1965-01-29 — Page 23

日九廿月一年五六九一瘿公年四十五凼民齢

For

21C

ferrous

sulphide

acid

hydrochlorio terrous

blorida

PeC1,

11,57

hyd Fogen

sulphide

*

pbs|

•

2CH2COOH

真三第張六界

日七廿月二十年辰甲歷要

WAH KIU YAT PO

Η

#

五期

#

華僑教育

一九六五年度

試題預習專欄

化學科

(八)

→

王錦釗。

「升中指南」英文科教材

CHEMISTRY

今日在麗的呼聲播出

Solution to last week:)

yuestion 1

時間:

上午十時四十五分至十一時 下午六時十五分至卅分

(8) la the manufacture of sodium, carbonate by the Solvay Prossis.

the basic raw materials sodium chloride and limestone (calcium carbonate) are converted by Indirect mespa into sodium car. bonate and calcium chloride,

Tge process depende uapos the faci that sodium bicarbonate is not very soluble in brine and also upon the way in which use is made of the by-products during the process

Basic Raw Materiais.

CuCla

(CH3COO)#b

Lead acetate

tead sulphide colourless solution) (black ppr)

acetze seid

(b) in a second test-tabe, the black solid will dissolve slowly

an shaking and a blue solution will be obtained. When am monia solution is added drap by drop to the solution, a light blue precipitate is firat obtained, which dissolves in excess ammonia feraing a deepblue solution. This indicates that the blue solution containa

basic a copper sult Cupric oxide, a oxide, neutralised the hydrochloric acid to give a salt, cupric chloride, and water We have also identified enprae oxide.

Cul

tupric oxide

2UCI

2NKOF

CuCl

cupric chloride (blue solution)

2NBC1

Cu (OF) 2

26

"CONJUNCTIONS

▲ conjunction is a word that joins words or sentences together.

*.8. George is • diligent and polite boy.

-

She eats her breakfast before she goes to school,

USES OP SOME COMMON CONJUNCTIONS

AND

BUT

Mary and Ann were absent yesterday,

She plays hard and she works hard too..

He was poor but honest,

He is not tall but he is strong..

BECAUSE

IF

He is ill because he has enteb too much.

Everybody likes john because he is very polite..

We will not go if it rains.

tou will pass the examination if you work hard.

UNTIL

Te shall wait here until he returns.

You cannot go home until you have finished your work,.

WHETHER (WHETHER.......OR)

don't know whether you are right or wrong-

He asked me whether my father was at home.

UNLESS

VINCE

EX

BAN

We cannot see in the dark unless there is some light. You cannot pass the examination unless you work hard.

a) from the time when'

I have known bim since he wAS a little boy.

bjbecause

Since you are ill, you cannot 20 to school.

He is taller than 1.

I am older than she

with one of these words?

THEN-

he was writing a letter when i came in.

They stood up when the teacher came in.

RILE

He was reading while i was playing the piano. won't talk while the teacher is speaking,

EXERCISES

Join each of the following pairs of sente

IP, THEN AND BECAUSE, BUT

see,us, ne is blind..

hand. You know the answe

s.1, nod my hard.1 meet my teacher.

4.He knows English,në, knows French

e.He is nogrullo is happy."

il) in the blanks "With the correct conjunctions

I don't know

he came from.

Jean" or Mary knows the answer.

you help me, she feels very sad.

a‚He cannot.

b. Put up

a

Jeannot do this exercise

2. She does not cry

e.I havent seen him

| 1965年度

| 中学入学試

he left nang Kong.

Sadium Chloride

Brine

NaCl

NH

CO12

Limestone

NH2

replace Голе

Brine Absorbs Ammonia Ammoniacal Brine

Salvay_or_

0 Carbonating CO, reacts with ammoniacal bride

Tower (1)N, O+CO2+R10»NH ̧ ECO +8

(i) MACHINE ÍCH, NH CI NHÉO |

Solution

#et Solution

Cope Roaster

50114 NalCo

Na Co.

2NalCO

Eco

Pure Soda Ash

Na CO

Harod

Products Obtained

Kiln

CACO,

Cao

Ammonia N# C1+C&O converter 2N.

-Caffe

Product

The

Brine is first saturated with anmonía and is then allowed to trickle down the Solvay Tower up, which carbon dioxide under paessure is passed. Here a mixture of sodium bicarbonate (precipitate) and ammonium chloride (solution) is formed precipitated sodium bicarbonate is removed by filtration and washed. When it is heated strongly, it decomposes to give very pure soda ash (anhydrous sodium carbonate) Use of by-producta:-

[1] Carbon dioxide for the Solvay Tover comes from -

i), the linėkiin where the limestone is decomposed lata

quicktime and urbon dioxide;

11) she roaster where the sodium bicarbonete is deco□-

posed, futo" soda ash sad carbon dioxide

(11) Amnogie for the engoniëting tower is outarned

by

heaving the quickfine from the kiln and monum chloride from the filter. However, a freab supply of antonia has to be added from time to time ag à little ammonia is lost from the plant.

(1) A few Spoons of the given sample of sodium carbonat

put: Lato a clear, dry evaporating, dish,

(i) The dish and ita contenta are then heated over a water

مجھ

bath for a few minutes to drive off any moisture that

my be present, ufter which 14 is cooled in a desiccator. (i) The dish and its contents are then weighed.

(iv) The carbonate is again heated, this time over

bunseo

flame for at least 15 minutes The carbohate is re- moved to a desiccator to cool, and the whole, se again weighed, when cool

If the two weighings obtained are identical, the given sample of sodium carbonate is pure Bu should there be a loss of weight after heating, we can say that the sample of aðdrum „carbonate la: contaminaten with some bicarbonate:

gestion 2

2NaHCO

(168)

A small quantity of each subtance is put separately into rive tent- Lubes, and sour moderately concentrated hydrochlo to agida added to each ta) Effervescence will occur in one of the test-tubes, and a gas

which has a smell of bad eggs given off. A piece of filter paper dipped in lead acetate solution becomes abiny black when held in the gas This indicates that the gas given off as hy - drogen sulphide and that the said in the test-tube is sulphide We have thus identified ferrous sulphide

ONGKO

設甲所有爲上,丙息的一

生

124

Cu(OH)

A

ammonium hydroxide 4NH2OH

A

emmoni un

copric hydroxide

chloride (light blue ppr)

410

(Ca 4NH)(OH)3

cuprammonium hydroxide

(deep blue solution)

(e) In a third test-tube, the black solid will dissolve slowly on sbaking to give a yellow-coloured solution The original aubstance in the test-tube ia magnetic iron acide which behaves as though it were a mixture of ferrous and ferric oxides Wher it dissolves in hydrorbloric acid, it produces in solution a mixture of ferrous and ferric chlorides

+ Buch

magnetic roo

oxide

-

PeCl

ferrous chloride

Робез

ferric

chlorid

40

A few drops of concentrated nitric acid oxidises the ferrous salt to the ferric malt which gives a reddish brown proci pi tate of feeic hydroxide on the addition of caustic suda solution

FeCl

+ JNaOH

Fe(OH);} 3 NACI

caustic soda forric (solution) hydroxide

The remaining two substances do not react with dilute hydro- chloric acid in the cold, Some concentrated hydrochlorie acid is added to ench of the two test-tube; which are then heat gently.

(a) In one of the west-tubes effervescence will occur and a greep

gas will be evolved which will turn starch paper dipped in potassium iodide solution blue The gas evolved is chlorine Manganese dioxide, which 19 an oxidising agent. has oxidis ed the hydrochloric acid to chlorine

MnO 2

40C)

M

manganese

dioxide

mnCl2 CLT

manganses

chlorine

20

chlorine

Cl2

2K1

potassium-

Iodide

2KC1

potassium chloride

Iodine

(e) No reaction takes place in the other test-tube,

We can show

this substance to be charcoal by passing oxygen or air over the solid while it is heated in a combustion tube. 'It will glow brightly as it is oxidised by the oxygen and an invisible gas. which will tura Fime-water milky, is evolved. The gas given or ie carbon dioxide

02

с

charcoal

CO

DONA KO

Co (01) 2 fine water

questions for next week,

carbon

dioxide

CaCO3}

chalk. (insoluble {

Illustrate each of the anin properties by means of a renction and describe how you could demonstrate these reactions in the

laboratory

oxygen 22.295..

Dydrated sale had the following percentage composition: zibe 22 65%.alphur 13 15%, water uf" crystallisation 3 9%

formula of the #sit? What to the

(b) You are given a solution of copper sulphate

Describe how you would obtaio from solut fuð

(i) pure dry copper sulphide;

(1) dilute sulphur acid.

算術科

(八)

會惠方

·故三人共有490元

47

H 分數四則應用題

A由全體求部份

420元*

3

705 50

精式:420元×(1+

}

70570

12

B 由部分求全體

̇由全體部份,是已知全部或原有數量,根據選數決求用它的裁分之多少,或求所解的方

特別多,雖然命盤的內容變化不定,但機不出下面三個原則

1. 提供系馋的實飲,及代表部份的分數,求還代表部份的定做。

2.湯供全體的變數,及一個工代表部份的分数,求其所餘另一部份的號數。

5

3.提供原有數量,及另一個代表部份的分數,求原數與另一部份加之和。

2

(一)布一幅長2——碍,用它的......來做衣服,問用去?(1960)

2. 選是右的全孩,——一是做服的代表分數 •

8

̇部份一樓×分數

解

8

5

2

5

因:

5

2- -

5

2

例二)甲有銀 600元,他把~

•B2:

-BPS.

●丁間眼還剩多少?(1958)

10

20

解,設全毗篇1

1

̇則乙丙丁共佔全數

of

10

20

·10

剩餘部份佔全數的1

10

10

故甲邊剩號:600x

**60

-10

#: 600 5×[I~(~~~~+

·36070

10

20

:

2

(创三)某瘤有疑20元,先用去

,再用去所餘 一,開除歡多少?(1958)

* REKE 1

1

先用去,微飯 1-

:4

3

2

ປ.

再用去所餘 (一)的

·即用去全數的

4.

5

4

5

10

***** 1-(

4

10

20

蚊除新景:20元×

9

20

1

2

#: 2072× (-1 -

-) x (1

(四)甲有440元,乙是甲的一

7

12

從部份求全體,是根據已知部份的實數,與其所佔全部的分數,或外部

全部或沒有數量。此類算法,保用分數去除已部份的質數,其所提條件及所求目的,不外上立 個原則:

1.提供部份的實數,及其代表分數,非全部或原有數量。

2.提供部份的實數,及另一部份的分數,求其全部威區有數量、

3.提供部份的霸數及共代表分數,我求全部或原有數量,然後求出另一部份的數

(例一)某數的四分之一是8,宋某數 (1961)

·解 8是茶燻一部份的變數,...... 8的代表分數

4

依濶意涙锬部份實數(8)求其全體。

服公式:全體部份小分數,

RE: 88

3

4

x

32

(例二)店套客人——一是婚女,其餘的是男子,如有婚女21人,有男于多少人?(1961)

節,店裏男女客人共有:21~

BT(ARIO:1-

RETAIL 2- 28A, X-

2

則男生應佔全粄人數的:1

5

3

I

·戴眼鏡的男生佔全殺人數的

5

3

ર

不就跟鏡的男生應佔全部人數的

5

2

故全級男女生共有:18人<

15 A

5

2

M£:18A+[(1 — —

5

3

#

2

(1) 某校共有學生850人,女生,求男生人数。

5

2

(2) 路763運,某人乘行全程的-

問業人步行接康?.

,乘船走全裸的 3

5

#

(3) 甲有限4500元,乙甲的......,丙乙的,求西有元?

9

5

:5

(4) 米一捅共272斤,吃琺

·,還餘米花斤?

17

(5) 某大厦共分十一府,高跟券270只,討一至四樓佔滿的

3

的,求九亞環樓佔高多少?

10

9

(6) 某人步行全程的一 -恩36期,開全程思多少跟?

16

5

8

(7)布一疋,剪去謝餘151 求过布疋原長碣?

3

KENNEL

BA121A 4 ---x (1-

3

4

(例三)甲乙两三人分錄,甲得——160元,乙得——交180元,再得660元,問丸

###F? (1958) 景設全數為1

1

其中:160元十180元+660元 1000元;此數當爲三人所分的一部份實戰。

面溫1000元實佔全部的:1-(t+

5

3

4

12

REZĦEAMISAMEKNA : 100052+--

240030

## (3605-1-18053-1-66058 ) + (1 -

1- 24000

(B)甲年56歲,乙甲的一一,因是乙的一,甲乙丙三人共幣變。

2

3

《夕》一举挿入池中——在呢,一在水,露出水面有8尺,涼地長。

9

13

5

(10) 某数的比它的——一小24,求某數?

3

8

3

24

1 (11) 六年級學生有一只男生,女生寄宿,若不寄宿的女生有12人,問男人*

4

5

2

5

5

9

(12)布一疋,剪去發表衫用去15尺,恰是其餘的一一,追疋布原是快尺·

附疎望七答案

(佛四)五年級學生有一篇女生,有一 -的男生戴眼鏡,若不戴眼鏡的男生有18人出男女

#BAT (1964)

暢便金服男女生人數篇 T

3

(1)

(3) 4

(4)

1

(5)

(6)

(7)1-

9

25

43

(8) 2

(9)

(10) 11

¿(12.).

$1

1

-| -| -| -

5

4

43

44

3

《本柵送期一、三、五判出,