Unit 5 Look into Science.Lesson 26 Keep the Candle Burning.课件

课件18张PPT。Welcome tomy class!What is happening ?The force of the air keeps the water in the jar. We have discovered that the air pressure helps the cardboard hold the water in the jar.Warming-upToday we are going to look into science again and learn to do another experiment.
What experiment will we do?Keep the Candle Burning!Keep the Candle BurningLearning aims and important pointsLearning Aims
1.Knowledge?Aims:
Master the words and phrases in this lesson
2.Ability?Aims:
Learn how to describe the science experiments
3.Emotion Aims:
Lead Ss to be interested in science research
Learning Important Points:
Describe (描述) and explain（解释） the experiment in English
a candle a candle holder a big glass jar a shallow dish with water matches oxygen What do we need?New words and phrases 1. Put the candle in the candle holder.2. Put the candle holder in the dish.4. Light the candle. How do we do the experiment?观
察
领
悟3. Fill the dish half full with water.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. Look at the water
in the jar. 观
察
领
悟Let’s do the experiment !First， put the candle in the candleholder.Second , put the candle holder in the dish.Third , fill the dish half full with water.Fourth , light the candle.Fifth ,let the candle burn for two or three minutes.Sixth , carefully put the jar over the candle until
the top of the jar rests on the dish.
Seventh, look at the water in the jar. 1. What makes the candle burn?
Oxygen .
make/let sth./sb. do
使某物/某做…….
Eg: Let the candle ____(burn) for two
or three minutes.
I make the student _____(go) out.
Language Points 课内探究burn go 2.Why did the candle stop burning? Is there any oxygen in the jar?Because it has used all the oxygen
in the air.
No ,there isn’t.
use up eat up drink up
Eg: I have ______ the water in the bottle.
He has _______ the bread.
She has _______ the water.
课 内 探 究Language points used up eaten updrunk up What is happening?阅读共品Listen to the tape .Then read “what is happening “in the text and think about the following questions.1.How far did the water rise?
2. Why does the water fill about one fifth of the jar? One fifth.1.How far did the water rise?口诀：
分子基数，分母序，分子 > 1 ,分母加 Sthree fourths three quartersone (a) quarter one fourthone thirda (one) half
one second (one-second)Think about it !总
结
提
高2. Why does the water fill about one fifth of the jar?Because about one fifth of the jar
is made up of oxygen.

Think about it !拓展延伸What does this experiment show
about air?
It proved (证明)that there is _______ oxygen in the air..one - fifth Discussing !拓展探究There are lots of matchs in the small box.
Can you let my uncle laughing?
There is about one–five oxygen in the air.
There are about two–third students in
the classroom.
5. I used out my money. Can you
lend me some?Correct the mistakes.matcheslaughone-fifthtwo-thirdsup当堂检测

Summary
New words: match, light, burn, shallow,
candleholder, oxygen
(2) Phrases: use up, one-fifth
(3) Sentences:
① Fill the dish half full of water.
② As the candle burns, it uses up oxygen
in the air.
Hom ework
1. Do and describe this experiment to your family.
2. Write the experiment that you have learned
in this unit.
Summary and Homework:Thank you,bye!