1970-01-10 — Page 15

育教僑華 買三筑版四第

日三初月二十年酉己愿滾 WAH KIII YAT PO 報日橋

10 JAN1970

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GEOGRAPHY (10)

一九零肠

試題預習專欄

1) Rubber is an industrial crop grown for export in

South-east ABiz.

化學科

(+)

林錫衡·

10英文中學會考試題預習專欄

t

六期星日十月一年〇七九一公年九十五國民華中

'to be seen whether natural rubber can over-

*oome the problem by re-planting the old trees

with high-yielding species so that the cost of production can be reduced.

B) (1) State the geographical conditions needed for

the growing of rice.

(ii) Locate by means of a sketch map, an importan

exporting area, marking and naming a port. (iii) Name a country which importe a lot of rice (iv) Examina the world trade of the commodity. /

Ans.

(1) Geographical conditions 1-

a) Relief: Rice is best to be grown on low'

and flat lands such as river deltas, alluvial plains, so that the paddy fields can be flooded easily. Hill elopes can be used if they are carefully terraced befor narrow stretches of level land are obtained

̇複習題

複習項目 化學式 化學方程式.

> *b*10*&M=18.54%, 5=

(1) Give the climate, soil, and economic conditions

necessary for its cultivation.

ii) Locate by means of a sketch map an important.

rubber producing region and print on it the

chief port handling the export of the commodity-

iii) Describe how the croo is collected and

prepared for export.

(iv) State briefly the problemin of the world rubber!

- trade,

Ans.

26.828, 0=19.35% H20=36-29% ** 其實酸式。

2

(3)分析葡萄糖得知其百分組成為C=40%,

0=53.33% ステ得其分子量 H=6-67% 為180,試求其分子式。

(3)已知碳化亞鉄樣品(含雜質,但確實不含硫) 中含硫30%,試求該樣品中含FES之百分 率

(4)用觀察法平撕下列方程式

(4) P4010+ H2O → H3PO4

(b) Fe + H2O + Fez Qq + Hz

(9) («G+ H2O4 Ca(OH)+ CH2

(d) Zn + NaOH + H2O → NQ2 Zn(OH), + H2

(5)用原子價增減法平街下列方程式 (Q) HNO3 + H2S →→ H2O+NOT S

(b) Cut Ha 504→ CuSO4 + H2O + 5027

~1466

「複習題八解答

(2)4 2 1537

2.

(3) 80克 24克 0.07克原子量 (9)29克:54 0.05克原子曩

(5) 58.5. (23+35.5=585)

136

62

253

(40+32 + 4×16=136)

(2×1 +1243×16=62)

(2×39+2×52+7x16=254)

325 ( (12+3+12+32)×2+207=325),

(4) 52 (2×354 =508)

090735 ( 1+136 =0,80735)

J

(8) 0.25, 0.5; 72, 36

(1) Hubber producing plante are found in tropical or equatorial areas of the world. For optimum growth and yield, temperatures with a mean minimum of approximately 75°F are required. The mean maximum should not exceed approximately 95°F as higher temperatures, unless accompanied by high humidity, cause, tooi rapid drying out with resultant ceasation of latex flow. For optimum yield, annual rainfalli should exceed 70 inches and be evenly

distributed throughout the year. A long dry • period inhibit growth, and excessively wet seasons interfere with harvesting of the crop.j;

Although rubber trees will grow under almost any soil conditions, providing the olimate is favourable, soil conditions. definitely affect optimum growth and yield," Soile rich in nitrogen are preferable, although

the other major elements, phosphorus and potassium, must also be available. Desp alluvial soils are preferable, although relatively shallow soils, if properly treated with artificial fertilizers and planted with nitrogen-fixing cover plants, will support good growth and yield. Good drainage in absolutely necessary, as rubber will not. grow with "wat fee".

An adequate supply of labour is essentia for the daily collecting of latex and its preparation. The setting up of large plantations from which we derive more than 95% of the world's natural rubber supply requires great capital investment, a high level of organisational skill, and 3 advanced level of technology

(11)

Chief rubber producing arech in

alays

b) Climater

(1) Temperature- it needs a high summer Cemperature with an average of 80°1 throughout the growing period.

(II) Rainfall - An annual amount of aT LEANT;

40 inches or its equivalent in irrigation is necessary so that the paddy can be flooded during the early period of growth.

o) Soil:- Rice needs a permeable rich alluvia' soil and an impermeable layer beneath ea that water may not drain away so readily.

a) Labour Much labour is needed, e.g. to

transplant to seedlings from the nurseży bad to the flooded fields and to reap the crop. The method of cultivation restrdots tie use of machinery completely.

(ii) Irrawaddy Delta of Bur

BURMA-Chief' paddy areas \

(2)2 3

(9)80

307

(^)

64

原支戳杜倫柏蒂定律

(11) 77

KILA (08335-5=2161X;

9

31.7

paddy areas

Rangoon

(2)54. 4

(13) 63:5 7/

(14) 17 ( 1.228: (180~1234)= E : })

(15)12

(60:40 = E : 8 ·

二解氧化錢6-641克念

4.675

1.9963

€ 6.69/Ž-4.4453−1·996 F. 鉄之當量為三

4.645:1.996:

E = 18.6 (铁當量)

懿的大概原子量: 6.47 0.114

56.

錢的原子價:55-1÷18.643 錢之精確原子量= 18-6 x 3

=55.8

1

އ

4. HE ZEZAHLE,, E-/- 28: 72

=63.63:36·37

元當量與原子價之相

等於原子量 数值,但原子價可

1虻同是一 1結合办有

不同的原ㄢ權

同當量

Rubber

Singapore

(iii) Rubber latex is obtained by tapping. Narrow lits are out in the back of the tree early in the morning and aluminium cups are placed below the incisions. Latex keeps on flowing out from the trues for about half an hour

bafore the outs become sealed up by naturs. The contents of the cups are collected later in the day by nativa workers and emptied into tanks in the plantation factory. Foruic acid is added to make the latex, coagulate. Hator is excluded by compressica and sheets of rubber- are formed by rolling and drying or smoking. The sheets are then packed into dales and trane ported by lorry to the port, where it 19 pumped and piped on board chip and aportad to other countries.

(iv) 95% of the world's supply of natural rubber

comes from plantations in South-East Asia.

Malaysia and Indonesia ero the most importanı producers, followed by Cambodia, South. Vietnam, Thailand, Caylon and India. On the other hand, U.S.A. is the biggest consumer and importer, Japan, Great Britain and Wost Germany are the other important importera. Tho world rubber market is' subject to periodio fluctuations. As the dezand is rising and the production iù proceeding at an even more rapid rate, there is always the danger of over production. Further move, nateral rubber has to face competition from synthetic rubber, the production of which has in recent decades over-takes that 'a' aztuzul rubber. It remains

(iii) JAPAN.

\(iv) The world trade of this commodity is almost

confined to South-East iwin which produce8 more than 80% of the world's rice. Some of the producers like India, Pakistan, China, Japan and recently South Viet-name have to import rice from other producers because of thair enormous home consumptions, Thailand- Burna, Cambodia, and recently with the intoduction of "miracle zice”, the Phillippines are important exporters, In recent years, rice from the North Anexioar countries (U.S.1.)and Mexico mainly) also enter the South-East Asian market.

inevere to last wesk Multiple-Choice Exercise

1) (o) a WM

3) (d) gour

2)(a) drumlins

(o) Enolssed sea-polar areas

100 fathom

QUESTIONS BOB NEXT WEEK

Wheat is a very important crop grown in the temperate grassland.

(1) Give the climate, soil, and economic

conditions necessary for its cultivation. (ii) Locate by means of a sketch map an importau >

wheat producing region and print on it the chief port handling the export of the commodity.

iii) Name TWO countries which export a lot of to

crop.

(iv) Examine the world trade of wheat,

3) Compare and contrast the production of sugar-cane

and eugar-beet under the following headings :

(i) conditions of growth (ii) methods of cultivation, and (iii) importance in world trade

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