Final Fall06 - 'Version2 FINA" Fall 2006 CHEM 3369...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 'Version2 . FINA"? .- ___ Fall 2006 CHEM 3369 December 13-.2006- 5:00 — 8:00 pm This exam contains 40 questions (you showed upfor‘ thefinat = a chance to earn extra 5 pt: : happy holidays). swer sheet corresponding to the best answer for each of following questions. . flee M rr-Jrrr N = 6.022 x 1033; Char f a sige eecron = 1.602 F = 96,485 Cf'mol e— C) 1 I. In iodometrictitratjons «— I izing aria yte lS titrated with iodine A . an oxidizing analyte is titrated with iodide I‘ a reducing analyte is titrated with iodine L/ ; a reducing analyte is titrated with iodide E ,1? a reducing analer is titrated with iodate —"‘>@What is the pOH of the solution that results when 10.0 mL of 0.0835 M HC] and 10.0 mL of 0.0850 M NaOH are mixed? \_/ \J. A 10.88 _ . . .07 ' i 1 C. 7.00 D. 12.93 J E. 3.12 5.0 A; For the reaction NH4HS(5) H- NH3(gj + H28(g) KP = 5.6 x 102 @ 900 K. Starting with pure NH4HS, the equilibrium pressure of 1-128 is 280 atm am: If u j C. 24 atm {A \ D. 12 atm "" E. 1.8 x10"3 atm Chemists define the electrode at which 051315111911 occurs as I AL“ the cathode I the anode _, ._ 2"“. ' .' I t . C. the reference electrode = D. the ion-selective electrode E. the indicator electrode e if“? >1: 5. Calculate E for the following cell at 250C (aqueous solution). ” "T Pt 1 Sn2+ro40 M), Sn4+roro M) It Sn4+(0.030 M),- Sn2+roor0 M) 1 Pt 0. tic-i » O- t to — -13°1 ‘ my“ / A. 0.214V O 3fl1+ -3 S.-,- + A - 1 EDGE E B. 0.]82V k 4 C. 0.118 V f: - Q , i” w?) . If. durum“) [-1 fix. “’301 D 0.032V ‘11 ET/ E. 0V ® The equilibrium stant, Kp,for the reaction 2Hg0(s) H ZHgU) +.02(g) is 1.2): 10—30. Calculate KP for ‘ the reaction H i) + 1:202:13) H W 9.1)11014 l .- . . 8.3x1029 "‘ 1/1 CA) C. 1.1x10-15 02 ' D. 4.11:10‘15 " 13. 4.2x1029 l. _ @ Given: ” 302(3) 9 02(3) + SE5) K:2.5x10‘53 1 (l ‘ 303(g) a mom) + 802(g) K:4.0 x1043 “30?: é‘ '5 0‘ "iv-30>; Calculate Kfor the reaction 28(5) + 302(g) 6—)2303fg). A 1.6:: 1040 A ' B. 10x1065 fxlé i C 1 1x10130 - D 16x108‘0 E. 1.0x10“33 K8. Consider the reaction 2302(3) + 02(3) 9 2803 (g). If, initially, [803] = 3.2 mM and at equilibrium [803] = 3.0 mM, calculate the W '92- 3!?" ' A. 1.8mM a _ VB? 3.3 mM 2—0 T/E’.’ 3.0mM l o. 1.5 mM [ Aer 0.80 mM Chemists define the electrode at which reduction occurs as i Q the cathode r B. the anode ' . C. the reference electrode D. E. the ion-selective electrode the indicator electrode A i 9! Calculate the pH of 0.020 M Ba(OH)2(aq). C0 . 6203 C0 H11 urea(pr = 13.90) ammonia (pr : 4.75) morphine (pr = 5.79) pyridine (131% = 8.75) A B c D. methylamine (pr = 3.44) ATZ'i By how many volts will the potential of a. M32+ ion-sensitive electrode change if the electrode is rem0ved from ' 5.00x10-4 M Mng and placed in 5.00x10‘3 M MgClg? A. + 0.0592 V' E B. + 0.0296 V c. + 0.1183 v I . . — 2.360 V i no change will be detected If 13". If the Solubility of calcium fluoride in water is 2.2 x 10—4 M, the Ksp of calcium fluoride is flame-4. Cap: +HLC) 4» H1: 4- C2310 " I i j + 14. The pH of'a solution that is 0.12 M C5H5 NHZMQJ (Kb = 4.3 "x 10—10)a'nd 0.018 M C6H5NH3 (aq) is I ’1 .i( J A. " r,. 855 Kb~ ~ieymt tr: Elirhveflgmltegt_-- 10.19 P 7‘ EC; Hgmgl? J m. ¥ I I. ._ r] I —\J l i!— . . '— A I .4 C9050)“; '* 1‘42. (W; O to H 5 2 Jr ‘ {cu ‘] 0-4900“ 000 r 10.1? C9 The cell diagram for the reaction in w iéhvhlxdrogen gasaq) is I 1' . Pt r Cu2+(aq) [H2(g) || H+(aq) I Pt PtlCu2+Ca®|H+£aquH2€3NPL (91+ ‘5 ‘9“3 rtéucw (311(5) I Cu2+(aq) || H+(aq)lH2(g) | Pt C LL? 4 i ~- _ ,-\, 1,“ Pt I H2(g) EH+(aq)IICu2+(aq)|Cu(s) J . ‘ .r I ( I Cuts)Icu2+<aq)lr02<g)1H2cgJIPt iii.) a; in wt- “ Wider “- '5 ._. i l “'1 £1. /E/ 10-8 KG J ’ ’ . _, 7 fr [ollj/ \0 r175« V 17'. If the pH of 0.20 M CH3 NI-Ig(aq) is I 1.93, the percentage of base ionized is \é A. The Kb is required in order to do the calculation. J 5.9 x 104% ’1 ‘. 4.3% GHQ) N H; 4 HQ (.1: «fr-“'4.- @0370} H3 ’17 OH H B c . 43% 85% e“- - ,5), +' 1?. The species capable of oxidizing V2+ without oxidizing Br‘ is {lmhfd ’C ‘ 0.4 4*f v ,Ban2+ V “‘3 \j 4 17.5, AGO for the reaction (P d— ; :— K/L i 3Cu(s) + 2NOj‘(aq) + 8H+(aq) -* 3Cu2+(aq)) +2NO(g) + 4H20(l') \J E at 298 K is —359.2 kJ-moi‘ 1. The standard voltage obtainable from a cell based on this reaction is . 0.62 9. p {g -—e :2 .u 2- - rt or“ A 0.933 beg ~ M 0 J git—a flu.— f” 1.24V . 19f - a ’2: , .— 136" ' 5‘55? - Z ka/mefi “Viz; 332V p_____. fid‘gH 4; + hear { 0 we. {2 ll CHM-ESQ." S. \ How many milliliters of 0.0250 M KOH are required to neutralize 5.00 mL of 0.108 HBr? M E: F. J.— 6‘ r“; A. 11.20mL Mv“ B. 43.2mL D fig 332% auzsom x = ammo-woo) 2.3lmL x: Zi’éyflL 2 The pOH at the half—stoiehiometric poi nt for the titration of 0.22 M aqueous chloroaeetic acid (Ka =. 1.4 x 10—3) 1 with 0.10 M KOH(ag) is A. 3.51 J E . 11.15 t— 1.74 g D. 1.92 (I? 2.85 22i- F What is the H of the solution prepared by mixing 25.0 mL of 00040 M HQ with 60.0 mL of 0,025 NaC]? I. J;— I . 7.00 ' ' l e 5 VB? 2.93 _ _ I 1 c. 8.44 . I _ l . 6.14 . I c) h ._ I I I + @ Then the reaction 2Na(s) + 2141200) —5 2NaOH(aq) + Hng) is as l ._. A. NaOH N0“ 4? Men 4. 1.3 B. H20 0 C-- H2: C5). Na F f 4. none of the above l 'I'H 2. . What Species is oxidized in the following reaction? _—.._ I +I— ‘2. 20(5) + airflow) '+ 12H+(aq) 4’ 203%an + n2+(oq) + GHQOU) A Cr Cr —-3 Cf“ + 3-;- E. MnOg C. Cr3+ D. W“ E. H20 . What is the cathode reaction forth c It resented by the celldiagram thatfollows? Ptis) I Hzrg) r HCl(aq) 11 143202931 HgU) Cafioode ' Reducex /A’- - 142(3) % 2H+(aq) + 26‘ /B'.’ Pt(s) :—» Pt2+(aq) + 2c— £2 2 S + ,- 'Hs2CI2(s) + 2c- -—» ZHgU) +_ 2Ci—(aq) ,E.’ ZHCItaq) + Ze‘ —a- H2(g) + 2c1nraq) Moiarity is a designation of concentration expressing M I'“'——‘-'—-. C] I the number of moles of substance per kilogram of solvent the number of moles of substance per kilogram of total solution the number of moles of substance per liter of total solution the number of moles of substance per liter of solvent 27. The reaction mixture of 2A + QB 9 3C + D is anal i [D] : 2. IfK: 0.5, what is the stamflf—thlsreaction? equilibrium has been reached 2- X Z) - . -_h—-———______‘_ d- ! the reaction needs to proceed to the n ght «a — |g 5 fl the reaction needs to proceed to theleft 4 .X E) ‘2' ° it is exothermic none of the above is correct a What does the use of LeChateliers' principle enable us to predict about the following reaction at equilibrium r .r" ' . . r) _ 3+ 9 _ 2_ .1. when mg: the solut1on [8 decreased. BrOg + 2Cr + 4H20 Br + CrgO—i + 8H A.‘ the reaction will shift to the left fl \Zj :B: there will be no change - the reaction will shift to the right D. there is riot enough information given to predict E. none of the above answers are correct i F. i | i i 25%. How many milliliters of 0.123 M HCI should be add pr = 3.364) to give a pH of 10.52? i 3-2 ed to 213 mL. of 0.00666 M ethylarnine (CH3CH2NHg, has"; /_ H S16 (07 ' / - - - ' 8L8 K j H- $317 ‘ ' I: 3 m . 5w g_01 )6 1;'[ JD uoymnueouoo uog wnyumpfiq e seq 12m 1319:0995 JO‘Hd 910 5! my“ 140 . _ - . _: (LEG = 9de E01H '3 1 (SW = BXd) HOOQEHQ 5 (zrz = ['3de [email protected] ':> ( (975 = yd) :IH ‘8 -_ ‘0 13$) 4-?” Q m 'suounros [[B 1001 gums aq1ngd 9m ‘spgoe am 02 songs I “III—————. I ng asaqfigq 910 mm uounlos w m0 '3 89MB Buymouo; 910310 suo [{3qu @ 'i -I 0:02? i 7.: j w 093'0 a i; . W S3171) 'Cl ! oo; a . . . “F? . ' a to“ 03 w SLZ‘O ! . 1 W SZZ'O i . 4‘ 1 H I z “a? E H“? H? W'EEE'O ‘v l D . _ 'l w I. a mnpqmnba 113 30 [IDIJEJJEIQOUOD 9L1} 3120131123 w J: 0930 syeyuomum g0 uogenuaaum 9m ‘wnqumnbe 1MIEHN H (3)3519 + (8)310 :Lunuqmnba ssqoea; DUB 513129.: ammwdwm 1021193113 [9599A 11011029.: 2 u! 3}] w 0090 pue ZN w 3‘30 _.}0 Euglsysuoa smlxgw V "9% r d. f . v00 1 1'5: ' 11700 3? 90E €51 1 90E . ) 9501 i {'5 Air gap/7 gig? 0%; d = (ZO'OI 8170 — (EDD?) SS'I + (300:) 96'@ g 989 . LI'L ' _ 56/017 <7. - M: E 00‘; 9 .. j 0 0] 0919 I - A, I my,” flay/W {340:} 0.7 H _ . m i . c7 ’ __ flesh” ‘(bv)z(HO)eaw8_0rxowo Hd sumwtnelea 'IEE 9'6?— 4‘ 055?? cf: “3 I ' 9 a 9 ’Cl 17 (I? E ’8 - g a V I 603mm 0 mm” 9L” U! 919 99mm; Jueouzufizs xuew m0 -. Z l 7-9.1 ' l . .. 55% + a”; - [Lle amob '1- (Ll—a -' ' 0.30 7336. The solubility ongCl (asp = 1.6 x10‘10}1n 0.50 M NaCl is M r- = ' 1.3 x10‘5M .10 9* ___ :— A B. 8.0x10‘10M LG” {0 5 (2-5 X C. 3.5 x10‘10 M _ .7: D. 1.6x10-10M fgxp’o 4% E. 3.2x10“10M ' 5-5-x i f Calculate the ionic strength of the aqueous solution containing 0.020 M of CuClg, 0.030 M of NaN03, and 0.040 M of AlCl3. is the K3 for the acid? A. 1.1:i10*6 % CH}? 4‘47 X10 (3". 4.5x10-7 E c. 8.9x10-7 Flip;- 2&3 KL D. 1.0 x 10-7 M E. need more information to tell £354. A mixture containing only A1203 (PW 101.96) and Fe203 {159.69} weighs 2.019 g. When heated under a 3' stream of hydrogen, the A1203 is unchanged, but Fe203 is converted to metallic Fe plus H20(g). If a residue ' weighs 1.529 g, what is the wt% of Fe203 in the original mixture? i) A. 40.4 wt% {’3‘ i 59.6 wt% L, i 20.2 wt% D. 80.8 wt% i_ E. 63.8 wt% : Q 1“ 401. How many moles of AI(OH)3 (KSP = 1.0x10—33) will dissolve in a 250-mL solution in which the pH is fixed at 5.121 - [l' —e l: “B 1-1x10“7 EH]? 7‘58 NO X . . d L K _,_..-~"""_""_' D.52x10—7 Emile ‘93 (8’15 '0 L__ AHOHJU “’9 ql "'r 0H2» ...
View Full Document

This note was uploaded on 01/23/2011 for the course CHEM 3369 taught by Professor Roman during the Spring '09 term at University of Houston.

Page1 / 8

Final Fall06 - 'Version2 FINA" Fall 2006 CHEM 3369...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online