1968-04-06 — Page 15

育教健華

百三第四第

日九初月三年申戊

1968

大題額習專滷2

化學科 (廿三)

·林錫衡。

複習題十三

複習項目 化學計算(三)

(1)某氣体在空氣壓力為740mm 及25°C時

排水收集得 600毫升求在標準狀况下 此種乾燥氣体之容積(25°C時飽和水 蒸汽壓 23.7mm)

(2)一種有機物含C64-9%,H13.5% 021-6%,一升此種氣体重2.42克

(100°C, 760mm)求此化合物分子式 (13) 5克鈉溶於水在17°C,740mm時生氫

若干毫升

(4)在某一情况下60CCA氣体擴散一容

器需時10秒在同情况下.480c.c. 壙散同一容器需時20秒,求A分子量。 5)混合氣体含CO,H2及O2共150ml.通電 燃燒後得体積 95ml 以 NaOH 吸收後 餘氯体45/此氣体能助燃。以此紀 録求混合氣体中CO H2 與0.各佔若干, (6)20c.c.無体碳氫化合物與80cc 氧混 合通以電花完全燃燒後氣体体積為60 CC 經 KOH濃溶液處理後餘氣体20C.C. 麒化合物之分子式為何,(設氧過量)

複習題艹=解答

(1)解

設銀當量為E

N03 當量:14+16×3=62

35.5

根據當曇定律立得方程式.

0.51

-

E+62

0.4305

E+ 355

∴E=108.0(答)

15°C:750mm時氫280ml 在N.TR時

1250*280

(273+15)

設金届之當量為E

0.28

262 mi.

=

克

11200 ml.

260x4

=

273

E= 11.9

(2011.008. 3 1.008 ☆ NTP)

#5#* 22.4472 = 11.24

設金區之原子量為A,根据杜龍柏事

定律得

A = 0.25

原子價:256

精確原子量

=25-6 (大概)

12(取整数)

= 119 × 2 =23·8 (4)

(3)解溶液總重:175x1-24克

= 2/7克

合KOH重:217克×25%

54.25克

(2)解,主石灰石中含als w克

CaCO3 + 2HCl → CaCl2 + H2O+CQT

OI-6APR 1968

CITY HALI

日六月四年八六九一联公年七十五堂民

報 白

懲

WAH KIU YAT PO

升學困難又一現象!

,將過困難

畧具名氣各中學招生 家長多設法爭取學位

〔特》由於不满現有之宮立,助 世行,如道潑水潮 女升學問題 學生家長多關心 名 在中學學位不敷供應下 子 本年升中試考生達三萬七千多

入,津貼式禄助中學攻讓者,就估至 十零六獲得升入中學攻繳,但其中溏

【年4月之小學校畢業生,對百分之七 依照教育年級资料僻示;在一九六六

聖多瑪書院

灣仔踢遣鬼多耶英文婚院,(跟

慶祝兒童節

商上非會考的觀稷。 酀一隔左石,則供應藥師姚際 夫人及校長夫人孙別:拖油杬。 華,一定濃湖配升學的上泳嘿你,一般估計 ,及各師指出名此獎品黃多,花的主監 J-沙的小學畢薟生,蔥:萬七千多苦 爲幸運抽獎。由王監督∴好,易校長央網 付出之費用,就學私立學校以完多多姿。艾軍行交換禮物,並由淡方 ! 4綮生,乃須升壓到私立學校去攻體,幼稚園縑生集楂湖浦兒童節複詞,唱兒童 二语管已督提高,惟大多數學生仍須要,古典,戀,發簧,活到,音樂, | 潘3!校畢業生之百分之二點六,其餘之一,聽者劾來,爭由劉哲障校,歌詞,由 「此,墨升入政府,補助及津貼的實用中一對兄筮面之意義,兒童本位敎育之內容, 中激發學程。至於今年參加升中入 價傭大批禮物分證各小朋友。發後,節日

另一工業中學攻寶非廳會考課程者,佔全兒童對時代應有之跑識及蓄力,穿微博 |入4:歐府補助之私立中學學位攻讀的,則王淑降,校長鹤世醒,及各悅悅,全校教 上到資料又照嘿,小學畢業生的升學 幼稚園各班級學生世任,有土風舞,現代

「部心!校畢業生百分之十五點六,能進2日舉行堅視雙誠育過歌大会,阿有監督。 全部小學日校畢業生百分之二, 蹤及學生近千人。王淑陶監會散開會, 袛米。游蕾開始,怜項節目,但由小學及

升學,也自學位就業。

̧

*、都尖期今秋绝大部裔小摩唱遊

于此𥚃灣况,目前已有不少家長們

他借其子女升學打体而在煩惱中

一些始招生,他們爲陽能把子女濟進 , 以近日已有不少被他們明爲理想的學

華僑書院暨校友會

七日上午春季遠足

「名真的有隔變排像潑,此可知所長張 惡,嘗聞選等學校招生時,輪候預報 0 的大默程有以千計,名邵意少的,中部的,科憂六元,直邊驚費在內,小薇半費茲證 帝比一名八名亦有之,而報名投考入學一山,大德福監獄登記統改。多加者:每人 雪,名細有限,有些僅招收二十名,粉嶺婆遮舢縮午餐,繼粺上水,元朗,實 唯外,此類有名望的中學,每年招生 沙田、大埔、殼似尾額淡水湖工程,由 此「名梨」的墨校升學,乃霋出七)日上午九時,在佐敦道赐顧文英镇 辦賽季還足,恐將彩界,念促進戲院師生一 【 俄瘸地類會,燕該院旅行寡本出额。沿途 與校友情誼共冶,同樂苴心。索於本遇C 〔特匦〕俄店院獻校友會,即合主

·定京處·謝平山,爾括;二四六七六

; 許多都聽到一名在小學的孩 魔女行取「好」单位升學之用心良苦。蕙青八電話;七三五八二{一凵;校本部门建

括:八二一〇七四),楊惲生八電話:

一,但例力之下也都碼讓他們盤織升學- 努力機中,對那些精持名望的印刷學位、O九):李克強(電 決心人士翻爲,中學教育仍屬一項基定下月召開會員大會,改跳迷監事。〔 ,從在超亂倫難,並不過直立刻使之就業 八一五三):李謙秋(電器:八七二七 洽詢。又核院校方極拳傳出敬「黃大校友

析六育,尤以中一至中三的落段,一枚冊一。

的时期中晒

英文中學會考試題預習專欄

地理科

(廿三) 劉玉領。

Geography (23))

39. Describe and account for the movement of surface,

water of the Pacific Ocean.

There is a series of horizontal movements of water across the surface of the Pacific Ocean. The circulation of the main Pacific.

currents between the equatorial and the temperatapgions

is clockwise in the northern hemisphere and anti-clockortare in the southern hemisphere. These two circulations approach one another in

quatorial latitudes, so that westward-flowing currenta are found immediately north and south of

eastward-flowing counter current. The two westward currents, the North and South Equatorial Currents are induced by the surfed drag of the trade winds of each hemisphere. The oroduce a piling up of water on the western side of the oceans and some of this returns to make good the loss of surface water from the eastern side, thus giving rise to the Equatorial Counter Current.

the

In the North raclic Ucean, near Philippine Islands the North Equatorial Current is partially deflected southwards and enters the Counter Equatorial Current, but the major part turns north wyd protbeds as the Kuro Siwo,- a warm current, past the

islands of Japan and then eastwards as s drift which is, howevery less extensive than that in the North Atlantic Ocean. This hest wind rift sets southwards in a series of off-shoots, the most easterly of which is in the neighbourhood of the Hawaiian Islands, Another surface stream originates to the south and east of the Aleutian Islands, this water comes south and swinga east, and then bifurcates into the northward-flowing warm Alaska Current, and the southward-flowing California Current which is relatively cool, There are cold southward flowing currents off Kamchatka in the north-west of the Pacific.

South of the Equator, the South Equatorial Lucrent is diverted south and forms the warm

outhward-flowing East Australian Current, the waters of which in part enter the circumpolar West Wind Drift. The configuration of the coasts of southern Chile creates a deflection some of the west lad drift that moves north as the cold Peru Current. This markedly cald Peru Current also receives water of Antarctic origin moving northwarda

LIBK

Okean Current at the Pacific

10. Account for these:

Smutty. Mestrarties

Marth East

Trades

South East Prades

West wind write

word warrant

Magnetis

Prailing winds

(a) Exceptional high tides usually occur on the

dates of the solar or lunar eclipses. (b) The Mediterranean Sea has a higher salinity

then the Baltic Sea,

Ansa Tides are periodic rise and fall of the level

the seas and oceans. The major causes of this phenomenon are said to be the gravitational attraction of the moon, and to a lesser extent that of the sun which is farther away.

Sun

教

An eclipse of the sun is caused by the internosition of the moon when it is in line. between the sun and the earth; an eclipse of the moon is caused by the interposition of the earth hen it is in line between the sun and the moon.

ither da te, the moon, sun and earth are atly in the same straight line, either in

Junction (new moon) or opposition (full moon), so that the gravitational effects are complementary the combined pull of the sun and moon results in very high tides and equally low tides. The amplitude is exceptionally great. These are called apring tides.

Spring Fide of Solar Golipse

EARTH

Spring Tide at Lunar Eclipse

EARTH

(770000%

(5)解

100克

约克

100

22.4

4.09

w=180元;

石灰石之純度:

2744 4.094

This figure 8' circulation 01 Lne oceanic waters is due to a combination of causes) (a) Difference in density due to variations in

temperature or salinity:

Currents caused by allierence in temperature are known as convection currents, ware water of the equatorial regions flows towards the polar regions, where it is cooled, sinks, and returns along the ocean bed, as a botton current, towards the equator; it then rises to the surface again.

Salt water sinks below fresh water with the result that minor bifurcations of surface water enter the partially enclosed seas from the large oceans with a compensating bottom creep of salt water in the reverse direction.

30) Prevailing Winda;

18.2

x100%

20

91% (答)

含x% 金氣息與1克費結合需X+

1

A 42.9 57.1 429=0.75

B. 27.3 72.7373 = 0.376

與一定重量氧結合所需x之璽在

两種氧化物中是25/(簡單整數比) 符合倍比定律(內容見上期解答)」

若A是X20

則依上表結果知B應為XO

The Trades and westerlies carry the waters with them along the regular patha they tread, so that in high latitudes; the currenta move north-eastwards, while in the equatorial latitudes, they move westwards. (c) The rotation of the earth on its axis: This

03 uses some deflection of the currents in

the same way as it affects the deflection of the planetary winds.

(d) The shape of the land masses. Topographic

configuration prevents the through-paasage

of almost all of the regular streams of aurface cceanic. water except that of the circumpolar west wind Drift in the Southern Hemisphere. The currents are deflected north and south, by the continente à margins.

(b) The salinity of sea water depends mainly on the amount of fresh water added by rivers and rainfall and the rate of evaporation.

The Mediterranean Sea has a very high salinity (40%). It is partially enclosed, and its watere do not circulate freely with those of the open ocean. It is in a region of rapid svaporation and there are relatively few rivera to add a supply of fresh water. The one really large river, the Nile, adds less and less water, year by year because of the increasing demanda for irrigation purposes.

The Baltic Sea contrasts strongly with the ' Mediterranean. Though it is nearly enclosed too, it is in a cooler region with a low rate of evaporation. Some large rivers, namely, the Oder, the Vistula, empty into the Baltic, and numerous streams flow from the snow-capped mountains of Scandinavia, bringing a constant aupply of fresh water. As a result, the salinity fells below 326.

Questions for next week

41, what do you mean by the awing of the wind

system'? Explain briefly ita causas and its

邓

effect on the climate of California.

42. (a) Define these terms: Mean Daily Temperature,

Diurnal Temperature Range, Ralative Humidity.

Name the instruments with which these dru 1 associated and describe how they work.

(b) dxplain why the greatest annual rangea of '

temperatures are not found at the poleg bus in the cool temperate regions about 60°N.

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