23 MAR 1968
考數備藥
三弟張大第
日五十月二年戉言
WAH KIU YAT PO
CITY
A.
HALL
0968
英文中學會考試題預習專欄
1522
地理科 (廿一)
•
劉玉領。
%#$%$#$%$#$% 3 ## $$$ #34$ #SLS #SÉS#SF3 #3%$#3%3 #873 #5%5 #$%8 #$%$#
*#$%$#$%$#$%$#$%$#$%$#5%8%$#$#E#K#$%$#8%$#$%$#$%$$%$#$%=%s a
8三廿月三年八六九一股公年七十五國民中
((c) A rift valley 28 nžually steep-sided and ria E-
floored though the original profils may later.
be concealed by alluvial deposits. Such a valley is long in proportion to its width, on) the other band, a river valley usually possesses a V-shape transverse cross-section which may resemble a deepened V in the upper course of a river, a widened V in its middle course, or a much flattened V in its lower course. The sides of a river valley are gently downward-sloping as opposed to the steepness exhibited on the sides of a rift vallev
more
1968
青的試題複習
化學科
(廿一)
·林錫衡·
複習項目
計算(
(1)氯酸鉀之溶解度:-20°C~37.5克/30°C
10克在80°C時飽和氯酸鉀溶液275 克溫度降至30°C有若干克沉澱產生? (2)某金屬X有三種氧化物其中氧佔量分 别是:23.5%$31.6% 48.0%求证其符合倍 比定律。
331150克基金屬M,於氯中加熱成2.925
克之氯化物求M之 M所佔百分率
又求氧化M邮
複習題廾解答
ㆸ(1)铁器遢潮濕空氣會起如下之反應
4 Fe + 3H20 +302 → 2 Fe2O3° 3 H2O 生成物是一種鬆脆的物質,此作用是 為生銹鉄銹較原有的多了玺及水 故重量增加、
(2)普通紙張是用植物纖維經化學方法 處理並用還原性漂白劑漂白其天然 黄色素而成在日光下晒後已被票 白的色素又復氧化回復原狀後又 黄色!
(3)氣体燃燒者有火焰,腊燭燃 受熱液化氧化方始燃燒因 是氣体故有火耀木炭是固 -
足則燃燒成二氧化碳
氣~
燃燒的是固体非氣体故無火燭。 (4)煤氣的主要成份是氫甲烷一氧化碳 其中一氧化碳甚毒易與血液中的血 色素化合而使血液失去輸送氧的功 能,但燃燒後則成無毒的二氧化碳、
2 CO+O2→ 2CO2
fläorrt shy! (21)
35. (a) Ocate"the"rift valleys of East Africa on al
aketch map.
(b) Suggest a mode of formation for it.
(c) In what ways does the appearance of a rift valley.differ from that of a river valley2
Ars714)
The Ar
Med. Sea
\Ktst Valley"
¿Dond Sen J
Red]Sea
C.yVietorie
Audif
Indián
Traga
Ocean
yi ka
joc: Bidea of the rift valley;
(b) A rift valley is a harrow trough formed
between parallel faults, which throws in opposite directions. There may be a series of step-faults on either side of the trough, or the sides may be clean-cut as a result of the downthrow along a single major fault on either side. Tangential forces rather than radial forces are operating. Fault lines develop where the rocks have snapped under strain of genaura, Tension in the crust a have pulled the two sides apart, leaving the centre to subaide; or compression from either side may have thrust the masses on either side higher than the central block which may also have been forced down.
HONG ON
(5)硬水是含有可容性鈣鹽或鎂鹽的水 與肥皂作用會生成不溶性的鈣鎂脂 酸鹽形成沉澱是為皂垢,不起泡沫要 待鈣鎂鹽全部沉澱後才起泡沫故浪
肥皂。
CaSOk+ 2C7H35COONa!!
"MgCl3+2 C1 Has COONa →
(Cp His C00), Mg ¥512 Naci 汽鐵中若用硬水則煮沸時所含之鈣 或鎂鹽沉澱出來積聚汽鍋及汽管 内壁而结成一層外殼稱為鍋垢鑭垢 導熱不良使汽鍋耗費燃料,而且受熱 不均而易引起爆炸
Ca(Hc0y),→ CaCO3 b + H2O+COT 硬水中的硫酸塩成氯化物因水解而 生的酸對汽鍋有腐蝕性。
∏(1)銅鹽溶液加氨水生成氨氧化銅是瀏
藍色沉澱
"Cu" +2NH4OH → Cu(OH)2FT 2NH4* 氫氧化銅與過多氨水又起作用生成 可溶性的氢氧化四氨鋼生废深藍色 溶液..
Cu(OH)+4NH2OH →→ Cù (NH])4(OH)2+4H2O (2)硫化氫之水溶液久置表面與空氣接
触氧化產生硫
ZHIS+2→ 2H2O+286
碳不溶於水乃形成一層薄膜
(3)鲜是活潑的金属輿稀酸作用可置換
2n+ H&SQ → CaSO4+ HzT
濃硫酸是氧化劑,可使鋅氧化而本身 則還原成二氧化硫
Zn+ 2H3O→ Zn$O&+ $0.T+2H2O
Formation of the Rift Valleys
·} Before Sifting
E. Fidtoria
A1
fault.
Toneron.
IBE
鋼是不活潑金蛋其電動序在氫之下 故不能自稀硫酸中置换氫。而稀硫酸 不是氧化劑,不能使铜氧化
濃硫酸是氧化劑,能使銅氧化而本身 則還原成二氧化硫
Cl+2H2SO→ CuSO4+ SO↑+2H2O
(4)通二氧化碳於澄清石灰水中生成碳 酸鈣,碳酸鈣不溶於水成白色沉澱物 因此石灰水呈混灞
CO2+ Ca(OH)→→ CaCO2l + H2O 通運量二氧化碳時,則二氧化碳與原 已生成的碳酸鈣及水作用生成可溶 性的碳酸氫鈣,因此溶液又復澄清 CO2+ Caca + H2O → (Q (MCO3)2 (5)鈉是苦活潑的金蛋,在空氣容易氧化 成氧化鈉與水起劇烈作用而成氬 氧化鈉與油則無作用,因此應貯於油
..
«Ne + 0, +32 Na20|
ZNa+2H2O+2NaCH+ HT
黄磷易氧化生然而其燃點又甚低答 在空氣中自發燃燒發生危險。它興 水無作用故硿水中以隔離空氣免起
36. Write an`account"on"the work of undergrowɑ water
in a limestone region, making special reference to the development of the characteristic physical features found therein,
Ans:
Limestone is a rock consisting mainly of a calcium carbonate: 1... it is calcareous. Calcium carbonate is insoluble but this compouna is converted by rain-water into calcium bicarbonate which is soluble. Such limestones are fairly resistant to weathering other than by solution along the jointa, Jointa are numerous in limestone; thus most running water percolates down joint planes and along bedding planes, si that subsurface erosion is the rule,
Surface running water disappear underground through vertical openings called swallow holas, A group of such inlets will lead to a caverni below. The joint or joints below are enlarged by further solution and where streams persist in their flow, there is a large amount of chemical solution which results in the opening up of a cavern, Limestone caverns form a series of subterranean, chambers connected by underground streams.
Frequently caverns show the development of` Stalacties and stalagmites. A stalactite is a pendant mass of calcite hanging vertically from the roof of a cave, deposited from drops of water containing calcium bicarbonate which have seeped through crevices and joints. The calcite is deposited partly because of evaporation, partly because some of the carbon dioxide in the water escapes and so part of its dissolved calcium bicarbonate is changed back into calcium carbonate. A similar mass to a stalactite, usually more stumpy, growing from the floor of a cave, is a stalagmite deposited from drips from the roof. This forms immediately below a
talactite, so that they may ultimately join to form a single pillar or column. Stalactites are usually long and slender, but stalagmites are wider and shorter.
If the limestone rocks rest on impermeable, rocks then this water will reach the surface again where the two rock types meet the surface,! The water may issue out as streams or springe.
kave
邂
LIKESTONE
IMPERVIOUS
wallow hole
cavern
staðagružbe)
St - stalactites.:
--
pillar
Questions for next week
38. How does the sea carry out its verk or erosion and
deposition? State the formation of tare depositionsi features and four erosionsi features which are
represented in Hong Kong.
作用。
2+306→ Pao或
Put 50,7 P4010
(6)硝酸是氧化劑,二氧化硫是還原劑二 者相遇起氧化還原作用生成紅棕色 的二氧化氮
SO2+ 2 HNO3 → H2SO4+2NUT (7)硫化氢與二氧化硫皆是還原劑能令 紫色的高錳酸鉀溶液還原成無色的 硫酸錳,但硫化氫與之作用尚生不溶 性的硫故溶液呈混濁。二氧化硫與 作用無溶性物產生,故溶液澄清: 5HǝS+ 2 KMnO4 + 3 H2SO4
→ KS04+ 2Mn804+ 8 H2O+ SSL
5502+ 2 KMn0z + 2H2O
→ K2$04+2MnSO4+ 2H2SO
(8)氯化銨加熱起分解作用 NH4Cl⇒ NH3↑+ HCl↑
氨較輕向上擴散,溶於湿石蕊試紙上 的水中或鹼性的氫氧化銨故試紙呈 藍色。
NH3+H2O→NH4OH
氯化氫較重向下擴散落於石蕊試紙 上的水中成蓝黲故試紙呈紅色
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