o水准化学试题

《o水准化学试题》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

1、OLevelSpecimenPaper50721hoursChemistryPaper1READTHESEINSTRUCTIONSFIRSTWriteyournameonalltheworkyouhandin.Writeinsoftpencil.Writeyourname,CentrenumberandindexnumberontheAnswerSheetinthespacesprovidedunlesshishasbeendoneforyou.Answerallquestions・Foreachquestiontherearefou

2、rpossibleanswers・ChoosetheoneyouconsidercorrectandrecordyourchoiceinsoftpencilontheseparateAnswerSheet.Attheendoftheexamination,fastenallyourworksecurelytogether.Paper11ThediagramshowstheapparatususedtopreparealiquidcompoundL.coldwateruM+NheatCompoundL(boilingpoint57°C)

3、ismadebyheatingtogethertwoliquids,M(boilingpoint78°C)andN(boilingpoint95°C).Thereactionisslow.Whatisthepurposeofthecondenser?AtoallowliquidLtoescapeasfastasitisformedBtoenableMandNtomixmoreefficientlyCtokeepairawayfromthereactingliquidsDtopreventMandNfromescapingbeforet

4、hereactioniscomplete2Inwhichreactionisthesulphateionremovedfromsolution?ABaCZ2+H2SO4tBaSO4+2HCZB2NaOH+H2SO4->Na2SO4+2H2OCMg+H2SO4tMgSC)4+出DNa2CO3+H2SO4tNa2SO4+H2O+CO21Whichtwogaseseachchangethecolourofdampredlitmuspaper?AammoniaandchlorineBammoniaandhydrogenchlorideCcar

5、bondioxideandchlorineDcarbondioxideandsulphurdioxide2Thediagramshowsthearrangementoftheionsinanioniccrystal.keyO=+veion•=-veionWhichcompoundcannothavethisarrangementofitsions?Acalciumoxide,CaOBcopper(II)sulphate,CuSO4Cmagnesiumchloride,MgCZ2Dsodiumchloride,NaCZ3Thediagr

6、amshowsthestructureofacompoundofcarbonandsilicon,(SiC)n.•carbonatomOsiliconatomWhatwillbeapropertyof(SiC)n?AactsasalubricantBconductselectricityCinsolubleinwaterDlowmeltingpoint1Covalentbondsareformedwhenatomsshareelectrons・Howmanyelectronsareprovidedbyeachoftheatomsoft

7、heelementsoxygen,fluorineandcarbonwhentheyformcovalentcompounds?oxygenfluorinecarbonA123.B124C213D2142Thegraphshowsthechangeintemperaturewithtimewheniceat-20°Cisheatedto120°C.temperature/°CWhichentryinthetableshowsthecorrectchangetakingplacebetweenthepoints?pointschange

8、APtoQaverageenergyofparticlesremainsconstantBQtoRicemeltingCRtoSthevolumeofsteamisincreasingDTtoUwaterboiling3