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四期星3四廿月一十(八八九一)年七十七國民華中
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「路上」研討會的開來禮 會的書來自不同的亭 蔡佩英。 四 [乏家庭温暖容易造成鸻 長張灼祥、香港小窋翠年身心鞬康」。演講完 前 她指出,青少年族 門保良局董玉娣中學校 况分析」及「促逃评少」 【行政系阿雅致米,屯港好少年身心發 防止自殺會的個案分析 醫學院兒科商我講師 出席該研討會 - 參加者 上表示,根缺撒瑪利亞業行列,包括香港大學. 漫二百名參加者 忠啓、香港大學醫學院 主要是青少年工作者和
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【特烈〕中山隆鎮地桓,頑利:林東店、 導;王忠、创棄捨。被
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一-亦不准用蕞枝角道 在桌荔枝角道发行东博 車。封妨喝,悔不 上午五時三十分皙通 當日凌焿:時三十分案
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十二月十日舉行
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會的精神。. 柔和的榮,對照:五十八二三所謂時間蛮力,湖 一又說:「這次赝 欗委員會秘書隠鞑㷷职 艾庑猞一般似是而非的 「調而飽滿,是不似乎界
我想香步行籌備委員 他又呼籲其他團體| 我份聲明指出,改 公案疑,並應安分行教手及本署步 决定赛示湖之不滿及火‘新世界大酒店海景餐廳 大雄舉行百萬行」,厚 活遊運灘位、雪,號基本法體委會改判小组 評選的行啓受宫的椼烧 長沙灣道 「會發言人說:「這是公 參與過所有意義的慈善 制小組决定九七年後行 港旅遊業協會覺選第一九八八年度全港傑出 五門名及直可起著民的生理放和一錢府之一。並於日前以吞惓有特出院舉行頒獎 二月十日(星期六)在了豐富的娛樂節目,包法起草委員會明,對選舉團作試過渡到民主 角過來行,欸州街及一 “獲選爲全港最傑出食府 香
告發出後,本滑演风及 | . 「自慈善步行的油 家撼,和水醫言員的设奎 月 十一月(汛期三)就止收)、海景餐廳經理到雞燊(右二)、災團公 衍,歡迎十六級或以上入士安經理歐陽惠敏小妮(左二)及欧贲佈經理严花 野六左一)予張獎典禮時合攝。
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中文兒童讀物創作獎」,將於 「港)市政局公共科畫 安心樂事;轮胼於出,欣賞東方之珠的夜景, 钻野馘港景色;苦國時分把正談大,更是! 衲靜優雅。餐婚内大部份餐桌均航者落地玻 儀式。海景餐鱝位於新世界大酒店四樓,發一 ,維多利亞海港遨人服筇。在此進午
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人士已答州持慈善步
李嘉欣和多位就知名運動阿
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公路中天微郊野公
終點。
獎作創物讀童兒
稿收止截底月本
「兒童故事」組以文心得 在義而又往是湖兒選威战神疑 乘二二芝型米)的国语故事進 妈一本廿八百八饼面就一九六
·韓级巡隗文字,並領能偏印
經牛寮、田夫仔、大號」的苦驗和智力發展。 | 浩筑儿耘之起酯),千限,內容須有途和易於跲游,並符合兒髽 踟 綿璡站八楼村主,亦可以插圖,文戰復出,字牌以三
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最傑出
1989 中學會考預習專欄 明德出版社
MILT & DALE PRESS
Chemistry (9)
Unit 5: (Continued)
5. Volumetric Analysis
R. Chu
5.1 A standard solution of a substance is a solution of accurately known concertration.
5.2 The titration is a process during which the solution of one reactant
is run from a burette into a known volume,
25.0
the cm3 of e-g.
the solution
other 01
reactant. until the reaction
just complete.
is
5.3 The end-point or equivalence point
titration
that of
denotes equivalent numbers of moles of the reactants have been reacted, 1.e. the reaction is just completed.
5.4 The end-point of citration can be detected in a number of different ways, such as using an indicator, measuring the pH values with a pH
measuring meter,
the temperature changes, etce.
Question 9
(a) What
OF 0.05M 1,504 is required to neutralize completely 25 of 0.1M Na0?
(b)20.0
of hydrochloric acid
neutralizes 25.0 cm3 of
sodium carbonate solution, what is its molarity?
6.
Thermometric Titration
The essential reaction neutralization is
in
1989 中學會考預習專機
明德出版社
MILI & DALE PRESS
Economics (9)
LOCATION OF INDUSTRY
Alair Li
Location of industry means the site at which a certain production Lakes place. There are 3 types of factors affecting the location of an industry: A. Natural advantages
Natural advantages refer to those benefits provided by nature. There are 4 natural advantages: 1. Availability of land
Apple supply of suitable land at reasonable price is important to most industries.
2. Suitability of climat把
Some industries may retire a
particular type of climate。
3. Nearness to labour
Labour is an important factor of production.
industries wish
to
â
which is exothermic, thus resulting. ima rise in the tendereture of the reaction mixture. When an acid is added slowly into a given amount of an alkali in a reaction vessel, the temperature of the mixture will rise gradually until the alkali present is totally reacted. If.the.
is of the mixture temperature plotted against the volume of the acid added, a graph as shown below is cbtained.'
Temperaturn of
[xfura/
ct acid added/cm2
beginning, the alkali is in exces and the acid added is at once neutralized, giving out heat and hence causing the temperature of the mixture Lo rise until Von of the acid has been added. At this point, the temperature of the mixture is the mgheit. Beyond this volume, any ker addition of the acid will make the temperature to drop for asons: firstly, there is no nore leat produced as there is no Hot neutralization taking place, and Secondly, the acid added is at Wer temperature. than. the niture and
lowers hence
the tempestre of the mixture. The volum', denotes the end- point, as it gives the volume of the acid requires to neutralize aikali originally present.
Question 11.
5 cm3 of a 0.05M solution of a
metallic chloride is added into various volumes
̇silver of.. 0.1M
nitrate solution. The mass of silver. chloride precipitated in each case is determined and plotted against the volume of silver nitrate solutioaded.
Values of 0.1M Agh, solution
(a) Give the ionic ecuation of the
precipitation reaction.
(b) Determine from the graph the volume
Of 0.1M
required ACNO precipitate all the chloride ions? (c) Calculate the number of moles of chloride ions in 5 cm3 of 0.05M Metallic chloride solution?
(d) How many moles of chloride ions are therre. in one male of the metallic chloride?
tc
Let x cm3 he the volume of H2S04
required.
(4250) reacted =
TUCO * 0.05
n(NaCH reacted
0.00005x mol
25 1000
X 0.1
0.0025 mol
0.00005x
0.0025
X
25
(h).WayC0g+2HCl)
1 mol 2 mo]
0.0025
Let y M be the concentration HOT.
n(HC)) reacted
(NCO) reacted
y =
x (25)(0.04)
20
Solution to Q.10
(20)(y) 1251(0.047
(e) If there are 1 mol of metal ions in M(NaCOgXHO) (106+18x)g mo)~1
mol of metallic chloride, what would be the ionic charge on the metal ion?
Question 12
·25.0 cm Of potassium hydroxide solution, and a thermometer were placed in
The û polystyrene beaker. temperature of the solution was noted. Into the beaker 0.5m hydrochloric acid was added, 5 cm3 at a time, and the temperature of the mixture after each addition
noted.
results The obtained were tabulated as below.
Was
A similar
be Would obtained if adding an alto a
cf given amount reaction vessel.
put of 110How do 15 20 25
15
The process of obtaining the end-paint by measuring the temperature
during changes reaction is known as thermometric titration.
Question 10
4.C5 g of hydrated sodium carbonate (Na2CO3.xH20) was dissolved in water and the solution was made 250 cm3, Using methyl orange as the
25 2:3 indicator.
Of
solution the required 30 cm3 of 0.05M H,50 for neutralization, Find the value of x in the chemical formula,
supply of cheap labour.
4. Availability of energy
Most
industries
raquire
electricity, coa: or gas as the fuel for production.
B. Acquired advantages
Acquired advantages refer to the beriefits produced by human actions. There are 3 acquired advantages: 1. Better facilities
When there are a number of firms of the same industry in an area,
services. better facilities or like transports, fire service,
lines and. telephone
power ̇supply, etc, will be available
2. Supply of skilled labour
Skilled labour usually gather around where job opportunities are very
because many localization.
3. Development.
industries
Ancillary
of
D5 ancillary
industries will
develope in the same arca
serve the major industry,
to
Plot me temperature of the mixture against the volume d added"
HC
(b) Read from the
most graph the probable
of volume
0.5 MHC required to neutralize 25 cm3 of
(c) What is the concentration of the
potassium hydroxide solution?
Solution tu Q.9
(a) 2NaOH+H250,
2013
1. Industrial assistance
It can grant loans on favourable 'ofter exemption from terus,
luwer some taxes or charge a price for land to firms that are willing to locale in the areas selected by it.
2. Industrial estates
It can set up industrial estates in selected areas and improve the transportation and other
oocial facilities.
3. Licensing
It can only issue licences to those ficas operating in particular
industry
selected area.
DIVERSIFICATION
in
far.
If localization goes too overconcentration of an industry will cause 3 main kinds of problems..
A. Environmental problems
There are air and sound pollutions, avercrowdedness
ccngestion.
B. Unemployment problems
and...
traffic
The overconcentration af industries
C. Government Policies
Jocate in
A government can
influence
the
in particular areas other
areas
of
may deprive employment
areas where there is a plentiful
location of an incustry in 3 ways:
opportunities.
「效廣法刊明香
本
物之性有指政
刊告律登合港月 「九報力廣龐讀印柯必社必學必家必工 强告大者刷式有團讀生備庭覽商 有效關定府日叁在
n(NaC x20) dissolved
4.05
(106 + 18x)
mol
n(NaCO3 xH20) reacted.
25
4.05
0.405 (106+18x) * 250* (106+18x)
30 n(H2S04) reacted = 1000 x 0.05
-0.0015 According to the following equétion | Na2CO3·XH2O+H,SUG
1 mol
(Na,CO2 xHC) reacted
reacted
0.405 (106+18x)
0.0015
0.405 106+18x
= 0.0015
Solution to Q.11
(a) Ag(aq) + C(aq)
AgCl(s)
(b) Vol, of AgNO, required - 7.5 cm3
(c) Ag*{aq) + C}^{aq} - AgCl(s).
1 mol
C. Rising factor prices
The overconcentration of an industry in a district may result in keen competition among firms for similar
of production types factors. Factor prices and so the production cost may become higher.
To avoid such problems, a goverment. usually adopts policies diversification, encouraging industries
to spread out over various regions of the country.
THE LOCATION
OF
INDUSTRIES
HONG KONG'S. MAJOR
primary
While the location of industries In Hong Kong is mainly determined by geographical factors, the location of secondary and tertiary industries are mainly determined by economic factors and government policies.
The Iocations of Hong Kong's major, industries and their determining Factors are as follows:
A. Primary industries
ធម៌
Hong Kong's primary industries are mainly fishing, farming and quarrying. The fishing fleets are based at Shoukiwan, Aberdeen, Sai, Kung, Cheung Chau and Tai O where
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廣告部電話:5-490884
n(c) in 5 cm of solution
n(Ag) precipitated (AgNO3) reacted.
=(0.0075)(0.1) = 7.5 x 104 mol
(d) nimetallic chloride) in 5 cm3 of
solution
-(0.005) (0.05)
:2.5x10-4
moi
* 2.5 x 10 mol of metallic
chloride gives 7.5x10 mol
of C1 on dissolving,
n(Cin 1 mol of metallic, chloride
7,5 x 10
2.5 x 10"
0-401
1 mol of metallic chloride
contains 1 mol of metal ions
and 3 mol of chloride ions,
1 formula unit"
of the
metallic chloride consists of. 1 metal ion and 3 chloride
the ionic charge on the retal ion is +3.
Salutip to 0.12
(a)
G
20
10
Volume of 0.5 M HCl/cm3
{b} yol. of 0.5 M HCI required
» 31.0 cm3
...
(c) 25 cm3 of KOH is neutralized by
31.0 cm3.of 0.5 M HC1.
Let the concentration of KCH be 发愁。
According to the following equation
KOH + HCT>
1. mi mo
n(KDH) (25)(x) n(HCT)" (31.0)(0.5)
x = 0.62
be
shelter, Jabour and ancillary industries like marine engineering. and fishing equipments. can found. Owing to the development.of. new towns, vegetable farming and poultry raising are only undertaken in the undeveloped rural Besides, major quarries are located at the north-eastern part Kawicon.
B. Secondary industries
areas.
of
The government, as the sole supplier of land, can influence the location of the major secondary industries in Hong Kong with careful planning nd development, and electricity transportation, water supply, amenities and labour housed in the public housing estates
available at the industrial ·areas like San Po Kong,
are
Kwun Tong, Kwai Chung, Tsuen Wan, Tuen Mun and Tai Po.
C. Tertiary industries
and
The major tertiary industries like tourism,
finance banking, shopping are mainly locoted in Tsim Sha Tsui, Central and Causeway Bay
customers where a lot of related facilities or services can be found...
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