九年级Lesson26Keep the candle burning.ppt

Welcometoourclass Doyoulikedoingscienceexperiments Why Haveyoudoneascienceexperiment Theyaredoingexperiments Lesson26KeeptheCandleBurning Burningneeds Experimentname Howmuchoxygenisthereintheair oxygen acandle acandleholder abigglassjar ashallowdish alighter matches somewater Putthecandleholderonthedish Examinethewaterinthejar Fillthedishhalffullwithwater Letthecandleburnfortwoorthreeminutes Putthecandleinthecandleholder Lightthecandle Carefullyputthejaroverthecandleuntilthetopofthejarrestsonthedish Listencarefullyandputthesentencesinthecorrectorder 2 7 3 5 1 4 6 burning match lighter Let until As uses used up one fifth is made up of rises WatchSayandFill First thecandle thecandleholder Second thecandleholder thedish Third thedish water Fourth thecandle Fifth thecandle fortwoorthreeminutes Howdowedotheexperiment put put on in fill halffullwith light let burn Imagineandpredict IfIputthejaroverthecandleuntilthetopofthejarrestsonthedish whatwillhappen I mnotsure I msure will v Ithink Maybe 9 可编辑 Whatobservationcanyoumake Thecandlestopsburning Thewaterrisesup Do Observeandanswer Sixth carefullyputthejaroverthecandleuntilthetopofthejarrestsonthedish Finally examinethewaterinthejar Whatcanyousee Discussing Whydidthecandlestopburning Whydidthewaterrise Howfardidthewaterrise Why Whatdoesthisexperimentshowaboutair Becauseithas theoxygenintheairandthereis oxygeninthejar Becausetheforceoutsidethejaris thantheforceinsidethejar Becausethereisabout oxygenintheair sothewaterrisesandfillsabout ofthejar Itprovedthatthereis oxygenintheair usedup no stronger one fifth one fifth one fifth GroupWork Task1 DoandspeakEnglishWorkingroups oneistodotheexperimentbyhimself othersdescribethestepsandtheconclusionoftheexperimentinEnglish 以小组形式做实验 并用英语叙述实验步骤和结论 Task2 Finishtheexperimentreport Whiledoingtheexperiment oneistowritetheexperimentreport Choseonestudenttocheckanothergroup 再选一名学生写实验报告单 一名学生做监督员 如果说汉语为失败 Name WhichGroup Date Howmuchoxygenisthereintheair acandle acandleholderabigglassjar ashallowdishsomewater matchesorlighter 1 Putthecandleinthecandleholder 2 Putthecandleholderonthedish 3 Fillthedishhalffullwithwater 4 lightthecandle 5 letthecandleburnfortwoorthreeminutes 6 carefullyputthejaroverthecandleuntilthetopofthejarrestsonthedish 7 Examinethewaterinthejar Thecandlestopsburning Thewaterrisesup Thereisonefifthoxygenintheair TryYourBest 名称 带电的报纸材料 一支铅笔一张报纸步骤 1 把报纸铺在墙上2 用铅笔的侧面在报纸上迅速摩擦3 把手慢慢移开 猜测会发生什么 4 报纸粘在了墙上5 慢慢地把报纸从墙上接下来 仔细听会有噼啪的静电声结论 铅笔和报纸摩擦产生静电 把报纸粘在墙上 提示 静电staticelectricity 摩擦rub产生produce first second third then finally Homework