·期星 日四十月二十年三七九一公年二十六國民華中 展工育教
文不起無的潮館必日案此遊入,
品事情本似的 天樓 略否要加本制 儘多,期 將遊街昨過於日1
以工說工 有阿罪,識
管。本,中更客 天機 當起迄期
·打成對會 奧使今能 開果內鮮
市是港的 爲向人員
鼻
威介紹正 本稻本如
肉
六学米
居日共多短明星。是今天
假假
續大
̇遥都大夕 來港 翠臨如
老風大
溫馨極
廿日
又潮
位二通 售 。港淋究织
,碼
逢湧
∵七家展區,面最位外之批至頭展供人故
『按家,世。其很爽,,多場佈感及本會用一力每
密他望出介业内。
園長地說。
預
地行 爲然:
水四能關 本市 惜之
均
請
三游 中時 陳國家樂具。局安溪:客巔
場
大會展出進入第三週
入場遊客逾六十萬
·
外的追进
的工毎重
家家者:
列綜
品品製器外陳位品
十樂列位,品辰由民全年位往並下 家家一一瞥琴:格本管展方: 星案仔
攜霋向佐氏夫婦介紹照。
∴ 工商處長佐敦夫婦,昨在淘大光事長黃寫
黃篤修介紹糖薑製法
由於工展會無固定場址,計在港島舉行者- 会 毌報局,改局等。《國坤》 喪術館-七家,政府及社會機構有市政事務署 禁毒常務委員會;香港家庭計指導台,公民協 此防盜器包括兩主 爲使用證九V電池。
·家,豎品菜二家,雄行業十四家,榮品業十一家際的伊產製造過程。陪同參繇的尚有莊重
穎新手袋防盜電鈴
出品比賽及新產品獎一本月廿八日下年四時在|無七元博士主持。 榮獲工展會新產品比賽優異獎 第卅一届工錢會計比賽頒獎典禮,定于一份禮台舉行,由 員一夾,夾於手袋內隔,金 穎新公司乎安防
|*向外一開口部份
邁接,放置時,將金屬
「要部份,主機及開關, 兩者由一條雙蕊隔離線
「箱-全部裝於.10.9 x 致業部份提案,及池 J,把子觸發器,警號 括一光餓感應器八眼 防盜器主部份包 後觸鼓警號部份而發出,在開犁旁有一孔 開開故密碼不能關閉 一,爲押頭所用,當插頭」 之。 光電感應器檢得經放大 密碼才開閉本機的功能 事主,此插頭開關是樂 化,光線的變化,給本機的密碼而社有此 1 從而不會那麼容易傷害 乎袋內必引起光線的變 二號,其中一個是路才開始發覺有香號1 當于会被抓手開啓時, 腿,開關製程上有是搶跑候事主致 | 2.2 x32 BAR 10,5" 1.1×16" & MELKTURKS 重爲香港新產品僅氣變手防盜鈴。 .
者的
本展,播旋
糖 昨
魚
領前及
·遺眼站 失
梁發。
奥氏送瞉播音家向爆内游客廣播,希失主前往
大會公安部職員
銀包一個,旋卽帶利公安部,向部長 【報
·“工展公安部戰員何銘基,於前日在會攜拾獲
何銘基路不拾遗
四時在工展會證台舉行頒獎。 ·
五百元交還失主
報日僑嘩
大智障 筆超凡
賽比文徵
精金名
冷定評宿名界帳港由
潤有
光斷線工
七路
和李元金設作展工衝
六徵優百字 日交異五盤 歡 下比獎士、以 午彍摸元導不只
李列特展工
有兩-- 香港工業與香港經 工展會中學生徵文比变[
e中文、英文學校中學生均可參 收件期間,本月廿七日止赦,本
·做女比賽,今正在工浸會宣傳部 : 第一屆工展會舉辦中學生
帶上。金屬一 ,將開關部份放於手挽
應於旁邊的挥孔內
紆棅輯選剳川,華僑改毂總楯輯 炒陽百川“天天日報總劇場使內,簡單方便,其動力 工商日報社長潘仁马:屋岛陶報 及按裝,用家可在一兩,使防盜器處於戒備狀源 |分鐘內裝於便用的手袋一。.. 工展會敦請本港文學名宿, 或抢匪而用,無需接線|碼旋扭轉離密碼,便可
|器榮獲優異獎詿防盜器 其設計爲耳門對付扒手 腰帶上,現在餓需將
·全固恤化风于防盜器』,另一端導於手腕上威 爲超小型高度可靠性的
光等四位担任評判。
WAH KIU YAT PO
頁二第張四第6日一初月二十年丑癸歷复
對氏希現 公跟
...徊於職該:安
包
往到路:麵包安镇
電子密碼開關裝於一拔出時,本機在五
再度旺丁會場人如潮湧
禮會
午二時過後,舟車往客 人早在意料之中,下羸全部告钸。 清爽之昨日,工辰辦事,在二時至四時之間,堪「老人一先行被拾好後
此明婚 斷派出雙肝車輛行走,
·花如 頭特別班巴士,直不 搬到小姐」。 大旺場 筲箕灣赧站,開出灣仔 與宣傳部就首先出現「 再一次博中綠巴士公司,已由物,昨天展打击辦事處 ̇不斷如潮。早已說過本一夜狂老人於今日大派雅 本級雙務小姐交
聖老派禮小姐先作裝備
「凡某一包班』「人」
[之大紅包袱入倉保存,
: 「品包裝入,並以如
公爲準倬四位工胺,机誔肢,背负裝滿禮物
大會慶祝聖誕佳節
今天分日夜塲舉行
「小姐」經過之人士。
決選禮物之多,今天
|菑誕先生又是不同風味
,使有會甘靚此
1比娶语淅时之内,
日對于該節目將于以盛大慶祝,準與萬千計遊客同樂。 峦蹊畤將于明Č卄五 J 日蒞囉,今(廿四)天含酸乳前夕i工展會今你不遊工腰就笑。 聖誕老人派糖·工展聖誕之夜另具服感,同時艾足意
工展會大門環西立兩幅巨型醇美老人的整,笑臉迎人,遊客甚與發隠
老人油江爲伴,拍照留念。
吉
額頭列...你味
「工展會遊記之兗意,均可獲開兩包,迄至完爲止。 脏歌,培蕸聯愛會副主席劉梅新長老致謝同,李武凡夜祝福。石之上,可拍夜码工 「俄節目精彩,計有(一)德明中學鋲樂,大光學校跟榮除演变,由李先將榮香紙杯捕人也內, 先生指揮。(二) 偌于舞,由道派某天感健身院演出,由該院院長天 使人過失望,或水一番 工展「聖之夜」大拜成後旋即舉行遊藝大會,由香玉减小姐可加一個乛鑽石會] ; 會頒貤錦旗,培強度會來乃榮歌頌,李洪德牧師,會對牧師和區,持大門左方,樣微整形就 經,廠商會會長莊金文博士致詞,工展會宜傳部副部長陳道燃向培道愛 鑽石造型位更在背面 「聯合主譙「工候朝閧之夜」,由施應元狄士主持,狹序如下,明中實及已所獲得之名次加格 斯 大光鹨校銀楽像演安序柴 - 施意元敦士祈籍,東美牧師,對道新中校檔當眼處之外,冠軍之 [ 袍自报之盈老人 在會議楂台及大門樓,向兒搖派發酸底倍,屈時前往,各獲獎顯位主人死 不 今晚七時卅分,申選廠商聯合會與基督教培道聯愛會,于工展會股合 究之機會,除紛紛將自 公安部對世仁,門學部長李琳明,宣傳部副部長陳道燐等四位,將扮紅作意及時日之保 留 今日爲聖誔前夕,下午三時卅分,工展會執行委員會副主席梁乃榮, 頒獎之後,這一份乐基 欲逹侶储過就地欣賞
致施,
救
他領導,今挽国時前往工過言遊闖者,當可欣賞此敦及娛樂遊畴前身。
詩愛體及台
留謈及陳
1974中學會考試題預習專欄 堅道書院主編
化學科(課程乙)t)王兆交
Surrenter
fer last week:
1. Acids have a sour thate and die
aolve many substances, notably
·carHonaten and many electronantt- ive metals with the evolution inf carbon dioxide and hydragen. resnectively. They chonge the colour of Indicators like Jitmus. in this case from blue to red.
Acidu may be retarded aa nroton donors or substances. which nroduce :hydrogen ions, although these are in fact always hydrated and should be called hydroxun fons, H3C ater, as a solve, often actually reacts th the. original chvalent acid to for these lors.
Bases may.In some important. recvects be Tooked upon as appcw site in properties to acids. Hence they change the colour of Hndicators in a contrary wayy litmus or instance, changing from red to blue. Als bases added in envivalent quantities to acids. pare said to neutralize them,
since,the, characteristic acid reactions no longer are given by the resulting solution.
Banda gire rise to hydroxide ions and so during neutralization the fundamental reaction is:
OF $30
OH←→ ZH_C qverall reaction is formulated
Acid
Bise
Salt
Pater
HC1 Certain substances, however, rive neutralization-type reactions although they canthin no hydroge Forhide ions. Thus:
Basic Acidio
oxide | oxide
Caso
Salt
Other substances can react either as acid or base according to
ct rcumstance, and these are cal2- ed annhoteric.
Zn (OH) + 2HC1-
Bane
Acid
Salt
Zn (H)
·Dilute sulphuro an
dilute hydrochlor
resemblee,
2. 4 salt is larved when the hydro-
wén of an add as rent aced:hyin metal. When the acid, containe more than one renlaceable atom. of hydrogen per molecule, 'ther the hydrogen may be partly re placed by a metal and an acid salt is, formed.
(1) Neutralization: This is a
reaction between an acid and abase
HCl + NaOH-NaCl ¥ 820
(11) Displacement. This is normal.
ly used for metals above. hydrogen. In the electrochen mical series..
Zn + 9.50 2n50 +
(iii) Direct combination: Salts
which contain only two elements can sometimes he rrenared directly from the Telements concerned. 2Na C12NaC1
(iv) Double decomposition:
26.1
= 0.7
Insoluble salts are best. prengned by a double dacombo. sition reaction between i solutions of two soluble salts Ar between a solution of a sal hle salt and an affid.
Divide by smallest
2
The empirical formula
The study of cases(1)
Boyle's Law:
given temperature the volume of
a riven mase of "as is inversely. pronortional to the pressure: That Is
constant
constant
its temperature on the absolute.
scale.
According to Charles as,
the value of a gas and in the absolute temperature constant negaure
une at a temperature and the temperature in changed The new volume, Vat contart: pressure i認 von by the ent
Absolute temperatur
-273
equation:
duct of the creature and
perature, 12 a donat
constant
nives mass of the G
under theme conditior bonature and reasure. inventical Htimbers 黑
A purine that her molecules
ontorrer manet tether they
intentio of amai” whole number, then if two bases hrhdy readt' together in such nway'that'l molecule 是遇到 conhines, say, with 2 of B to.. fora, say 2 molecules of a case
drtecules of A bind recurre "X of Blond, sive 2y of C. But by. Avondra's Hynothesis.
IX molecules of ras A nccyny a "contain volume (say Viea),then 2%lecules of as B will twic that volume (rtz: 2vcc) and Rolecules of eas C will occupy twice that volume (viz. 2V ce
她rn nitrogen nod oxys
* what would be the volume of
ronddunTixtures:
2NO
a) ecúles of nitric oxide lecule of nitrogen and.
molecule of hyde gor contrins
at least 2 atoms and its for la
of hydreren never fireg-more than 2 volumes of a gasarup Compounds. Therefore 7: molécule or bvarozen probably contains: only 2.nts and its förruls de
1 molecule of hydr gen Mar2 atoms only,
Dyetmilar razsoning we can. reduce that the at-icity of chlorine da 2, and ve this write for its formula,
Kynn ine: that the moleculo of: hydrigen contains two atoms can deduce the relation between. molecular weight and vacour den- sity pore formally as
Vanour, density of ens A
weight of XML DE A
"ht
m
ght of ʼn malsrules of H
eight of 1 molèculé of A
t1 wolecule of H
Standard to merature
The termerature and sressure.
calectad are usually and 750 mr pressure, which are hated Standard temperature and eres
(a.tin.)
Bcarple: a fortnin weight :of
an, hasa, veline of 241-ml 18°C and 753 am pressure.
by Avorndroin Hinothesis:
vo ures of nitric oxide ve 15 volume of
and 1 volume o
oxygen.
o hitongen
ce of nitric oxide rive 50 eo of nitrogen and 10 cc of oxyge
total valume of residu 1.
50.50 100-CC.
Taking the weight of an atom of hyArngôn as the unit of volecular weights and knowing that one 07. ecule of hydrogen contains two- atoms, we have:
vanour density of A
molecular weight
Let X the required valuie, Also, Lat P, V1 Prefer t the first set of conditions and P. Va Tal to the second. Then we have:
75321-760 x X (13+273).
-753 x 241 273
22
760
The tow city or
an element to the contained in met
molecule
Fer elements the atomielty, or
Lofotems in one holecule
Atonicity
ablecular weight
The hydrogen molecule. tains
Hence, molecular weight of A
x2
vapour density..
We shall use the simpler relati exambles are:
Formula Molecula
Weight:
Hydrogen+Ch) or2 ne →→ Hydenren Chloride
2 v 15.
Oxygen
cachon dioxide ammonia hydrigen. chloride
CO
Ni
Thardinrnt by Avr thesis:
22
8.5
18.2
Bate Anothe type
of sait.
Dilute hydrochoric acid acts
·with menenium, zinc or trun tˊ
duce the actallic chloride land. hydrogen :
Mg HC M=C1
re rest on proth end Be soon. sted because the metal will be ented with grimaoluble lnypr.ne
ead chloride.
Dilute hydrochloric acid does not Heart with conner.
Where Pnd V present the
nrensure and voline of the T15: the value of the con-tant dononde
"on the townerature and reticht of
是
Another, and very useful, Way Of writiri the law 14 thing
and Vi, Pa and game
any tun Hifferent sets of values
the preesire and volumn, Hence
g. Charles" Lay:
If the pressure to kent constant. the value of a fxad welation
Gor-Lurancis Lau of
mss law, describing the behav our of geses, when involved in chimical reactions, was stated by Goy-Danac as follows:
WAN TABng react they do st Which bonA SEVIC ratio to one another, and to the volume of the duct if sepe tounérature and pressure, zomain- ine constant.
For examples:
Swis hydrogen + 1 vol. oxymen
= 2 vols, steam.
1 vol. nitrogen + 3 vls, hydro-
er 2 vols. art. Tel. nitrnren + 1 yl.cuyiren
volandtric
ride.
Chiari
Hydrocen Chloride
PX Mols:
Hyfvnren + Chlorine
Hydrogen Chloride
l rolecule of huianmen caloride rust contain a while muhaben nÏ hydrer atoms, hecruse alims
2, 3 ac. ntama.
avecule of hydrogen, con- fugi 3,4, or 6 to, atoms.
of
Questions for this weak:
1. If the pressure on 240 cm
ensincreases from 760 to 777 at constant temerature, "hat
the new volumeP
2. 65.7 .am of dry ns at 19°C and
740 me pressure reigh 0.1212 -, Find the M.". of the gas.
3. 100 co of a mixture of carbon
monoxide, nitrogenzand. hydrogen are burntin 150cm(nn: excess) af oxygen, and the final volume after cooiling is Tun am. Find the percentare composition of. the origin mixture
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