L26_Keep_the_Candle_Burning课件

,Keep the Candle Burning!,By: Jia Chengxiang,Lesson 26,1. What do we need to do the experiment?,a candle,a candle holder,a big glass jar,a shallow dish with some water,a lighter,matches,2.How do we do the experiment?,Put the candle in the candle holder.,Put the candleholder on the dish.,Fill the dish half full with 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.,Examine the water in the jar. What can you see?,The water rises and fills about one-fifth of the jar.,Retelling the steps of the experiment,1) Put the candle in the candleholder.,2) Put the candleholder on the dish.,3) Fill the dish half full with 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 on the dish.7) Examine the water in the jar. What can you see?,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 rises. 2). How far did the water rise? About_ (五分之一)片段.shs,Fill in the blanks. Lets do an experiment. First find a _ and then put it in the _, and then put them on the _. _the dish _full with 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 the air. When the candle stops _,it has used up all the oxygen. The water inside the jar rises about _.,candle,candleholder,dish,Fill,half,light,burn,over,uses,burning,one-fifth,Todays Journal Topic,If I want to be a scientist, what should I do now? be hardworking never give up keep trying have a habit of lifelong learning . .,Summary and Homework,1. Read the text aloud and recite the part of “What is happening?”2. Do the experiment after class by yourselves.3. Preview Lesson 27.,Blackboard Design,1. What do we ne