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Summer015chem15exam#A 1Jun115 CHEM 15 Date: 4-Jun-15 last name) (first name) Print Name: Instructor: Dr. Gulotta DIRECTIONS* ( PUT*AWAY*YOUR*CELL*PHONE.*IF*YOU*ARE*CAUGHT*USING*A*CELL*PHONE*OR*PDA*YOU*WILL*BE*EJECTED*FROM*THE*EXAM* IMMEDIATELY*AND*GIVEN*A*ZERO)* 1.Firstfillintheinformationatthetopofthispaper.Printyourlastnameasitappearsontheclassroster, thenprintyourfirstnameandmiddleinitial.thenreadandsignthehonorcodestatementbelow.finally fillintherequestedinformationonthescan=tron*answer*sheetaccordingtothefollowingscheme: Printyournameinthespace*labeled*NAME1(printlastnamefirst) Signyournameinthespace*labeled**.Thelastpageofthisexamisaperiodictable.Italsohasalistofseveralimportantconstants.Youmay carefullyremovethislastpage,ifyouchoose,butdonotopenthestaple. 3.Thisexamconsistsofthreeparts,:A,BandC.PART*Ahas16multiplechoicequestionsworth3points eachforatotalof48points.part*bhas8multiplechoicequestionswherethecorrectanswerisworth3 pointseachandthecorrectworkisworthanadditionalpointseachforatotalof5pointsperquestion. Thesectionisworth40points.Eachquestionhasonlyonecorrectanswer,andnocreditislostifyou chooseawronganswer.therefore,leavenoquestionunanswered,evenifyousimplymustguess. UsetheScantronforenteringthemultiplechoiceanswersandthetestforshowingyourwork. 4.PART*Cconsistsofshortanswersquestionsworthatotalof1points.Showallwork,showhowtheunits canceltogivethefinalunitsonyouranswer,andreportyouranswertothepropernumberofsignificant figures,roundingproperlyasyoudoso.writeyourfinalanswersinthespacesprovided.inpart*c,no creditisgivensimplyforthecorrectanswer11creditisgivenonlyforthecorrectmethodandaccompanying work.usingapoorbutcorrectmethodmayresultinsomelossofcredit. Partialcreditisgivenwhereappropriate.Arithmeticmistakesresultinrelativelylittlelossofcredit. HONOR%CODE%STATEMENT:OnmyhonorIpledgethatIhavenotviolatedtheprovisionsoftheNIITstudent honorcode. Signature: DONOTWRITEBELOWTHISLINE PARTA+PPARTBmultiplechoice: (7) PARTBwork: (16) PARTCwork: (1) TOTALSCORE: Page1of9
Summer015chem15exam#A 1Jun115 Part*A:*16*multiple*choice*questions*worth*3*points*each*for*a*total*of*48*points* 1. Givethecomplete*ionic*equationforthereaction(ifany)thatoccurswhenaqueoussolutionsof lithiumsulfideandcopper(ii)nitratearemixed. A. Li+(aq) + SO4 - (aq) + Cu+(aq) + NO3 - (aq) CuS(s) + Li+(aq) + NO3 - (aq) Pageof9 B. Li+(aq) + S-(aq) + Cu+(aq) + NO3 - (aq) CuS(s) + LiNO3(aq) C. Li+(aq) + S-(aq) + Cu+(aq) + NO3 - (aq) Cu+(aq) + S-(aq) + LiNO3(s) D. Li+(aq) + S-(aq) + Cu+(aq) + NO3 - (aq) CuS(s) + Li+(aq) + NO3 - (aq) E. Li+(aq) + SO4 - (aq) + Cu+(aq) + NO3 - (aq) Li+(aq) + SO4 - (aq) + Cu+(aq) + NO3 - (aq). Whichofthefollowingsolutionswillhavethehighestconcentrationofchlorideions? A. 0.60MLiCl B. 0.40MMgCl C. 0.50MAlCl 3 D. 0.80MNaCl E. 0.60MCaCl 3. Whichsolutionwillgivethebrightestlightwhenattachedtoanelectriccircuit? A. 1.0Msucrose B. 1.0MC H 4 O (aceticacid) C. 1.0MHCl D. 1.0MNaCl E. 1.0MCaCl 4. AttheendpointofatitrationreactionwhereNaOHistitratedintoasolutionofH SO 4 A. [H SO 4 ]=[NaOH]addedtothesolution B. #molesh + =#molesoh 1 C. ThevolumeofNaOHadded=volumeofH SO 4 D. Volume(H SO 4 )([H SO 4 ])=Volume(NaOH)([NaOH]) E. Alloftheabove 5. Ifthepressureonagassampleisdoubled,whatwillhappentothevolume? A. Itwilldouble. B. Itwillincreasebyasmallamount C. Itwilldecreasebyasmallamount D. Itwillbehalved. 6. Whichofthefollowingwilloccurifthetemperatureofagasisincreasedfrom0 Cto40 C? A. Thevolumewilldouble. B. Thevolumewillincreasebyasmallamount C. Thevolumewilldecreasebyasmallamount D. Thevolumewillbehalved. 7. Amixtureof1.0molHeand1.0molNeareatSTPinarigidcontainer.Whichofthefollowing statementsistrue? A. Bothgaseshavethesameaveragekineticenergy. B. Bothgasescontributeequallytothedensityofthemixtureundertheseconditions. C. Bothgaseshavethesamemolecularspeed. D. Themixturehasavolumeof.4L E. AlloftheaboveareTRUE.
Summer015chem15exam#A 1Jun115 8. Whichofthegasesinthegraphbelowhasthelargestmolarmass? A. A B. B C. C D. D E. Thereisinsufficientinformationtomakethisdetermination. 9. Energythatisassociatedwiththepositionorcompositionofanobjectiscalled A. kineticenergy B. thermalenergy C. potentialenergy D. chemicalenergy 10. Whichofthefollowingsubstances(withspecificheatcapacityprovided)wouldshowthegreatest temperaturechangeuponabsorbing100.0jofheat? A. 10.0gAg,CAg=0.35J/g C B. 10.0gHO,CHO=4.18J/g C C. 10.0gethanol,Cethanol=.4J/g C D. 10.0gFe,CFe=0.449J/g C E. 10.0gAu,CAu=0.18J/g C 11. Apieceofiron(C=0.449J/g C)andapieceofgold(C=0.18J/g C)haveidenticalmasses.Iftheiron hasaninitialtemperatureof498kandthegoldhasaninitialtemperatureof98k,whichofthe followingstatementsistrueoftheoutcomewhenthetwometalsareplacedincontactwithone another?assumenoheatislosttothesurroundings. A. Sincethetwometalshavethesamemass,thefinaltemperatureofthetwometalswillbe 398K,exactlyhalfwaybetweenthetwoinitialtemperatures. B. Sincethetwometalshavethesamemass,butthespecificheatcapacityofgoldismuch smallerthanthatofiron,thefinaltemperatureofthetwometalswillbecloserto98kthan to498k. C. Sincethetwometalshavethesamemass,butthespecificheatcapacityofgoldismuch smallerthanthatofiron,thegoldwillgainmoreheatthantheironwillloose. D. Sincethetwometalshavethesamemass,butthespecificheatcapacityofgoldismuch smallerthanthatofiron,thefinaltemperatureofthetwometalswillbecloserto498kthan to98k. E. Noneoftheaboveistrue. Page3of9
Summer015chem15exam#A 1Jun115 1. Whichofthefollowingsignsonqandwrepresentasystemthatisdoingworkonthesurroundings, aswellaslosingheattothesurroundings? A. q<0,w<0 B. q>0,w<0 C. q<0,w>0 D. q>0,w>0 E. q==w 13. Whenwavesofequalamplitudefromtwosourcesareinphasewhentheyinteract,itiscalled A. Destructiveinterference B. Subtraction C. Constructiveinterference D. Diffraction E. Effusion 14. Whichofthefollowingoccurastheenergyofaphotonincreases? A. Itswavelengthincreases B. Itsfrequencyincreases C. Itsspeedincreases D. Itsamplitudeincreases E. Plank sconstantincreases 15. Whichofthefollowingquantumnumbersdescribestheshapeofanorbital? A. Principalquantumnumber B. Spinquantumnumber C. Schrödingerquantumnumber D. Magneticquantumnumber E. Angularmomentumquantumnumber 16. Iftwoelectronsinthesameatomhavethesamevalueof"l",theyarebestdescribedasbeing A. inthesamesublevel,butnotnecessarilyinthesameenergylevel. B. inthesameenergylevel,butdifferentsublevel. C. inthesameorbital. D. indifferentenergylevelsandindifferentshapedorbitals. E. Degenerateinenergy System(is(doing(work(so(w(<(0,(system(is(producing(heat(so(q(<(0( Page4of9
Summer015chem15exam#A 1Jun115 Part*B:*8*multiple*choice*questions.**The*correct*answer*is*worth*3*points*and*the*appropriate*work*is* worth*an*additional**points*for*a*total*of*5*points*per*question.**the*section*is*worth*40*points. 1. Whatisthemolarconcentrationofsodiumionsina0.450MNa3PO4solution? A. 0.150M 0.450"#$%" " 3" = 1.35( B. 0.450M " " C. 0.900M D. 1.35M E. 1.80M. Howmanymillilitersof0.60MNaSareneededtoreactwith40.00mLof0.315MAgNO3?The reactionis:nas(aq)+agno3(aq)nano3(aq)+ags(aq) A. 4.ml 0.315"#$%"" 1"#$%" (0.04000) B. 40.0ml = 6.310 "#$%" ;( "#$%"" 1 1000" = 4."( 6.310"#$%" 0.60"#$% 3. 4. 5. 6. C. 48.5ml D. 66.0ml E. 96.9ml A.00Lballooninitiallyat5 Cexpandsto6.00Latthesamepressure.Whatisthefinal temperatureoftheballoon? A. 70 C 6.00 B. 130 C = 894 73 = 61 = (5 + 73 = 98).00 C. 1198 C D. 38 C E. 61 C A0.465gsampleofanunknowncompoundoccupies45mLat98Kand1.atm.Whatisthe molarmassoftheunknowncompound? (1."#)(0.45) A. 6.3g/mol " = = = 1.10"#$% B. 33.9g/mol " 0.081 "# (98) "# C. 1.g/mol 0.465 D. 38.0g/mol = 38.06/"#$ 1.10"#$% E. 81.8g/mol Calculatethechangeininternalenergy(ΔE)forasystemthatisgivingoff5.0kJofheatandis changingfrom1.00lto6.00linvolumeat1.50atmpressure.(rememberthat101.3j=1lsatm) A. +5.9kJ = = 1.50"#(6.00 1.00) = + = 5.0" + 0.91" B. 116.0kJ 101.3 1" = 4.1" = 9.00 "# C. 15.9kJ "# 1000 D. 14.1kJ = 0.91" E. 937kJ Determinethefinaltemperatureofagoldnugget(mass=376g)thatstartsat398Kandloses4.85 kjofheattoasnowbankwhenitislost.thespecificheatcapacityofgoldis0.18j/g C. A. 133K 4.8510 B. 187K = 101 = 101 = ; = = 1 0.18(376) C. 97K D. 377K = ; = 101 + 398 = 97 E. 398K Page5of9
Summer015chem15exam#A 1Jun115 7. Aphotonwith5.1electronvolts(eV)ofenergycancauseanelectrontobeejectedfromapieceof gold.whatisthewavelengthoflightforthisphoton?(1ev=1.60x10 119 J,massofanelectron= 9.11x10 131 kg) A. 14nm B. 1.3x10 15 nm C. 8.13x10 15 nm D. 50nm E. 1338nm 8. Calculatethewavelengthofanelectron(m=9.11 1018g)movingat3.66 106m/s. A. 1.99x10 110 m B. 5.03x10 110 m C. 1.81x10 110 m D. 5.5x10 19 m E..76x10 19 m = h; = "" = h h (6.6610" "# = = ) 3.010 5.1" 1.6010" = 1.9910" 8.1610 " 1" =.4410 10 " = 44" = h " = 6.6610 " " 9.1110 " " 3.6610 = 1.9910 " Page6of9
Summer015chem15exam#A 1Jun115 Part*C:*Short*answer*problems*worth*a*total*of*1*points. 1. (6pts)Calculatethestandardenthalpychange,ΔH o,fortheformationof1molofstrontium carbonate(thematerialthatgivestheredcolorinfireworks)fromitselements. Sr (s) (1) () (3) + Sr (s) SrO (s) C(graphite) The information + + 1 C(graphite) O CO + available is (g) (g) O + (g) 3 O (g) SrO (s) SrCO 3 CO (s) (g) SrCO (s) 3 ΔH = ΔH = ΔH - 59 kj - 34 kj = - 394 kj Sr (s) (+((1/(+(/(=(3/)O (g) ((SrCO 3(s) ( ΔH(=(F59kJ(+(F34(kJ(+(F394kJ(=(F10kJ( This(is(very(easy.((To(get(full(credit(they(must(show(how(the(3(equatHions(add(together(to(get(the(overall(equation((cross( out(intermediates)(4pts).thenthecorrectvalueofδh(must(be(calculated. Page7of9
Summer015chem15exam#A 1Jun115. (6pts)Nitricacid,HNO 3 reactswithzincmetaltoformzincnitrateandhydrogengasbythe followingunbalancedequation:hno 3(l) +Zn (s) Zn(NO 3 ) (aq) +H (g).startingwith00.0mlof 0.50MHNO 3,zincmetalisaddeduntilalloftheHNO 3 reacts.thehydrogengasiscollectedina 600mlflaskat5 C.Whatisthepressureintheflask? 0.00 0.50"#$%" = 1"#$ = 0.05"#$%" = 0.05"#$% "#$%" ; = "# "# 0.05"#$% 0.081 "#$ 0.600 correct(balancing(of(equation((1(pt)( compute(number(of(moles(of(h (g) ((3(pts)( solving(the(ideal(gas(law(correctly(((pts)( ( calculator(error(f1( 5 + 73 = 98 =. ""#* Page8of9
Summer015chem15exam#A 1Jun115 Page9of9