Exam 3 Practice Test
Exam 3 Practice Test CHEM 212 - 001
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This 15 page Study Guide was uploaded by medicalwoohoo on Tuesday September 1, 2015. The Study Guide belongs to CHEM 212 - 001 at George Mason University taught by Weatherspoon in Spring 2015. Since its upload, it has received 44 views. For similar materials see General Chemistry II in Chemistry at George Mason University.
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Date Created: 09/01/15
CHEMISTRY 212 Lect Sect 001 Name B Dr G L R Weatherspoon Last First Exam 3Tuesday November 22 2011 G CLOSED BOOK EXAM No notes or books allowed Calculators may be used Atomic masses of interest are included on the last page Periodic tables are not allowed for this examCIRCLE YOUR ANSWERS TO THE PROBLEMS SHOWN BELOW 1 The thermodynamic quantity that expresses the degree of disorder in a system is a enthalpy b internalenergy c bond energy ntropy e heat flow 6 3 Potassium chlorate a common oxidizing agent in fireworks and matchheads undergoes a 5 Elite disproportionation reaction when heated KC03 5 5KCIO4 s KCI 5 Calculate which is Aernquot at 25 C for this reaction Substance AHfO so l2 KCI s 4367 kJmol 826 Jmol K KC03 s 3977 kJmol 1431 Jmol V I 2 70135 KCIO4 s 4328 kJmol 1510 JNK 0 I N a 177001 b 5188 kJ c 49410kJ d X 35 J 1334 kJ E T entropy value per mole 5 Which of the following would be expected to have thej a 59 b 529 580 d soaQvie 5030 6 What is the cell reaction for the voltaic cell Crs V qu C2g Cl aq Pt fl C4 k a Crs ZCIaq 029 Cr3laql SC 01139 a n a bk 0 l U L b 2 Cr3aq 6Claq 2Crs 3Cl c Crs 3C2g Cr3s 2Cl aq 3 713 2Crs 3020 a 2Cr3iacn I a Z Cr SB A 32 quota O T none of these 9 3 C 12 a c I 2r 2e 8 How does the number of de r ffreedom of a molecule relate to Its entropy W he greater the num degrees of freedom the greater the entropy 19 t he fewer the nu be f degrees of freedom the lower the entropy c the greater th er of degrees of freedom the lower the entropy d the fewer t ber of degrees of freedom the greater the entropy e there is yq tionship between the number of degrees of freedom and the entropy 9 The ha ction occurring at the cathode in the voltaic reaction is 3MnO4 aq 24H aq 5Fe s gt 3Mn2 aq 5Ie3 aq 12H20 I MnO4 aq 8H aq 5e 9 Mn aq 4H20 I am 2MnO4 aq12Haq6e 2Mn2aq 3H20 I c Fe 5 a Fe3aq3e 016A C105quotr d Fe 5 a Fe3 aq 2e 9 Fe2 aq a Fe3 aq e K1 7 CHEMISTRY 212 Lect Sect 001 Name Dr G L R Weatherspoon Last First Exam 3Tuesday November 22 2011 G SHOW ALL WORK FOR THE FOLLOWING PROBLEMS PLACE YOUR FINAL ANSWERS IN THE BOXES PROVIDED CREDIT WILL NOT BE GIVEN FOR ANSWERS WITHOUT SUPPORTING SOLUTIONS TO THE PROBLEM Full credit Will not be given for numerical values that do not include units WRITE LEGIBLY PROBLEMS WILL NOT BE REGRADED 6 DUE TO POOR PENMANSHIP 10 A BaSO4 slurry is ingested before the gastrointestinal tract is xrayed because it is opaque to xr y and defines the contours of the tract Ba2 ion is toxic but the compound is nearly insolubl G at 37 C body temperature is 591 kJmole for the process BaSO4 s e Ba2 aq 0 2 what is the Ba2 in the intestinal tract Assume that the only source of 042 is the inges i rry Bahage AGO KSMOlQ qu T 370 6 male 2 56 L567 4 K C qlr3 C 0 Zr 75 L X 561100 9 I H gm in K 36 K a flaw 3L hearsayLO a X 09 J y O JigrS 7KY Q 0 n my 46 n K 2 CHEMISTRY 212 Lect Sect 001 Name Dr G L R Weatherspoon Last First Exam 3Tuesday November 22 2011 G 11 A thin circulardisk earring 400 cm in diameter is plated with a coating of gold 025 mm thick from an Au3 bath Au 1970 gmol V nrzh 14 3 C a How many days does it take to deposit the gold on one side of one earring if the current is held A steady at 0013 Amperes density of gold 193 gcm3 BOOM l 1m daysl0gi 1 faquot r v 3 25 900 PM On 13 Wol C 395 a O39glqcm l Ci103 0 6 govcm b 1 g Cm7gt ol Ima l b How many days does it take to deposit the gold on both side of the pair of earrings r V A davsgg c If the price of gold is 1210 per troy ounce 3110 g whwtotal cost of the gold plating cost 2 Q32 b 5 aosmcml mg big E6 V 9 0 lmo 3 lt2 xQQfZ 1 65 C y CHEMISTRY 212 Lect Sect 001 Name Dr G L R Weatherspoon Last First Exam 3Tuesday November 22 2011 G 12 Magnesia MgO is used for fire brick crucibles and furnace linings because of its high melting point It is produced by decomposing magnesite MgCOg at around 1200 C Substance AHfO kJmol S Jmol K Mg 5 0 3269 MgC03 s 1112 6586 MgO s 6012 269 6 c s o 5686 co2 g 3935 2137 q 02 g 0 2050 a Write a balanced equation for magnesite decomposition 5 g C O 3 a M5 0 z 4amp4 eom Q3 c Assuming AH and S do not change with tegemre find the minimum temperature at which the reaction is spontaneous amp Tmin d Calcul equilibrium PCO2 above MgC03 at 1200K 2 J b Use AH and S values to find AG at 298K pCOZ 1200K CHEMISTRY 212 Lect Sect 001 Name B Dr G L R Weatherspoon Last First Exam 3Tuesday November 22 2011 G 13 Aqua regia a mixture of concentrated HN03 and HCI was developed by alchemists as a means to quotdissolvequot gold The process is a redox reaction with the following simplified skeleton reaction Balance the reaction in acidic solution then convert it to basic solution Identify the oxidizing and reducing agents in the reaction L 2 z Au 5 Nosaq ICI 061 gt ch aq 029 Q9 0 lt9 quot 43 39gt 29 Halfreaction We duction Ag aq e399 Ag 5 080 V I2 5 2e39 9 2r aq a 053 v AI3 aq ageW 166 v 2H aq zea g 000 v 14 Given that the AH0 100 l for the cell reaction 2Agaq 2 aq gt l2 s 2Ags at 25 C estimate the emf of t II at 80 C Assume that AH is independent of temperature over the relevant temperat ge M 12 V 11220 6 T X Cf K L g 06 kjWo ln 1 Ease l w n if M K 101 1 Ta 5 CHEMISTRY 212 Lect Sect 001 Name B Dr G L R Weatherspoon Last First Exam 3Tuesday November 22 2011 G 15 In a certain experiment the Eceu078 v at 25 C Suppose that A3 100 x 10 4 M and the pressure due to hydrogen H2 is 125 x 104 Pa where Papascals Calculate the pH of the solution assuming ideal solution behavior Name KEY EQUATIONS fp cyclohexane655 C kf cyclohexane 202 Cm KE vaz me 911 x 103931 kg mp 1673 x 103927 kg mn 1675 x 103927 kg Kf water 186 Cm Kbwater 0512 Cm J N m J C39V e 2718 F 96500 C N m kg s392 N0NA602 x 1023 unitsmol R 00821 LatmmolK R 8314 Jmol 0 K 1 Latm 101J 0101 k 1 Pa 1 kgm 52 1 Nm2 1 atm 101 x 105 Pa 1 bar g 9807 ms2 M nV w PAV AUqw AHOan ZAHf products ZAHf reactants Aern AUrxn PAV AH nCpAT AH cpAT q msAT 1 Ci 3700 x 1010 dps tlz 5730 years for 14C quot13 9 Xi quottotal Ptotal Pi XiPT Q PT 0 P2 W 1 1 log 71 2 3R 7 7 0 53m 1 1 R TI TZ 9 V 627 S kHP PAPAXA APP XB ATb Kme ATf Kme 31 MRT AL A0 In kt 3 N 19 G kt2303 A0 I k2 Ea 1 1 0 g k1 2303R z 2 1212 Q I log k pr f eEaRT rms K reverse Kfo rwa rd H3025239 H25 Wmax quotn FEcell EOcell EOcathode 39 annode AGO nFE cell Aern AGOrxn RTInQ AGOrxn RT an Aern RTlnQK Equotcell 00592nog K Ecell Eocell 39005920IOEQ C2 It ASfus AHfusTm H 1008 B 1081 K 3910 C 1201 Br 7990 Cl 3545 N 1400 Cr 5200 P 3097 0 1600 S 3200 Zn 6539 Na 2300 12690 Cu 6354 Ca 4008 F 1900 Fe 5585 Ni 5870 Co 5893 Ag CHEMISTRY 212 Lect Sect 002 Name Dr G L R Weatherspoon Last First Exam 3Tuesday April 24 2012 G CLOSED BOOK EXAM No notes or books allowed Calculators may be used Atomic masses of interest are included on the last page Periodic tables are not allowed for this exam CIRCLE YOUR ANSWERS TO THE PROBLEMS SHOWN BELOW 1 D CU 7 Which one of the following species is paramagnetic a Cu Cr3 d Ca How many d electrons are in the cobalt ion of K3CoCN6 a 3 b 5 s d 7 c Zn e Ag e 4 Transition metal complexes that contain CN as a ligand usually conform to a lowspin configuration Which of the following is correct about the complex in problem 2 a tzgsego paramagnetic b t2g3eg3 paramagnetic c t2g3eg3 diamagnetic 6 o 2g eg dIamagnetIc e t2g4eg2 paramagnetic Compounds such as the YBCO superconductor are considered to be diamagnetic Which one of the following forms of radiation can penetrate the deepest into body tissue b beta a paramagnetic c ferromagnetic d ferrimagnetic a alpha gamma d positron e proton The noble gas thought to be significantly carcinogenic due to its radioactive decay and that of its decay products is a helium b xenon c argon radon e neon Given the following information determine the standard potential in Volts of a cell based on the reaction 35n4 aq 2Cr s gt 35n2 aq 2Cr3 aq Half reaction E reduction C 5n4 aq 2e 5n2 aq 0154 v re2 aq 2e39 a Fe s o44o v Fe3 aq e39 a Fe2 aq 0771 V A Cr3 aq 3e39 a Cr s o74o v a 194 089 c 253 d 059 e 102 The standard reduction potentials in Volts for Zn2 and Cu2 are 076 and 034 respectively What is the concentration of Zn2 in M when the following cell has the potential of 130 V at 25 C Zns Zn2X M H Cu2 40x 10 5 M Cu s 17 x 10 12 1 V a 10 c 44 x 10 87 d 41 x 10 9 e 44 x 10 3 EX3 sprl 2browleburgglrw 1 CHEMISTRY 212 Lect Sect 002 Name B Dr G L R Weatherspoon Last First Exam 3Tuesday April 24 2012 G 9 How many minutes will it take to plate out 219 grams of chromium metal from a solution of Cr3 using a current of 352 amps 577 b 346 c 115 d 192 e 173 10 Potassium chlorate a common oxidizing agent in fireworks and matchheads undergoes a solidstate disproportionation reaction when heated KCI03 s KCI04 s KCI 5 Calculate AGsys which is Aern at 25 C for this reaction Substance AHfO So KCI s 4367 kJmol 826 Jmo K KC03 s 3977 kJmol 1431 JmoI39K KCO4 s 4328 kJmol 1510 JmoI39K a 177001 b 5188 k C 49410 k d 1235 J 1334 k o lmol M l C MW 6 a A lmol lmolo GOSH Silwn EX3 sprl 2browleburgglrw 2 CHEMISTRY 212 Lect Sect 002 Name Dr G L R Weatherspoon Last First Exam 3Tuesday April 24 2012 G SHOW ALL WORK FOR THE FOLLOWING PROBLEMS PLACE YOUR FINAL ANSWERS IN THE BOXES PROVIDED CREDIT WILL NOT BE GIVEN FOR ANSWERS WITHOUT SUPPORTING SOLUTIONS TO THE PROBLEM Full credit will not be given for numerical values that do not include units WRITE LEGIBLY PROBLEMS WILL NOT BE REGRADED DUE TO POOR PENMANSHIP 11 a Lead sulfate is a key component in lead acid car batteries Its solubility in Ksp i 0 E533 water at 25 C is 425 x103 g100 mL solution What is the KSID of lead sulfate cilSe BS zoomL KlOOMZ a 7 Oggj lquL H kgp Plgz rj gdjzfB C b When ead fluoride is shaken with pure water at 25 C the solubility is found to be 064 gL Calculate the Ksp of lead fluoride Ksp 7 E x g Pisa93 2 PB 4 3F DtUlj Wo 2Ca 3H I L 232j Keg 0ij C215 2 ZZLE63Q CZQE Z 73 EX3spr12browleburgglrw 3 CHEMISTRY 212 Lect Sect 002 Name Dr G L R Weatherspoon Last First Exam 3Tuesday April 24 2012 G 12 Ethylenediaminetetraacetic acid abbreviated as H4EDTA is a tetraprotic acid Its salts are used to treat toxic metal poisoning by forming soluble complex ions that are then excreted Because EDTA4 also binds essential calcium ions it is often administered as the calcium disodium salt For example when Na2CaEDTA is given to a patient the CaEDTA2 ions react with circulating Pb2 ions and the metal ions are exchanged CaEDTA2 aq sz aq lt gt PbEDTA2 aq Ca2 aq A child has a dangerous blood lead level of 120 ug100 mL If the child is administered 1000 mL of 010 M Na2CaEDTA assuming the exchange reaction and excretion process are 100 efficient what is the final concentration of Pb2 in uG100 mL blood Total blood volume is 15 L Kc 25 x 107 Pb2 361 E39 0 uG Pb2100 mL blood EX3 sprl 2browleburgglrw 4 CHEMISTRY 212 Lect Sect 002 Dr G L R Weatherspoon Exam 3Tuesday April 24 2012 Name Last G First 13 Hydrogenation is the addition of Hz to double or triple carbon carbon bonds Peanut butter and most commercial baked goods include hydrogenated oils Find AH AS and AG for the hydrogenation of ethene C2H4 to ethane C2H6 at 25 C Substance AHfO kJmol So Jmo K c s o 5686 co2 g 3935 2137 H2 g 0 1306 czH4 g 5247 21922 csz g 84667 2295 1C 7L M737 Cap AC 4 Cl P gaggl 17 267 EX3 sprl 2browleburgglrw AH 5437 a kJmol AS JmoK AG IOL Q 3 kJmol CHEMISTRY 212 Lect Sect 002 Name Dr G L R Weatherspoon Last First Exam 3Tuesday April 24 2012 G 10 pts 14 In 1988 the Shroud of Turin c a39 ed by some to have been us c to bury Christ was age dated by isotopic analysis of its carbon content e fractional conte of 14C from a sample from the shroud was 122x1012 How old is the shroud IfI A ere 2000 ars old what fractional content would it have age Q Slayears fraction l E Ex3spr12browleburgglrw 6 Name 7 KEY EQUATIONS S kHP P Pquot x fp cyclohexane655 C A POAX A kfcyclohexane 202 Cm A B KE mv22 ATb Kbcm me 911 x 103931 kg Mr Kme mF 1673 x 103927 kg 7 Wquot mn 1675 x 103927 kg In AL kt Kf water 186 Cm A0 Kbwater 0512 Cm J Nm Iog A kt2303 J C39V 0 e2718 IO k2 E i i F 96500 c2 3 k1 23031 T1 T2 N mkgs 23 t12 0693k N0NA602 x 10 unItsmol k pr R 00821 LatmmolK f eEaRT R 8314 Jmol 0 K 1 Latm 101 J 0101 kJ m5 1 Pa 1 kgm 2 1 Wm2 Mm 1 atm 101 x 105 Pa 1 bar CCDd g 9807 ms2 kc a b M My A B w PAV Q Clquot39Dld AUqw c AiaBib AH an ZAHf products ZAHf reactants K K RTAn Aern Aurxn PAV p c A A A Kreverse 1 Kforward q msAT 2 2 1 Ci 3700 x 1010 dps H30 S t12 5730 years for 14C H25 71 Wmax 39nFEcell Xi 1 1 E0 E0 E0 P cell cathode anode ntotal total AGO nFE0ce Pi XiPT AGrxn AGorxn RTInQ PT ZPi AGorxn RT an IO i AHvap i i Aern RTInQK g 101 2303R T1 2 E0quot 000592nlog K E E 00592nlogQ 0 cell cell In ii 0 K1 R Tl TZ ASfus AHfusTm H 1008 B 1081 K 3910 Ca 4008 C 1201 Br 7990 Cl 3545 F 1900 N 1400 Cr 5200 P 3097 Fe 5585 0 1600 5 3200 Zn 6539 Ni 5870 Pb 2072 Na 2300 12690 Cu 6354 Co 5893 Ag 1079 ffCHEMISTRY 212 Lect Sect 002 3quot Dr G L R Weatherspoon Exam 3Tuesday April 24 2012 SHOW ALL WORK FOR THE FOLLOWING PROBLEMS PLACE YOUR FINAL ANSWERS IN THE BOXES PROVIDED CREDIT WILL NOT BE GIVEN FOR ANSWERS WITHOUT SUPPORTING SOLUTIONS TO THE PROBLEM Full credit will not be given for numerical 39 values that do not include units W aELEGIWEMS WILL NOT BE REGRADED DUE TO POOR PENMANSHIP 5 4 1 gilmlmj 4 ag 1 10 pts 1 HidWork L 11 a Leadll sulfate 39 ey com adacid car ba ries Its solubility in Ksp 1quot lay0 J M water at 25 C is 25 x10 glOO mL solution What is the KSp of lead sulfate PB 30463 9 P6 12 f 04265 Kgpy pb jfng View 8W quotquotMpwi Mme icioxO VM H592 loovisa 1 1 03301 0552 3 Duty80423 iciom4M K805 aiLlDYIOHLiNDZT M y 21141l b When leadl fluoride is shaken with pure water at 25 C the solubility is found R to be 064 gL Calculate the K5p of lead fluoride Ksp 770209ng 3 was pr b Jr SQFT KEP Play3 93 1 WM 30925462 pug 0in pig 1w P58 3 4 4y 3M pm i L g 024511 Uij J Hz25 3 P524 paw0W ifj 35sz 0 3m E77 673 1 Fjlr 4 Ma 3amp9 52500 7M Ex3spr12browleburgglrw 3
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