1979-02-19 — Page 28

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1979

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中國歷史 (十九)

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(5)五四運動 月

2007 [HCR AUKERAONZ.

71 PAGEWASA Tran

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對。陳圈

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1979

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|經濟及公共事務(十九)

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Economics & Public Affairs 15.

Population

IIL Effects of rapid growth

of population on the society Society of Hong Kong

Hong Kong's rapid growth of population since the Second World War has resulted in the following social problems:- a. Land and housing: Dense

population in urban areas has made rent creeping and the supply of houses. insufficient. Therefore overcrowdedness,

unhealthy squatters and

tenancy disputes arise.

Health and enviroment: Due to overconcentration

1979

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化學(十九)

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Chemistry (19)

Question 28

The following results were

obtained of an organic compound Z:-

(D) 0.37g of Z,

on complete

combustion, gave 448cm3 of carbon dioxideat s. t. p. and 0.45g of water vapour.

(II) 185g of Z, when

vapourized, had a volume of 560cm3 at s.f.p...

(II) Compound Z reacted with sodium to produce a colourless gas X which gave

a "pop" sound on applying a flame.

(IV) Compound Z could turn

acidified potassium

dichromate from orange to green on prolonged heating

of the mixture.

(a) Using the results in (I), try

to calculate the empirical formula for compound Z.

(b) Using the results in (II); try

to calculate the relative

molecular mass of compound

Z.

(c) Hence, or otherwise,

determine the molecular

formula for compound Z.

(d) Using the results in (III) and (IV), give the name of the homologous series to which compound Z belongs,

(e) Give the IUPAC names and

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(2)6月4日 十三菱修生三千人 ETATEM AREALIKE 主波农門集會示威抗倒,由华大

(3).田要求段政府很曹汝保、京宗

2游行學生沿途高呼「打倒餐國賊 可口號,李敏家樓搞索古老,雖

學生多人當場被捕,是爲「五四 SOUT

of population in urban areas, space for public amenities and medical facilities have long been

felt insufficient. More-

over industrial growth

has made many residential and

industrial buildings. mixed together. All

these result in pollution. and traffic congestion. Social welfare: As ar result of increasing population, the need for social welfare services. arises. Social problems such as crime, drug addiction, family problems, and juvenile delinquency are thus created.

Reasons for the population

control in Hong Kong

Population control is significantly important in Hong Kong for the following

reasons:

a. On the negative side of

population growth, it

you have mentioned in (d).

(f) Write an equation for the

complete combustion of compound Z...

(g) What is the minimum volume

of oxygen at s.t.p. required

for the complete combustion of 7.4g of compound Z.

Question 29..

(a) A set of 10 test-tubes of

uniform bore, each containing 2cm3 of 0.5M solution of a metallic chloride, had varying quantities of 1 OM silver nitrate solution added to them separately. A white precipitate was formed in each test-tube and after centrifuge, the height of the precipitate was measured. The results were plotted on a graph paper as shown below.

of precipitate

elative height

2

3

Volume of 1.0M AgNO3 in cm3

(1)

Give an ionic equation for the formation of the precipitate.

(ii) What does the flat portion

of the graph indicate to you?

C)「醒」形岛未决。

(2) 新年包括文中

(3) WEAR NTARVIKE • T

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面去分析「五四北上的影 串)五四漫的背衰。 (1) 191

2由間』與『二十一鲣欸]

can be an impediment to economic progress. It poses a heavy burden on the community in the sense that the provision of adequate employment for a growing labour force can be difficuit, and that resources for economic development. may be diverted to meet the immediate demands of an increasing number. of people for basic goods and services, such as foodstuffs, housing, education, medical care, transportation, etc.

population

Brows rapidly, per capital income may be reduced This means that the income earned by each individual falls since st the Gross National

Product will be shared by a greater population size.

b. As

Unlike most Asian countries, Hong Kong is characterized by an silver nitrate just enough to precipitate all the chloride ions in 2cm3 of metallic chloride solution? Hence, calculate the amount of chloride ions in 2cm3 ot metallic chloride solution.

(v) How many moles of chloride

ions are there in one mole of metallic chloride? (vi) What is the most probable

lonic charge on an ion of the metal? (vii)Using M-aa the symbol for

the metal, write down the formula for its sulphate. (b) Describe briefly a chemical

test which would distinguish between the two substances in each of the following pairs. The results of the test on both substances of each pair should be clearly indicated. (1). Two aqueous solutions,

one of which contains Todide fons and the other chloride ions.

(ii) Two solids, one of which

is sodium sulphate and the other ammonium sulphate.

(ii) Two black solids, one

of which is copper(II)oxide and the other iron(II)sulphide. (iv) Two gases, one of which is propene and the other

propane.

(v) Two liquids, one of which is methanoic acid and the other is ethanoic acid,

Question 30

structures for all the possible (ii) How many moles of metallic (a) A series of reactions on ari

isomers with the molecular formula of Z, belonging to the homologous series you

chloride in 2cm3

solution?

of

(iv) What is the volume of 1, M

reddish-brown solid A is summarized in the following block diagram.

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extreme shortage of natural resources. Population control is necessary to reduce the growth rate of demand for foodstuffs and

other necessities.

In the past few ye Hong Kong has experienced a rapid process of industrilization and becomes an export- oriented place. But inevitably Hong Kong has lost her comparative advantage in labour- intensive products because of rising wages at home. The only beneficial way to maintain her exports! competitiveness in

overseas markets is to improve the labour skills and industrial

technology. To achieve this, a good human capital must be. improved. Thus it is

black powder

F

strong heating

Conc. H2S04

heat

green

Cipitate

white powde

TE

B

strong heating

aqueous NaHCO3

water

bluish- green precipitate.

aqueous blue NaOH

solution

ID

A colourless, pungent as G is evolved when solid A is heated with cone, H2S04. The gas G turns acid.fied potassium dichromate green from orange.

Solution C also gives Don adding aqueous ammonia solution to it, but,

D re-dissolves to form a deep-blue solution when an excess of ammonia solution is added.

(i)

Identify and name the substances, A, B, C, D, E and F properly. (ii) What is gas G? (iii) Write an equation for

each of the following conversions:-

(1) A B

(2) C-D

(3) D-F

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Aimed to

the

necessary to have adequate training.

programmes for the young genreation, while at the same time population control is essential

In recent years, Hong Kong has experienced serious inflation which adds difficulty to her export sector: To curb Inflati on, one of the effective way is to control the rate of Increase of demand for foodstuffs and . necessities by keeping down the growth rate of Population. Population control in

Hong Kong can ease the burden on

providing Social, and

administrative services to the community, thus

releasing public funds

for the improvement of the economy and assistance to industry.

(4) C→E (5) E-F

(iv) Name two gaseous

reagents which can convert. F to A under suitable conditions.

(v) Give an equation for the

conversion of F to A, using either of the.

reagents you have suggested in (d).

(vi) Write an equation for the

reaction between D and excess aqueous ammonia solution

(b) W, X, Y and Z are elements, in the same period, but in the groups IV, V, VI and VI respectively, of the Periodies Table. All of them can form simple, covalent. stable hydrides with hydrogen under suitable conditions.

(1) Write the formulae of the

hydrides of the elements W, X, Y and Z

respectively.

(ii) How many bonded

pair(s) and lone pair(s) of electrous around the elements W, X, Y and Z separately in the

hydrides concerned? (iii) Using the electron pairs

repulsion theory", draw diagrams to show the most probable 3-dimensional

arrangements of the atoms in each of the hydrides.

(iv) Mention the shape of the

molecules of each of the. hydrides.

(v) Arrange the hydrides of

W, X and Y in the

ascending order of the angle formed by the

bonds between hydrogen atoms and the central atom.