(19)育教 閒港 日三廿月八年未辛曆夏
經馬日三
H
白禮林·四九
HRE 111:
二大四
..
一期星日十三月九(一九九一)年十八國民華中
活復私走上海港中
艇快細較力馬用改
截堵難員人安公船漁用利或間
一用比較小型的快艇,取代俗稱、子業務總監, 的中港海上走私活動近期有轉 公安部追捕,採用訴策略• 中、港、台電 趨 活躍跡象,而走私客攜避開 (特訊)沉寂了一段時期
電子業務。 一月偉治先生(Donild F. Barrett) 獲委任 ,任兩要員,主理讚公司在香港、中國及台灣之 [港)杜邦亞洲-萍有限公司宣布委
前實施靳境例,規定快艇馬 城鎮,都是快艇走私活躍地
艇走私,轉焉採用小型快
地帶
展發務業太亞合配
員要兩委子電邦杜
要會電加在燃
的港避總任一個公五系大中 項推任
是世界尔伤心
多元化的化工
力大,至六十匹,是帽出致
大嶼山北部供水 敷水管工程招標
人員难以一一扯樓- 據當地至公安
九龍城汚水渠網絡
刊登嫔上貼出版的
·投標表格及其他資
一十五個月完成,情已
通道以及石門中音低浦之間的輸水管教設工 該台約是大嶼山國其中一沉臨時世
一千六百五十毫米的現 進行工程,將一段直徑二年一月施工,需時約 正準。
招標進行改善工程 ·敦道四〇五,合作包馬牧股長的千米的冰響,直徑由
上龍政府合署- 四樓 二百至四百毫米不等;..
一正計劃在九龍城世運道一名,而所有上市,工程預計十二月展開,爲期七個月,此
|排出的淤泥工程,
•艾招標承接處理及排去出沙田通术费
管,兩個沙井,以及在遠木廠內建水钻室。 工 ...工程包括設直徑六百釐米的球墨鑄鐵木
有污水渠改道,以改輕氣體及微粒監測系統
九龍城區香進國際機場
外圍的排太逼矯格。 機電署現正招標安裝
報日僑華
道污水渠和四個特別沙 工程將興建一條改
那一步,這條改道的污水渠署及设爲葵涌一部「一般工程」 | 負責標日期是十月十一日正午s.
機電工程署的市子 道七號政府綜合大樓第二座四 四樓索取 - 戴 登,投票安格及其他資料可向香港灣仔告士打
·水務署叉計劃在大觉和本质与
徑一千六百五十亳米構體及微粒連續監棚系 裝工程。 包括一段長四十米,直焚化墟與供應及安氣設計上態系統的監督安.
投概樾格及其他瓷 基應插入花崗岩內。 大水塔,工程會深人水底三十米,
水務署
內場動運灣鑼銅
放開停暫場球網
關現
建的豐管污水退,以及化、一氧化碳、 六百五十毫米的浅水 以記錄、輛選、提取及 為三十五米,嘉隆一千量的湖上儀器,以及用十五日正午十一日正午前遞交。 在世運道再敷設另一段度、抽風機及温度等參 辰,截標日期爲十月二工程顧問有限公司索取,填妥的文件須於十月
↑分析數據的設備。
·網網 灣運動場內的十個網球場,將 由星期二十月一日)起,背 : 〔港:市政局轄下铜
他令人孽節詩賞的項目。..
·場分兩期封閉,以盡珽减少對 舞、匈牙利徙【克僻、沙安堂舞舞、帕洛茲風笛音樂,匈牙利民教及其 上手,停開放三個月,以便進行保谤 (港)在藝術總監兼編韋山度,我馬領導下,匈牙利國家民族歌 場內的八進網球場及兩個練習的特衫演出。演出節目將包括紅子紙、許基德、桃園舞、雙人源、牧人
·娜團將於十月八至十日(星期二至四一晚上七時半在香港文化中心大劇 是次在香港之演出,香港觀眾將可欣賞到彛盛其中約四十多名成員
匈牙利國家民族歌舞團
下月初在文化中心獻技
在起用 日說;院演出三场精彩民族歌舞。
十月一日至十一月十五日暫停 文化瑰寶。
·開放;而三、四、五、六號
六日至十二月三十一
,是在保存匈牙利人民炎居地的
利亞公園網球場、香港網球中心及寶尖道絣球各地西迎。 受影響的場地。此外,他們也可使用區內維多一樂段,他们的足迹粱及四大洲,分在四十二個國家巡起演出,深受世界 越封閉期間,愛守網選的人士仍可使用其他不四名舞蹈與外,還有一堂由二十人組成的吉卜賽樂利一支五大民族 而損毀的地面,以及所作場地上的界線。」,歌舞團演出的作品繁博豐富,民族舞蹈莒莘了何牙利感统文化的特 ,她補-
說:「诉鑼灣運動場內的網球場分華,音樂方面,則無收悅耳動聽的古典名曲,歌舞班人才濟脊,除了有
「山海道及級的賽旨在百青年人魂 敬。:
吳火說:「上的風作到家,再經常演奏他們的雌
延至明年初- 求群,原定於八至十月間舉行之一,并须身對力行完成泉,祂寫報告爲何艾利國家良族歌舞團的藝術總監三狄馬名 (渺訊!由香港青年旅舍協會,先設計一條長短適中的遠足路錢,接向感好在八兩年獲委任
·員、歌手和樂手。 倒鑼灣運動場內所有網球場將於┃九九二 全國數以百計攢堂入團之演藝人林中,選拔結英,加人緣歌舞團為難
·書·萨利評選''''''面世爾,世界各地熱變民族舞的人土無不心儀
'''''亞斯娜牙利國家民族教师媽的藝驚總監,由座,狄馬職員之一是 在國內外的大小比
腓分别骛明年一月十五日下午五時,護足旅行之能力及興趣,增加社會,狄馬會在幾度及龍將藝術學院深造,為他
·更會在該險 一龍園、葆、蹈及編陸方面,更因其华越成就,而贏得愛牌
·大士行旅舍很舞事業奠下良好基礎。到了今日,他的編號 及大铈然之造詣烛火纯卢,在匈牙利冼稱全國之冠,在煙
匈牙利的民風習俗,钋别是音乐,一方面保留古老的東方色彩,另 及兩個練習場則將由小 | 月 | 方面揉合純歐陸風情,形成了獨特的藝術風格。巴托克和科这里這兩 二位作曲家的作品,正是其中的裘裘者;而匈牙利國家民族歌舞團的吉卜
及二月十五
一日正午,青年旅舍協會主辦
伊達 遠足路綫設計比賽
·協會對表
人表示,由
於現時天穎
加上查詢的開議任之人士非常 懾熱,秋冬的氣候會更適質遠足,, 解,故該會決定將比作延遲舉行,對沈丽石殃星十些坐
向香千張以上,則可獲八折優惠, 有意赉消除連報名,附回郵信、九北優惠;而滿
·截止日期延至明年初 祖海道海報、一百八十、一些千及六十元四種,另後
指南中刊出 學生及高齡人士半價優惠,現已在各威龙
下午十二時半在澳洲墨爾本市的費明頓馬場星期則由上午十時三十分起接受投性。 受對該賽的投注。 " ' . 時爲止。而鄰近遊客酒店區的投注處在十 二時三十分開
本月的第
1991中學會考試題建議答案
明德出版社
MILL & DALE PRESS
Chemistry
SUGGESTED SOLUTION TO CHEMISTRY
Note: Key words have been BOLD type.
Question 1 (a) (1)
(1) The halogens.
{2}{1} b. and- f have the same numbe
outermost shell,
(II)b and f have different numbers
1.000
$0:24 per.g of ethanoic acid
(vi) Brand A: $31250 x 50)g.
500元
Brand B:$60
6+ (0.5 X 0.992
x 0.992 x (12 x 2)
*+ (fodax:0.992
60)
$0.20 per g of ethanoic acid
Brand B. 15 a better buy,
(b) (i) Thermoplastics serbert on heating.
ther
hot where Tastics
yrene.
a better insulation of hed "conductor of heat,
(iii)(1) Polythene
TGH. CH2
(2) Calendering on extrusion moulding.
trons in the (c) (1) Tin metal.
trom shells.
(ii) Both c and d are metals. d has a stronger heallic bond
(than c, so, it has a higher melting point::
(111) (1) A)203 (20g)
(2)
APPLICA}0 separately; into a dilute strong acide.g.
24
and a strong alkali, e.g NaOH, Tt.will:dissolve
in both of them.
(iv) (1) Afrotropes of an element are
the some physical state.
{2} a(carbon) and e (sulphur)
(1) aey (CS)
fferent forms in
MONG
(11) Tin(11) compounds because 1 mole of Sn
adaptor often
made of
gases are
needs only moles of electrons,ive 2 faradays of electricity, only (iii) This is to prevent the rusting of iron.
Question 3 (a) (1)
When a scratch is made, iron, being more reactive that ting changes to iron(II) ions quickly and hence becomes rusted. Thus, it is not used to make food cans..
It is because petroleum marine organismsv
The different components boiling points.
formed from pre-historic "dead
petroleum have different
(11) Mass of
(1)
iron powder
26.16 - 25/27
20.89 g
Mass of oxygen combined with iron.
26.50 26.16-
0.34 9
vigle ratio of Fel
0.890.34
56.0
15.0.
= 0.01589 0.02125
117103445
34
empirical formula of the oxide of iron is
(1) Graphite.
(2) Zinc
(ii) Manganese(IV) oxide
(iii) (1) Zinc metal is oxidized to zinc ions (znt) as the ceil
is operating":
sznts) -
Zin* (aq) + 2e
sg, the metal case becomes: thinner and ledkage, wiit..
unally occurs
Wind MaOH(aq) to the teaked solution and warm stightly.
pf the gas evolved turismoisted red litmus blue, ammoniura ion (NH, is.present.
+OH (ag) - ► NHj{g} + H2O{f}
then
Add acidified silver nitrate solution to the leaked
seen lution. If a white precipitate hloride tons(C1)is present.
AgCl (5)
(aq) + C)^(aq):
carbonate ions (C03") q(aq) + CD3 (aq).
* Ag-C0g(s) + 2HNO (aq)
2AgNO, (aq)
CO2(g) + H2afe)
De sulphate ions(507)
white
及下冠豪的表現,備受讚賞,鷄壁明策及時力,何敬森就是符合了王建的因素呢。 新人的表現類符裡想,昨實有錢建明以,之神亦見眷顧,而事實上天才就是不断的努 均有不凡的進展- 除了本身努力之外,幸運
(b)(1),
[N]
[Na]
(2) Coe has a higher melting point because it is an
(iii) (1) Heavy oil
(2) Thermal cracking can be applied..
(iv) (1) (1) Propene
(II)Propane
{2} (1) CHąCH_CHg + 50_
KO
CONG
compound and its ions are strongly attracted to another by electrostatic force.
ae, is a covalent compound and its molecules are held together by weak intermolecular force or Van der Waals force.
(11) H250, is a catalyst.
(111) Saponification
(iv) y:RGOD Wa
(v) Sodium hydroxide reacts with the acid RCOOH to form the
I to for Salt RC00 Na and H2O, thus shifting the equilibrium to the right and increase the yield of propane-1,2,3-triol. (vi) Y forms RC00 ions on dissolving in water. RCOD has a hydrocarbon portion and an ionic end. The hydrocarbon portion cai.dissolve in peanutofi while the fonic end.càn dissolve in water. After stirring, the oil drop is broken down into droplets due to the repulsion among the negatively-changed ionic ends. The droplets cannot slicr together again and a milky salution is obtained.
jonic acid
•300g + AH2O
(11)Propene burns with a more sooty flame becaus
( has a higher carbon content.
(3) Pass propane gas over some hot dry copper(T1)xida If the gaseous product turn limewater milty, then co
is formed and hence carbon we present in propane, Ir the colourless qdorned turvacnbalt(11) chloride: paper, from blue the peak, then water is formed and hence: hydrogen is present in propane...
(4): Pass propene and propane separately into some bromine.
sclution in tetrachloromethane.
Propene will at once decolourize the bromine solution. while propane will not.
(b) (1)' ' Contact process.
((11)
(1) Vanadium(V) oxide of platinum,
(II)This 19 due to the gradual poisoning of the catalyst
by the impurities.dual poisoning
The catalytic effect could be prolonged by purifying. the gases before passing them into the reactor..
(iii) Two advantages):
(1) It will not form misty acid fumes on dissolving in
conc H250g and Tess heat will be produced. (11)H-30g with higher concentration can be obtained.
(iv) Mass of H_SOg in 1 dm) of acid
= 1.84 x 1000 x 98%
* 1803.2g
Mof H2SO4=98
Concentration of conc. H2SO4
1803.2
98
18.4 M.
Add acidified barium, chloride solution to D. -precipitate of barium sulphate is seen.
Ba2+(aq) + $0 f*(aq) ► BaSO, ('s)
(iii) Pass chlorine' gas (Cl) separately into solution A.and
question 5 (a)(i)
solution. B
A will become orange because
\\£12(g) + 2Br (aq)
the formation of bromine..
Br(aq) + 2017(aq)
will become brom due to the formation of iodine.
C}2(9) + 21 ̄(aq)
一> T(aq) + 2C1"(aq)
Hydrogen gas (Hz):
It is because the slope of amount-time curve of
steeper.
fií) (1) Equilibrium is reached at 20 minutes after the start
ef reaction.
It is because there is no further change:
•amounts of both N2 and H2
(2) Add:a, suitable catalyst.
the
The catalyst will speed up reaction but not affect the
equilibrfum position,
(iii) (1) n(N } consumed = 0.1 mol.
{2}n(Hz) consumed = 0.3 no1: (3)(NH;}" formed
n(N) consumed
-2x 0:1
(iv) Yes.
hydrocarbon
partion:
(vii) Emulsification,
Ycan: be used for cleaning.
(a) (1).
Question 21.
III. Shake the mixture
ensure homogeneous mixing..
Using a pipette transfer 25,00 cm of the vinegar into a 250 cmé volumetric flask.
1. Add distilled water to the volumetric flask to the
mark
tool
(ii) Phenolphthalein well to
It changes from colourless to pink.
(i) The readings in the first titration is discarded because
the first titration is usually a triol and the readings
are not accurate,
Average volume of a used
x (25.70 1.00) + (26.20
.30).
1 × (24.70 + 24.90 + 24,80)
24.80 cm
{iv} CigCOOH + NaOH – CHCOONa + F20
(v)
1103
Note that the original ethanric acid has been diluted 10 times.
Conceitration of ethanoic acid in Brand B.
24.80
ㄓ
1000
x. 0.10 x 2500 × 10
1000
0.992 01 din
Let x cm3 of conc. H250 is required,
1000
* 18.4 500 18.7 X:0.1
0.1
2.72 cm3
(v)
2N03
(vi)
Question 4
2NO
delivery tube
-test-tube
conc. HNO3.
The brown gas NO is personous, so, it is carted oat' 18 the fume cupboard.
(a) (i) Pass hydrogen gas over heated rusty iron powder.
#2 + 3H2FC + 311,0
(ii) Twd reasons are:
(1) To allow fresh air to come into the crucible,. (11)To prevent the content from escaping.
0.2 mol
The dissolving of NH in water will shift the equilibrium
position to the right, thus increasing the yield of
Haber process.
(2) to make tertilizers or nitric acid.
(b) (4) G's HS (as ohtained by balancing the equation},
(11) H250, is an oxidising agent.
(iii) Reactfon similar to equation {1} occurs but that of
equation (2) will not.
It is because HC1 is a weaker reducing agent than III, cit is not readily oxidized. by conc. H2504和
|_{1v) - (1) 1, is formed at electrode Y.
(2) X Some colourless gas bubbles are seen.
2*(aq) + 28Hgt
Y: Brown solution is formed around it.
2tfaq)
+ Ze
2.54
= 0.01 mon
{v} (12) formed - 254
21 (80) --
Quantity of electricity required - 2 x 0,01 - 0.02
1 mol 0.01 mot
3F
·0,02x·96500.
Lise required a
0.5
-3860 S
1 hr 4 win 20 s
諜早以所