1972-12-07 — Page 21

育教僑華 頁一第張六第日二初月一十年子壬夏 WAH KIU YAT PO

報日僑華

四期星

The tunnel is built by then. E. The tunnel was built by them.

育数僑華

1973 中學入學試

試題預習專欄

1973英文中學會考試題預習專欄

智慧出版社主编

, the news.

英文科 (七)

The news was heard by us, news are heard by us.

化學科

0. The news were heard by us. D. The news, heard by us.

Chemistry (7).

ANSWERS TO PREVIOUS. EXERCISES.

K. The news. ds heard by us.

Solution for last week

A B C D E

SECTION AS

2. B

3, C

6. P

7. S

2.B 3.A 4.

9.

10. P

SECTION 3:31. You may not take a rest

now

They ought not to go home.

You should not help

often.

Won't she come here.

again?

5. Don't Let the ohildren:

play here.

6. I have not anything to

7. The wind did not. atop.

blowing...

8. Don't cross the road along

this path.

dur team has not yet won.

40. Taid not lose my keys. any

where..

SECTION

(multiple choice)

Choose the best answer. Draw a firm

line across the correct box.

EX:

He takes an apply. A. An apple was taken by him. B. An apple has taken by hims C. An apple is taken by him.

An apple were taken by him. An apple are taken by him.

The bird sings a song.

BCDE

□□中口口

A. A song was sung by the bird. B. A song were sung by the bind. A song is singing by the bird, D. A song is sung by the bird. B. A song has sung by the bird.

B C D E

□□□□□

wind blew up some huts. Some huts are blown up by the Pomehuta were blowi

C. Some huts blown uy by the

If Joma huts was blown up

wind.

Some huts is blown up by the wind

□□□□□

police will catch him.

.□□□□□

John is washing the dog.

P. The dog is washing by John. g. The dog is being washed by John.

The dog was being washed by John. The dog were being washed by John. **he dog has been washed by Jóha

P Q R S T

□□□□□

She kept a lot or chickens.

P. A lot of chickens was kept by her. Q. A lot of chickend is kept by her. R. A lot of chickene were kept by her.

had been kept

3. A lot of chickens:

by hers

A lot of chickens were being kept

by ber.

Put up your hands.

□□□□□

Your hands are putting up by you.. Q. Your hands will be put up by you. R. You are requested to put up your

hands.

S. Tou are told to put up your hands. f. You are told to put up our hands.

□□□□□

Where did you find it?

P. Where it found you?

Where were you found?: Where is it found by you?

here was it found by you? Where had it been found by

P Q R S T

□□□□□

who is banging the door?

P. By whom is the door banged? Q. By whom is the door being banged: R. By whom was the door banged?

By whom was the door being banged. By whom banging the door?

10.

SECTION

FOR SURES

□□□□□

Yut the verb into the Passive Voice

in each sentence.

Ex: Speak English is spoken in

Hong Kong.

READ

newspaper: 18 Tather.

by

USE.

A lot of water.

every day.

A. He was caught by the police.

FIND

Where was the car

B. He would be caught by the polic

C. He will catch the police.

KIL.

Hundreds of pigs

D. He is caught by the police.

·SEND

The parcel was

Jack,

He will be caught by the police.

TEACH

Chinese is

in most

A B C D E

countries.

7. WASH.

yet?

8. KNOCK

have built the tunnel. The tunnel has bullt by them.

turmel has been built by them.

An old man was

yesterday?

down

19. WEAR.

My shoes are

10. DRIVE The bus was:

Hr. Luk

3.□□□□□

The

tunnel had been built by the

Has the floor been

Nuclear Chemistry

(七)

日七月二十年二七九一届公年一十六國民華中

Nuclear chemistry 19 the study of the properties, composition, and reactions :of the nuclei off atoms.

(1) Natural. Spontaneous hadioact- ivity

7. In the atoms of naturally radioactive elements, spontaneous changes: take place that are tatal: ly distinct from the sort of chemical changes that we have seen considering. Studies of these elements show that they emit thre kinds of rays:

Emission Nature Relative Relative

mass ' charge

He Nuclei

54-

elect- rons

1840

elect

magnet -ic radiat

ion

10

+2

a

There are two different but im- oortant kinds of nuclear trans- Pormation:

i) By ejecting an alpha particle

from the neuleus,

U238 92

234

ii) By ejecting a beta particle

from the neuleus.

234

234 Pa

(2) Artificial Radioactivity

The nucleus of an atom can be artificially bombarded by very fast-moving, exceedingly small, ligh. energy particles, some of Che bombarding particles strike She nuclei that lie in the line of fire and combine with them to form new nuclei.

(3)The difference between normal chemical.changes and nuclear

changes

A chemical change is an in- veraction between the electrons: of atoms of different elements. but involves no change of their nuclei. The energy Liberated 之日 comparatively small.

A nuclear change: concerne only a change or transformation

the nuclei of atoms usually

With the liberation of tremendous amount of energy.

(4) Nuclear fission

Nuclear fission is the irocess in which one atom produces

wo or more simpler atoms and nergy.

920335

ΔΕ

36Kr.

Mass: 235.0439

120087

236.0526

235.8454

143.88189.947 2.0174

Therefore its mass change is

0.2072

Einstein proved his well-known

equation E = Me-

Energy liberated ∵( in engs)

Mass lost x

(ing.)

or energy

1.e.

Volecity of light)? mass lost x 1020

1020M

in cm. per sec.

in calories) 020

10

(2.4 x 1012)M.

(5) Nuclear fusion .

Nuclear fusion is the process in, which two or more atoms com- pine to form: one atom.

4 H

4.0324

He

4.0039

+ 62x1011cals.

0.0285 mass is, lost and an equivalent amount of energy is liberated.S

(6) Making new elements

When an element is bombard ed by neutrons, a nucleus may absorb one or more of them. If one of the neutrons so absorbed changes to a proton and an electron, a

element is formed.

new:

Uranium + Neutron

plutonium + Electron

93.

"protons 92

Neutrons 146

Exercise

1. A radioactive isotope of carbor

go14 changes into an atom of

nitrogen emitted?

Aoy rays

0. g rays

14

E.cosmic rays.

which rays is

3.8 rays

rays

2. Which rays is identical. with helium atom?

A. cosmic rays

E.

rays rays

3. Element

B. x rays

D. B rays

emits an i rays.

to form element X and then a g rays to form element Y. The mass number of element Yis

A. 237

0.235.

E. 233

4. d) rays

B.236

D. 234

A. are helium nuclei,

He1

B. have a high velocity fast than

light

C. emits to uranium to Torm

thorium

D. emits to polonium to form

Tead.

E. emits to Radon to torm

palonium

5. Which change belong to nuclear fusion®

A.

5810

90Th

234

2He

2Het

920234.

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感測

至明年暑假一千五百名僑胞暢遊服務

又,而外旅遊歷:即將下述嵬胡飛十二架,自製麻新年

踲 十周 九四大 城關下,往費龙徽合時

鲜