1984-04-05 — Page 7

(iv) This is because,

on exposing Lo

日五月四年四八九一膳公年三十七國民華中

育教濟經頁三第張二第日五初月三年子甲曆夏 WAH KIU YAT PO

報日僑華

四期星

=0.0037 mol

1984

n(Naol) reacted

Solution (a)

042

中學會考試題預習專欄

x

+201

化

學

(廿八)

明德出版社未宏林提供資料

"CHEMISTRY (28)

REGINALD W. CHU

MILL & DALE PRESS LTD,

Solution to 40

(a)

(1) (1) X is iron(11)

chloride,

(2)' HCY+Fe

FeCln(s)+Ho

(1) Liquid y' is

water:

Moisten a pi

cobalt(11) chloride Y paper, with. Y which would.

turu from blue

to pinkifY js water.

(5)Hy+Cn)→Cu+!!!

later is to

dissolve the

unreacted hydrogen

chloride gas.

Concentrated.

sulphuric acid is

to dry the

outcoming gas.

(iv)(1)Yes, zinc(TT)

chloride is formed..

(2) No copper is

below hydrogen in the Activity Series, and

hence would not displace.

hydrogen from:

hydrogen chloride,

•(1) n(101)

35

1000

15 3.000

=0.005 müf

on mixing, (NaCl)

formed ·

(Mall) reacted

≥0.005 mol

volume of solution

X is 50 cm

molarity of NaCl.n

solution X

0.005.

50 =0.06:

x 1000

(Li) n(c]). In

solution X

X_N(IIC))

originally present

= x 0.0035 =0.00175 mol

According to the equation bel

Ag +61 ( s ); mol Im

N(AgNO,) required

-R(Ag*) reacted

=n(C1) in 25

solution X

00175: mol

Let the volume AgNO, required be

Y cm Then

1000

<0.05–0.00175

(111) N(A°C]).

prepcipitated -n(ct) in 25

of golution. 0.0175 mol:

† (AgC1)=108+35.3

=143.3g mol

mass of AgCI precipitated

-143.5 x 0.001751

-0.2310 g

sunlight. for some while, silver

chloride, decomposes

to give me fallic. silver, thus imparting a grey colour to the precipitatë,

Solution to q.41

Ammonia solitien. contains ammoni um jons (Ni)

hydroxide Lons and the molecular ammonia

2. hydroxide.

Non contains:

sodium ions (Na+)

and (015).

(fi)Bqdroxide inns.

are considered

as alkalis because They hoti contain the hydroxide ions (on),

Precipitates are

formed. In white preci; tute of Jead(II):

hydroxide is seen. In By white: precipitate of calcium hydroxide is seen.

In C, white gelatinous. precipitate of zine(11)

hydroxide is see In D light blue precipitate of -copper(11)

hydroxide is seen

f E, white

gelatinous

precipitate of aluminium {1}}}] hydroxide is seer

They are

Tespectively:

Pb+201

Ca

Pb(0),(8)

+201

Ca(UIF),,(s)

Cu(OH), (3)

+500 A1(01),(s)

la the test-Lubes A, Band E nothing.

is observed and the precipitate

previously formed remains.

In C, the precipit- ate dissolves in excess armonía solution to form a soluble complex iou

zn( (II),+4NI¬

→→ 70(NH3) 4

+2011

In the precipi ate dissolves in excess ammonia. solution to formi a soluble complex ion of copper.

Cu(NIL;)},

Nothing is observed in tubes B and D, and the precipitate previously: formed remains: However. the precipitate.

previously formed;in A, C aut E

respectively: dissolves in excess sodium hydroxide solution to form a soluble complex thus giving clear solution.

a++Pb(OH)

2Na

Zn(OH)2

* + Zn (01),

X is an ester

Criester).

(ii) (1) It is known as

alkaline

(b)

hydrolysis.

No, as it is an fonic compound with the Tons. being held strongly together.

(3) ft:can be used

as a detergents for cleaning

(1) Cone Sy

non-volatile, thus being able to displace the more volatile nitric acid from the metal· nitrates.

+IINO=

•NaltSoy +

However,cone HC 1

nd

fumes strongly has a low boiling point, so, it does not displace INOg

from the nitr

(ii) On dissolvingin

watery chlorine gives hydrochloric; acid,

and

hypochl onous acid (HC10), which is a responsible for the bleaching action. Dowever, it is unstable and readily decomposed by light, thus losing its bleaching power.

2FIC10-11ght> 2HC1+02

(ii) Yellow phosphorus

is very reactive.

and bursts into flame spontaneously on coming in contact with air.

So, it is

stored

under water. Sodium

is also very

reactive readily

oxidized by ai

as, it is stored

ander berosene as

it reacts violently. with water too

Ammonia gas. readily 'scapes, from its concentrated solution. If the bottle is not lightly stoppered, it would escape into the Laboratory, thus causing danger because it has a pungent, unpleasant smell 'and is. inisonous in nature.

(v) The white firm is

calcium carbonate, which, being insoluble in water cannot be washed away with.water. The. film is formed by action of M atomospheric carbon dioxide on the limewater,

· Ca(011),+CO2

CaCuz (s)+1!y 0

(c) M(Fe)=56 g mol

M(Fe„Uz )=56" Bol

According to the equation below.

+3C02Fe+5COg

1 mol e. 160

2001 (2x56)g

360

required

mass of haematite 100 =800 x

· 64

1250 kg

由多國票據貼現公司組成

並訪問廠家作深入了解

國際貼現連合組織 五月來港開研討會

|英嶐迷你電腦系統及外

COLEG

至於SYSTEM

遼寧亠 礦儲瑨逾億噸 四川發現大銀礦

·國配件主要供應商,而一頓麥示:「SYSTJAE產品在本港發展,雷

CO L則是SYST←-ME在英國電腦工業佔一氏表示,過去此間用戶

探

但用·示品

訊)日本產型銀碼。

· 本廠家豐田

、這個銀礦位於材致 TIME」電腦

「東京,發現一個規模可觀的大 今年頭三個月,已售出 E迷你電瓶均採用DC 訊工業,而SYST! 繼續加,而又倒格乘宜 C北京图) 四川省 | COOL LTC·夏希其所出售SYSTIM数年開始發展電腦及資 主,但目前已有愈來愈 達四百萬港元「SMS C處理器,英國製造的ME在英會起,更爲英的代替產品,而SYS. 起一股熱潮。」 接口,控制器及外圆配一蓬勃發展的電腦工業掀 TIME正符合此一 ME產品在本港代理,領導地位,英國處僅於,以採用美製電腦設備旍

品而始前製 淨本

找來備 用

汽車會社商

州白玉縣境內的東山地

SYSTEME爲一件。

THE

透躭體,在共生的鉛 百分之五至七:品 盡。娠的品位高位遠到

底價權 帶中,说勘察到二十米 生·資的帱車工」厚的獨立鎮碗體。...

善導會學生徵文比賽

在周一地區同時還

庄 自今年十二二一發現一個大型多金屬

1十開生度計起

職| 製合用通田豐

,此二 二始连八一劃 之明

全靠末月虚,五一產生底年車轎

使要 計五‧用 九一

八九止產自 廠對公園,級汽車司

四八雙。今預的司通盟主

可,年年五方年定 店 合用 田

一張,主要還有銅、

一定幫助 瞭解粟淼貼現的功能有甘限額。 初在本港召開週年會員 會員協助,經他們接

「港 一個由多一總部設在荷蘭阿姆斯特 國票據貼現公司組成的丹,會員要查的某地智, 大會,預料對本地廠商後,建議一個貼現的倍,示計劃自一九八五車型鉛的品位達到百分之一 中國際性機構,將於五月 家的資料,可透過當地一月上分爲止变方均一沿、銀等,其中銅、 利用票據貼現來作一始生產,並自今年春季一型多金洲礦與三江地區 稱,這一大型銀礦、大 據地質界有關人士一宗

•該國際組織 FC

盛融通方式的觀念,在

【一 FACTORS...

DCHATN INT e]M讲一直不如做英般流一切」, 已評價過的多金屬藥組 行,現時有關方面正透一二千五百人成了四川西部一個重晏

「,爲數百多人的代表團 RNATIONAL)|過不同的途徑,藉以外

一將於五月七日來港,有一绍及宣傳票據貼現的那一面再活过得樣處一直長大。

薔蘺養源基地,開探價

獎資題

華善

僑導

助

宮:爲探討青少年對物質生活需求的見解,從而培養他們在此方

:上犯罪之途。 面有一正確的價值觀,好使他們免受無止境之物質引誘而走

目:論物質奢求對青少年犯罪之影响 格:凡就讀各中學的中國心中五學生均可參加

亞軍一名

獎學金港幣一千元 優異獎五名 各獲紀念品一份

·季軍一名 獎學金港幣三百元. 獎學金港幣五百元

解。 ... ... ...,始培加,而提供貼現股市場中已是老化,通用一 們對本港經濟環篩的瞭,市場對貼現的認識開|,兩種最小型的車種在|家滑蘊藏着一個品位校 商家的活動,以增加也不多,但由於經濟好轉,現在的通用產品系列中,於遼西走廊的錦西縣附 辦一連串研究會及訪問|現的業務大致與去年年|一千六百CC小型車「質勘探部門經過一年多 VX-上沛之故。在一的說探,現在已探明位 召開週年大會外,幷整··務。范海珠表示今年貼 希望儘早使共同生產的“八洛陽電 遼寧地獎勵辦法:冠軍一名

據後,再往日本訪問,蚱 咳比去年理想。: _ 代表團將由法蘭克·務的公司亦多了一些希望TVX能夠在一九一商的大型鉬鋼床。 一鸛出發,結束在港活動,間,今年的貼現業務驟一市場中推出,以便取代儲量可達億噸以上,有一 一八五車型年度中健块在擴事家估算,此

上述兩種車型。”

一個行程為期十二天,代

一里,分貫上、中、下 |磷地帶約七點五平方公

我国在本港的活動程序 新鴻基銀行發行

家溝和元賚山四個分區,

。此礦區距中國鉬菜基

流貼現業務的意見,而 港舉行的活動,互相交 FCI代表團透過在香 -據貼現的范麗珠表示,

一策劃的工作。

·新鸿基銀行負責

由新鴻基銀行協助部份

心舉行。

馬尼拉時裝展覽會

【玼海外買家經常訪港

神的場地。

產生國業工

長增大年去

的相同。

-基金會指出,這

告上升.

三分百幅增均平

千五

元萬

黃露 動浮

率利

證存

幾公里,開採條件良好

。緻舂新礦區的開發已

·打入港市梅

本港習膠公司——1

̇發規

、 善導會主席余錫光會計師

善導會會長楊鐵樑按察司

微文評判:担任是次徵文比賽的評判包括: ............... 另各入選作品均可獲紀念獎牌一面

·中文大學中文系講師何文博士

途之權利,所有參賽作品概不發還。 三七七張惠君小資洽。本會將酸别去函通知各獲獎者。」

格:字數不能少於一千五百字,以原稿紙直行書寫 參加辦法: 參賽者只需接參陡作品附上姓名,年齡,性別,身份證號碼,地址,電話,就

·比賽結果一切皆以評判之判决爲準,不得異議。本會將保留得獎作品作任何用 育組收。截止日期爲四月十五日。如有任何查詢請於辦公時開電三——五三三 讀學校及級別等資料一併寄回九龍東頭邨第九座十至卅六號地下善導會社區敦

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