Module 5 A Lesson in a Lab Introduction and Vocabulary课件 (共42张PPT)

(共42张PPT)
Module 5
A lesson in a lab
Do you know them
Albert Einstein
Stephen hawking
Madam Curie
Alfred Nobel
Introduction and Vocabulary
Thomas Edison
Li Zhengdao
Charles Darwin
Newton
Match the following words.
1.physics
2.chemistry
3.biology
Alfred Nobel
Darwin
Li Zhengdao
Thomas Edison
Albert Einstein
Newton
Madam Curie
1.(a) Water exists as a solid, a liquid and a gas.
(b) Water exists as a solid and a liquid only.
2.(a) When you heat a metal, it expands.
(b) When you heat a metal, it contracts.
3.(a) Steel is a mixture of iron and other substances.
(b) Steel is a mixture of iron and oxygen.
4.(a) Two-thirds of the earth’s surface is water.
(b) 50% of the earth’s surface is water.
5.(a) The distance of the sun from the earth is 25.500 kms.
(b) The distance of the sun from the earth is 150,500,500 kms.
6.(a) The earth is 4.6 million years old.
(b) The earth is 4.6 billion years old.
7.(a) The earth is twice as large as the moon.
(b) The earth is forty-nine times larger than the moon.
Put the words in pairs or groups.
contract air earth gas liquid oxygen
moon solid expand sun
1
2
3
4
air – gas - oxygen
contract - expand
earth – sun - moon
gas – liquid - solid
opposite
heavenly
body
Put words in the right place.
electricity iron metal
steel air glass
natural
man-made
both
electricity iron air some metals
steel glass some metals
electricity some metals
英语中基数词、序数词、分数、小数和百分数的读法
How to say the cardinal numbers, the ordinal numbers, fraction, decimals and percent.
1.基数词的读法：
A. 先说“几十”， 再说“几”，中间用连字符。如：
23— 89—
B. 先说“几百”， 再加and,再加末两位数（或末位数）。如：
twenty-three
eighty-nine
two hundred and twenty-three
four hundred and sixteen
eight hundred and nine
223—
416—
809—
C. 1000以上的数先从后向前数，每三位数加一“,”（千分位）；第一个“,”号前为thousand; 第二个“,”号前为million; 第三个“,”号前为billion。如：
1,001—
4,000—
9,743—
174,301—
750,000,000—
one thousand and one
four thousand
nine thousand, seven hundred and forty-three
a (one) hundred and seventy-four thousand, three hundred and one
seven hundred and fifty million
序数词一般以与之相应的基数词加词尾-th构成，如：tenth（第十），但下面这些基数词在变序数词时， 有特别的地方。如：
2.序数词的读法
one — two —
three— five—
eight — nine—
twelve—
first
second
third
fifth
eighth
ninth
twelfth
We write
1/5
2/3
3/7
We say
one fifth
Fraction分数
表达法式：分子要用基数词，分母用序数词，如果分子大于一，分母必须用复数形式
two thirds
three sevenths
We write
We say
一些特殊的分数表达
1/4
1/2
3/4
a (one) quarter
a (one) half
three quarters
Decimals小数
We write
We say
0.5
2.5
18.27
zero point five/point five
eighteen point two seven
two point five
表达法式：小数点以前按基数词读出，若整数部分为0可读作zero或nought，也可以不读;小数点读作point;小数点后按基数词分别单个读出。小数点后的0通常读字母O的音。
百分数表达方式：%前是什么就读什么，读了之后加上百分号（%）percent就可以了。
Percent百分数
We write
We say
27%
6%
0.68%
twenty-seven percent
six percent
zero point six eight percent
Let’s practice some numbers
5/7
4/5
15.2%
0.06%
45.3
9.2
15.154
five seventh
fifteen point two percent
zero point o six percent
forty-five point three
nine point two
fifteen point one five four
four fifths
Look at the pictures. Do you know the names of the equipment
test tube tongs balance
crucible Bunsen burner
Reading &Vocabulary
potassium
（钾）
Let’s get to know some metals
sodium(钠)
calcium(钙)
magnesium(镁)
aluminum
（铝）
zinc（锌）
iron（铁）
copper （铜）
What is the correct order to describe the stages of a scientific experiment
aim
method
result
conclusion
Do you know how we can carry out an experiment successfully
Passage A
electrical adj. 用电的，与电有关的
electricity n. 电
equipment n. 设备，装备
react vi. （化学）反应
reaction n. 反应
oxide n. 氧化物
steam n. 蒸汽， 水气
Read the passage as quickly as you can and choose the best title for it .
The Different Uses of Metals
The Reaction of Metals
The Reaction of Metals with Oxygen
Passage A
Read the passage again and answer the following questions :
1. Which of the metals in the table reacts the most with oxygen and water
potassium, calcium and sodium
2. What happens when you heat calcium in oxygen
It begins to form an oxide.
3. Which metals react with steam
Magnesium, aluminium and zinc
4. Does iron have a slow or fast reaction with steam
It has a slow reaction.
5. Does copper react with water
No, it doesn’t .
Passage B
What’s happening to the nail in the pictures
Pre-reading:
Read the passage and complete the table.
cotton
wool
nails
Iron does
not rust.
water
Iron does
not rust.
water
water
Iron rusts.
1. In the first part of the experiment, the __ is dry ,not wet .
2. It shows that iron ___________ when the air is dry .
3. In the second part of the experiment, you must ___ the water to make sure there is no __ in it .
air
does not rust
boil
air
4. You add _______ to the water because this keeps __ out of it.
5. It shows that ___ does not rust in water that has no __ in it .
some oil
air
nail
air
Complete the passage with proper words according to passage A and B
It is hard to think of a world without metals. Different metals have different metals have different uses, for example, iron can be used in ________ equipment. But above all we should know whether it
electrical
will ____ under different conditions otherwise it will keep the equipment from working well. As we all know, if iron is heated in oxygen, it will react slowly but will not form an _____.
react
oxide
On the other hand , if it is put together with water or _____, there will a ______ reaction. Next let’s do an __________ to support the above . First , get a test tube filled with water and put it over the _____ to ______________ for three minutes .
steam
partial
experiment
bunsen burner
boil
Then put three or four clean nails in the water with some oil added to it and leave the tube for one week . What happens The iron does not ____ in air-free water. Another experiment , if you put the nails in the tube with the air in it for one week, then what happens Iron rusts in _______ water .
rust
ordinary
1.The earth is 49 times larger than the moon.
=The earth is 49 times as large as the moon.
=The earth is 49 times the size of the moon.
用times表示倍数，一般只限于表示3倍或3倍以上的数表示两倍可以用twice
Conclusion:
1. A + be+倍数+as +形容词原级+as +B
2. A + be + 倍数 + 形容词比较级 + than + B
3. A+be +倍数+the + (size, height, length, weight, width, depth,age） +of +B
翻译：
我们的操场是以前操场的三倍大。
这棵树是那棵树的五倍高。
Grammar
Example:
A: The Yangtze River is about three times as long as the Songhua River.
B: The Yangtze River is about three times longer than the Songhua River.
C: The Yangtze River is about three times the length of the Songhua River.
Winter in Harbin
Winter in Beijing
-20℃
-5℃
（cold/coldness）
A:Winter in Harbin is four times as cold as in Beijing.
B:Winter in Harbin is four times colder than in Beijing.
C: Winter in Harbin is four times the coldness of winter in Beijing.
Mount Tai
Mount Qumolangma
1521m
8848m
(high/height)
A:Mount Qumolangma is about six times as high as Mount Tai.
B:Mount Qumolangma is about six times higher than Mount Tai.
C:Mount Qumolangma is about six times the height of Mount Tai.
1.What subjects are you interested in
2. Are you always interested in it/them
3. Why are you interested in it/them
4. What do you think of science
Discussion
Cultural Corner
Why has Mark become more interested in science
辨析
used to do sth
表示过去常常做某事(但现在不做了)
be used to (doing) sth
习惯于(to为介词)
be used to do sth
被用来做某事(被动语态)
Language points
The science facilities are very good, with laboratories that have all the latest equipment.
这些科研设备非常好，实验室配有最新的设备。
with在此句中意为“带有……”, 其引导的短语对句子作附加说明。
that have all the latest equipment 为定语从句, 修饰laboratories.
The fact is, Canada has many first-class scientists.
事实是加拿大有许多一流的科学家。
first-class为形容词, 意为“第一流; 最好的; 最优秀的”。
如：
They can afford to eat at first-class restaurants.
She got first-class results in her exams.
The Nobel Prize is the highest prize there is, so we should be very proud of that.
诺贝尔奖是目前科学方面的最高奖, 因此我们感到骄傲。
there is为定语从句, 在句中修饰prize