1971-05-31 — Page 13

31 MAY 1971

CITY HALL

買一第張四第日八月五年亥辛醫夏

WAH KIU YAT PO

郭日僑華

一期星

日一卅月五年一七九一曆公年十六國民華中

育敦僑華

英中會考化學科

(HL)

英中會考數學A(二)答案

(a)

CHEMISTRY

LESSON THIRTY

Sulphur dioxide is prepared by the reduction of not concentrated sulphuric acid with copper turtiings..

2

Sulphur dioxide is very soluble in water and much denser than air. It is therefore collected by displac ing air, upwards. It is a colourless, pungent pas, which turns yellow potassium chromate paper green. As concentrated sulphuric agad. is used for the pres paration, the gas Is dry the residue in the last 1 black owing to side reactions producing cuores sulphide

(b) (1) Litaus paper is not affected by sulphur dioxide.

both are dry, but an presence of water sulphurous is formed, which turns 11tmus red

50%.

This shows sulphur dioxide, as an acidic oxide.

Sulphur dioxide combines with incandescence ITA lead dioxide. Lead dioxide, a very strong oxidiary agent, oxidises sulphur dioxide to sulphu) priox 101 whilst it is itself reduced to lead monosine The acidic sulphur trioxide combines immediately with

oasic lead monoxide to form white leap suin

Pbo

SUGGESTED ANSWERS TO MATHEMATICS

SYLLABUS. A

PAPER II (Continued)

8. (a) ABCD is, the square base of the

right pyramid

· [KAH € 70°

Calculate The height of the

pyrami ZKLA

Calculation:

Consider square ALMM.

1250

0 tan 20 cm.

x 2.7475

Concirler AKI

(1) the heat produced by burning signea how-

sufficien to split up sulphi diokide låto, "sulphur and oxygen,, Previously ignited sagnes in ribbon therefore continues to burn if lowered unito à jar of sulphur dioxide The magnesium curna into a white powder magnesium oxideme whilst yellow specks of sulphur collect on the walla of the jar:

2MgSO • 2μgo

This is one of the few cases, in which sulphur dioxide acte as an 071dising agent.

(Iv)On bubbling sulphur dioxide (a strong reducing agent) through chlorine water (a strong oxidising, agent), * redox reaction takes place producing a sixture sulphuric and hydrochloric acids↑

Cl

21,0 - 1,50

For the PREPARATION OF NITRIC OXIDE, the concentrated nitriɔ said is: diluted with an equal volume of distila water and poured through thistle-funnel on copper turnings in a conica) flask. *. colourless gas, nitrii oxide, u evolved and collected over water whilat

green tiquaðila solution of copper. ditrate, remaja, fo the flank T

Kuil NO.2

ONZ

THE PREPARATION OF AMMON TUM NITRATE SPOD matric scio

LIMONI VID LOVdroxide, ua another example of

SHACHANA cal essential than the

squirolecular proport vans. to chas case,

necessary, co Gaean Fungicator

sutomallicas lu; removeď

weareo

the

rme, solur von

Joncenrracco

trarazide; sofraAM

ve prepared by SA Log:

equal volumes of 886 ammonie This solution is saded to the

"Los of ammonium "Ai prate forozo Tevaporitéo, tỏ pola!. "crystal tiêstion, and aljoven, to codi The

potained are äried between filter paper

KH NO

HNO

LIMIT THE PREPARATION OF SOD TUM NITRATE from nitric acid Latin saample of the preparation of a soluble salt From utaac (0, by neutralisation 2h the caustic sodal "Since caust je soda, ve soluble in waterməklik

508aible to add excess sno ljuter wh off, an draș aus De $840 to show neo cad deutralisation LA CAN

slote

The nutrie agiária, aniutem, and added is small portion

co GODE CELS)ic soda solution th an evaporating basis. <ftar, che man iron, off each portion the riguroa

wo drops are reen outer rus eno. of che stirring wo placko on red and on blus, ly caus paper her first The red peper turna blue," Du?" after more acid has a

the pľue areous paper curnazred, indicatin en säded than troon such acio nãs been added. The solution is brought daca to the neutral paint by the careful addition of a little caustic sous solution, an

When the solution naa no decided effect on 11tqua: 0. either colours evaporated tir): drop

raken ou! 100-a-glass rod rapidly, solidifies on c00f1

The

whole solution is then set, sålde co, cool. After decan-

ting the other liquor," the crystals are washed :: „ 1 tb a ́small quanŝity of distilled water and dried betveće filter paper.

KaOR NANO.

13.(b) Dilute nitric and hydrochloric acids may be distinguisher

by the addition of silver nitrate solution to both acids Only hydrochloric acid will give a white precipitate (a) Please refer to any textbook,

(b) (1) Sodium nitrate reacts with concentrated sulphurici

acid if the mixture is gently heated. Nitric acio vapour is given off, and molten sodium hydrogén, sulphate remains, a

aNO HISO Nail50. HINO.

As nitric acid fumes corrode cork and runde, ; retort

ts used when this reaction is used for the preparation of nitric acid. At higher temperatura sodium sulphate is formed g NaNO NaHSO Nás • (IVO. ↑

This reaction, however, cannot be used for the preparation of nitric acid, because at the high temperature required too much of the nitric acie would decompose.

1)Dilute sulphuric acid reacts with iron filings tox

form hydrogen gas and a solution of ferrous sulphate,

reaction takes place in the cold, but may

speeded up by gentle sarmasig=

Tui)Concentrated sulphuric acid has such a great affin 4ty for water that it will remove hydrogen and oxy gen as water from compounds containing these elemen therefore cold concentrated sulphrute acid is added to orystalline copper sulphate, the blue. crystals are dehydrated and turn into the white Canhydrous "sal ta'

58,0

Since (x +

herefore,

Draw the

they int

(i) They meet at 11.20

188

20

40

60

30

10

50

i) Time = (12-10.30) hr.

Distance (6.

average Deed.

hr.

(114) goes km, while Y is resting, f.e. from 10:30

Total time (12.30-11.50) he Distance 2

The required average speed of

(2 + =) hr. per

3 km per hr. Ans

40 minutes

中中會考 中文科(二)一熊文江一

上期預習答案 (感供品之用)

1.會館無論給文之主要內容包括下列六點:

- AZUA CARTAZRINJ• 二)說明寫論文之低度——「審己人了,卽去個人之 • (三)批建安七子之曼敍——「三集長於夠強;徐新件有两低,然

走初心

·登萁,旡賦上思,幹之火狼、深度、圓、撤職,雖張些不過世,給於他交,添 BRAZZERS, 42EU • MBAMZNES. FAIO H 妙有出入酒,然不能持論,現不辭,以至于以期葳,及其新機、 (四)編文章之分類,前各跟之所宜———「奏廳宜雅*編論宣壊•銘謀借錢,篩味欲從」 (五)文場無篇主国絕对天中的『交無写宝環之清濁體,不可力術致,曾諾者

∵菜、曲腳均•衛菜同稅,至於引就不齊,巧批有素,即在父兄,不以移于游 (六)文章價值確「文章者,經國之大菜,不朽之客,年品有時雨辦,榮榮止于其房二 者必至於當期,未文章之無期。」而文章可以“不想史之辭」,不託規馳之 中國交學之批評之。

淺,毛詩序,雖當予早一篇,但確限於筮,而只能為交,則場及舒萬 論

對後來文學批笛影夠苦大,在中國文學批評史上,極有重要 国安七子,各有所長,正是「自從籤於千里,每亦足而並驅」於當地...

孔妝,字文峰,宜至少府,有名,天下矚目,然曹採忌而殺之。典南文,以智社

:

王然字啦,将尚中,少心邕所示,後以長安運氣,將恢姿,後確曹操,不 魏扁海中,並不以王樂長於洋城,其初证、登狀、槐狀、被恩等,雖提尔不過

徐幹,字仰長·魏得五將文學、端中除二十味箱,成一劵之宮,不以其交時有

REGpart, thaya RS BUT BETEJA EL -

•

BEAMENT WAS

甜、豬、小綫會將交俱,其文,機乎和而不肚 猫瓜李公幹•您休籤,碧丞相屬、曹現其交變,壯而不密云• 就算在「供深非響」中,所之交章見解,並有下列點

(一)分交章為基削,陰柔兩大類交者,天地之精英,而险陽剛之發出。

文章之至者

3次國確而在確定與實騶備,面番人之女,始雪

CE)柔一餐。而勝可;偏勝之種,異一有一絕無,而是用不足儒。柔不

「足綿柔,皆不可以看文.

(四)周文之天才的——人之學文,其功力所雄者,陳理鵓必明當佈置取舍、防潔麖肉

不失生,吐您由不無而已,文之至者,通乎神明,人力不及施出。

(一)隔剛陰柔之父,各有時撥

SCENARI

D

得隆險業之業者,則其交洲升初日,清風,如異,如麗、如器,如涵秫曲瀾

珠王之與山鴻鴆之鳴而入多輯:

-

C二》作者之性情形状、各的共文而有不同:

#XZRA002 #NGAN THE KIDS (三)赫維二而弗僱者,問證人之至文,請而區選定;個勝之極與及一看一组篇

或是翔不足感刑,永不足當柔,皆不可以 課文複習

(近代文)

題解

發業夠樂繫

作者生平

2.湖小說與實治之關懷

•是作者於一九

和茶之

【葉」就是具有「武 新小說18

*操偿小晓,重小說之 小晚在中國學術上,從來絕無地位,在交暴上锦作下學寫作品。榮盛超 交费可說明小跟之價值,以駕與賓沿極有關保·所靠治者,即社會 *此交影响當時國人對小說之铜钟甚大,當近代开张小蛇理的

九二九),宇刑,犹任公•牌取新粛人。年幼聰診,八歲 就學於雞*從能有爲學「公羊」眼•光粉 運動,但高解派人士反對而失敗,

中西學術,均有洪深查品,在各大员, 台之風格,學時號儒新文體,著有「黑手

「先案政治思想史」,「飲冰

MITHICAL

有能够提倡欄 入民國後,發踩

美行概验」,「中國近三百年學推史」

̇試題預

MEGET HEDLY!

BEZ TR134217

「敬藥與榮拳」即「實任心」及「趣味」何有關?

從社會黨選上,詞简小說之價值及北電光佛?

」一次

夏僑

1971 英文中學會考試題預習專欄

新光出版社主編 SUNLIGHT

PRESS

地理科

EOGRAPHY

PART C

PHYSICAL GEOGRAPHTH

LESSON THIRTY-ONE-

Polar Front of Convergence (Continuea).

OCCU

(十一)

The

So at suena level cola ary Air desplaces ene aar above ground, continuous ground is cold.

However this ideal wine system or faneláry circulation is far from being real1200 actual lorie comullions. The, never distribution of sand and sea betweep: ire morch and south hemisphere, much of the high and you pets

are disturbço, in the north, when the soutners or to approach sore closely to the simple pattern, because of

ocean surface.

Air Masses And Depressions, Air Masses (7

reponderant

Weather conditions in many parts of the world are depen dent upon the interaction of air masses, and the character of an air mass depend on where it comes the source region, 50 air masses may be classed as polar or "tronicat accora ing to the temperature at their source region; and may be classed as maritime on continental,

all as to these humidity When a tropical air mass moves polewardi teng De cooled

dar? by the surface over which it passes, and conversely mass, moving equatorwards will be warmed. up a change may cause the tropical air to become staple and the pe stable, and rain results.

Air masses from ocean surface onto continental eros, visa versa will also be transformed by the changes in cheir humidity. It is over the oceans that the interaction between air masses. is most likely co occur and the line at an ION moving air masses converge are known as fronts, when a pola air mass meets a tropical air mass, because of the Lfference. in temperature and humidity, with combination of earth rota- tion there leads to the format zon of a cyclone disturbance a

depression. Into equatorial regions amasses nove from north and south, and converge at the intertropical from, but as the opposeed air masses are alike in regard to both tem perature and humidity because of the similarity of them, sour ces, the subsequent formation of cyclones as practicalḥi une possible.

-IGNEOUS ROCKS

Igneous rocks are the products formed by the cooling or solidification of magma that formed deep within the earth. A distinction is commonly made between those which have crystallized far below the surface and those which solidifier from lavas that were poured out on the surface. Plutons.or

Instrusive rocks, which have cooled slowly unde, a cover per haps several miles thick, are entirely crystallines their com ponent crystals are large. Extrusive or igneous rocks, which have cooled more rapidly at the earth's surface are often entirely glassy or vitreous (without crystals) or partly ory -stalline and party glassy,

Composition of Igneous Rocks

The mineral composition and colour of rocks differ between the acid and basic lava. In basic lava the silm content is less than the iron and magnesia, so the rock formed may contain iron, olivine and carbon, giving a dir colour. These minerals are called ferromagnesian or mafic. But acis, rock contains much lime and alumina and silic. 1 These light-coloured or felsic minerals give the acid lava a whitish colour, Between acid and basic types there are rock of intermediate composition. A

(a) Quartz – is most commonly occur, in perfect erystalist

shows a hexagonal column. It is white, milky or even transparent. It is very resistant to weathering..

b) Felspar - Felspars are silicates present in igneous

(granite and basalt) and in sedimentary rocks (sandstone and shale). The pinkish one called orthoclase and the whitish one is called plagioclase. When decomposed felspars may, form sericite or a clay, In tropical coun-- trica the bydrous silicates of aluminium are removed by rain, leaving the aluminium ore called bauxite. If the clay is rich in iron limonite is forzea.

Micà – Mica is: in sheet form. It is used as insulator to

heat. The black pics is called blotite; the white one is called muscovite. They are easily eroded, but not easily weathered.

d] The ferromagnesian minerals are usually present in small

quantity and consist mainly the heavy, dark and green. ailicate minerals rich in dagnesia "and" iron oxides

a

Dolerite - Dolerite occurs in dykes and sills, and is of great

importance as a road metal because of its toughness, and. its capacity for holding coating of tar and for giving a good "bind. It is dark grey, sometimes nearly black in colour, except when the production of felpar sa hiRE. the texture is usually of medium to fine grala. Minerals: plagioclase and augste.

Pastures The nearer dolerite approaches gabbro, as the

texture increases in coarseness, the less em phatic will be latb-like form of the felspar. On the other hand, dålerite merges by degreg_ into basalt as the texture besusa fizete

Granite

Mineralss Quartz and felspar are the essential mungals.

The latter includes both orthoslase and plagiot clase. Quartz say form 20 to 40 per cent of the rock, and felspar up to 60 per cent. Mics of some kind is commonly present and may be a darkk variey like biotite, or the light mica macovites or both. Other minerals which may be present In different grantes, The large felspar content of the rock is reflected in the high percentages for "sode and potash, though sose of the latter helps to form mica; the low ferromagnesian con- rent. Ls to be noted. The high value for silica sesults in the formation of free quartz after the metallic bases have been fully combined with Pudicaid the rock is therefore oversaturated