欢迎来到天天文库
浏览记录
ID:31536393
大小:3.34 MB
页数:15页
时间:2019-01-13
《高中英语 module 5 a lesson in a lab section ⅰ introduction & reading-pre-reading教学案 外研版必修1》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、Module5ALessoninaLabSectionⅠIntroduction&Reading-Pre-readingTherearetwokindsofchange—chemicalchangeandphysicalchange.Inachemicalchange,thereisalwaysanewsubstanceformed.Breakingupwaterintohydrogen(氢气)andoxygenisachemicalchange.Ineachofthechemicalchangeatleastonenewsubstance(物质)isfor
2、med.Achangeisnotachemicalchangeifitdoesn’tformanewsubstance.Physicalchangesareverycommon,too.Therearemanyexamples.Youcanmakeaphysicalchangebytearing(撕扯)apieceofpaperintotwo,orbycuttingapieceofironwithalathe(车床).Herethepaperisstillpaper,andtheironisstilliron.Anotherwayofmakingphysicalch
3、angeisdissolving(溶解)somethinginwater.Whenyoudissolvesaltinwater,thesaltdisappears.Youmaythinkthatanewsubstancehasbeenformed.Butinfactthereisnonewsubstance.Thesaltisstillsalt.Youcanstilltasteit.Sothedissolvingofanythingisaphysicalchange.Whenwaterfreezes,thechangeisalsoaphysicalone.Thewa
4、terchangesfromliquidtosolid.Butitisstillthesamesubstance.Thatiswhythefreezingof非常感谢上级领导对我的信任,这次安排我向股份公司述职,既是对我履行职责的监督,也是对我个人的关心和爱护,更是对**百联东方商厦有限公司工作的高度重视和支持。anythingisaphysicalchange.Andpeopleoftentellthedifferencesbetweenachemicalchangeandaphysicalchangethroughsomeexperiments.Inthismo
5、dule,let’sexplorethemagicalscienceworldbydoingexperimentsbyourselves.Section_ⅠIntroduction&Reading—Prereading,PassageAIt’shardtothinkofaworldwithoutmetals①.Differentmetalshavedifferentuses②,forexample,steelisusedincars,andironisusedinelectrical③equipment④.Whenweusemetals,itisimportantt
6、oknowhowtheyreactwithdifferentsubstances⑤,forexample,waterandoxygen⑥.Thereaction⑦ofmetalswiththesesubstancescanbeputinorder⑧.Hereisatablewiththemetals⑨thatreactmostatthetop,andthemetalsthatreactleastatthebottom⑪.MetalHeatedinoxygenReactionwithwaterorsteam⑮PotassiumBurnstoform⑫anoxide⑬R
7、eactingwithcoldwaterSodiumCalciumMagnesiumReactingwithsteam AluminiumZincIronReactsslowlyPartialreactionCopperPartial⑭reactionNoreaction*anoxide=anothersubstance+oxygen①thinkof想出;想象句中it是形式主语,真正的主语是tothinkof...②usen.用途;功能,此处为可数名词。③electrical/I’lektrIkl/adj.与电有关的;用电的④equipment/I’kwIpmə
此文档下载收益归作者所有