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1、i-01-LBL-8617678/23/042:24PMPageiPhotoDisci-01-LBL-8617678/23/042:24PMPageiiChemistryWaterdropletscondenseonthesurfaceofaflaskthathasbeencooledbyachemicalreaction.Achemicalchangeproducesnewsubstancesthathavepropertiesdifferentfromthoseoftheoriginalsubstances.Thechangeintemperatureisanindicationthata
2、chemicalreactionhastakenplace.Copyright©2005byTheMcGraw-HillCompanies,Inc.Allrightsreserved.ExceptaspermittedundertheUnitedStatesCopyrightAct,nopartofthispublicationmaybereproducedordistributedinanyformorbyanymeans,orstoredinadatabaseorretrievalsystem,withoutpriorwrittenpermissionofthepublisher.TheN
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4、ociety”andthe“ScienceandHistory”featuresthatappearinthisbookweredesignedanddevelopedbyTIMESchoolPublishing,adivisionofTIMEMagazine.TIMEandtheredborderaretrademarksofTimeInc.Allrightsreserved.Sendallinquiriesto:Glencoe/McGraw-Hill8787OrionPlaceColumbus,OH43240-4027ISBN:0-07-861767-7PrintedintheUnited
5、StatesofAmerica.2345678910027/111090807060504PhotoDisci-01-LBL-8617678/23/042:24PMPageiiiAuthorsEricWerwa,PhDDinahZikeDepartmentofPhysicsandEducationalConsultantEducationDivisionAstronomyDinah-MightActivities,Inc.Washington,D.C.OtterbeinCollegeSanAntonio,TXWesterville,OHSeriesConsultantsCONTENTREADI
6、NGACTIVITYTESTERSLindaMcGawRachelSwaters-KissingerNermaCoatsHendersonScienceProgramCoordinatorScienceTeacherPickeringtonLakeviewJr.HighAdvancedPlacementStrategies,Inc.JohnBoiseMiddleSchoolSchoolDallas,TXWarsaw,MOPickerington,OHMATHSAFETYMaryHelenMariscal-CholkaWilliamD.SliderMiddleSchoolMichaelHoppe
7、r,DEngAileenDuc,PhDElPaso,TXManagerofAircraftCertificationScience8TeacherL-3CommunicationsHendrickMiddleSchool,PlanoISDScienceKitandBorealGreenville,TXPlano,TXLaboratoriesTonawanda,NYSandraWest,PhDDep