Module 5

A lesson in a lab

Module 5A lesson in a

lab

Module 5A lesson in a

lab

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 .

Read the passage carefully and fill the

chart on page 45.

Read the passage again and complete

the sentences.

Passage B

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

fillde 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

Read about an incident during a

chemistry lesson and choose the best

summary.

Reading on P93

1. A student didn’t follow the instructions carefully . He took the wrong liquid from the cupboard and nearly poisoned the class .

2.The chemistry teacher was demonstrating an experiment when she heated a poisonous liquid . There was so much smoke that the students had to leave the room .

3. A student was doing a chemistry

experiment when he accidentally

heated the wrong liquid and caused

an incident in the laboratory .

Read the passage again and answer

the questions :

1. What substances were they using ?

Baking soda and hydrochloric acid

2. What substances were the students

making ?

Salt

3. How can they make the reaction

quicker ?

By making the mixture hotter.

4. What mistakes did Paul make?

He used the wrong liquid .

1. Why did he make the mistake ?

Because there was no label on the

bottle .

2. What happened when Paul heated

the liquid ?

It formed a thick cloud of white gas.

3. Why did the teacher send the students

out of the room?

Because the liquid was acrylamide

and the gas was poisonous .

4. What lesson did the incident teach the

students and the teacher?

Never to leave a bottle without a label

in the chemistry lad .

1. Learn the new words by heart.

2. Read the passage A and B and try

to retell it .

Assignments for you

(language points)

(language points)

镜头再现

1. The earth is forty-nine times larger

than the moon .

2. The more books I read, the more

information I learn.

上面两个句子中重点强调的是比较级。这一语法现象我们在初中已学过 , 现在我们对这一语法进行总结。

三种比较句型的转换：1) A+be+four times + 比较级＋ than +B

2) A+be+four times+as+adj/adv+as +B

3) A+be+four times +the +N of B

The well is four times deeper than that one.

= The well is four times as deep as that one.

=The well is four times the depth of that

one.

哪一些词可以来修饰比较级？1) much/rather/a bit/a little/a lot/a

great deal/any/…

2) 倍数、分数、百分数、小数3) 一些名词

The weather in winter in Beijing is

much colder than that in Shanghai.

This book is 50% percent more

expensive than that one.

John is a head taller than I.

一个固定句型 : the + 比较级 , the + 比较级The more often you stay with him, the

better you will find he is.

The faster we walk, the more likely

we will be to catch the bus.

The more, the better.

The sooner, the better.

1. That doesn’t sound very frightening,

Paul. I’ve seen _______. What did you

like most about the film ?

A. better B. worse

C. best

D. worst

Choose the best

2. The number of people present at the

concert was _______than expected.

There were many tickets left.

A. much smaller B. much more

C. much larger D. many more

3. He speaks English well indeed, but, of

course , not_____a native speaker.

A. as fluent as B. more fluent than

C. so fluently as D.

much fluently than

4. It is reported that the United States

uses ___energy as the whole of Europe.

A. as twice B. twice much

C. twice much as D. twice as much

5. Mary kept weighing herself to see

how much _____she was getting.

A. heavier B. heavy

C. the heavier

D. the heavier

6. The house rent is expensive . I’ve

got about half the space I had at

home and I’m paying _____here.

A. as three times much

B. as much three times

C. much as three times

D. three times as much

7. Our neighbour has__________ ours.

A. as a big house as

B. as big a house as

C. the same big house as

D. a house the same big as

8. As far as I am concerned, education

is about learning and the more you

learn, _________.

A. the more for life are you equipped

B. the more equipped for life you are

C. the more life you are equipped

for D. you are equipped the more life

镜头再现

The reaction of metals with these

substances can be put in order .

In order /in …order /in the order of /out

of order

1. 在图书馆，图书通常是按作者姓氏的第一个字母顺序排列的。

In the library, books are usually put in the order of the first letter of the writers’ surname .

2. 他桌子上的书摆放整齐有序。 The books on his desk are in order

(orderly).

将下列句子翻译成英语

3. 请按照正确的顺序将下列单词排列。 Please put the following words in the

correct order .

4. 我们这次是按照年龄顺序而不是按照身高站队。

This time we stood in line in the order

of age instead of in the order of

height .

镜头再现

Half-fill a test tube with water .

fill …with = be full of

将下列句子翻译成英语1. 请将这个瓶子装满水。 Please fill the bottle with water .

2. 听到母亲的话 , 他顿时充满了自信。 Hearing mother’s words , he was filled

with confidence immediately.

3. 他满脑子都是知识 , 但他不是一个书呆子。

His brain is filled with knowledge but

he is not a bookworm .

4. 看到这个恐怖电影 , 这个女孩心中充满了恐惧。

Seeing such a frightening film, the girl

was filled with horror.

镜头再现

Add some oil to the water .

add…to…/add to …/add…up/add up to

1. 毫无疑问这是火上浇油。 There is no doubt that it is like adding oil

to the fire .

2. 这些新建的公园增添了这个城市的美丽。

These newly-built gardens add to the

beauty of the city .

3. 1 到 100 加起来总计是 5050 。 1,2,3….and 100 adds up to 5050.

4. 把这些数字加起来然后告诉我结果。 Add all these numbers up and tell me

the result .

5. 8_________5 is 13.

A. add to B. added up to

C. added up D. added to

镜头再现

This will keep air out of the water.

keep …out of /keep …out /keep…from …/

keep off /keep up with

1.Before you go to bed you’d better close the

doors and windows to ____ thieves ___.

2.The fire is dangerous so you should ____

the child __ the fire.

3.Please _______ the grass.

keep out

keep

off

keep off

1. I had to walk faster than before so that I

could ___________ him.

2. In winter we usually put on more clothes

in order to ____ the cold ___.

3. I wonder what ____ him ____ attending

the meeting yesterday.

keep up with

keep out

kept from

4. You’d better ____ yourself _____

their quarrel. It is none of your

business.

5. Close the door please so that we can

____ the heat _____ the room .

keep out of

keep out of

Finish the exercises on grammar on

page 43 and page 47.

Assignments for you