Module5ALessoninaLab有两种变化：化学变化和物理变化，那么你知道化学变化和物理变化的区别吗？ChemicalChangeandPhysicalChangeTherearetwokindsofchange－chemicalchangeandphysicalchange.Inachemicalchange,thereisalwaysanewsubstanceformed.Breakingupwaterintohydrogenandoxygenisachemicalchange.Ineachofthechemicalchangeatleastonenewsubstanceisformed.Achangeisnotachemicalchangeifitdoesn'tformanewsubstance.Physicalchangesareverycommon,too.Therearemanyexamples.Youcanmakeaphysicalchangebytearingapieceofpaperintotwo,orbycuttingapieceofironwithalathe.Herethepaperisstillpaper,andtheironisstilliron.Anotherwayofmakingphysicalchangeisdissolvingsomethinginwater.Whenyoudissolvesaltinwater,thesaltdisappears.Youmaythinkthatanewsubstancehasbeenformed.Butinfactthereisnonewsubstance.Thesaltisstillsalt.Youcanstilltasteit.Sothedissolvingofanythingisaphysicalchange.Whenwaterfreezes,thechangeisalsoaphysicalone.Thewaterchangesfromliquidtosolid.Butitisstillthesamesubstance.Thatiswhythefreezingofanythingisaphysicalchange.Andpeopleoftentellthedifferencesbetweenachemicalchangeandaphysicalchangethroughsomeexperiments.Weshouldtrytoexplorethemagicalscienceworldbydoingexperimentsbyourselves.[阅读障碍词]1．hydrogenn．氢气2．tearv．撕扯3．lathen．车床4．freezev．结冰；冷冻5．magicaladj.魔力的[诱思导读]根据短文内容，判断正误(T/F)1．Inachemicalchange,thereisalwaysanewsubstanceformed.(T)2．Breakingupwaterintohydrogenandoxygenisaphysicalchange.(F)3．Waterchangingfromliquidtosolidisachemicalchange.(F)SectionⅠWarmingUp,Prereading&ReadingⅠ.匹配下列单词的词性及汉语意思()1.expandA．n.电()2.mixtureB．n.结论()3.electricityC．n.混合物()4.conclusionD．n.目标；目的()5.aimE．n.设备；装备()6.reactF．vi.形成()7.equipmentG．vi.漂浮()8.ordinaryH．vi.(化学)反应()9.floatI．vi.膨胀()10.formJ．adj.普通的；平常的[答案]1－5ICABD6－10HEJGFⅡ.选择下列句中词组的汉语意思A．想出；考虑B．将……按顺序排列C．弄清楚，查明D．在底端E．往……加入……F．把……关在外面1．Doyouwanttoaddyournametothelist？2．Shelikestoputeverythinginorderindailylife.3．Closethedoorandkeepthecoldairoutoftheroom.4．Canyouthinkofanyotherwaytoworkouttheproblem？5．Theanswerisatthebottomofthepage.Haveyoufoundit？6．Theteacherwasveryangrywhenhefoundoutthatthestudenthadbeenlying.[答案]1－6EBFADCPassageAItishardtothinkofaworldwithoutmetals.①Differentmetalshavedifferentuses,forexample,steelisusedincars,andironisusedinelectricalequipment.Whenweusemetals,itisimportanttoknowhowtheyreactwithdifferentsubstances②，forexample,waterandoxygen.Thereactionofmetalswiththesesubstancescanbeputinorder.Hereisatablewiththemetalsthatreactmostatthetop③，andthemetalsthatreactleastatthebottom.A篇很难想象一个没有金属的世界。不同的金属有不同的用途，比如，钢用来造车，铁用来造电力设备。使用金属时，要了解金属和不同的物质(例如水和氧)如何发生反应，这一点很重要。(不同的)金属与这些物质的反应程度可以按顺序排列起来。下面表格中的金属反应最强烈的排在上面，反应最弱的排在下面。[助读讲解]①Itishardto...中it是形式主语，真正的主语是tothinkof...。②Whenweusemetals是when引导的时间状语从句，主句是itisimportantto...，其中it是形式主语，动词不定式toknow...是真正的主语，而howtheyreactwithdifferentsubstances是宾语从句，作know的宾语。③thatreactmostatthetop是that引导的定语从句，修饰先行词metals。MetalHeatedinoxygenReactionwithwaterorsteamPotassiumBurnstoformanoxideReactingwithcoldwaterSodiumCalciumMagnesiumReactingwithst...
