第37届国际化学奥林匹克竞赛预备试题英文Word格式.docx
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2-2
2-3
2-4
2-5
2-6
2-7
2-8
48
Problem3：
OrganicPhotochemistryandPhotophysics
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
36
Problem4：
GoldCapitalofAsia
4A-1
4A-2
4A-3
4A-4
4A-5
4A-6
4B-1
4B-2
4B-3
4B-4
4B-5
2
2
8
42
Problem5：
LewisStructure
5-1
5-2
5-3
5-4
5-5
5
21
Problem6：
AlkalinityofWaterandSolubilityofCO2
6-1
6-2
6-3
6-4
6-5
6-6
6-7
6-8
40
Problem7：
KineticBehaviorBehaviorofOzone
7-1
7-2
7-3
7-4
7-5
Σ
28
Received
Problem8：
ProteinFolding
8-1
8-2
8-3
8-4
8-5
8-6
8-7
26
Expressyouranswerfromhightolowmeltingpointasfollows：
＞＞（InsertcompoundcodesA,B,C）
1-2Answerformultiplechoicequestion：
1-3DrawthestructuralformulaoftripeptideGly-Gly-Gly
Thenumberofallpossiblelineartripeptidesis：
Thenumberofopticallyactivelineartripeptidesis：
Expressyouranswerfromhightolowbindingaffinityasfollows：
＞＞（InsertcompoundcodesD,E,andF）
1-7DrawthestructuralformulaofcompoundH：
1-8Answerformultiplechoicequestion：
2-1DrawthestructuralformulaofcompoundA.
2-2TorF
（a）OsO4isanoxidizingagentinthereactionofAtoB.
（b）MeOHisgeneratedasaby-productinthereactionofBtoC.
（c）ProtonsactasthecatalystinthetransformationofBtoC.
（d）CwillstillbeformedalbeitinloweryieldsintheabsenceofMe2C（OMe）2
2-3D/Eratiobeforerecrystallization：
Showyourworkhere
TorF
（a）ThereactionwastooxidizecompoundF.
（b）TheoxygenatominsertedoriginatedfromMCPBA.
（c）TheR/SnotationofC-1remainedunchangedbeforeandafterthereaction.
2-5DrawtheconfigurationalformulaofcompoundH.
2-5Giveyouranswersasfollows
C-1：
；
C-2：
C-3：
C-4：
.
2-8Thenumberofdiastereoisomersofpentasaccharideis：
3-1DrawthestructuralformulaofCandD
3-2Answerformultiplechoicequestion：
3-3Answerformultiplechoicequestion：
3-4Answerformultiplechoicequestion：
3-5DrawthestructuralformulaofcompoundH
3-6（cisortrans）
3-7（Answerformultiplechoicequestion）
3-8（Answerformultiplechoicequestion）
4A-1DrawastructureforAu（CN）2-
4A-2WeightforKCN：
g
Showyourworkhere
4A-3
4A-4oxidizingagent：
reducingagent：
4A-5FormationconstantK：
Showyourcalculationshere
4A-6Answerformultiplechoicequestion：
4B-1Answerformultiplechoicequestion：
4B-2Answerformultiplechoicequestion：
4B-3Answerformultiplechoicequestion：
4B-4Answerformultiplechoicequestion：
Showyourworkhere
4B-5Answerformultiplechoicequestion：
Answerformultiplechoicequestion5-4a：
Answerformultiplechoicequestion5-4b：
Answerformultiplechoicequestion5-4c：
6-1[H2CO3]：
[HCO3-]：
[CO32-]=：
1.00：
（a）（b）
KineticBehaviorofOzone
8-4Answerformultiplechoicequestion：
8-5Answerformultiplechoicequestion：
8-6
8-7
Country:
Name:
Experiment1
TheSynthesisofD,L-PhenylglycineandItsOpticalResolution
TotalScores:
100points
25
15
30
100
Step1.Preparationof（D,L）-phenylglycine
1-1Confirmedandsigned
bylabassistant
Weightofbenzoylformicacidused:
g
Weightoffrittedglassfunnel:
Aftercompletedryness:
Productweight+frittedglassfunnel:
[Weighonabalancethatreadstothenearestcentigram（0.01g）].
WeightofD,L-phenylglycineobtained:
Chemicalyield:
%
Calculatethechemicalyield（%yield;
showthecalculations）.
Recommendedscoringstandard:
g/
Wewilldoublecheckthecalculations,5pointswillbetakenoffforthewrongcalculations.Pointswillbegivenbasedonthecorrectchemicalyield.
Turninthesample（inthevialwithbluelabel）.
Signatureofstudent:
Signatureofthelabassistant:
[Theorganizationcommitteewillweighanappropriateamountofsample（0.01g）for1HNMRspectroscopicanalysis.]
Impuritymaycomefromtheammoniumformateandunknownsideproducts.Fromourpilotstudies,moststudentswillbeabletoget15points.
Step2.OpticalresolutionofD,L-phenylglycineby（+）-camphorsulfonicacid[（+）-CSA]
1-3Confirmedandsigned
WeightofD,L-phenylglycineused:
Weightoftheresolvedphenylglycine•（+）-CSAsalt:
g
%
Drawthecorrectconfigurationformula（stereochemicalstructure）oftheisolatedphenylglycine.
Ifonlycorrectchemicalstructureisgiven（nostereochemistry）,1pointisgiven.
Specificrotationoftheenantiomericphenylglycine•（+）CSAsalt（tobedeterminedbytheorganizationcommittee）
Turninthesample（inthevialwithpinklabel）.
[Theorganizationcommitteewillweighanappropriateamountofsample（0.055~0.065g）formeasurementofopticalpurity.]
Theorganizationcommitteewillweightheresolvedproduct（fromthefrittedglassfunnel）forstudentswhofailtofinishtheprocedureintime.However,15penaltypointswillbetaken.
Experiment2
IdentificationofUnknownInorganicSamples
96
UnknownCodeUnknownCodeUnknownCode
CompoundNumber**CompoundNumber**CompoundNumber**
HCl,H2SO4,NH4SCN,
NaOH,BaCl2,K4SCN,
Na2CO3,ZnCl2,
Na2CO3,H2O2,
**Secondcolumnisforduplicates.
A.WritetheelectrolysisequationthatwouldhelpyouconfirmthatanunknownsampleisZnCl2.
Zn2+（aq）+2Cl—（aq）→Cl2（aq）（anode）+Zn（s）（depositoncathode）
B.WriteoneequationthatshowshowtocleanthedepositofZnontheelectrode（limitedtotheitemsprovidedinthistask）.
Zn（s）+2H+（aq）→H2（g）+Zn2+（aq）
orZn（s）+2OH－（aq）→H2（g）+ZnO22――（aq）
Language:
37thIChOTheoreticalExamination
-useonlythepenprovided
-time
5hours
-problembooklet
26pages（includingthiscoversheet）
-answersheets:
28pages（includingcoversheet,andfivespagesattheendwithonlyabox.Useifnecessary.Writedowntheproblemnumberinsidethebox
-draftpaper（willnotbemarked）:
5sheets（moreareavailableonrequest）
-totalnumberofpoints:
279（Theyareequallyweightedinthefinalscore）
-yournameandstudentcode
writeoneveryanswersheet
-atomicmasses
useonlytheperiodicsystemgiven
-constants
useonlythevaluesgiveninthetable
-answers
onlyintheappropriateboxesoftheanswersheets.
Nothingelsewill
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