1、TodayTodays encouraging notess encouraging notesWhen you are your own teacher,the world is your classroom.I can do it!You can do it!We can do it!Dont be shy Just try!KeeptheCandleBurning!By:Guan WeihaiLesson 26 1.What do we need to do the experiment?a candlea candleholdera big glass jara shallow dis
2、h with watera matchmatches 2.How do we do the experiment?1)Put the candle in the candleholder.2)Put the candleholder in the dish.3)Fill the dish half full of water.4)Light the candle.5)Let the candle burn for two or three minutes.6)Carefully put the jar over the candle until the top of the jar rests
3、 on the dish.Put the candle in the candleholder.Put the candleholder in the dish.Fill the dish half full of water.Light the candle.Now the candle is burning.Let the candle burn for two or three minutes.Carefully put the jar over the candle until the top of the jar rests on the dish.Carefully put the
4、 jar over the candle until the top of the jar rests on the dish.The water rises and fills about one-fifth of the jar.3.What is happening?1).Why did the air rise?When the candle stops burning,it has used up all the oxygen in the air.the water inside the jar then rise.2).How far did the water rise?Abo
5、ut one-fifthFill in the blanks.Lets do an experiment.First find a _ and then put it in the _,and then put them in the _._the dish _full of water.After that,we can _the candle.Let the candle _for two or three minutes.At last put the jar _the candle.What can we see?As the candle burns,it _up oxygen in
6、 the air.When the candle stops _,it has used up all the oxygen.The water inside the jar rises about _.candlecandleholderdishFillhalflightburningoverusesburningone-fifthProject Practise another experiment you like after class,tomorrow,do it for the class.Dont forget to:First,describe your experiment.
7、Second,ask the class to guess what will happen Third,do the experiment.Describe the experiment as you do it.Fourth,ask the class what happens.Finally,try to draw a true conclusion.Todays Journal Topic If you want to be a scientist,what should you do now?Blackboard Design1.What do we need to do the experiment?2.How do we do the experiment?3.What is happening?Summary and Homeworknn 1.Read the text aloud and recite the part of “What is happening?”nn 2.Do the experiment after class by yourselves.nn 3.Preview Lesson 31.Class is overThank you!
