CHM139H1_09SPRING1_719

CHM139H1_09SPRING1_719 - Do wn lo ad er ID : 58 70 Do wn lo...

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Unformatted text preview: Do wn lo ad er ID : 58 70 Do wn lo ad er ID : 58 70 ID wn Do er ad lo : 58 70 Dow nlo ade r ID: 587 0 PART A: Multiple Choice Questions. Total marks = 36 (3 marks each). 1. In the reaction: 2A+B ~ C+3D The initial rate of chan e of A is measured to What is the initial rate of reaction? Do wn lo ad er ID : 58 70 - . / om Do (a) -8.2 x 10-5 Mls (d) +8.2 x 10-5 Mls Te st ID (e) +1.6 x 10-4 Mls 42 Test ID: 1142 2. You are in the laboratory studying the reaction 2A + B ~ D and have set up three experiments. The following table shows the data you have obtained: st ID : 11 Te ID : 11 42 Te st wn l What is the!]!e law forJhis reaction? de nt bu dd oa de (1) (2) (3) 3.0 x 10-3 6.0 x 10-3 3.0 x 10-3 oader Downl ID: 5870 3.0 X 10-3 6.0 x 10-3 6.0 x 10-3 r ID : y. c 58 70 Expt # initial [A] (M) initial [B) (M) initial rate of change of [D] (Mls) 5.6 x 10-10 2.2 x 10-9 1.1 x 10-9 ID lo ad er : 58 70 Do wn Do (a) rate (b) rate vcJrate Te st ID : 11 42 = k[A] wn (b) -4.1 : 11 42 lo x 10-5 Mls ~4.1 X 10-5 Mls ad er ID : 58 70 = k[B] = k[A][B] = k[A]2[B] / 58 Do w 70 .s tu on to Te st (e) rate = k[A][B]2 ID (d) rate (a) The plot of [A] as a function of time is a straight line if the reaction is l" order in A. Te st ID : 11 42 (b) Ifthe concentration of A is doubled, the initial rate of reaction should quadruple (increase by a factor of 4) if the reaction is l" order in A. Te st ID : 11 42 Mrhe half life of A should not depend on the concentration of A if the reaction is 1st order in A. ---- V· - (d) The half life of A should be double if the concentration of A is doubled if the reaction is 1st order in A. Tes t ID: 114 2 (e) If the reaction rate doubles after addition of a catalyst, the reaction is 1st order in A. er ID : 58 70 load Down er ID: 5870 Oxdia @ http://www.oxdia.com est ID: 1142 This test is copyrighted by the uploader and/or course instructor. Download er ID: 5870 Page 2 of8 Downloader id is shown and also encrypted throughout the document. Unauthorized reproduction/distribution is strictly prohibited. Solution (if any) is NOT audited, so use at your discretion. nl oa de r Which of the following statements @or ut or a:fu:st order reaction in A: ID : 3. You are studying the net reaction 2A ~ B + : cC/" 11 42 Te st ID : 11 42 r ID : 70 58 Tes t ID: 114 2 Do wn lo ad Down load er ID: 5870 Test ID: 1142 4. The activation energy for the decomposition of protein A is 98.0 kJ/mol. How will the rate constant for the decomposition of protein A at.@omparetothe rate constant at 298K? (a) The rate constant will increase by a factor of2 (rate constant will double). (b) The rate constant will increase by a factor of 32. vcJThe rate constant will increase by a factor C- fJ57. (d) The rate constant will remain approximately unchanged. (e) The A-factor must be known to determine the change in rate constant. Down load er ID: 5870 Do wn lo ad er ID : 58 70 11 4 2 42 11 : ID Test ID: 1142 st Te Te s 2NO(g) + 2H2(g) --. N2(g) + 2H20 (g) : The following 3-step mechanism has been suggested: Do wn lo ad er ID 58 70 er : bu N202(g) Do wn lo ad er ID : 1) oa d 2NO(g) +=± --. dd (fast, reversible) (slow) Do wn lo ad er ID : 58 70 ID Do wn l load Down er ID: 5870 or on t ID: Tes 114 2 ut 6. Which of the following statements (a) At equilibrium the reaction stops. Ee~ 1(, C (b) At equilibrium the rate constants for the forward and reverse reactions are equal. ~ # At equilibrium Do wn lo ad er ID : 58 70 the '!!.tes ofthe forward and reverse reactions a~ Do wn lo ad er ID : 58 70 (d) At equilibrium the rates of the forward and reverse reactions are zero. (e) Equilibrium concentrations Downloader ID: 5870 Dow nlo ade r ID: 587 0 ~ o; of products and reactants are not affected by temperature. Do ~ Oxdia @ http://www.oxdia.com Do wn lo ad er ID : 58 70 This test is copyrighted by the uploader and/or course instructor. Downloader id is shown and also encrypted throughout the document. Unauthorized reproduction/distribution is strictly prohibited. Solution (if any) is NOT audited, so use at your discretion. wn 'k1 Page 3 of8 lo ad k.OJV] ~[kk(h.] Downloader ID: 5870 er ID ~ : 58 What e¥erimental rate law is predicted by this mechanism? (a) Rate = k[NOf[H2]2 (b) Rate = k[[NOf ~ (c) Rate = k[H2][N202] (d) Rate = k[H2][NO] ¥JRate = k[Hz][NOf de 3) N20(g) + H2 (g) nt 58 70 2) H2(g) + N202(g) ----+ H20(g) + N20(g) H20(g) + N2 (g) 11 4 2 y. c (fast) 58 70 5. For the aqueous reaction om E.. t ID : .s tu ID = kO-\~1 [f..6-0.).3 : Downl oader ID: 5870 to Te st ~~)JOJ~=~[AJ~02.1 70 Dow nlo ade r ID: 587 0 load Down er ID: 5870 Downlo ader ID: 5870 58 70 ID : 7. The esterification reaction of acetic acid (CH3COOH) and ethanol (C2HSOH) is given by the reaction below: ad lo Do wn Test ID: 1142 er 587 Dow nlo ade r ID: 0 C2HsOH(aq) + CH3COOH(aq) ~ CH3COOC2H5(aq) + H20(l) When 1.00 mol of ethanol was mixed with 2.00 mol of acid in a 1.00 L flask, 0.86 mol of ester was formed at room temperature. What is the value of the equilibrium constant, Kc? (a) 0.43 (b) 2.3 (c) 4.6 Test ID: 1142 o.J~UH(" 1·00 M } 1- CthtOOtt(~) t: ) CH3 rooc.~(v« t~~ -e)I. !l.OO M ~.4 Test ID: 1142 -x. -'I.... (e) 110 11 0,'4at 298 f ·00- "J- I,,4- 42 om ID : 8. The equilibrium constant for the hydrolysis of hypobromous acid (HBrO) is 2.3 x 10-9 K. What is the pH of a (formally) 0.20 M solution of hypobromous acid? Te y. c 58 70 (a) 3.26 (b) 4.32 c : ID oa de r wn l Do H~ 1- \-6.0 e:==' r-bO"" Do wn lo ad er ID : 58 70 +. st ~rOTe st ID : 11 42 ~4.67 (d) 5.36 (e) 9.34 de nt bu dd J~ O.2f} C: -J- E~ ..,:;- Q,.}..\)-'1- Tes t ID: 114 2 .s tu CO(g) + Fe3<t(S) ~ st ID : 11 42 CO2(g) + 3FeO(s) Te st ID : Te in a sealed vessel. Which of the following statements is incorrect? to 11 42 9. Consider an equilib~um mixture: Dow nlo ade r ID: 587 0 on ut or (b) Adding solid FeO will nave the same effect on the total pressure as adding solid 04. / ~ i\)o1\tlw (, _ Y3 Test ID: 1142 in an increased partial pressure (e) Changing the temperature will result in a change in total pressure. Test ID : 11 42 ID: 1142 Te st Te st ID : 11 42 Te st ID : 11 42 Oxdia @ http://www.oxdia.com This test is copyrighted by the uploader and/or course instructor. Downloader id is shown and also encrypted throughout the document. -. Unauthorized reproduction/distribution is strictly prohibited. Solution (if any) is NOT audited, so use at your discretion. . -------=---.-------- ----------- - - Do w Page 4 of8 nl oa (d) Adding M'Removing --CO gas will result Dow nlo ade r ID: 587 0 solid Fe304 will result in t e formation of C02 gas. - x; of C~. de r ID : 58 70 (a) Adding inert Argon gas will not change the partial pressure of co. /' Dow nlo ade r ID: Do wn lo ad 587 0 Down load er ID: 5870 t ID: Tes 114 2 Te st ID : 11 42 ID er : 58 70 Test ID: 1142 Download er ID: 5870 Test ID: 1142 Do wn lo ad er ID : 58 70 10. What is the approximate value of the equilibrium constant for the neutralization of chloroacetic acid with sodium hydroxide? The K, for chloroacetic acid is 1.4 x 10-3 and the reaction of interest is Down load er ID: 5870 ID Do wn lo CICH2COOH(aq) 70 + NaOH(aq) ~ H20(!) ..f-. + NaCICH2COO(aq) Downloader ID: 5870 Te st ad er ID : : 58 11 70 42 Do wn lo ad er : ID 58 (a) 1.4 (b) 7.1 ~~~~: x x 1010-10 ID Te st : 11 42 17 D \::'\ ~.\-k.toOH O\"r ~ ')c. t-k.O 1- kt.t\ ttb_too -- 11. What is the pH of a solutionmade 11 42 ml of 0.060 (a) 1.82 (b) 2.52 (c) 7.00 (d) 11.48 from titrating lOO ml ID : 11 42 st M HCI? Oft ~ ,~ 58 70 f) Te st ID : 11 42 O,~M)( fOOVl\L ') .~ Ir;; L4AMO' '-- Te co Te st . . m ID : Te st ID : 11 42 ud dy . ID : lo ad er tb Do wn 14.0 ID lo wn Do er ad : 58 70 10.0 8.0 tu de n 12.0 pH 6.0 4.0 2.0 Do wn lo ad er ID : 58 70 11 42 ID : : ID lo er ad 58 70 Do wn o. s Te st Te st ID : 11 42 on t or ut (a) 5.0 ~ 1.0 x x x x 10-4 mol 10-3 mol 10-3 mol 10-3 mol B. Te st ID : 11 42 Te st ID : 11 42 (c) 2.0 (d) 2.5 114 Tes t ID: 2 (e) There is not enough information to determine the answer. Do Approximately how-many-~f NaOH have been added? Oxdia @ http://www.oxdia.com This test is copyrighted by the uploader and/or course instructor. Downlo ader ID: 5870 Downloader id is shown and also encrypted throughout the document. Test ID: 1142 " " ----- Unauthorized reproduction/distribution is strictly prohibited. Solution (if any) is NOT audited, so use at your discretion. " . " . wn A" are present in solution after 25 ml ofthe 0.100 M Downloader ID: 5870 Page 5 of8 lo ad hw,t.O\ it- tJl\- ~ ~ (J ..- er ID 5.0 10.0 15.0 20.0 25.0 30.0,-® Volume f-o::rOOMl'lla H, mL A- : 58 70 " 2 114 ~~I (I(Lt 17 \O~ ). (.0 ~to ''t 1- (e) 1.4 Test ID: 1142 x 10 Q,Q\-k(tx)t1 .•. ij(c);:! aD '\1 It CJ~COO- 0/.1 •.. M ~ ~OO ~1 '~IJMl' "3 Test ID: 1142 E U·o ~ (O.Olv)(.200cML) 01 ~--1 12(,41\~\. Te st ID : 11 42 prA-t::_.2 If) 1)1-( ~p~" 2.- 3 (MIMQl 4T- OH~ + 1~· \JIJ~--L. \ 00 Test ID: 1142 ~ 12.18 '8(Mtt\e\ ~ 12. The graph below shows a titration curve for the diproti~~i}(H2A Downloader ID: 5870 wiir£~Ot Te st ID : 11 42 er ID: 5870 Download ID Te st : 11 42 Do wn lo ad er ID : 58 70 Test ID: 1142 PART B: Short Name: 4 ••~ •••• n.. _4-: _ ID : 11 42 114 Tes t ID: 2 1. (6 marks) An equilibrium mixture 0 ~, ~ and S03 gases is maintained in a 2.05-L flask at a temperature at which K, = 35.5 for the following reaction: 2S02(g) ID: 1142 + 02(g) Test ==" (iS03(g) Do wn lo ad er ID : 58 70 (a) Write the equilibrium constant expression for this reaction. (b) If the number of moles ofS02 and - in the flask at equilibrium are equal, how S03 ~ many ~ of 02 are present? 11 42 Te st ID : 11 42 Te 587 Dow nlo ade r ID: 0 -J&t ~~ %V\~Ort : ~.......o\~"""". _ _ frolt\fXl'-T [\) Do wn l 1 ke- [i!~] ~ GI~; lk ~ ~.:l.. 42 h_ Downloader ID: 5870 Ot-l«V\~ vf-~(h ~d ~~ f},Yl ~lAC\\ .s tu I, ut or ~¥\ ". ~ / ~ ~ -'- -==- 35.S- [O~J ~ Download D.O~1. er ID: 5870 M \10lu~ =- .2, os;- L M =-IMI) \ "=i ~o"· V o .O.2&1J1=~ -::: ~ .;L.OS-L at O.D5=ta-£!nD) ~t\\.l\h I/Hl.\~ . Pt- o~ (J.~p~~nt Page 6 of8 Do wn lo ad er ID : 58 70 Oxdia @ http://www.oxdia.com Downloader ID: 5870 This test is copyrighted by the uploader and/or course instructor. . Downloader id is shown and also encrypted throughout the document. Dow nlo ade r ID: 587 0 Do w x[O~J [O~J. " . Unauthorized reproduction/distribution is strictly prohibited. Solution (if any) is NOT audited, so use at your discretion. . nl oa .----- de r ID : ~~V\,\roV"'-TV' I GroJlo~J 58 -J. on "-\ [~.l-1 1)03]. ~ .c., bl\r-t- oJ we. cnow to Te st . , l,c.:::' Doo].z. :::'~. ;- 70 ..kt- ~~ ~:x . ID ~"~Ot1 -oo~~~~ ~ : 11 ~~ ~~ IWt~{Ia~~ "t «tl'\~\vrt\J.~ ~ v1A~ Vl ~\ Peco.~{L de nt bu dd ~ 8,9. Y-=- oa de r ID ID : 11 42 Te st y. c ~W~~ Do wn lo ad er : ID 58 d~ 58 70 70 . ~lAoJ, ikwVOh.lWil . om st ID : Te st Tes ID 2 114 t ID: Tes : 58 70 Do wn lo ad er Dow nlo ade r ID: 587 0 Nam e:_-:=:=~=--:-::-:-::-_------:,-------:---::::-, 2. (12 marks) You would like to make a buffer of pH 9.00 and decide to use ammonia (NH3, K, = 1.8 x 10-5) and ammonium chloride salt (N&CI). (a) If you start with 1.0L of 0.500 M NB3, how many moles of ammonium chloride are necessary to make a buffer of pH 9.00? Te st ID : 11 42 NI'1"\O ~ NH't:tl+C.\-((l~" Down load er ID: 5870 ~ \~ouJ" .~ r tJMa ~f-b wn Do lo ad er ID : 58 70 1> It~ grab I-kD ;;z J.R;t I t \ etf -7 pH=- pK~ + \o~ ~~) =-j)1Xl =f::'v Tes t ID: 114 2 . ::- , ,0)(\0 Iq.& x IV-S, Q,b X 10-10 + NH<t" + X ~\, (OS/lVM){ 11 42 ID : 1.0.1-) ()\i(/.A~or-Wli4--t-=. x.. X -= OSOO~V' (QueJ Te st ID M pl\~::..-~~ (S.b X 10-1°) ~ q ,.!Lf7 q.OO~.:s~ q l~ ~) VJt ~O()J~~1::o.DS~=-[~tio] /)JH'\'tJ 58 70 : 11 42 co Downl oader ID: 5870 Te st m L~<tJ ~ 0 . .% Do wn lo ad er ID : 58 70 100/~J\:: ID : v·:ib ~ 0, ~LM..ot of tJrt~~\o.rt ~~~~ ud dy . 0'::0: I~=-O.~moq er I.l~\d]) -o.2S- [~ . Do wn tu de n Tes tb t ID: 114 2 (b) 20 ml of l.OM HCI is added to the buffer made in part (a). Calculate the new pH. lo ad o. s Te st ID : 11 42 on t or Test ID: 1142 Do er ID : 58 70 ID Te st : 11 42 Tes t ID: 114 2 Oxdia @ http://www.oxdia.com This test is copyrighted by the uploader and/or course instructor. Test ID: 1142 Downloader id is shown and also encrypted throughout the document. Unauthorized reproduction/distribution is strictly prohibited. Do wn lo ad er ID : 58 70 Solution (if any) is NOT audited, so use at your discretion. Test ID: 1142 Do wn lo ad (c) Does the buffer of part (a) better resist pH change due to a~ed explain your reasoning. ut 587 nlo ade r ID: 0 Dow Page 7 of8 wn lo acid or base? Briefly ad er ID : 58 70 Do wn lo ad er ID : 58 70 Test ID: 1142 Dow nlo ade r ID: 587 0 ID Do wn lo ad er : 58 70 I~ Te st ID : 11 42 Name: 3. (12 mar ) Consider the following reaction energy diagram for the reaction 2A(g) + B(g) o() C(g) + D(g) ---~~--------~-------- Download er ID: 5870 Trmci{Ol'1 ~1R-b. Downloader ID: 5870 i 11 42 Test ID: 1142 ~ 70 : Do wn lo ad er Reaction Progress ud lo tb Do \ wn (a) How many steps are there in the reaction mechanism? (b) Which step is the slow step for this reaction? dy . ad er ID : 58 70 ID 58 ~ I 42 (c) Indicate the point(s) on the diagram which correspond to transition state(s). 0 587 Dow nlo r ID: ade ud en 1..QY\t! 11 Dow nlo ade r ID: 587 0 I co j Te st m I\4.JnJIl : ID lo ad er 58 70 ID : t01i,t...J. (d) Label the activation energy for forward reaction on the diagram. Do wn .s t to or ut Test ID: 1142 (t) lfyou increase the temperature, does the value of the equilibrium constant increase, decrease or remain the same for this reaction? Briefly explain your reasoning. ~ ~ti\()\ I-S ~~\t \~~ 1hln ~\Qt--~ +rot- *~ I es ~\ ~y ut-M p~~cls. L'5 V'tR~to,Yl\. ~fuJt:1 [K~ord\~ -\Qw~~~ Downloa der ID: 5870 Do wn In Jt -m fr\v\t\f\~' 1V\~Sl~ LMQ\~ -fuVD(f.J f~~V.L+Sc' ~fQ.to~ 1142 Test ID: i1kt~tA-(\lh'\,l.1.IJ 00_ ~(l\~ Download er ID: 5870 UJII\ \vt(){m~. Page 8 of8 Oxdia @ http://www.oxdia.com This test is copyrighted by the uploader and/or course instructor. Downloader id is shown and also encrypted throughout the document. Unauthorized reproduction/distribution is strictly prohibited. Solution (if any) is NOT audited, so use at your discretion. lo ad 1142 Test ID: er ID : 58 Test ID: 1142 on 70 (e) You have discovered a catalyst for this reaction. On the diagram, sketch a new energy curve for a catalyzed reaction. Briefly explain (four sentences or fewer) the most important features of the catalyzed reaction curve. st ID : 114 2 Tes t ID: Te Te st ID : 42 11 ...
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