IGCSE真题_20140116

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1、WriteyournamehereSurnameOthernamesCentreNumberCandidateNumberPearsonEdexcelCertificatePearsonEdexcelInternationalGCSEChemistryUnit:KCH0/4CH0Paper:2CThursday16January2014–AfternoonPaperReferenceKCH0/2CTime:1hour4CH0/2CYoumusthave:TotalMarksRulerCalculatorInstructionsíUseblackinkorball-pointp

2、en.íFillintheboxesatthetopofthispagewithyourname,centrenumberandcandidatenumber.íAnswerallquestions.íAnswerthequestionsinthespacesprovided–theremaybemorespacethanyouneed.íShowallthestepsinanycalculationsandstatetheunits.íSomequestionsmustbeansweredwithacrossinabox().Ifyouchangeyourmindabout

3、ananswer,putalinethroughthebox()andthenmarkyournewanswerwithacross().InformationíThetotalmarkforthispaperis60.íThemarksforeachquestionareshowninbrackets–usethisasaguideastohowmuchtimetospendoneachquestion.AdviceíReadeachquestioncarefullybeforeyoustarttoanswerit.íKeepaneyeonthetime.íWriteyou

4、ranswersneatlyandingoodEnglish.íTrytoanswereveryquestion.íCheckyouranswersifyouhavetimeattheend.TurnoverP42864A*P42864A0120*©2014PearsonEducationLtd.1/1/1/1/2*P42864A0220*BLANKPAGE3*P42864A0320*TurnoverAnswerALLquestions.1Thetableshowsthenumbersofparticlesintwoatoms,LandM.AtomLAtomMnumberof

5、electrons66numberofneutrons86numberofprotons66(a)Whichparticlesarepresentinthenucleiofbothatoms?(1)AelectronsandneutronsBelectronsandprotonsCneutronsandprotonsDneutrons,protonsandelectrons(b)(i)TheatomicnumberofatomLis...................................(1)(ii)ThemassnumberofatomLis.........

6、..........................(1)(c)AtomsLandMareneutralbecause(1)AthenumbersofelectronsandneutronsareequalBthenumbersofelectronsandprotonsareequalCthenumbersofneutronsandprotonsareequalDthenumbersofelectrons,neutronsandprotonsareequal4*P42864A0420*(d)Useinformationfromthetabletoexplainwhyatoms

7、LandMareisotopesofthesameelement.(2)..........................................................................................................................................................................................................................