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The candle will stop burning.
1. Listen and understand the experiment.
2. Learn to do the experiment by yourself.
3. Learn some useful words and expressions.
Study Objectives
预习检测
Read the lesson and fill in the blanks.
Let’s do the experiment together! Put the candle in the candle holder. Put the candle holder on the dish. Fill the dish half full with water. Light the candle with a______ or a lighter. What can you see? The candle is burning. _____ the candle burn for two or three minutes. Then carefully put the jar over it until the top of the jar rests on the dish. As the candle burns, it_____ the oxygen in the air. When the candle stops_________, it has uses up all the oxygen in the air. The water inside the jar_____ and fills about________ of the jar. This is because about one fifth of the air is made up of oxygen.
match
Let
uses
burning
rises
one fifth
质疑互动
1.Listen to the tape and read the text together.
2.Do the experiment in groups.
● Put the candle in the candle holder.
● Put the candle holder on the dish.
● Fill the dish half full with water.
● Light the candle.
● Let the candle burn for two or three minutes.
● Carefully put the jar over it until the top of the jar rests on the dish.
● Examine the water in the jar. What can you see?
3.Discuss and find out the key phrases.
1. When the candle stops burning, it has used up all the oxygen in the air.
当蜡烛停止燃烧时，它已经耗光了空气中的氧气。
use up 用尽；耗光
他已用完了所有的纸。
He has used up all the paper.