A lesson in a lab Reading(课堂PPT)

Reading,2,Whatcanyouseeinthesepictures?,3,B.aim,D.method,A.result,C.conclusion,C,Thestepsofascientificexperiment,Readthepassageasquicklyasyoucanandchoosethebesttitleforit.,TheDifferentUsesofMetalsTheReactionofMetalsTheReactionofMetalswithOxygen,PassageA,Readthepassageagainandanswerthefollowingquestions:,1.Whichofthemetalsinthetablereactsthemostwithoxygenandwater?Potassium,calciumandsodium.2.Whathappenswhenyouheatcalciuminoxygen?Itburnstoformanoxide.,3.Whichmetalsreactwithsteam?Magnesium,aluminiumandzinc.4.Doesironhaveasloworfastreactionwithsteam?Ithasaslowreaction.5.Doescopperreactwithwater?No,itdoesnt.,7,CompletethepassagewithproperwordsaccordingtopassageA.Metalsareveryimportant,sowhenusingthemweshouldknowhowthey_withdifferentsubstances.Takeironusedin_equipmentforexample,when_inoxygen,itwillreactslowly.Whenitisputtogetherwithwateror_,therewillbeapartial_.,reaction,react,electrical,heated,steam,Readthepassageandfillinthechart.,PassageB,cottonwool,water,water,nails,water,Irondoesnotrust,Irondoesnotrust,Ironrusts,1.Inthefirstpartoftheexperiment,the_isdry,notwet.2.Itshowsthatiron_whentheairisdry.3.Inthesecondpartoftheexperiment,youmust_thewatertomakesurethereisno_init.,air,doesnotrust,boil,air,Readthepassageagainandcompletethesentences.,11,4.Youadd_tothewaterbecausethiskeeps_outofit.5.Itshowsthat_doesnotrustinwaterthathasno_init.,someoil,air,nail,air,CompletethepassagewithproperwordsaccordingtoPassageAandB.,Itishardtothinkofaworldwithoutmetals.Differentmetalshavedifferentuses,forexample,ironcanbeusedin_equipment.Butaboveallweshouldknowwhetheritwill_under,electrical,react,differentconditions.Otherwiseitwillkeeptheequipmentfromworkingwell.Asweallknow,ifironisheatedinoxygen,itwillreactslowlybutwillnotforman_.,oxide,Ontheotherhand,ifitisputtogetherwithwateror_,therewillbea_reaction.Nextletsdoan_tosupporttheabove.First,getatesttubefilledwithwaterandputitoverthe_to_forthreeminutes.,steam,partial,experiment,Bunsenburner,boil,15,Thenputthreeorfourcleannailsinthewaterwithsomeoiladdedtoitandleavethetubeforoneweek.Whathappens?Theirondoesnot_inair-freewater.Anotherexperiment,ifyouputthenailsinthetubewiththeairinitforoneweek,thenwhathappens?Ironrustsin_water.,rust,ordinary,16,1.Whenweusemetals,itisimportanttoknowhowtheyreactwithdifferentsubstances,forexample,waterandoxygen.=Whenweusemetals,weshouldknowhowmetalsreactwithdifferentsubstances,forexample,waterandoxygen,whichisveryimportant.,Difficultsentences,17,本句是一个复合句，其中when引导时间状语从句；在主句中，it为形式主语，真正的主语是动词不定式短语toknow.substances，其中how.substances为how引导的宾语从句，作know的宾语，forexample引出同位语，表示举例。,18,2.Hereisatablewiththemetalsthatreactmostatthetop,andthemetalsthatreactleastatthebottom.=Atableishere.Atthetopofthetablewecanseethemetalsthatreactmostandatthebottomofthetablewecanseemetalsthatreactleast.,19,本句使用了倒装语序。句子的主语是atable，后面的wit