1977-05-02 — Page 20

冀四第張五第

日五十月三年

WAH KIU YAT PO

報日僑華

●期星

1二月五年七七九一曆公年六十六國民華中 有教像醫

中學會考科目委員會 今秋有委員出缺

游一切事宜。 -開賣實研究各科

一區所成,黃實助理會。 茧於各科目委員會。

·内特快樂中學·安之表格寄交本人。根 參加學校得提名填補

·宜,並就其所究院

丸,其成員包括現任之

藏式

向圣校,今

**

發出之議選稱:一九七一张良供本會之執行員 |各參加香港學校校長所真書工作,進關提名華

德

社

社德崇港香

千五會浸捐

(K) HUIS

收梨

者委員會乃

·,中學會一季童之客高慎式。

Ray

3. 目各交空港

及工時監及各品加會考校之會活動之用外,亦供多 一之規定說捕。各科插教育可之代表,香港會長林貝車嘉女士主持 RKEJUR+4K+ FURNAS-SKO ] - @EIPHOPPE NRERES KE-PEIKKE- NEUBESHENI 千丞真空缺,此呼空缺 教育可接辦香港中榮任費港幣五千 香粥理工学院,敎育學術社會 黹,除供該

術

·鹽經知科——三名 由曹丕員會十二名委

季科——三名,中國在

--

蒙民偉中學

職用

最外蜜

協力服務社會益人革 紅十字會青年團成立

務會

科——三名,英國語文

--KBI- 二名,經濟及公樂事務

文科———三名,商業科 史科——→四名“中國 WAVIN - BHA WINK • 代语文科——四名,音會九龍陈集七十五團 位團,將來均有擴會 -數學科——...二名,現一女,正式成爲紅十一十分濃厚。新加入的每 二名-康史科——二茗括十二名男像員興十名的心情下,學習的興趣 科——三名,地理科——立,十二位美女像典包學發消後,每人在求知 料—...二名-英國文學學紅十字會青年團作成他:青年是一個 (K) +QEK · ACHTHYERES)

理。

名科管現茗

——科助理抽空羅慶薜一各項課程,吸取更多得

二名,工業科─二

現特

EASTERCINK THISHAK - KE 表格上摄名貴校教師與多了一批生力軍加入江 下於函附之置是精致訓詞時表示,與博瓦。 闆及冢利事務部助理監已在知上,能更-

實 香港紅十字會青年領袖才能的訓練, | KZHUKREA

· BYKKERER

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ADE - KETBE E* - 6538 - 24

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生新招部交英中

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定主!

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力 - 萨得學生家長之信

親。該校秀席合放置交

人士參加。 DOC-R ERECHOTIKK E-EXPRENEM 學生青年運動,如材挺,有迆一步的學習機會

賽,主副是一初中會考(內二十)興運動 五年級新生,贏校探 一条文及泰银股計比——現正招收中英文一年 ,此外,故運動亦年間,體於每日下午三,進而投考大學。該校

書時(何文田常無法交界限三四文部中大(F-6)

來新衣岩或親自道一長,由下學期起滑辦英

』,若望有美語人士書蔽,

1977中學會考試題預習專欄

明德社主編

化學(廿五)

朱宏林•

Chemistry (25)

· Question 42

A. The experiment below is to de- termine the molecular formula

of a gas X which is a compound of two elements.

gas X

gas syringe

A

m3

glass wobl

tube B

heat

Pas copper syringe O

100 cm of gas I were passed slowly over the heated copper In the tube B. At the end of the experiment, the following results were obtained. (A11 volumes were measured at room teperature and pressure).

ass of tube B before

the experiment = 25.000 B Hass of tube B after

the esperiment 25.067 £ 50 cm of nitrogen gas were

collected i Cas syringe C Some of the copper powder hed turned black. het is the black substance? What are the two elements in

the gas X?

Why did the tube B gain in mass?

het is the mass of nitrogen collected in gas syringe : C? (lolar volume at room terr erature and pressure is. 24 dm

het is the mass of the 100.

offene i mas syringe A? f) het is the mase of 1 mole

of gas X?.

g) Calculate the empirical for-

myla of gas X?

Tence, using your answers to (f) and (s), determine the molecular formula of cas X? 1) Give the equation for the

reaction which took place in the tube B..

1) What would you observe on mix-

ing ges X with oxygen?

Give

en equation for the reaction between as I and oxyren..

B. Describe wht happens and exp-- lain briefly, giving equations, in each of the following szp-

Das is passed in-

to a hot concentrited solut ion of pot ssium hydroxide inter.

(ii) for drops of potessi

perancenate solution is add- e into a moderately concer- trated solution of hydrogen peroxide. uestion 43

A. When hydrogen peroxide is added onto some mange rese(IV) oxide, it will decorone to give water and oxygen. In a particular experi- unt, 50 cm of a sample of sal- ution of hydrogen peroxide in added onto 2 g of hanganese(IV) oxide inside a motion, flask and the oxygen evolved is collected in a gas-syringe connected to the flask. ve volume of oxygen cao evolved is recorded at an interval of one minute. The volumes, measured at room tempe- rature and pressure are then pl- otted against tine and the graph thus obtained is shown below.

150

ay Write the countion for the

ecomosition of hydrogen peroxide? apak

What is the maximum volume of oxycen obtained at room temperature and pressure?

How many minutes have elapsed when the reaction is complete? A) How many moles of oxygen are

formed when the reaction is. compolete? (olar volume t room temperature and pressure is 24. dm

What is the concentration of the original hydrogen peroxide solution in (i) mol-dm? and (11) g dm?

What fraction of the hydrogen peroxide has decomposed after 4.0 minutes?

6) When is the decomposition at

the greatest speed?.

B. The production of ammonia by

the aber Process involves the following reversible reaction:- N(c)+3, 2, (c),

All -- 186 kJ-equation a) Is the reaction exothermic

or endothermic?

b) What is the heat chenge(or

enthalpy in preparing 51 € of ammonia?

What effect will each of the following change have on the yield of ammonia

ncreasing the total. pressure;

ii) raising the temperature; iii) inçre sing the pressure

of nitrogen only? In what way will a suitable catalyst influence the equil- ibrium of the above reversi- ble reaction?

Mare the catalyst usually en- ployed in the Process?

al volume of ammonia would be obtained if 150 cm? of hydrogen as have completely honated?

Qucation 14

M. 4.12 m of a solid eiztmie cock sisting of sodium bezmocile and anhydrous sodium er chonate is dissolved in water and the dol÷

tion is then dep to 250

25 om of this solution required 18 cm of 0.51 hydro-. c'storie noid for completa nent- rolization.

ca.

imite

down the equations for the genotions concerned. Calerate the porcentaje composition of the ordinal eid mixture.

3. Information about some ovides-

of the clennants in the secord period is superized in the fo- 1lowing table:-

10, ar vainner atra

atcom, in 1

Julestik cəbinə!

with c

=

2

3

24

=

-1

2

3

ร

6

7

10025

.. afte

setcion de Hivity at ORLÓN ÁT

igula stata

Med

חז-

ابه

ኣ

tyring yo

a Which of the oxides are ran- eous, at room temperature?

h) Which of them is most likely

to be liquid at room temper- ature?

a) Which of them will sublime

on heating?

d) Which of them is/are likely

to composed of ions? Explain briefly why you have chosen it/them

e) Two of the covalent oxides

in this table have giant mol- ecular structures, which are these two oxides? Ixplain briofly your reason for mak- ing this choice.

f) diagrams to show what harpens to the atoms in foring

(1) the lithium oxide; (ii the fluorine oxide.. estion 45

A. 3 cm

of a 0.2 solution of metallic stricte va placed of ter test-tubes of in erol

1 bore. Various lines of 4.1 -tion of hari o'lide

(and

rach of

water were added to the test-tubes so that the total volume of lichid, inlel the tent tubes were the sure, After pet- tling, the height of the precip- itate in each tube was measured and plotted against the volume of the barium chloride solution adred.

relativ

•Faight of Treipitate

Give the ionic equation. for the formation of the proei- ritate.

b) How many moles of the metal- lic sulphate in the 3 cm of 0.2 solution?

What volume of 0.1 barium. chloride solution is required to precipitate all the silp hate ions?

How many moles of sulphte ions are there in 3 cm of the 0.2 solution of the metallic slphate? Verce, how many moles of sulphate ions in one mole of the set- allic sulphate? What is the possible ionic charge on the metallicion if it is found that there are 1 mole of retallic ions in 1 mole of metallic silp- hate?

f) What is the possible for la of the metallic sulphate? 6) If the formula mass of the

metallic sulphate is 119, what is the relative atoric mass of the metal?

B. In the following experiment

pure dry hydroen chloride cas is passed over heated iron and à solid S is obtained end te other product(s) is/are then passed over hete copper(I) oxide.

altroEM of day

HO

rilinga

wool

copronomia

a) Identify S and E. b) Cive the equation for the reaction in which solid S is formed.

Why is solid S collected at the place shown, but not on the iron filings?

d) Write the equation for the

reaction that takes place in the boat P.

e) What is the mass of solid S that could be obtained when

56 cm of dry hydrogen chlo-

tide, measured at s.t.p.. have reacted co:pletely? -

經濟與公共事務

̇孔繁盛·

(廿四)

Rconomic and Public Affairs

(24)

Trade and Industrial Devel- onment in Hong Kong

A. The Government's Role

To facilitate the trade and industrial dev- elopment, the Hong Kong Government provides assis- tance in respect of the following services:

1. Institutional services: The government has helped to provide institutional assistance for industry through the Hong Kong Trade Develo"ment Council, the Tong Kong Export Credit Insurance Corporation, and the Hong Kon~ Productivity Centre. They are financed from public funds and pro- vide sales promotion ser- vides, a credit insurance scheme, and various types of training and consultan- cy services respectively.

The government

also

gives,

financial and other supp- ort to such organizations as the Tederation of Hong Kong Industries, the. Hong Kong Management Associat- ion, the Hong Kong Industr- ial Design Council and the Hong Kong Packaging Council

2. Industrial Training: Two universities in Hong Kong provide technological training in engineering, architecture, and electron- ic science, while the Tong. Kong Polytechnic provides higher technical and voce- tional education. The

overnement also runs three technical colleges which

provide technical trairing at craftsmen and technician level. The rovernment also encoureres and assists com- ponies to start annrentice- shin training schemes.

3. Industrial Fard Policy: The government's sale of

and is sometimes on speci- al terms to accommodate Industriesheil are land and capital intensive, or

An Indus- high technology" trial Estates Provisional Authority has been set up to Rexelon and manare the industrial estates planned for Tai Po and Yuen Long.

B. Other Services/

1. Banking: Panks in Hong Kong specialise in the financing of international trade. The maintain ex- tensive credit information and commercial introduction services for their clients and those wishing to esta- blish business with Hong Kong. There are 74 licensed banka in Hong Kong, and many of them have branches and correspondents all over the world. Thus, Hong Kong. can offer a comprehensive banking service in an in- ternational scale. Resides the absence of foreign ex- chenge control allows a speedy handling of transac- tions.

2. Insurance: There are many insurance companies. represented in ons Kone. All classes of insurance are readily available.

3. Chambers of Commerce: The Hong Kong General. Chamber of Commerce repre- sents all branches of com- merce and industry and ircludes barking, skinning, insurance, commercial and professional services. Its mein aims are to foster trade and industry, to pro- tect the traranction of bu siness and to arbitrate in commercial disputes, The chamber is a member of the International Chamber of Commerce and the Federation of Commonwealth Chambers of Commonce.

There are other organi- zrtions such as The Feder- ation of Hong Kong Indus- tries and The Chinese Manufacturers Association of Hong Kong, which helop to ptomote trade and pro- ductivity.

生物(廿五) 梁采華

BIOLOGY

(25)

Unit NINE: Genetics

Revision test 9

I Multiple choice questions: 1. Some fruit flies were

released on an uninhabited and windy island. After Several years all the fruit flies on the island were fast runners with very small wings The result of his change in characters is due to

(1)

constant

use and disuse

(2) permanent changes in

the genes

(3) natural selection

A.(1) only D. (1) and(2) only B.(2) only E. (2) and (3) G.(3) only

only

2. A hybrid fruit fly with

normal wild type wings was crossed with a fly having underdeveloped and shrivelled wings Of the many offspring half had normal wings and the other half abnormal wings. Which of the following are true statements ?

I. Flies with normal wings

are the dominant factors II. Flies with normal wings

are the recessive factors. III. Flies with abnormal wings

are homozygous

IV. Flies with abnormal wings

are heterozygous

A. I and II only

B. I and III only

C. II and III only

D. II and IV only E. II, III and IV only

3.The unit of genetic mater

ials is called a gene which is actually a

A. Protein molecule B. Amino acid

C. Polypeptide

D. Deoxyribonucleic acid E. Ribonucleic acid

Tallness in gen plants is a dorminant factor. If two tall pea plants were cross- ed with each other, which of the following results. is are never observed 2 I. all of the offspring

are tall plants

II. all of the offspring are short plants III. half of the offspring

are tall plants IV. a quarter of tlie off-

spring are tall plants

A. I and II only

B. II and III only C. III and IV only D. II only

C. all are probable results 5. The lack of pigmentation is the result of recessive gene and normal pigmenta- tion is the result of its normal gene. Two normal parents have an albino child What is the probability that another child of the same. parent is a normal one? A.0%%

D. 75% B. 25

E. 100% C. 50%%

6. Which of the following

statements concerned heredi- ty are true 7

I Not all characters are determined by genes

II. Phonotype is a term de-

fining an organisa by its observable character- istics

III. Alleles are pairs of genes which lie at the same locus on a pair of chro- mosomes and they affect the same characteristic in the organism

IV. A dominant character is.

one which shows a ouly

in the homozygous condi~ tion

A. 1 and II only

B. I and II only

C. I and IV only

D. III and IV only.

E. I, II and III only

7. Tallness in pea plants is a dominant factor. Self- fertilization of tall pea plants would give ·

A. homozygous tall offspring

only

B. heterozygous tall off-

spring only

C. both homozygous and hetero-

zygous tall offspring

D. 25 short offspring E. 509 short offspring

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