1987-11-12 — Page 19

育教聞港

頁三第張五第

惠史同鄉會

保護

日一廿月九年卯丁腦靈

報日僑華 四期星

日二十月一十年七八九一曆公年六十七國民華中

本港 新聞

【貸予東華三院五千萬

「會服務中必報名,查 樓下·聖公會沙田 親臨沙田新田邨格图, 對上述活動有興趣者可 「坐井食」協助推行, 活動並邀得香港著名之。

今日紂誰的另一項。 加的一千八百萬元,將硝予以贷款五千萬元, 度者引致的開支」,追故向政府申訴援外,

以支付一九八詣七五千萬元。一 與此同時,財務委積金計取代,曾中。

一月至十二月期間堵· 東華三院非供獄式 篩入进內。 : 以便補足所欠缺的數目

|迫加接款一千八百萬元一院的款項」。承招租盤 年中國來祗的越南非法人 身只能提供六千萬元, 尖計劃時所作出的建麟】 风會亦將考壐批准開設| 欠缺的蚊日一億一千 該等地點是居民於 一個經常帳新分局「從萬元。由於東華三院本區節期園舉行的绿化油 | 古蒪行動所需的經常門 止,自一九八七年十日舉行會議,討論在區 躪來心的越南非法入境八七年十月三十一日終會環境事務委員會的 處理,翼留及遺返從中最均月薪計劃的一九 【湯)油陡地區 會將於今的會議上考慮帳新分目「貸子東華三 油蔴地區會討論 一月一日起由供款式公 內繪添花草樹木的地點

增添綠化點」

[港)財務官,爲批准開發非經常四一。

協助解決公積金計劃 ————大ㄦ 三

+ 屋宇地政署測繪處

就區內若干事項提出 | 開後的處理工作 小販管理及有關路面 閲書館臨時關閉,街

此外,部份委員亦

製圖組獲兩設計獎

議程其他項目向有

·者測繪處的製圖組,僭洲及探索古跡等,是次一的資料文件。 甜寕地政|實地觀察星家和设遊長 點問題及環境改善運動 反映本港繪製地圈優異成績,城內街道照明設施的地。

近榮獲商須具專業聲望卓月流六十週年花展

的地避及製戤設計獎,

表現出近年本港繪製地許舜華展出葵裡蕙艷

,做組今年與多

·際性的專業團雅激烈的枪念大典,

逐後,終於登對八七年

六十週年紀念香港插花發」,毎日展出時間

度英國裂學會製國設| 上午十時至下午八時,閉幕時間爲十一月十

一,有興趣人士到場參觀。許舜燁

游及約翰巴羅洛程專推花中心許舜華女士展出作品「葵裡遊艷」。

司 田,是一張第五號新界

磁裝圍優異獎狀。 一, 奪得裁計大獎的地

困,該地圍獲獎的開因 東北部第二版的郊野地

3,主要在設計上龍表達

在作品前合攝, 閻爲:草月流六十週年花展中許舜華女士

[草月

WAH KIU YAT PO

一人留下印象。

至於今年附載在

配合亦與美感,容易使

訊息,而地形,色彩的

一面及專區地圖外,還有

所製的地區,除郊區地

同等的優異獎項。

康宇地政署開箱

70上,而該組在去年亦獲

」,則榮獲優與無狀

「香港商外地購概况

導遊還園及指南,並有福建惠安旅港同鄉會

【各政府部門繪製的單

一元專題地圖,如環境保

賀蘞保欣獲CBE銜

「

:【港訊】香港惠安同鄉會,創會以來,

誰,選區界地圖 海港地』等。而製餐會務,促進旅居海外同鄉聯誼不遺餘力。十

作坭格,編纂、柏树、往參與盛會。 一組是負責設計,訂定制 月惠安染武古城建城六〇〇透年慶典亦組團前

設計符號、分色和最終 宝C BE鵰銜,六日晚假太古翠園酒家共 聚傘叙。黄保欣鄉詐鼓勵惠安鄉親,遒多路與

該會得慶賀永遠會長黃倮欣鄉榮獲英女

拼版的工作。

(瓶)

人復到英國海外製處 調,山六二年開始選 就方面有所損失,但仍覺得非常滿足。 早期的婴醫師在本港受可對香港社會工作後作了不少時間,以致在生

·,據該獄人士透露,香港社會服務之活動,他說自己雖然參加立法

意

故前

香儿非

議程,並吩能加投進,同鄉會這座橋樑,增進聯誼,互相支助與照顧 學院就讀。故該處正積 ·例爲偃積極投入基本法起草委員會的工作 鷗國際航攝及土地登粱有助益者,當義不容辭,對香港社會是一項同 極爭取香港有關的學位,资深歉呼籲旅居海外巫安同鄉,今後宜藉著。

全到外国深造。

預地許失 晚望 退欣爲者

其實,繪製一張地 從搜集資料對繪製完成 人。圖福建惠安同鄉會賀黄保欣榮獲C.B. ,便要花兩年時間。(E炒粉,廚爲名譽會長會紀華代表致送紀念品 今次獲獎,對技 黃光漢夫婦副主席會金城孫禮賢、黄柄用、會 那是晚出席的該會永遠會長曾紀華夫婦主席

·沙田服務中心

资者

城會

B百駱

1988中學會考

試題預習專欄

化學(七)

明遵出版社

MILL & DALE PRESS

Revision Exercises

for

Cert.Exam. (1988)

CHEMISTRY (7)

Question 10

(a)In the experiment as

shown below oxygen gas is bubbled

through some concen-

trated aquBOUR

ammonia solution

above which a

hot

platinum spiral is hauged from a glass rad.

Кана

rod

platinum spiral

(1)

oxygen

K

concent

rated

#queous

ammonin

solution

Name the substance formed at the

platinum spiral.

Write an equation

visits formation.

of (11) What would be observed near around the platinum spiral? Write an equation of ita formation. (iii)What is the

function of the platinum spiral? (iv) The platinum

spiral has to be heated initially. However, once the reaction be s started, no more heuting of the platinum spiral is necessary. Explain why is this 80,

(v) What would you.

observe if a few

of blue..

itmus solution is add

into the

flask at the end

of the reaction?.

Explain yo

angwer briefly. (b)In the experiment as shown below, ammonia gas is dried and then paased over metallic oxide X. A colourless liquid Y and a colourless gaa Z are obtained as the producte.

ammonia

porcelain

gas solid X

boat

(i)

ayringe

iquid

⚫ drying

agent

heat

cold.

water

Give the names of the substances Y and Z respectively if X is copper(II) oxide, Give an equation of the reaction.

(ii) Give a chemical

test for the

presence of Y. (ii)Suggest a substance suitable for drying ammonia gae.

(iv) Would there be any

reaction if solid X is

(1)Zinc(II) oxides (2)lead(II)oxide?

If there is NO

reaction, st

state ao. If there is à reaction,neme the product(s) and write an equation of the reaction..

Question 1

In the experiment below:

a mixture of potassium nitrate and concentrated sulphuric is gently heated and a pale-yellow liquid Y is collected in a round-bottomed flask cooled under the water-tap.

water.

tap

brovn

fumes

heat

pale yellow. liquid Y.

(a)Name the apparatus

marked with X. (b)Name the liquid Y. (c)write an equation of

the formation of Y. (d)Name the brown fumea

observed in the apparatus X. Write an equation of its formation.

(e)Why does the liquid

Y collected has a pale-yellow colour?

(f)Suggest a simple way to remove the yellow coloration of liquid

Y.

(g)Why is it not

desirable to heat strongly the mixture in the apparatus X? (h)What is the purpose

of cooling the receiver under the tap water?

(1)Why is it necessary to use an all-glass apparatus in the above experiment?

(j)Describe what would

you observe and.

explain, with the help of balanced equations, in each of the following

cases;-

A few copper turnings is added into liquid ¥. When the reaction→→→ the reaction ceases, mixture is filtered.. The filtrate is then evaporated to dryness

vaporating In an dish and the solid residue is then heated strongly until there is

no further change.

2).A:mixture of sulphur.

powder and liquid Y is heated for some time, with a little of bromine present "as the catalyst. The reaction mixture is then filtered and to

added a few drops of acidified barlum. chloride solution.

|Queation 12

In the experiment ma shown below lead(II) nitrate crystals are heated in a pyrex t

-text- tube, A Liquid X' and' gas Y are obtained.

旅遊介紹 專輪廣告

| lead(II)

for Y

Bitrate

heat

X

freezing mixture

(a)Name the aubstances

X and Y respectively, (b)A solid residue Z ie

left behind in the pyrex-tube at the end of the reaction. What is solid Z?

(c)write an equation of the reaction when

lend(II) nitrate is strongly heated.

(d)Why is it not

desirable to prepare

the liquiX by beating copper(11). nitrate crystals? (e)why in it desirable

to mllect the gug over water7

(f)It is found that

solid Z is only sparingly soluble in dilute sulphuric acid or dilute hydrochloric acid but very soluble in dilute nitric acid. Why is this so?

(g)A few drops af liquid

X is dissolved in

2 cm of distilled water.

iWauld the pH of the

resulting solution be greater or smaller than 7 da ii)What would be formed in the solution? iii)Write an equation

of the reaction on dissolving liquid xin watern, iv)Give.the oxidation number of nitrogen in the substances

mentioned in (ii). (h)what would be formed on dissolving liquid X in some. dilute aodium hydroxide aolution? Give an equation of the reaction.

(i)What would be obtained on heating solid % with pdwdered charcoal, Give an equation of the regation..

of gan Ye

(j)11:560 ci

was obtained in the

measured at s.t.p.

above

experiment,

what is the mass of lead(II) nitrate reacted?

(k)In general, the

nitrates are thermally unstable and will decompose readily on beating. Name the product(s) and give an

equation of the reaction when the following nitrates are separately heated. i)Potassium nitrate

cryatals

ii)Zine(II) nitrate

crystals

iii)Silver nitrate

crystals

iv) Ammonium nitrate

cryatals.

物理(七)

明鴻出版社

MILL & DALE PRESS

'Revision Exercises

for

Cert: Exam. (1988)

PHYSICS (D

2.5 Experimental

men suronents (A) Measuring specific

heat capacity of water:

As shown in the figure, the

the immersion heat is watta and if time taken. to rate the temperature of m kg of water from

temperature-1 to temperature To is t,

then the specific hent capacity of water can be calculated by...

急

me(T2-T1)

or

C

T

Immersion

heater

Jouleme ter

80

Since there is loss of energy to the aurroundings, therefore the value of e olitained will be higher, This can be seen if we let the loss of energy the surroundings be E'. thus

·Pt-Energy supplied by

the heater

=(Energy: gained by

water)+p!

nc (T-T1)+E'

c={}>t~E* }/n(Tq~T1}

Which should be smaller than the previous culculated value of c. (日) Menauring specific

heat capacity of metale

Suppose a jouleme ter is available, we set up the apparatus cs shown in the figure below.

Joulepeter

let_memass

Thas

of

experimental

cup and m'mass of control

water inside

cup and water inaide J-initial joulemeter

reading

Jy-final, joulemeter

reading

for Immersion

heater

-thermo−

meter

metal

block

In order to reduce the energy loss to the surroundings, the block should he wrapped with some cotton wool. Also,

to ensure good thermal contact between the thermometer and the block, a little oil on the thermometer is. necessary.

Let mamas of the

Thus

or

metal block T-initial

temperature

Ty=fiund temperature Joinitial joule meter reading Jyefinal joulemeter

reading

c-specific heat

capacity of the metal

J11TMme (Tq~T1)

Again, there is energy loss to the surroundings, therefore, the value 89 obtained may be higher than the actual value. (C). Measuring apecific

latent heut of fusion of ice.

As shown in the figure below, emall pieces of ice are heated. by means of immersion heater, The maas of melted ice can be found be measuring the musa.of water in the beaker below. A control experiment is set up in exactly the same way in order to estimate the loss in energy to the surroundings.

experimental capparatug

Jouleme ter

L-specific latent

heat of fusion of ice

The major error is mainly due to difficulty in mointaining some energy loss in the experimental and control apparatus. In addition, if joulemeter is not available, the power of

the immersion heater and the time taken for heat- ing should be found.

Hunce the term(Jg-Jy)

should be replaced by Pt. where P is the power of the heater and t is time talken.

(D) Measuring specific latent heat of vaporization of wator As shown in the figure below, a kilowatt hour meter ia employed.

Heater

Let

(Suitable) weighing machine

Kilowatt-hour meter

minitial reading of

the Weighing machine:

m'final reading of the weighing. machine:

PakWh meter calibra- tinon in rev/kWh n=number of revolu-

tions counted in kWh meter Lopecific latent

heat of vaporize- tion of water. ...

thus

Energy supplied" -np kWh

(joules)

3600000np=( m>n!") I

or 1-3600000pp/(n-m')

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