Unit 5 Look into Science Lesson 26 Keep the Candle Burning课件(共21张PPT) 冀教版九年级全一册

(共21张PPT)
Unit 5
Lesson 26
Keep the Candle Burning
1.学习目标
3.重点探究
2.自主学习
学习导航
5.当堂检测
6.课堂总结
4.拓展提升
新课导入
Do you like doing science experiments
Why or why not
Guess what will happen from the picture
学习目标
1.掌握本课新单词：shallow oxygen candle hoider burning.
掌握本课短语：use up , put on,in front of
2.能够听懂用动词原形开头来讲述句子,并掌握如何做成实验的正确用语
3.能用英语描述各个仪器的用途，以及实验过程
自主学习
holder [ h ld (r)] n. 持有者; 支持物
I screwed the lamp back in its holder.
我把灯拧回到了灯座上。
lighter [ la t (r)]
n. 打火机; 点火器; 点火者; 驳船;
shallow [ l ]
adj. 浅的，肤浅的; 表面的，皮毛的; （水） 浅
Put the milk in a shallow dish.
将牛奶倒入一个浅盘里。
matches ['m t z]
n. 火柴; 比赛（ match的名词复数 ）; 对手; 相配的人（或物）;
e.g.Our team won three matches, drew one and lost two.
examine [ g z m n]
vt. 检查，调查; 考试; 诊察; 审问;
vi. 检查; 调查;
e.g.He examined the cat carefully.
oxygen [ ks d n]
n. [化] 氧，氧气;
e.g. They are breathing pure oxygen.
他们在呼吸纯净的氧气。
重点探究
Can you see the candle holder in this picture The candle is pink. The candle holder is grey. The candle holder is “holding” the candle!
What do you need
a candle
a candle holder
a big glass jar
a shallow dish
some water
a lighter or matches
What do you do
l. Put the candle in the candle holder.
2. Put the candle holder 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
What is happening
As the candle burns, it uses the oxygen in the air. When the candle stops burning, it has used up all the oxygen in the air. The water inside the jar rises. How far does the water rise Becase about one fifth of the air is made up of oxygen, the water rises and fills about one fifth of the jar.
Can you do this experiment
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 untilthe top of the jar rests on the dish. As the candle burns, it ______ the oxygen in the air. Whenthe candle stops ________, it has used up allthe oxygen in the air. The water inside the jar ______ and fills about ________ of the jar. This is because
about one fifth of the air ismade up of oxygen.
match
1 Read the lesson and fill in the blanks.
Let
uses
burning
rises
one fifth
Let's Do It!
Let's Do It!
1. Don't (use up/push up) all of the ink. Leave some for me.
2. The medical team (is made of/is made up of) five experienced doctors.
3. Please fill the hole (with/in) sand and water.
4. They didn't realize their mistake (until/as) we told them.
5. My brother wasn't (strong enough/enough strong) to lift the box.
2 Circle the correct words to complete the sentences.
SCIENCE THAT'S INTERESTING!
Read about the experiment in this lesson. With
a group of classmates,practice the experiment.
Do your experiment in front of the class.
Don't forget the following things：
First,describe your experiment.
Second,ask the class what they think will happen.
Third,do the experiment.
Finally,ask the class if the result is what they expected.
拓展提升
1.Science is so interesting!
◆so为副词,意为“这样,如此”,用于修饰形容词或副词的原级,表示程度。常见用法如下:
(1)“so+形容词+a/an+单数名词”相当于“such a/an+形容词+单数名词”。
(2)so后可接many,much,few和little来表示名词的数量。
(3)so…that…意为“如此……以至于……”,构成结果状语从句。
◆interesting为形容词,意为“有趣的”,表示事物本身含有令人感兴趣的因素,可作表语或定语,用于说明物。
【拓展】　interested也为形容词,意为“感兴趣的”,表示人对物的感受,在句中可作表语,常用于固定短语be/get interested in“对……感兴趣”。
2.Fill the dish half full with water.
half full with water为形容词短语,在句中作状语,表伴随状态。
3.Light the candle.
light为动词,意为“点燃”,可构成短语light up“点(烟),照亮”,宾语为代词时,应放在light与up之间。light的过去式和过去分词为lighted/lit,lighted/lit。
【拓展】　
(1)light作名词时,意为“灯,光”。
(2)light作形容词时,意为“轻的,浅的”。
4.Carefully put the jar over the candle until the top of the jar rests on the dish.
carefully为副词,意为“细心地,认真地”,其形容词形式为careful,意为“小心的”。care可用作动词,意为“关心”,也可用作名词,意为“照顾”。
5.When the candle stops burning, it has used up all the oxygen in the air.
use up意为“用完,用光”,为“动词+副词”构成的短语。这类短语用名词作宾语时,名词可用在副词前,也可放在副词后;用代词作宾语时,代词则必须放在副词前,该短语相当于run out of…,可用于被动语态。
6.The water inside the jar rises.
rise为不及物动词,意为“升起,上升”,其过去式和过去分词分别为rose,risen。rise多用于表示日月星辰的升起、河水或物价上涨等方面。
7.Because about one fifth of the air is made up of oxygen, the water rises and fills about one fifth of the jar.
◆one fifth意为“五分之一”,这是一个分数。分数的表达一般遵循以下规则:分子用基数词,分母用序数词;当分子大于一时,分母要用复数形式;并且其中的连词符号有时可以省略。
【注意】　分数后面跟of短语作主语时,谓语动词的单复数由of后面的名词的单复数决定。
◆be made up of意为“由……组成”,表示由多种成分、团体、成员或单位等组成,并强调整体的构成或组成。
当堂检测
一、用所给单词的正确形式填空。
1. You are very tired. You’d better stop __________ (have) a rest.
2. What do you use to make a candle _________ (burn)
3. You should put the jar over the candle ___________ (careful).
4. What _______________ (observe) can you make
to have
burn
carefully
observation(s)
二、连词成句。
1.should，the，keep，clean，bedroom，we(.)
_______________________________________________
2.nations, up, our, made, country, is, of, 56(.)
_______________________________________________
3.far，water，rise，how，does，the(？)
_______________________________________________
4.sure，will，the，pass，exam，you，I’m(.)
_______________________________________________
5.is, beautiful, lighter, your, expensive, and, how(！)
______________________________________________
How beautiful and expensive your lighter is!
Our country is made up of 56 nations.
We should keep the bedroom clean.
How far does the water rise 　
I’m sure you will pass the exam.
课堂总结
Unit 5
Lesson 26
1.掌握本课新单词：shallow oxygen candle hoider burning.
掌握本课短语：use up , put on,in front of
2.掌握如何做成实验的正确用语
3.能用英语描述各个仪器的用途，以及实验过程