1969-01-08 — Page 14

真二張四第

日廿月一十年申戊歷夏

WAH KIU YAT PC 韜日僑筆

1969

會考試題預習

化學科

(D)

王錦釗

CHEMISTRY (10

When a dilute solution of hydrochloric acid, is heated,

the vapour evolved contain

pure hydrogen chloride, because it has a lower!

boiling point

a mixture with the same concentration as the

solution

(a mixture with a lower concentration of nvdrozen

chloride than the solution

a mixture with a higher concentration or

hydrogen chloride than the solution

water vapour only

Which of the following statements is always true?

A hydrogen chloride forms a strong acid when

dissolved in water

hydrogen chloride forms a weak acid when i dissolved in toluene

hydrochloric acid dissolves metala liberating hydroger

when chlorine is oxidised it gains electrons?. chlorine reacts with bromire

立禮

《一九六九丰中文中学會考試題

英文科

LESSON TEN

CHAPTER TWO

CF) ·王淑方

[APELL OPE, 若剩于像室主持

费

新春開

*生季

REBUIE HENERS-W 而致火絕,又一般过林西對地方不数图解, 之貧苦只袄,徐徐由於一開辦有年,但前以擁有

因經濟關係,故啓前只 協助一緻镰駕事实。又一動,被笑不 CRINKLERT-HAERE-LESS 又該校花考下黑期

*ISDEFENSE. 20 GESCHER

一,在擘導期間,將一二東瀘,預計下圍內 致青官瓷爸点万吳展 可以繞成使用,將亮再

控

生,定本月十九日行

他救同學,致無此事,一入學試,現已開始都名。

-對,随即可見心,

於夜小英之葳做一事

有關小灣校方面

官立文商學校

明車業授憑禮

「各一班,五六年級各两 | 校兵奥德升菉詞;吳 一路,合共八所,民過上一大頒發文槳, ,計有小學一四年級書院院長訪中文大學 「已於去於十月初旬關模一加土高道与兼营彩有學 ,現有學生約三百多人「院集行以選應小 新進 HER÷F (5) IF***-*

察校監崖碑立(FR.T,商劉材交學亦有七十六。 -PREKKEREJSEK

快一

三期星

小顶顶

日八月一年九六九一曆公年八十五國民審中

[FI8C1K-EX

,在做實本港女灣時,

學公會商廠布

公

之青年,忘岁盈後選

KENT488 FIVE DE

|BDDLENAKEY

BENERKEKKE

主會載影票習夜小學ㄪ開招

淑港夜事小之不足。

TEREVIE

KANKREI

INHE 【招核重降下教育姿舞會 建校之同學。品們以工 致小桌招待新聞界,介一天,而彼他皆爾俗專 li於目前儂責大仙天主及教叢莫七名,合共九 | 我大專事會教育委員會,校長一人,廚校長一人 按該委員會稀吉米·李,至於研究方面,則

(特扒)香港六主一:目前湖夜小事設有 RONSKEESEE

中小學 計劃在新區及徙置區開辦夜

KHEKLEI

数力發展夜教育

|商專上同擊對目前本米

勞商之一,其目的在提

* TURKRAK*E*

此外,該會之未來

XHERNBE-NE **** REEV

VEE SHPIR

一組機方面,設有主號及分別開花費夜的 第一小學,在該网联工作一

★教儒者:

Hydrochloric acid is used in flame tests. for the i

following purpose:

A to act as a flux

E to assist combustion -

© to clem the wire

I to colour the flame

1 to volatilize the salt

During the electrolysis of brine using a carbon anode, chlorine is liberated at the anode becausa,

A chlorine is attracted by the carbon anode⠀ F: Cl" is lower than OH" in the électrochemical ̧

series

COH is lower than Cin the electrochemical

series

P

the concentration of the vi 28 much greater than` that of the CH-

the solution of sodium chloride la mutral

To test for the presence, or UL ions in a solutions which of the following groups of chemicals would us you use?

barium chloride

dilute nitric acid

farrous sulphate and uncenti

paur

lima water

silver nitrate

Which of the following metals will not displace hydrogen from dilute hydrochloric Bodd"

copperz

iron

potassium

modium

Chlorine reacts directly with all non-meta,

except

carbon

II nitroges

TV silicon

gulphur

Which of the following alternatives. Le correct?

I, II and III only

II, III and IV only

III, IV and V only

I, II, III, IV and V.

None of these combinations)

When ensure reacts with a cola luce soluble hydroxide other than ammonium hydroxide, it forms

perchlorate ions only

I chlorate ions only

chloride ions only

(SOLUTIONS »

mixture of chlorate and eniorius ons

ture of hypochlorite and chloride im3)

GENERAL ENGLISH

HE ARTICLES

The Demonstrative Adjectives

'the' are usually called Articles.

indefinite' Article.

1-1969.)

and:

'A' ("An') is called the indefinite. Article because it leaves indefinite the person or thing spoken of..

a boy:

a boat

Le book

any boy

any boat

any book

is used before a word beginning wi consonant sound.

e.g.

NOTE

a girl,

man,

a ship,

book. When words begin with a consonant sound of yu' we also use the Article *a!

a university,

a union

a European,

a useful article.

An' is used before a word beginning with vowel sound.

·NOTE:

An orange,

an apple, an island, an hour

an enemy,

in hear,

an honest man,

in umbrella. The words 'hour' 'honest' and 'heir begin with a vowel sound, as the initial consonant 'h' is not pronounced,

'An' is also used before words beginning th' and not accented on the first syllabl

An hotel an historical novel

finite article.

The is called the Definite Article for? ît points out some particular person or thing spoken af.

She sent for the doctor..

some particular doctor. He put a pencil on the table.

some particular table,

THE USE OF THE INDEFINITE ARTICLE

The Indefinite article is used oni countable nouns.

year,

a book,

With the meaning of one'

He gave me a fork,

I have a brother.

child.

In certain expressions of measurement;

He likes to drive his car at sixty muies

an hour

She goes to

He sells the butter at 5s. a pound.

Before dozen, hundred, thousand, million

She gave me a dozen eggs.

A hundred goats were in the plain.

Before singular predicative nouns denoting

profession,

egi

trade, religion, class, etc. My brother wants to be a teacher. John's sister is an accountant..

NUTEL If the noun denotes a title or office ac

can only be held by one person at a time, indefinite article is not used,

They elected him President of the

Geography. Society,

(noti "a president')

indefinite article is also usta co rarer:to rson known only as a name.

"A Mr. Smith rang you up this morning when you were out." Jack told Jiny (The A gives the meaning:

Jack has no idea who he 18, put në juat told Jack that his name vas Mr. Smith).

f. With the meaning 'same' in certain expressions:

The two dresses were much of a mixe, (1,e. The two dresses were of the

same size.X

(g) Before a noun in apposition wusu sue Voing or!

person is assumed not to be familiar

Jill Smith, a housewife in Lancashire, was hurt in an accident yesterday,

In exclamatory-sentences introduced by "What', where the noun is singular and countable What a pretty girl you are!

What a clever boy he ist

ANSWERS TO EXERCISE 10

1 asked my brother in with him,

2) The hunter asked someone if (whether

had seen a wounded hare.

(3) He asked if (whether) Kelly was going

England.

(4)

(5)

(6)

Jack asked John it (wherner) Joan had fed the dogs before sunset,

He (She, etc.) said to me (nım, her,etc.) that he could not find his pencil and askeo ne if (whether) I could lend him mine. Edward asked his mother if (whether) it was true that Eddy was leaving Hong Kong for America.

He (She, etc.) asked me if (whether) they had all gone to the party last night.

8) J111 asked me (hin, her, etc.) where Ann had

her hair cut

9) The tourist said that he (she) liked Chinese

food very much,

(10). She said that she should be reading exactly

the same book the following Wednesday, as shy was reading that day.

[11) The merchant said that he must go to the bank

before it closed.

(12) B1 sand to Ann that she was an excellent

singer.

(1) Chan Sing said thet ne was whinese Dut

learned English at school,

na

(14) Liran said that she would take her (him) toi

the cinema.

(15) She said that she was going to swim the next

When dilute nydrochloric acid heated, it will boil and becomes more concentrated. It finally reaches a concentration giving a solution. containing 20,26 HO1 by weight. This solution will then boil at a temperature of 11000; and is called a "constant boiling mixture", that is it boils without any change in composition. Since the dilute acid solution becomes more

vapour

a mixture with a lower concentration of a hydrogen chloride than the solution is given off:

When nydrogen chloride ja covalent compound) la dissolved in water, hydrolysis takes place with the formation of nydroxonium ions and chloride ions

HOI

hydrogen

chloride

molecules

tio

J

hydroxonium)

ion

Nearly all the hydrogen chloride molecules. are converted into hydroxonium and chlorida ions in dilute hydrochloric acid. Hydroxonium ions are present in all solutions of acids and. are responsible for their characteristic m properties, e.g. sour taste, action on indicators, etc. Hydrochloric acid is a very typical strong acid, and shows all the usual

reactions

It is usual for the less electronegative ion) to be discharged at the anode. It is possible for the concentration of the ions to exert some influence upon the discharge of ions at the anode. In the case of an aqueous solution) of sodium chloride, there is a mixture of Cl ions and OH ions in the solution. Although is higher in the electrochemical series the OH, the Cl ion is discharged in preference because the concentration of the ClTM is mak greater than that of CH",

RICH SALYOP nawala solution is added to a solution of a chloride, a white precipitate of silver chloride is formed, which is insoluble in dilute nitric acid but soluble in ammonia solution***

- AgC1!

silver 1 chloride.

NO2

Inis is the characteristic test in thr laboratory for soluble chlorides.

SAGE ASK Lower than nydrogen in the electrochemical series, and is therefore unable to displace hydrogen from dilute

aclos:

Down sulphur and silicon will react directly with chlorine?

Unlorine Dubbled through molten sulphur fori

liquid, disulphur dichloride

waen silicon is heated in a stream or chlorine, a liquid silicon tetrachl obtained

Si

012 31017

Carbon, nitrogen and oxygen do not react! directly with chlorine./

CASINO ACOD, WIDN Mlamus voust10 Sou solution, for example, a mixture of sodium chloride and Bodium hypochlorite in solutio La obtained."

Elo 2NaOHNC Machero Ho

estions for next week (11)!

You are provided with Iron Filings, powdered "1 sulphur, concentrated hydrochloric acid, water, Bru the usual laboratory apparatus, including a lighted burner, but no other chemicals. Explain carefully now you would prepare and collect some resa ocla D27. pure nydrogen sulphide.

What 18 the action of this gas with solutions of (a) lead nitrate; (b) litmus; (c) ammonia (a) ferric chloride?,"

Desuride a laboratory mathod for the preparation ang collection of dry sulphur dioxide. Give two chemical and two physical properties of the gas. tention two industrial uses for sulphur dioxide.