 7 Organic molecules 6. Drawr the Lewis structure for this molecule. (8 points) (CH3l2CH(CH2)2CF3 H H ,2, 2' 2* 'r' \ O. H:C~IC‘*C*C,-F: y H “C I I II I N 4 : o :4 H l ' b Write the molecular formula for this molecule. (8 points) 0 O Col-H3 (9 HO OH CH C Draw the line structure for the following molecule: (8 points) 05H5OH WOH ‘V ...
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This note was uploaded on 06/08/2008 for the course CHEM 1A taught by Professor Tobias during the Winter '01 term at UC Irvine.

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midterm2_answer - VQVS'JDA A 1 Naming compounds Provide the...

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