報日僑華
日二月二年四七九一座公年三十六國民華中
濟經育教
六期星
响程趨界
港元至二千一百港灣。 。另外巴基斯坦甘支中下级棉紗約三千包,Fi0,B,毎包二千C五十 [慶三月交貨,四十五支混紡紗FIO,B,每磅二元二角至二元三角美金,用以開採印尼總祠。 據紗商透露:印尼商人來港購買產混紡紗,已成交約有二十萬磅,一千萬港幣之木配備
級棉紗三千包。 買港產混紡紗及巴基斯坦棉紗較多,外銷則有較好開展。 特朊昨°C一)日棉紗市,本網交投雖然疲,但印尼商家來港購 印尼商成交廿萬磅,另巴廿文中下海商斥巨資
棉紗本銷雖呈疲慢
混紡紗外銷
英國鋼鐵如缺煤而減產 COOR至ISOVIOR,卅二支中級碗主」、六五○RAIN. POCK 至一、九七○元,中級謀定一、八八○元至一九CO元,十支中級簡] |橏梳、八五〇元至三、九〇〇元,巴基斯坦十支中級雙生一、九五OR
·現一六五口元至三,JOOR,四十支A級, 六元至一
〇元至三、四五〇元,ABKIT 八〇〇元至二、八五〇元、9 LIO元 · 空氣枋、FOOR 至 三〇元·計支A級二、五五门元至 |1}+ KCC元 : A8級二、五〇〇元至1.4l〇元,二支A級四C | 於最近
〔特 英國
工期影响英淨生產,
程度枝輕的川挽不利 趨緊綢,香港亦將遭受 |界镡供求勢將因此更
·據悉:由於受英國求。這種趨勢必將更加 煤嶺工人罷工工裼的影拉緊愴界性葉滾之供號一百六十九元二角,少見 千餘兌二百四十五 ,英辆便會向外購鋼 重,但若超逾三成的話,純湯-8- 工業生產影响並不大 | 生產線 | 料以平衡國內鋼源N 供 R,日供低成一大九 TO : 一萬日元兗一
爲三成,則對英國之 生科:英減產者一百馬克兌一百八十元
間接影响香港鋼鐵供應
生工街
有,英軍鐵生產已面國」。香港工業生產茶精邸角灣 大隔沾產的咸等。富倫,此遭受此種間接性不利」 歐洲金價
價
蛮於三火星 青描頓己印那他鄰五,之進有·拖於機之,有
九順廠建該到山得人 君七的,造公司
近照
|掂百分之101十左右。 |氣重失調,英國國內工,在同期增加一倍以上
·歎消息透露,某規模」之影响。 . 霦4英國煤碳工湖導致本港鋼料之價格約較去
大N 鐲 生 機羼之鋼, 香港之鋼&主要來
·據木泡鋼粱業商求解之進口極少。目前爲U收市價 魏爾量,將於四月份自本產品及中國大陸各地黃金收市價如 CREEKI+
出
,
·業生產發展固然遭受戲,是泰張致使調派廠
法闖克福|
港,诚迥年
·重之打擊,而冰港了扛一減產影响所致。但大陸
世界去十寸 循共年五有世
有十萬比人界不转睛
·業生產,幾無直接的打一台灣及日本之林強調,五八一六,七方世界共有六十九萬噸
影响却是漲然的。 . 界劉源供飆拉緊的間接英對財產所給港工業 業,但受英鋼故產, 在量尚屬珊定,至於因 「來之間接影啊程度不大
限公司董事會經理顧問 見端倪。
·香港穎榮調有,則要過一段時間方可
恒隆旅業有限公司
晉有
「挝陲(業)有限公司一角,馬紙高成二
·日作宣佈晉升總經理閡一〇〇,一百馬元免
公司近期將大力拓展其jli 〇〇,即一百披治
黃亦女晉董事經理
〔特訊 峘蛋有限二角半,坡紙高成二0
然,去前英陛業利
供缺又猪陸大 08
種燒界新
秀獨枝
千六挽交成市猪
四九中共拉
商方
加船月,於一
龙一批後,又告 市 市 大陸燒槐殿前日发供 猪市道,昨(19日
大國豬成共六千
俞盤三百九十五元,
期間對該瞀店之組織及 [酒店業協會一九七 一00:01. 之經驗,會當選爲香港 三元,多見一元:德抵汁元,中漿乘盤三百一十元至三百元,二百九十 仕,有超過十五年以上每一百顶第一百七十爲四百元,三百九十元,三百六十元至三百三 | 在黃氏爲酒店級脊梁 荷商成一十 · 中牙揀手冀成四百二十元至四百一十元以 業務發展,建树良多,一式中三元,一百一十元,二百九十元,幾裡七百餘頭,(包括 服務,主管格蘭酒語,瑞士高騰一五三 新界上铈一千零一十餘現,大活,三百一十 恒C虚菜有限公司一,即一百法郎免九十一團,江西,湖南,廣西,廣東,頂門,汕頭等地, 责氏於一九六六年加入一角,米紙商成九大,五. 餘四在欄,上列,大猶保從l,湖北,安徽,河 亦文先生為董事為頭。一百零五元,多出一元三二百九十元,尾二百八十元,對大貉港區當有千 C,□一百次郎兌一百 像頭,爾格酡三百五十元,三百三十元朗大爲三
钨展所長。(黃氏 安晌,當能駕輕就 ;擴大組織,就甄氏N. 爲配合其酒店業務發 [旅菜)有限公司此次
搖號;頗有質。 委員,對本→旅游菜之 協會常務委員會執行 十二年度主席,現仍
日鈔疲軟
馬元續升
股市不攝,將不會發行。; 青賽金,目前鑑於香港 香港及盧森堡上市交易 不断增加縠隻,糖要大,冇經把。償券將在 厘半計,細緻照市價加一成。 香菜 香港有限公司園發 資金在於建新船與付遠債務,年為將爲大
另一次股襟,而改向國,在現時的市劈下面
亞洲航業向國際市場發行
可轉換債券五千萬美元
資金的目的在於建新船 -鼦洲伉業此次集
,部分將用以发行實事
「指出;
料報告:.醤 梁安象息率及萬換低的
·發表亞洲航箂公司查,份之十計算,不過該償 須要集一集安金以 TA& CO.HK LTD,洲航築股煤股市價加酒,在短期內該公司可 可VICKERS,DA COS 換佩格將照戴止日的摊一群球船公司發展情形而 美元。據能在遠證券公 將媸年息六風半,而一以收集資金,根據目的
·市集資金五千萬租料批僕券的息率 在過去首發行多次股
合由洲。可國洲公
而有條換叅 發際經
由限件僕 五行有由菜
唯态保缐千十限百香变
11:百 五期可轉換價五千 的可轉接慊券是香港大
,按成
竟做三少
:新經期限在
股認
辣
攀過賨洲派發香 金司形 目股航
諛往本航微行蒂以可而 前獵案 船集
少
1974中學會考試題預習專欄
化學科(甲)(十二)林景源
CHEMISTRY (12)
Suggested: answers for Last week:
as Carbon monoxide de prepared by heating oxalic acid crystale with concentrated sulphuric. acid, which acts as a dehydrat- ing agent. The mixture of. oxalic acid. crystals and conc sulphuric acid is placed in a flask, arranged. as shown in the diagram. On heating the white: crystals dissolve; effervesence is observed, and a mixture of carbon monoxide and carbon di- oxide. gases is evolved. By pass ing the mixture through a conc.. solution of caustic potash the carbon dioxide is absorbed, and the carbon monoxide passes on: and is collected over water in which it is insoluble.
Caset
heat
thisay
The following tables give the differences between the propert ies of diamond and those of graphite.
Diamond
The hardest Bub. stance known
Octahedral crys tals.
High density. Transparent.
Graphite"
Very soft, it can be used as
a lubricant.
| Hexagonal
Low density.
Opaque.
|axid1日-
Tag::or
al oxides.
reduces met joxidises
strongly heat ed carbon and temperaturesburning mag-
reducing at high
B. Chline
CuO+CuxCatco, mesium: Fe2Oj+ 300
Cos+Caco
QF +3CO2 CO2+Mq=2Mger+
Preparation:
.a. Oxidation of conc. hydrochlori acid by manganese dioxide:
MnO + 48C1
MnCl2+H20
The two main impurities in the chlorine prepared by this method are water, vapour and hydrogen.. chloride from the hydrochloric acid. Hydrogan: chloride, being extremely soluble in water, is removed by passing the gas through a: wash bottle containing water. The solubility of chlorine. in water is not very great, and the water will soon become satür- 'ated with chlorine, As the gas is.
·required dry, the water vapour is: removed by passing the gas through a second wash bottle containing. conc sulphuric acid.
∴ Chlorine is much denser than aw and can therefore be collected by displacing air upwarde. As the 19 very : poisonous, the apparatus. should 'be setup in a fume cuphoard
b. From common salt:
Instead of using hydrochloric acid and manganese dioxide a mix- ture of salt, manganese dioxide,
·and aulphuric acid may be heated. MnO2+4N&C1+4H12SO >4NaHSO +MnC1,
+2H2O+C12
c. Instead of manganese dioxide
品
lead dioxide may be used: PbO_*4HC1
•PbCl2+2H_0+C12
d. Oxidation of cone, hydrochloric
acid by potassium permanganate.
No heat is required, and the acid can be added to the flask: containing the permanganate by. means of a dropping funnel.
Five differences between the two oxides of carbon:
2KMnO +16HC1-2KC1+2MnC12+8H0
+5012
Carbon
Monoxide
density about as
denser as air.
solubil-practically ity in insoluble water
inflame yes, burna mable 7 with a pale
blue flanév
C++ COL
Carbon Dioxide
much denser than air.
fairly soluble forming an acid solution
no
reaction no reaction turns lime-
with
| 11mewater
water milky:
2. By electrolysis of hydrochloric
acid (conc.)
201
2H
Cathode of carbon or platinum, Anode of carbon.
20
1 volume of chlorine liberated.
At anode: 2C17
at cathode: 2HT 20
这个 1 volume of hydrogen liberated.
Properties::
・個四水報
It is a greenish-yellow gas
punget amell, attacking mucous
menbrane, poisonous, soluble in water.
Chemical :
1. Action of chlorine on hydrogen:
3.
2HC1 (Forms.steamy.
四册
桐,的陽生液出的里台出公共跟在,採得桐尼晚√。際已拉名僱v備通生
fumes of hydrogen chloride)
Compounds containing hydrogen react with chlorine, giving up their hydrogen to form hydrogen chloride:
2FeCl + 01 — → 2FeC1
c. Acid radical Imparted to
another substance,e.g. Ferrou sulphate oxidised to ferric sulphate:
2Fe50
Fe2 (50) 2RC1
Hydrogen taken from a substance
e.g. Hydrogen sulphide is oxid ised to sulphur:
#¿S + C1_
2EC1+ S
5. Chlorine water or moist chlorin
gas as an bleaching agent..
For bleaching action, chlorine firet.reacts with the water" and. forms hypochlorous acid, HClO; this atid readily yield up. ita oxygen, It is this oxygen which
.購商蔬差比提
提高一厘
七十調七從期利三厘率
每日貼。起中一
3. Describe experimente and give.
equations to show the reaction
ions between chiorine and:
i. Tarpentine,ii.Ferrous
chloride solution, i11,
potassium iodide solution,
臺 1974 中學會考試題預習專欄
生物科(闘程乙)(十三)本唐慕信
Biology(13)
causes the bleaching, the oxyge VIII. Interdependence of Animals and combines with the dye and forms
a colourless compound, hence th material is bleached.
C12 + B20
16801 + 100.
with: warm: turpentine
+ 8C1
C1016
Gandle wax
CGHg + 3C1
Ammonia
2NHㄢ + 3C12
d. Hydrogen sulphide
Action on. metals:
6HC1
2HC1+
Chlorine attacks and directly
·combines with all metals formin 'the highest chlorine..
Sodium burns if heated: chlorine:
2Na + Cb
2NaCl.
Magnesium burns in chlorine: gam
Mg + Cl2
MgCl
c. Zinc also burns in chlorine
Zn + Cl2'> Znclg
二
d. Iron or aluminium is heated. dn
chlorine
256 + 301g
2A1 + 301
2FeCl3 24101
Thin copper leaf also takes fire spontaneously:
Cu + C1 CuCl2 Action on non-metals
Chlorine attacks all non-metada except carbon, oxygen and nitrog The last three elements combine with chlorine only indirectly. a. With phosphorus, in a deflag-
rating spoon, takes fire in chlorine, forming white clouds. which are partly phosphorous trichloride and pentachloride.
2P + 3C12-
→ 2PE13 2P+ 5012
2PC15.
When dry chlorine is passed. over molten sulphur in a flask connected to a condenser, a reddish liquid is distils over:
2s + C12
2
sulphur mono- chloride
As an oxidising agent
a. Oxygen imparted to another.
substance, e.g. Sulphites are oxidised to sulphates.
G12+H_O+Na2SO3
+H_O+Na_So, Na_SO, + 2HC1
Na2SO4*
b. Chlorine imparted to another
substance, e.g. Ferrous chlor. ide is oxidised to ferric chloride:
HC10+ Dye
HCI) HCIO
HC1 + / Dye
colourless. The action is an oxidation of the dye.
a displacing element Chlorine displaces bromine or iodine from solutions of potaas) dum bromide or lodide:
2KBY + C1>
2K1
2KC1
2KC1
The action of chlorine on alkalis.
2
Uses:
Cold dilute sodium or potass tum hydroxide solution gives. a mixture of chloride and hypochlorite:
KCI+ KCFO + H
Hot conc. sodium or potassia hydroxide solution gives a mixture of chloride and che até:
+ 6KOH➡ SKC1 + KCL0+30 When chlorine is passed for a lonftime over solid slaked Lime, bleaching powder is.
formeds: Ca(OH)
C3 Caocla
1. Manufacture of hydrochloric
Facid.
2. Water purification, because
chlorine is a powerful killer O germs in the prevention d cholera, typhoid, etc.
Plants
1. What is meant by a food-chain ?-
Give 3 examples.
2. In any named environment, show that
inimal and plant are dependent on each other for survival.
Explanations
If you look around you, you would. notice that there is an intimate relat- ionship between living organisms. Animal -life would become impossible in the absen-:' de of plants and plant life would probably suffer considerably in the absence of animals.
As a bleaching agent, .but is. too destructive to use in bleaching wool, silk, etc. Manufacture of many organto compounds or chlorinated products, e.g. chloroform, D.D.T. carbon tetrachloride. and. gynthetic rubber, syntheti ic plastic and weed killers etc.
Questions. for this week:
1. Under what conditions would
chlorine react with a, tiñ b.ammonium hydroxide: c. aluminium, d. sulphur dioxide e. carbon monoxide.
What is the simplest way of preparing chlorine in the laboratory without the necessity of using heat? Write theequation for the. ̇reaction.
If the conc. hydrochloric acid used in the preparation of chlorine contained 36.5% by weight of hydrogen chlor- ide, calculate the maximum t theoretical yisid of dry chlorine measured at 17°C and 750mm pressure which could be obtained from 200 grans of the acid.
"By the term food-chain we are saying: that the food that animals eat is directly or indirectly that of plante. In other: words, animals feed on plants. This in mo because they cannot make their own food," so relien on the food made by planta eg.
cheapa · OoMOR
Sats
1.Kan butter from
2.Cat.
aquatio
3. Hydra
Photosynthesis
aata
animals
Photosynthesis
eats
gan
eats
Water fleas.
Photosynthesim
eats.
From this we can see that green Lea plants are the store house of energy- in order for them to make food, they ne Tar materials ----
co, and HG and nineral salts,
2
Wa know from the Garbon Cycle the part played by animals in maintaining constant supply of CO, in circulation,
2 (respiration of both animals and plants) From the Nitrogen Cycle we know that plants benefit from the dropping of faeces, by animals for the supply of nitrates which are ultimately made into protoplasm. *: The interdependence of animals and” Plants can be understood better if wB. observé life as it is in a chosen envirün- sen't such as an aquarium.
123 A-Troch vater pond is a good example
of a tolomed association" which aonai sta of a community of animals and plan ats that are confined to a limited habitats
d
The balance of nature" and interdependence of species in such a community is clearly meen. The graén water planta wuch as duckweed, LemAMILJ water butteroup and white water my produce oxygen during photosynthesiN, dissolves in the water and supply th -respiratory needs of the gill-bres tha ing! animale such an fish. The animal produce, carbon dioxide; as a result for raspiration, which dissolves in food- making (photosynthesis). The plant may be the food of some of the animals and provide shelter and support for soIO of the animals or their eggs and g larvan.
Decomposition of dead animals romaĀNO in the water as a source of mineral supply for the plants in their prêtsin synthesis. However. Exosas amountypr decay would cause the water to bej polluted.: Tika, however, is prevágtá d by the soavenging activitien of andere animale. From thing we can see thất for life to xist in the pond; tize in un intricate relationship between the inhabitants of that community. Animals rely on plants to supply d with food while planta rely on amidals for its supply of raw material to make food.
Pre-reading texte-" Transport in Plante.