香港理工大学生化学试题.docx
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香港理工大学生化学试题.docx
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香港理工大学生化学试题
TheHongKong
POLYTECHNICUNIVERSITY香港理工大學
SecondarySchoolMathematics&ScienceCompetition2018
Chemistry
Date:
26April,2018Totalno.ofpages:
15
Timeallowed:
12:
00-1:
15pm(1hour15minutes)Totalmarks:
60
1.WriteyourCandidateNumber,ExamCentreNumber,SeatNumber,NameinEnglish,NameofSchool,Form,LanguageandSubjectinthespacesprovidedonthePartAMCAnswerSheetandthePartBAnswerSheet.
2.Whentoldtoopenthisquestionpaper,youshouldcheckthatallthequestionsarethere.Lookforthewords‘ENDOFPAPER’afterthelastquestion.
3.AnswerALLquestionsinPartA(40marks)
(a)YouareadvisedtouseanHBpenciltomarkallyouranswersontheMCAnswerSheet.
(b)Eachquestioncarriesonemark.
(c)YoushouldmarkonlyONEanswerforeachquestion.Ifyoumarkmorethanoneanswer,youwillreceiveNOMARKforthatquestion.
4.ThereareSIXquestionsinPartB(20marks).AnswerANYFIVEquestions.AnswersshouldbewritteninthespaceprovidedonthePartBAnswerSheet.
5.APeriodicTableisprovidedonthelastpageofthequestionpaper.
6.Nomarkwillbedeductedforwronganswers.
7.Thediagramsinthispaperarenotnecessarilydrawntoscale.
©TheHongKongPolytechnicUniversity2018AllRightsReserved
PartA:
MultipleChoiceQuestions(40marks)
1)WhenafewpiecesofcopperisslowlyaddedtoacolourlesssolutionX,thesolutionturnsblueslowly.Xmightbe
))))
((((
dilutesilvernitratesolution.concentratedhydrochloricacid.dilutesulphuricacid.concentratedsodiumchloridesolution.
A)
(1)only
B)(3)only
C)
(2)and(3)only
D)(3)and(4)only
2)ElementAformstwooxideswithchemicalformulaeAO2andA2O3respectively.IftwomolesofAO2containxnumberofatoms,thenonemoleofA2O3wouldcontain
A)3xatoms.
B)5xatoms.
C)6xatoms.
D)5xatoms.
3)Rubidium(Rb)isagroupIelement.WhichofthefollowingstatementsaboutRbare
CORRECT?
(1)Itcanreactwithsteamtogiveoutagas.
(2)Itismorereactivethansodium.
(3)Ithasalowermeltingpointthanthatofsodium.
A)
(1)and
(2)only
B)
(1)and(3)only
C)
(2)and(3)only
D)Alloftheabove
4)SubstanceXisasolidatroomtemperatureandoneatmosphericpressure.Initsmoltenstate,itconductselectricity.XmightNOTbe
A)lead(II)sulphate.
B)iodine.
C)zinc.
D)brass.
5)WhichofthefollowingstatementsdescribestheobservationCORRECTLYwhenbariumisputintodilutesulphuricacid?
A)Itgivesagaseousproductwhichturnslimewatermilky.
B)Itdissolvestogiveagreensolution.
C)Noobservablechange.
D)Whitesolidisformed.
6)Inanexperiment,excesszincgranulesareaddedtoasolutioncontainingsilverionsandaluminiumions.Aftercompletereaction,thereactionmixtureisfiltered.Whichofthefollowingstatement(s)concerningtheexperimentis/areCORRECT?
(1)Theresiduecontainsaluminiummetal.
(2)Theresiduecontainssilvermetal.
(3)Thefiltratecontainszincions.
A)
(1)only
B)
(2)only
C)
(1)and(3)only
D)
(2)and(3)only
7)Considerthefollowingreaction,
NH4HS(s)^NHs(g)+H2S(g)
333
Inareactionvesselof2.00dm,analysisshowedthat7.00x10-molesNH3(g),7.00x10-molesH^S(g)and0.693molesNH4HS(s)werepresentedattheequilibriummixture.Whatistheequilibriumconstantoftheabovereaction?
A)1.23x10-5mol2dm-6
B)3.55x10-5moldm-3
C)7.07x10-5mol2dm-6
D)4.90x10-5mol2dm-6
8)Considertheauto-ionizationofwateratequilibrium,
H2O(l)^H+(aq)+OH-(aq)AH°=+ve
Upondecreasingtemperature,whichofthefollowingisCORRECT?
A)ThepHrisesabove7andwaterbecomesalkaline.
B)ThepHrisesabove7andwaterstaysneutral.
C)ThepHdoesnotchangeandwaterstaysneutral.
D)ThepHdoesnotchangeandwaterbecomesalkaline.
9)
A)
B)
D)
Whichofthefollowinghazardwarninglabelsshouldbedisplayedinabottlecontainingcrudeoil?
10)Considertheinformationbelow:
Substance
Meltingpoint(oC)
Boilingpoint(oC)
W
10
90
X
-116
34
Y
16
118
Z
-138
0
Whichofthesubstancesintheabovetableareliquidsatroomtemperatureandpressure?
A)WandZonly
B)WandXonly
C)W,XandYonly
D)X,YandZonly
11)Amixtureofpotassiumhydrogencarbonateandcalciumcarbonateisbestseparatedbytheadditionof
A)water,followedbyfiltration.
B)limewater,followedbyevaporation.
C)diluteacid,followedbyevaporation.
D)silvernitratesolution,followedbyfiltration.
12)Considertheenthalpychangesofthefollowingreactions:
2NO2(g)
+
2H2O(g)
302(g)+N2H4(g)
AH=
=w
^N2(g)
+
O2(g)
NO2(g)
AH=
=x
H2(g)
+
^O2(g)
H2O(g)
AH=
=y
N2(g)
+
2H2(g)
—
N2H4(g)
AH=
=z
Whatistherelationshipbetweentheenthalpychangesw,x,yandz?
A)w=2x+2y-zb)w=x+y-2z
C)w=z-x+y
D)w=z-2x-2y
13)H2O2(aq)decomposesintoH2O(l)and02(g)inthepresenceofMnO2(s).Twoexperimentsareperformedtostudythisdecompositionreactionunderthesameconditions,exceptthat50mLof2MH2O2(aq)isusedinExperiment
(1),while100mLof1MH2O2(aq)isusedinExperiment
(2).WhichofthefollowingcombinationsisCORRECT?
TotalvolumeofO?
(g)formed
Experiment
(1)=Experiment
(2)Experiment
(1)>Experiment
(2)Experiment
(1)=Experiment
(2)Experiment
(1)>Experiment
(2)
RateofformationofO?
(g)atthestart
A)Experiment
(1)>Experiment
(2)
B)Experiment
(1)>Experiment
(2)
C)Experiment
(1)=Experiment
(2)
D)Experiment
(1)=Experiment
(2)
14)
A2(g)+B2(g)#2AB(g)whereKc:
[AB(g)]eqm2
[A2(g)]eqm[B2(g)l
eqm
Thefourdiagramsbelowrepresentamixtureofgasesatdifferenttimesatthesametemperature.Theequationofthereactionisshownbelow:
A)
B)
C)
D)
Whichofthefollowingdiagramshasthehighestvalueofreactionquotient?
15)
C)
OH
OH
HO
^—OHOH
D)
CompoundXisanorganiccompoundcontaininghydroxylgroup(s)whichcanbeoxidizedbystrongoxidizingagent(e.g.acidifiedpotassiumpermanganatesolution).WhichofthefollowingmoleculesisNOTcompoundX?
16)Considerthatsilverhasonlytwoisotopes,107Agand109Ag.WhichofthefollowingstatementsabouttheisotopesisINCORRECT?
A)Theycanreactwithoxygentoformoxide.
B)Therelativeabundanceof107Agis55%.
C)Theyhavethesamenumberofelectrons.
D)Theyformdifferentionswithdifferentcharge.
17)BiisGroupVelement.HowmanyelectronsareinBi3+?
A)80
B)86
C)206
D)212
18)WhichofthefollowingstatementsaboutammoniumionisINCORRECT?
A)Ithastetrahedralshape.
B)Totalnumberofelectronsintheammoniumionis8.
C)Theatomsarecovalentlybonded.
D)ItcanreactwithhotNaOHsolution.
19)Whichofthefollowinghasthestrongestmetallicbond?
A)Na
B)K
C)Ca
D)Cs
20)WhichofthefollowingdoesNOThaveagiantcovalentstructure?
A)Silicon
B)Graphite
C)Silicondioxide
D)C60
21)Arrangethefollowingmoleculesinascendingorderofboilingpoint:
H2O,H2SandH2Se
A)H2O B)H2O C)H2S D)H2S 22)Equalnumbersofmolesofpropanoicacidandethanolareheatedunderrefluxinthepresenceofconcentratedsulphuricacid.Whichofthefollowingstatement(s)concerningtheabovereactionis/areCORRECT? (1)Propanoicacid,ethanolandpropylethanoatearefoundinthereactionmixture. (2)Concentratedsulphuricacidincreasestherateofbackwardreaction. (3)Thelongerthetimeforreactionmixtureunderreflux,thehigheryieldoftheproductcanbeobtained. A) (2)only B)(3)only C) (1)and(3)only D) (2)and(3)only 23)WhenchlorinegasisbubbledintoanaqueoussolutionofacompoundX,thesolutionfirstturnsbrown,andthebrowncolourphasedouteventually.Xcouldbe A)silvernitrate. B)potassiumiodide. C)potassiumsulphite. D)sodiumbromide. 24)Whichofthefollowingsolutionswillformwhiteprecipitateswhenexcessammoniasolutionisadded? A)Iron(II)chloridesolution B)Nickel(II)chloridesolution C)Zincsulphatesolution D)Aluminiumsulphatesolution 25) A) B) C) D) ThemolecularformulaofanacidicgasisXY2.IftheAvogadro’sNumberisNamol-1,howmanymoleculesaretherein96gofXY2? (RelativeatomicmassofX: 32.0,Y: 16.0) 26)Whencarbondioxidegasispassedintowater,acolourlesssolutionisformed.WhichofthefollowingstatementsconcerningthesolutionareCORRECT? (1)Theelectricalconductivityofthesolutionisincreased. (2)Thesolutionturnsphenolphthaleincolourless. (3)Limestonewillbedissolvedinthesolution. A) (1)and (2)only B) (1)and(3)only C) (2)and(3)only D)Alloftheabove 27)0.800gH2Xisdissolvedinwatertoformasolutionwhichrequires25.0cmof0.500Msodiumhydroxidesolutionforcompleteneutralization.WhatistherelativeatomicmassofX? A)63.0b)64.0 C)126.0 D)128.0 28)Thefollowingequationrepresentsthereactionofbrominewithdilutesodiumhydroxidesolutionatroomtemperature: Br2(g)+2NaOH(aq)—NaBr(aq)+NaOBr(aq)+H2O(l) WhichofthefollowingstatementsconcerningthisreactionisCORRECT? A)Bromineisoxidizedandsodiumhydroxideisreduced. B)Bromineisreducedandsodiumhydroxideisoxidized. C)Bromineisservedasbothoxidizingagentandreducingagent. D)Sodiumhydroxideissimultaneouslyoxidizedandreduced. 29)Considerthefollowingset-upconnectedtoanammeter: copperelectrodeY concentratedcopper(ll)sulphatesolution glasswoolplug Intheset-up,electronsflowinsuchadirectionthattheconcentrationofCu2+(aq)ionsonbothsidesbecomesthesameeventually. Whichofthefollowingstatementsconcerningtheset-upareCORRECT? (1)Ele
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