(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
WFISHER飛燕 漫遊城市人的 音樂旅程
TPH845K迷你四波象收錄機
城市人瀟洒出架,追求迨遥自在, 傑得自我表達,對音樂要求嚴格, 飛燕手提收錄機,陪伴城市人榖過 每一個像快的日子,城市人創造 別覷一格的音樂旅程。
FISHER
The first name in high fidelity .
PH045K
※ ASF 自動樱的功能
飛燕银器(香港)有限公司
TU: S-2451 14 (714); 5-2202
REFRENARKAN FOUR318–3194 電話:3-662238+9,
TRAINING FOR A PROFESSIONAL CAREER
Yes there IS a faster, more
reliable way to get yourself
a business qualification
Youare 16ormore and planning atbusiness career. You. knowthat a recognised professional qualification, with some letters after your name, could quickly put you out in front. Buthow long does it take? The answer is that at West London College, you could quality in just one year for the Diploma of the Association of Business Executives {A.B.E.}You could do this evenif you do riot have the "normally required GCE certificates becausethe ABE
realises that experience is just as important as academic 'qualifications.
THEVALUABLE ABE. DIPLOMAINJUST ONE YEAR
What you do need is a sound knowledge of English. ambilion-and just one rewarding year at West London College.)
SOMELETTERS
AFTER YOUR
·Association o Business Executives
Association of Busmass& Administrative:
Computing.. Association of Comshod Accountants Galeong Operations
Institute of Bankers Institute of Adronushtative Management Institutect
Marketing
GCE&ASA
It we accept you as a student, your stay
in this great capital city could sel you up forlife.
PROSPECTUS ON REQUEST.
West London College is a specialist professionaltraining organisation catering for students of both sexes from all parts of the world. We arrange accommodation at hostels or with selected English familles and attend to documentation,travel, artlry to UK. elc Students enjoy the many cultural activities in London under the experienced supervision of our Welfare Department
If you would like to know how you could quality in one year for a recognised Diploma, we invite you to apply for the Collegeprospectus. Please indicate
yourage and subject(s) of interest.
WEST LONDON COLLEGE
WLC
DEPT. 870 AVON HOUSE,
360-366 OXFORD STREET, LONDON W.1., ENGLAND.
SPECIALIST TRAINING FOR PROFESSIONAL CAREERS
走方