1967-12-06 — Page 16

0968

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日五初月一十年示丁麽鹽

WAH KIU YAT PO a

1968)

試題額習書舖

312

英文科

(六)

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英文中學會考試題預習專欄

化學科

(六)

王錦釗,

hemistry (6)

Preparation of care, dry crystals or cocalalum nitrate.

Potassium nitrate may be prepared Ly neutralisation of nitric acid and pota-alum) hydroxide.

ANO • KCH I= _ KNO^~

HO

Add juu mu, of a Nermal solution of nitric) ield to 100 ml. of a normal solution of

pota islum hydroxide, contained in a benker. The mixture is thoroughly stirred so that the two solutions are wall mixed. The resulting solution is a solution of potassium nitrate in water, The solution is then heated gently by means or a bunsen flime until it is saturated, when a

Ang at the bottom of the beaker. The

of notassium nitrate will be observed

+

is then stopped, and the solution is #llowed to cool, When the temperature of the solution has fallen to the room temparature, large mass of potassium nitrate crystals vill have collected at the bottom of the Leaked, Thgi crystals are then removed by filtration, and are left to dry in a desiccator. (b)1Preparation of pure, dry calcium supnate

Calcium sulphate may be prepared in the Laboratory by the action of dilute sulphuric acid on a solution of calcium nitrate. Double decomposition takes place between the two substances, and calcium sulphate is precipitated)

Ca(ND); • H2304

CaSO

HNO3

meño en squeous solution in a beaker, and add doout an equzi volume or dilute sulphuric / Sold from a reagent bottle. Stir the mixtupe o and allow it to sta d for a few minutes. A hairy, white peccápitate of calcium sulphate 150 form at the bottom of the beaker. The calcium sulphate is removed from the solution by filtration, the insoluble calcium sulphate being]

collected in the filter funnel. The solid is then rinsed

combined 1, roughly with distilled water

a wash-bottle. The clean solid 19 then heated overgt water-bath to dry. #freperation >:)*: hydrous fer-ic chloride.

Anhydrous Ferric chloride is made by firest synthesis of iron and chlorine, klan dry, onloring ja passed over heated iron wi the wire slows, and black crystals of anhydrous ferrinic, loridelare formed N

answers to Exercise IV:

何玉柱

Che asked him to come back soon and not

to make them worried.

le told then to stay where they were

The policeman ordered him to put his hads

up.

He told her to look at that flower not to touch it just (to) look and. (to) smell it.

out

The teacher advised them GOT DÉ "S10cere always and never to ill-treat anyone.

Answers to Exercise V

The man said (that) he was a lawyer and sked ochester to give him an account os her. Rochester said (that) he certainl would.give him an account of her).

Her master interrupted her saving inst it had been one of them but June vaid it' had not (been). He then asked Jane to des cribe it. Jane cold him (vhat) a vonsiëntë picked up her veil and that) "dravn it ovi bor own head. Then, she said, she had re- moved the veil, (had) torn it in two, and throwing the pieces on the floor, (had) trodden upon them. Rochester then asked her what had happened afterwards.

Jane Cold him that the figur? had retreated to th door.

3. The salesman greeted" him and asked what

he ecula do for him.

14 He akclaimed being astonished at the loud-

ness of the cry,

to

He marvelled at the scene,Tanc asked acom)

nurzy, saying the sun was rising.

Today we shall have some com retension end) translation exercises... To do the sweet? notice the following omms:

answer to the point-make your answers clear and short. Remember you are onl, an swering the questions, not copying.

Try to present the iden; it is unnecca to do any word-for-word translation. then you are asked to explain word phrases in a comprehension passage, ful that your explanations can be put the passage f

The whole building was burning beau tifully.

Incorrect: Izerce (adjective) Correct: fiercely (adverb)

EXERCISE VI

Read the following passage carefully and then answer the questions set on it:

On May 8th, 1902, a mass of fire swept over Saint Pierre, a town of a population of about 30,000 in Kartinique, an island of the est Indies. The total loss of life was probably

日六月二十年七六九一般公年六十五国民華中 有教僑華

Tershantha ïopulation in the@towni trnas) Dean estimated at 40,(CC people, and most of!

hese perished in less than a minute.

The cause of the Cisasater was the erupción the volcano,ount felée, a mountain near- Deferre, in the north-westers part of the island. It had already causedssone talarm by its behaviour at the end of aprilsand the be- ginning of May, but later it seemed to have become quieter. The sudden eruption and shock were therefore the more, terrible, being unex-7- pected. One ship alone in the harbour escaped the others were destroyed at the same time as the entire town. A voice came from this ship, when it reached St. Lucia, said, "fe came from Hell. You can cable the world that St. Fieris exists no longer.

1) What was the disaster that caused the des

truction of Saint Pierre?

2)

How many people lived at that time in the town? 1) How many peovio do people think now werej

illed?

4)

hat was the name of the mountain wnacnj erupted?

5)

What happened to Saint Fier eruption?

after they

(6) Why were the eruption and shock!terribles

For each of the following Tind a word of similar meaning in the passage:

died

be mountain that gayi erupt spoke,ashes etc.

warning

la send message to,

Translate he following passageɣinto Chinese:

Your request" for eighty dollars I do not

As the think it best to comply with now. various times when I have helped you a little, you have said to me, we can get along very well now, but in a very short time I find yous in the same difficulty again. § How this can Only happen by some defect in your conduct. What that defect is, I think I know. You are: not lazy, and still you are an idler. I doubt whether, since I saw you, you have done a good whole day's work in any one day. You do not very such dislike to work, work and still you do not work much, merely because it does not

soem to you that you could get much for 15. This habit of uselessly wasting me is the goole difficulty, and it is vastly important, to you, and still more so to your children, that you should break this habit. It is more Important to them, because thy have longer to live,

und on keep out of an Idle habit before they are in it, easier than they can get out after they are in it, MI

3. Translate the following into English:

沒有做完,便像有幾千斤重擔子在肩頭,肉 3.為什麽呢因為受那良心要備不過,要逃躲也没货

BRARIES

lkalins reection with litmus.

The salts formed from strong acids end rest bases form salts whose solutions arefaciofe to 11tmus. For example, ferric enlorida solution is acidic to 1 ilmus

Feclg

ONG YON

liquantiw(offironiwire ((about 1.5′′ placed in a combustion tube. Dry chloring through the combustion tube, when sll

tube)has been displaced, the

tod as the chlorine passes over the Į

chemical combinations farela chloride formed

crystals FeB BROWN'S

Weight of oxide. wt, of water formed When the oxide was

1:975 205/

reduced with hydrogen 0.45 gm.

of oxygen ta}

(0.45 (0.1

onloride

Vanhydrous ferr

acids form salts whose solutions are alkalines to Litmus For example, sodium acetate ia

Ikaline to litmus

In anusous solution," the salt is highly dissociated into tona, while a tap 110 only very

slightly dissociated,

CH3COONa

120

Ingre are four"ions in the psolution.. Sodium hydroxide, a strong base, is almost. completely dissociated in solution. but apetia Acid is a very weak acid,* H* ions and 343.00/ iens are therefore removed from the solution to form acetic acid molecules.

CHCOCH

The removal" of the hifions cau?? T

cer molecules to dissociate, and the fr will be repeated. When a state of equilibrium is finally reached, there will be an

"of

DH ions, which cause the solutious oisiva

hydrosilor 1994, 8, BUS

plately associated in solution. Ferric hydroxide is a weak base.re

ons and UH}

ions are removed from the solution, toaformi ferric hydroxide molecules.

30HI— Fo(UH)3

The "removal of OHlons brings abo{wan excess of H fons, When a state of equilibrius is reached, the excess of fl ions will be in as to cause the solution to give en Roldie [reaction with litous

Dalton's Atomic Theory may bersu follows:

Hatter is made up of small particles eilleur atoms, which are indivisible and indie sirg Atoms cannot be created.

particular elementareyall exactly alike in every way, and (are different! from the atoms of all other elevint:

nenfchewice 1 combination takes place between lements, the alums join up in single whole number jtojform new substances injenich they

090 suzir own churücteristic propertief

Conservati

This Law states | thai matter

sree cad norį destroyed shenics1 rezction.

be nei ther course of

Lew offcens Lant: Composition(or Derinizej

roportions)

This law states that all pure samples of the Befchemical compound contain, the same elements) combined together, in the same proportions ba

[111), lawvor multiple Proportions,

Flís, law steten Chat, when two elementa comire together to form more than one compound, several weights of one (element which combing lerent wil with a fired, wel, ht of th besinin alplsäration

Hence

Letal

the oxide"

11.575 89

Thus wt. of metal that 1.575, 8go.

would combine with 8

0.4

of oxygen

31. gs.3

But these

the ratio

[ance these figures illustrate Multiple Proportions.

Fussions for)dext; week 177

Lawlor}

[{1}][State"(a) Gay) LuSono's - Law,{(b) avogadro'

Hypothesis.

Use the hypothesis to show that" for ava"ga seej under the same conditions of temperature: and Pressure, the ratio of their molecular weights)10) erual to the ratio of their densities,

A certain element 1 forme a gaseous oxide 10,1 Toe) density of this oxide is 0.2579 gm. per litrs at a temperature and pressure at which the density per litre, Galculate th or oxygen is 0.2749 un

(2)(a) Calculate the volume or carbon eturave measured at 20°C. and 750 mm, pressure which would be obtained by the action of excess dilute hydrochloric acid on 3.00 of calcium carbonate,

If the carbon cocide so obtained was please through a large quantity of rechos carbon, what gas would be formed, and what would be (its volume measured at 20°C and 750 m

pressure?

60 ere, or air are mixed with 30"changlan axossa of hydrogen and the mixture exploded by spa After cooling, the volume was 48.5 0.0, all volumes being not sured at room temperature amus [preveureu aulate the percentage of úxygen volume in Ersair indicated by this resulta

OXYDƏ A