General Chemistry II
General Chemistry II C 152
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This 6 page Study Guide was uploaded by Maxwell Ward on Tuesday October 20, 2015. The Study Guide belongs to C 152 at South Carolina State University taught by Staff in Fall. Since its upload, it has received 121 views. For similar materials see /class/225411/c-152-south-carolina-state-university in Chemistry at South Carolina State University.
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Date Created: 10/20/15
smh Carnlinz sum University Name Department nf Enlngjcal and Physical Sciences General Chemistry 11 c152 Tm Ch 15 Date Show all work 1 Whmh cme fulluwmgxs akmen quanqu a Euthale b mtanal snag eemagy a rateufreammn e entxupy Z ZA 3B eF ZG MA b MB E Am d MG MA At KAI At ZAL ZAL that cmlld mease the rate um reamum x luwenng Lhatemperature 11 mm mum m mueasmg mammal cuncentxanun ufB a b cm dlzndll ellzndm 4 mm cme fulluwmgreacuuns vmuld be Expectedtu bathe sluwesm a Ag q Cl a1 eAgCKs a PM Croi sq gt PbCrOs b on sq 11200 e H39aq CNaq gtHCNaq E CHo 201 gtCQ 2H20 a mum explusmns that mm m gm elevaturs b c A chunk uflmn takes munths m m cumpletely whxle m wuul Wm rust m days a e The Grand Canyun ms created by mssuluuun by Water aver mllmns ufyears a Thegasrphasereacuun zNozH gtN2Ho razekwo2w Whatnhzngem ta 5 expecceav a decreaseby3 b xncreasebyK4 e mysszme c nmasebyzz a decreasebylZ the fulluwmg datafurthe NH NO gtNz szo reamun Tnal N N 7 Gwen H4 01 Rate 1 IUlEIM uuzuM IUZEIMS 2 arms uuzu um um nuns 3 I I1 and the rate 12w fur the reamun Shaw the wurk 8 Determine the ratelaw expression for the reaction below at the temperature at which the tabulated initial rate data were obtained A 2B 3C Products 39 Initial A Initial B Initial C Initial Rage of Loss of A 1 010M 020M 010M 40 x 10392Momin391 2 040M 020M 010M 40 x 10392Momin391 3 020M 020M 025 M 10 x 10391Momin391 4 020M 040M 010M 16 x 10391Momin391 9 Evaluate the speci c rate constant for this reaction at 800 C The ratelaw expression is rate kNO2H2 Choose the closest answer 2NOg 2H2g N2g 2HZOg Initial NO Initial H2 Initial Rate of Reaction M39s39l 1 00010M 00060M 79 x 10397 2 00040M 00060M 13 x 10395 3 00040M 00030M 64 x 10396 10 The oxidation of NO by 03 is rst order in each of the reactants and its rate constant is 15 x 107 M1 s391 If the concentrations of NO and 03 are each 50 x 10397 M what is the rate of oxidation of NO in M39s39l NO 03 9 products 11 The decomposition of dimethylether at 504 C is rst order with a halflife of 1570 seconds What fraction of an initial amount of dimethylether remains after 4710 seconds 12 The gas phase reaction below obeys the ratelaw expression rate kSOzClz At 593 K the speci c rate constant is 22 x 10395 s39l A 20g sample of SOzClz is introduced into a closed 40L container SOzClz SO2 C12 How much time must pass in order to reduce the amount of SOzClz present to 18 grams 13 The gas phase reaction below obeys the ratelaw expression rate kPC15 At 400 K the speci c rate constant is 00371 min39l How many hours are required to reduce a sample of PC15 to 10 o of its original amount PC15 PCl3 C1 14 At 300 K the reaction below obeys the rate law rate kNOCl2 where k 28 x 10395 M1 s391 2NOC1 2N0 C12 Suppose 10 mole of NOCl is introduced into a 20liter container at 300 K How much NOCl will remain after 30 minutes 15 Which statement is incorrect The reaction rate for a zeroorder reaction is independent of concentrations The speci c rate constant for a secondorder reaction is independent of temperature The halflife for a firstorder reaction is independent of initial concentrations The rate law expression relates rate and concentration The integrated rate equation relates time and concentration 0999 16 Which of the following statements concerning graphical methods for determining reaction order is false For a firstorder reaction the plot of In A vs time gives a straight line For a firstorder reaction the slope of the straightline graph equals ak For a secondorder reaction the plot of A2 vs time gives a straight line For a firstorder reaction the intercept of the straightline graph equals ln A0 For a zeroorder reaction the plot of A vs time gives a straight line 0999 17 A reaction has an activation energy of 40 Id and an overall energy change of reaction of 100 kJ In each of the following potential energy diagrams the horizontal axis is the reaction coordinate and the vertical axis is potential energy in kJ Which potential energy diagram best describes this reaction W 40 540 40 100 100 100 100 V a b c d e 18 Given the following potential energy diagram for the onestep reaction X Y gt Z R The arrow quotdquot represents the Potential energv Reaction coordinate 19 A reaction mechanism will usually be a the only possible explanation for the reaction b difficult to verify experimentally c proven experimentally to be the balanced chemical equation d obvious from a consideration of the balanced chemical equation 6 obvious from a consideration of the reaction rate data 20 Consider the following proposed mechanism If this mechanism for the overall reaction were correct and if k1 were much less than k2 then the observed rate law would be 1 21 2A zCI k2 1B cn 21 Which statement concerning a possible mechanism for a reaction is false A possible mechanism must be consistent with the experimental data Each elementary step is represented by a balanced equation The elementary steps must add to give the equation for the overall reaction The speed of the slow step limits the rate at which the overall reaction occurs For all reactions the experimentally determined reaction orders of the reactants indicate the number of molecules of those reactants involved in the slow step of the mechanism 09069 zz Reacuun rates 1nerease w1th 1nereas1ng temperature heeause a e an un en 1nere e the energy quhetxansmun state1s1nweren h 1argerrnn1een1es Eulhdemure rennenuy a eaetryatrnn energyrsneereasen e a geater acnun ufmulecules pussess the aeayaann energy when they culhde z Ca1eu1ate the aeayannn energy nfareaetannrfthe rate ennstantrs n 75 s at 25 C and 11 5 s at7s c The umversal gas ennstant a 314 Jrnn11lt 1 1 k E 1n 7 k R T a A eata1yst1nwers the aeayaa n en h A eata1yst ean m e a nunwuntaneuus reaeann wantzneuus e A eata1yst speeds up bath the fumd and reverse reaeann a A eata1yst speeds up the rate nfreaeann e Cata1yst are u en transann rneta1s and transrhnn rneta1 ux1des 24 Whreh quhe fulluwmg statements ahnnt eata1ysts are 21537 3 Y 25 censrner the fulluwmg eata1yzenreaeann 2 NO 9 N2 9 02 g Whreh rewunse 1ne1nnes unly m statementsv 1 Ptan N1Oareeat y ts 11 Ths1s an example un hnrnngenenns eata1ys1s 111 Thu reaeann Wuuld nnt he spentanenns ynthnnt the eata1ysts y I a I H b I H HI 1 d H I e 26 penance nmoznrnmnnanMsn nn henna n H mm cjn nnas a I 11112 e n nnnnsnn 27 The annctnntrn tn nte mnentn 1n m 11w nrnngnt e ka1s nnnzus Annex n51 nunnrzsi nnnus 2 2 2 2 2 2 39 a 5WWW 3 HA D 0km D 3 HA D kAD nnnteswnrttrn nntte aeaenetnn US My 1 s n n he a 91 n2 2 Fnsz 7 order second enrdmm 1 k Ah 1 U13MW32C1255WUU33M7 vsrrovdtzv LnArhxLnAn secondrovdtzv rpj an51 bj lz 014 n31 e111 31 Consider the following hypothetical chemical reaction 2A 2B 9 C The mechanism for this reaction is 1 2A B 9 D slow 2 D B 9 E fast 3 A E 9 C fast Which one of the following is the correct rate law for this reaction a Rate kA2B b Rate kDB c Rate kAE d Rate kAB 32 For the elementary reaction NO3 CO 9 N02 COZ a the molecularity is 2 and rate kNOzCOz b the molecularity is 2 and rate kNOgCONOZCOZ c the molecularity is 4 and rate kNOgCONOzCOz d the molecularity is 4 and rate kNOzCOzN03CO e the molecularity is 2 and rate kNO3CO 33 Which substance in the reaction below either appears or disappears the fastest 4N39H3 702 9 4NOZ 6HZO a N02 b H20 c Oz d NH3 34 Consider the following reaction A 9 3C The average rate of appearance of C is given by AC At and the average rate of disappearance of A is given by AA A t How is the average rate of appearance of C related to the average rate of disap pearance of A a 3AA At b 2 AA At c AA At d AA2 At 35 The kinetics of the reaction below were studied and it was determined that the reaction rate increased by a factor of 9 when the concentration of B was tripled The reaction is order in B a first b zero c second d one half e third 36 Use the information below to determine the order of the reaction in reactant A A B 9 P Trial LLA M LLB M m 1 0273 0763 283 2 0273 1526 283 3 0819 0763 2547 a 3 b 4 c 2 d 0 e 1 37 Given the initialrate data below for the reaction the correct rate law is rate Initial Conc 1l Reactants A B 9 P Trial A M B M 1 0273 0763 283 2 0273 1526 283 3 0819 0763 2547 a kAlle b kAllB 0 kA2 B2 d kA 2 6 klAllB2 38 A certain zeroorder reaction has a halflife of 18 seconds when the initial concentration of reactant is 071 M What is the reac tion rate constant in Lm 01s for this reaction Ln 2 A Zero 7 order 112 First 7 order 112 211 sec and 7 orderllZ 1 kAlo a 0038 b 0078 c 0020 d 13 e 0025 39 The reaction rate constant for a particular second order reaction is 013 Lmols 1f the initial concentration of reactant is 026 molL how many seconds will it take for the concentration to decrease to 013 mo rst 7 order LnA 7k1 LnA0 second 7 order i7 L A Ao First 7 order tlZ Lyle second 7 order tlZ L Zero7 ordertlZ A k kAo 2k a 050s b 0017s c 10s d 30s e 53s 40 Which type of elementary process below is the slowest a 1 1 1 1 1 c 1 1 Higher molecularity means slowest rate of reaction 41 Given the following mechanism which species below may be classified as intermediates in the formation of X0 from X and 2 X YOZ 9 X0 YO a YO only b X only XO YO 9 X02 Y d both X0 and Y0 c both X and YOZ Y Oz 9YO 0 e both YOZ and Oz YO O 9YOZ 42 Calculate the activation energy of a reaction that has a rate constant of 441 x 103s391 at 78 K and rate constant of 979 x 102s391 at k E 315 K Ln 2 k R Tl T2 a 00589 kJmol b 130 kJmol c 290 kJmol d 267 kJmol 43 A reaction with activation energy of 123 kJmol has a rate constant of 0200 s391 at 343 K At what temperature will its rate con E 1 k2 a stant be double that at 343 K Ln k1 R Tl T2 a 316 K b 304 K c 622 K d 246 K e 349 K
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