Lesson-30-Keep-the-Candle-Burning-课件

Lesson30KeeptheCandleBurningListenandUnderstandLastweekwedidascientificexperiment.Itprovedthatourguessingorthoeryisrightorwrong.Ittellsusthattheairhasenoughforcetoholdthewater.Doyouthinkscienceisinteresting?Why?Becauseitmakesussurprised.Itchangesourwrongideas.Scienceissointerestingandweird!LoveScienceandScientistsWelovescience.Butweloveourscientistsbetter.Theyworkhardandhard.Theydosomanyscientificexperiments.Theyopenalotofsecretsoftheworld.Howgreatthescientistsare!CanyounameoneortwofamousChinesescientists?Todaywe’lldoanotherscientificexperiment.I’msureyou’lllikeit.Howshallwedoit?Whatwillittellus?NowLet’sstartLesson3o:KeeptheCandleBurningLookandLearn1.MatchesTheyareusedtolightsomething.Iwillusethemtolightacandle.Iamlightingthecandlewiththematch.Myfatheroftenusesmatchestolighthissmoke.Thisafternoonwe’llhaveabasketballmatch.LookandLearn-----Becauseburningneedsoxygen.whenthecandlestopsbuirning,ithasusedupalltheoxygeninthejar.(useup:Theyhaveusedupallthewater.)2.AcandleIt’saburningcandle.IfIputthejarovertheburningcandle,whatwillhappen?----Itwillgoout/stopburning.why?LookandLearn4.acandleholderItisusedtoputacandle.Itlookslikealilltlecup.3.AdishIt’sashallowdishThedishisshallow.Theriverisshallow,youcanwalkpast.ajarIt’sabigglassjar.Look,there’ssomewaterinthejar.Howmuchwater?Lookandlearn------It’saboutone-fifthofthejar.What’sthefour-fifthsofthejar?Thetwo–thirdsofthestudentslikeEnglishinourclass.Buttheone-thirdofthestudentsdon’tlikeEnglish.-----It’sairComepareandFindOne-fifthfour–fifthsone-thirdtwo-thirds分数表达法分子基分母序分子大于1分母加S1/54/51/32/3基数词序数词分子分母5/9Practise1/4one-fourth3/7three-seventhsLookandAnswerWhatdoweneedtodotheexperiment?Weneedacandle.acandleholderabigglassjar.ashallowwithwatermatchesWatchSayandFillFirst._____thecandle____thecandleholder.Then._____thecandleholder____thedish.Third._____thedish___________water.Fourth.______thecandle.Fifth.______thecandle______fortwominutes..HowdowedotheexperimentputputininFillhalffullofLightletburnImagineandpredictIfIputthejaroverthecandleuntilthetopofthejarrestsonthedishwhatwillhappen?I’mnotsure…I’msure…will+v…Ithink…Maybe……Do,ObserveandanwserSixth.carefullyputthejaroverthecandle.Andanswerthequestions.Whatobservationcanyoumake?Whatishappening?Whatdoyoudsiscovered?_____1)Thecandlestoppedburning.______2)Thewaterinthejarrose.ThinkReadandAnwser1.Whydidthecandlestopburning?becausetherewas___oxygeninthejar.2.Whydidthewaterrise?Theforceinsidethejaris______thantheforceinsidethejar.3.Howfardidthewaterrise?Why?Itroseabout____________ofthejar.Becausethereisone-fifthoxygeninthe_____.nostrongerone-fifthairToday,welearnedafewnewwordsandPhrases.Theyarecandlholder,match,oxygenshallow,light,burn,useupandone-fifth.Wedidaweirdexperiment.ItProvedthatthereisone-fifthoxygenintheair.Everyonestudiedhard,Youusedyourheadstoanswermyquestions.I’mverygladtobeyourteacher.SummariseandarrangehomeworkeAfterclass,Pleasepracticetheexperiment.Asyoudoit,describeitinEnglish.Nextclassyouwilldoyourexperimentfortheclass.PleasedoExercises3and6inyourschoolexercise-books.TheotherexercisesisyourhomeworkThankyou,everyoneSeeyounexttimeThankyou,everyoneSeeyounexttime