頁二第張四第日十初月三年酉己屦夏 WAH KIU YAT PO
報日僑華
六期星日六廿月四年九六九一展公年八十五国民華中育教僑静:
1
()溶液呈中性
(3)氫興碳的結合應形成
[@)離子鍵
(b)共價鍵
(C)配位鍵
(d)不能確定何種結合鍵
[C
文中學會考試題預習
地理科(廿五)
·劉玉領。
COMOURAPHY (25)
•$£$ => 5%$#3+3 #545 #8%$#$%& #8 %3 #3%3 #543 #5%$#**#$%
一九六九中文中学会考試預
(14)當硫成硫離子時可能是
(a)失去電子
化學科 (廿五)
林錦鮮
複習題二十五
複習項目
逾期輝與原子結構
選擇題
(〉下列各組元素在週期表中屬於同一族的
是
(2)氧、硫、碳、矽
(2)和元素化學性質關係最密切的是
(a)游電子数
(b)價電子数
(C)臂子数:
(吃)中子数
MM
(3)普通氫原子核中有
(a)雪子和電
(C)只有嘴子
(d)只有中子
(b)與別一種原子公用電子 (C)質量數有改變 (4)最外層藥為八電子
(15)下列那一分子中有電價鍵反共價鍵
(A) HCT
(b) NaOH.
(E) NaCl
(2) H2O
(16)下列那一化合物憑非极性化
(a) H2 F2
(b) CaCl2
(C) H2O
(d) CzHa
(/7)原子序是19的元素其性質與原子序為何
的最相似
09.
(4):15
(18)一原子的電子排列如
表中應在
(9)第七週第五主族
(6)第七週期第二主族
(C)第五週期第七主族 五週期第一主族
81818.7在週期
40. Rubber is an industrial crop grown for export in
South-East- Ä#ă.
(R) Jive the climatic soil, and economic conditions
necessary for its oultivation.
Loonte by means of a skotak sap au AMPONOMIA N rubber-producing region and print on it thr chief port handling the export of the
commodity
Describe how the crop is col2sated and prepared for export.
(a) State briefly the problems of the world rubber:
trade.
Rubber producing plants are found in tropical or equatorial areas of the world. For optimum -growth and yield, temperatures with a moan
minimum of approximately 75°F are required. Tas ROAD RAZİSus should not exosed approximately 95 ↑ as higher temperatures, unless Accompanied by high humidity, cause too rapia drying out "with resultɛat cassation of latex flow. For optimum yield, annual rainfall ̇ahould exceed 70 inches and ba evenly
distributed throughout the year. Protraoses dry periods: inhibit growth, and exossaivaly vst Beasons interfere with harvesting of the crop.
Although rubber trees will grow under
一原子之原子序是79,質量数是196,其 中子数為
(19)一原子的電子
2,8,13,2應屬
(a)金属元素
(6)非金属元素
(a) 79
(6)196
(C)/17
(d)275
(5)一原子含中子 69,電子 50 共質量数為
(9) 69
(b):50
(C)
19
(2) 119
已知一元素的原子序元素的原子結構大
致可知除了
(2)原子核内的质子数
(b)原子核内的中子数一
((C)游電子數
的價電子數
(7)某元素的原子序是原子量是ㄜˊ 其原子
中含有 ※1967年會考題)
(9) 91 3 11 † 3 12 € 710
(6) 311 3:11 ₤7:10
(C) § 3 11 7 3:10 ☎ 7 11
喷子10沖子”電子11
(8) - 種元素的各同位素
(2)質子数目數相等
(b)中子数目相等。
(C)暦子数目相等,中子数目也相等
(C)具有相同原子量
「(9)下列各組数字代表元素的原子序那一組
全是稀有氣體
(a) 2 7 17
(6) 29. 18
(C) 8, 10.18
(d) 2, 10
(10) § 317 Þ 3 18 € 3:18 HT BE #45)**
(a) 原子
(b)分子
(C)陽離>
()陰離子
一原子的電子如,2,8,18.7 排列最常呈現 的原子價是
(b) -]
(d)
(12)一元素有二個價電子史
(C) +5
(2)形成陽離子
(b)形成隂離子
(C)不活潑
(C)過渡性元素 健中性元素
(20)下列氫氧化物中何者昼两性化合物
(a) Ba(OH)2
(b) AI (OH)
(C) C(OH).
複習題二十四解答
(6) d
ᄑ(1)氧氫水
(3)氧銀增
(3)6 (4) 6
(7) d (8)6
(3) 1-12 # 3/25克法拉第電解定律
(铜當量31-75.氧當量8
31-75
# NTP 3222.44
7.6551 12 x 22.45=1.12+
III (I)
NaHCO3 → Na+ + HCG
(2)
Fe:(504)3 → 272 +3805
III(I)(NH4) SOY → 2 NHAT
2 #20
與OH結合成不易電離的 NH 溶液中H+多於OH 溶液呈酸性。
Na2 CO2 -> z Nat + CO′′
20H
H2CO3
CO 與H+結合成不易室雕的H& CO. 溶液中OH多於H 溶液呈鹼性、
陽極
陰極
大優失析出
201
結果.
(2)
Nat H Na+不能板出
Ht+
2H→
2NaCl +2H2O →2NaOH + H5T+ CST 溶液自中性漸變鹼性
陽極
SOK ON SOFATE CUM CU✯✯✯
結果
2 CuSO4 + 2120>2Hs S©q +¿Qu¥ Q1 溶液自弱酸性漸成強酸性
almost any soil conditions, providing th plimate is favourable, soil conditionLa definitely affect optimum growth and yield. Boils rich in nitrogen are preferable, although the other major elementa, phosphorus and- potassium, must also be available. Doop alluvial soils are preferable, although - relatively shallow soils, 12 properly treated with artificial fertilisers, and planted with nitrogen-fixing cover plants, will support good growth and yield. dood drainage is absolutely neosssary, as rubber vill not grow with #was feet.
in adequate supply of Labour is semantis for the daily sollecting of later and ita preparation. The setting up of large plantations from which we derive more than 95% of the world's natural rubber supply requires groat capital investment, a high level of organisational skill, and a large store of technical know-how.
PERANG
Rubber
SINGAPORE
Rubber Plantations in Kalava
(0) Rubber later is obtained by tapping. Harrow elite are out in the bark of the tras early in the morning and aluminium cups are placeŭ below the incisions. Latex keeps on flowing- out from the frase for about half an hou before the cuts babama sealed up by nature. The contents of the oups are collected later in the day by native workers and emptied inta
tanks in the plantation factory, Formio mold is added to make the later coagulate, Water, is excluded by compression and shɗster of rubber are formed by rolling and drying or anoking. The sheets are then packed into bales and transported by longs to the ports for export. Some of the latex is carried in liquid form in railway takers to the port, where it is pumpad and piped on board ship and exported to other countries.
(a) 95% of the world's supply of natural rubber
comes from plantations in South-East Asia. Indonesia and Malaysia are the most important producers, followed by Cambodia, South Vietnam Thailand, Ceylon and India. On the other hand, U.S.A. is the biggest consumer and importer. Japan, Great Britain and fest Germany are the other important importers. The world rubber market is subject to periodic fluctuations. is the demand is rising and the production aped up at an enormous rate, there immag always the danger of over-production. Since the economic well-being of the natural rubber producing countries is enhanced by the maximum production and sils of rubber, number of international agreements have been concluded in an attempt to keep the price of rubber stable. Furthermore, the competition "of synthetic rubber is a menacing issue as aynthetica do possess definitely superior qualifies in some industrial uses. It remains to be seen 17 this issue will stirls the natural rubber industry.
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