REFERENCE LIBRARY
19 APR 1970
170英文中學會考試題預習專欄
育教儒華買二張三第 3
CITY HAI
十月三年戌庚醫夏 WAH KIU YAT PO
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中文中學會考試題預習專欄
GEOGRAPHY (24)
化學科
(廿四)
林錫衡•
複習題二十二
日期星日九十月四年〇七九一曆公年九十五國民中
子們容 是谁李密 熊欲- 明天 · 霧两無到生求
七賢五百此木十
天子,九醇向天將,幽之學茫今發而本
九菸年,莖共束行於九爲償於三
明七泡所他食
*目的是他在本港大學攻
之四千九百人,坻望一
計劃經他本人生
不會淸除大學學額缺乏
的現象,但起碼有共常
會路。們如於耙劃
|年
亦生
苦學學
於額
考生多,學位少,學校經費不足
本屆兩間大學入學試考生人數近萬
大學教育發展
而兩校新生學額僅一千三百餘 大學
難寄厚望
複習項目 化學平衡
(一)選擇題
(1)當化學反應達致平衡時
2.反應完全停止
上反應物質用盡
C反應物質與生成物質之質量相等
反應速率相等
N2+ 3 H2 = 2 NH3 + 22 K(al 2 * * 向右移動必须
2.升高溫度
6.減小壓力
心增高溫度並減小壓力
a減低溫度並增加壓力
(3)在一定情况下欲使反應速度增快可
2加入一種反應物
bthe
加
一種生成物
種反應物及一種生成物
d加入百催化劑 ®
(4)下列反應何者宜在高壓力下進行
a. Pls
PCl2 + Cl2
+ 2502+ 0 → 250
d Na2CO3+ H2SOu→ Na
(二)填-
題
(1)凡正逆兩方皆可進行的反應稱為
(2)影响化學反應速率的因素有
(3) 影响化學平衡的因素有
等。
(4)在 NH4OH = WHG* + OH* 平衡系中若滴
加酸液少許則平衡向.
移動。
1)說明溫度壓力對下列各平衡之影响
(a) 203 = 3:02+ 61,400 +
(b) 2 NO + 0; = 2NO2+ 27:800 €
複習題二十一解答
(2) Q (3) 6 (4)6
(6)d (7)d
1896.
(二)(1)氧氫水
(5)
(2)氧银增
(3)/./2升 31.75克 法拉第電解定律
(銅當量 31-75,氧當量 8
6:35
*3/75
X=1.6(克)氣重
NTP #32E16 22-79| 1.6.2015 22:44 × 32=1.124).
(三)(1) NaHCG→ Na++ HCOg
3.507
(四) (1) (NH4) SO4 → 2 NHGT + 50元
ZNH4OH
NHAT輿 OH 結合成不易電離的NH4OH 溶液中H+多於OH,故呈酸性。
(2) Na2CQ→ 2 Nat+ CO2
(五)(1)
ZOH + RHY
H2CO3
COF與H+結合成不易電離的HCO3 溶液中 OH*多於,故呈鹼性。
陽極
OH
陰極
Net Ht
濃度大先析出Ne+不能析出
結果
2 NaCl + 2 H2O
→ 2NaOH + H2↑+459
溶液自中性變鹼性:
陽極
SONOH
SO不能析出
4OH-48-
結果
2420+02
Cut M
隂極
Cut 優先析出
Cut + ze Cut
R CuSO水+ 2H2O
→2H2SOx+ 2 k$ + O2 溶液自弱酸性漸成強酸性
write an account on si... Malaya..
Tin is the cost important mineral sinad 25
Malaysia. The tin ore (cassiterite) is derived. mainly from the tin-bearing lodes and veins in the granite and adjacent rocks which form the Main: and Batang Ranger. Since. these mountain ranges were folded, they have been eroded and the "tan ore of the lodes and veins is carried down by rivera and streams which flow: westwards to the flat land. along the foothills. Such tan ore de called. alluvial tin because it has been laid down in the alluvium.
The tin mining area in mazaya stretches from Kedah southwards along the footiall of Ferak, Belangor and Johore. The Kinta Valley in the State of Perak 18 the chief producing area, being responsible for more than half of the total
The State of Selangor is the Becona production. important area with Kuala Lumpur as the centre
These two and produces one-third of the total. regions therefore produce more than 90% of Malayera s tim while the annual production 18 estimated to be 67,000 tons. Alluvial tin 18 also obtained from the Kelantan Valley of the eastern Lowlande.
DISTRIBUTION
METHODS OF TIN-MINING-
Dredging
OF
TIN IN MALAYA
The alluvial deposit le scooped out, by chain of bucketa let down from a dredge. The tin ore 18 then separated from the water and the waste alluvium is thrown out.
Gravel pumping in a small mine, water 18 pumped an then the loose material which
aalluvium and tin ore 18 carried by the water towards a pump where the water is sucked and the tin ore collected an wooden structure.
Dulane washing
This is a primitive method usually done by women. The gravel, containing tin ore, i mixed with water in a pan, It is shaken to remove the dirt and waste materials.
Hydaulic mining Jat water under high fresaure aa
forced out from pipes to strike against the mountain alopes to break up the: gravel. The water carr188 the broken particles down, to a large box for separation.
the sin ore is washed and treated Then it as called tin concentrates, and ia put into smallage, These bags of concentrates are then: sent to the emelting plants at Butterworth, Penang or Singapore. After smelting, the tan concentrates ward to be refined and then they become, almost pure
tin (more than 99%) and are then made into tin bricks. called rngot, each weighing about:10016, These ingota are exported to other parts of the world particularly to the United States and United Kangdom.
Give a geographic3. Thailand.
account on the Menam usin
The. Menam Batin is located in the central part of Thailand, extending from north tu south, The northern part of the Basin is a mountainous and foreat-covered region, und is drained by the Meran and its tributaries. The southern part of the Basin cone Luts of the alluvial plain and deltos of Nenam-`river. Because of the flatness of the land the area ie badly drained and the whole area 18 liable to extensive flooding..
Having a tropical monsoon climate, most parts of Thani and experiends the north-east and southù "west' monsoons. The northern part of the Baain. however, has a cooler climate in December and . January because of its northerly position. The whole Basin, generally, 18 comparatively drier since it lies in the rainshadow. The gountain range in the west lies across the path of the onshore south-westerly winde which consequently cannot bring: much rain to the central: Lowland. Only 40
10 50", of rain 18 received here.
Rice 19 the most important crop in the Basın. In the northern part of the Basin, it is grown in the valleye which are densely peopled. In the. plain section, padi growing 18 the major occupation and in the delta area it is almost the aole occupation though conditions for padi farming in Thazland are not entirely favourable.
极
後年委雞
增一時之攻向博、六安
国今安大六今伍,之的乏撞形NTEG
原的彩劇烈下数今不理能將,四足於?
扁三張第二頁)
O英文中學會考試題預習專欄
堅道英文書院主編
秘濟及公共事務科(廿四)
D⠀⠀ parking stampo
E computerized metara
The main economic function or a banking ayaten de
A to remit money abroad
B to obtain foreign exchange
C to create credit
"D to keep valuables for the people
E to ancourage people to save
Hong Kong businessmen can obtain insurancs for,
their goods against economio and political risks from the
▲
18% A
Trade Development Council
B Hong Kong Stook Exchange
C Hong Kong Export Credit Insurance Gor DOTATION
World Bank
Asien Development BanK
aubstitute for P.A.I.E. 18
▲ a life insurance policy
B
C
a current account
a oredit account
D a Tax Reserve Certificats
Ea Bill of Lading.
19. The maximum rate of duty, on ORTATAN
20
A. 20%
24% C.30% D35%
10oally made goods ze known as
oustoms-duty
Bexoise taz
C business registration tax Dprofits tar
Erates
This is because the rainy season in the Basin 18. short and the annual amount fluctuatee from year ta year In addition, the occurence of floods also affsots the harvest, After huge irrigation and drainage schemes have been built e.g. the barrage at Chainat, the situation has been improved Despite these disadvantages the southern part of the Basin is the rice bowl of Thailand especially the delta area south of Chainat. The cooler:: climate in the north also suite the growth of certain temperate crops Buch as potato, topato and.caulaflower. Around: Bamgkok, vegetables are "grown. Other cropa are also cultivated in the
south, like sugar-cane, maize, tobacco, cotton, kapok, castor "seeds, groundnuts, especially in: the drier areas.
Fishing 18 an important cacupation of the people living around the coast. Fish are caugh not only in the Gulf of Thailand, but also in rivers, oanais, and even in pads fields,
In the aorta, the forested mountains are a source of timber From there, teak is obtained. The trees are gawn into logs, pulled by elephante to the nearest river and made into rafts. When there re plenty of water in the river, the rafts are flosted down to Bangkok where the logs are Bawn into, timber.
Bangkok in the south Lethe larrest town in Thailand and is one of the largest in South-east Ala. In the north, Chiengmar as the important city, it is extuated on the Me Ping and is in the middle of an important, Pica growing area.
POSITION OF MENAM BASIN
Me Ping.
Koral
Bas
Land over 1,500 Feet
QUESTIONS FOR NEXT WEEK:
Exercise in multiple-choice objective questions.