1970-03-18 — Page 23

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10英文中學會考試題預習專欄

经道英文書院主編

(†)

CHEMISTRY (20)

化學科

QUESTIONS

1. When hydrogen sulphide is burnt in an excess of alf

the major products of combustion ares

A sulphur trioxide and water

B. sulphur and water

C. sulphur dioxide and hydrogen

D. sulphuric acid

E. sulphur dioxide and water

2. When metallic lead is added to dilute sulphuric

acid,

A. hydrogensis evolved

B. sulphur dioxide is evolved

C. the metal completely dissolves to form lead

sulphate p

...

D. there is scarcely any reaction E. it is oxidised to lead dioxide

3. Concentrated hydrochloric acid is used in flame

tests of metallic ions for the following purpose.

A. to assist combustion

B. to clean the platinum wira

C. to make the sample more volatile.

Di to serve as a fluk

F. to impart the colour to the flame.

When 20.0.0. of an equimolecular mixture of

carbon monoxide and methane were-exploded with 30.0.0. of oxyggh, there would be,

I. some oxygen left

II. some methane left

III. an increase in volume

IV. a decrease in volume

V no change in volume.

Which of the following alternatives is correct, if the reaction is carried out at room temperature and ato do pheric pressure?

A. I and IIIN

"B. I, and IV

C. I and V

D. II and III

E. II and V.

5. The phenomenon of two or more identical molecules

uniting together to give a single molecule with unaltered chemical composition is known a8.3.

isomerization

Balletropy.

P. dimerization

Do polymerization

3. catalysin

Which of the following gases has a Gram Kolecular Volume of 22.4 litres at N.T.P..conditions?:

A. carbon dioxide

B. acetylene

C. hydrogen

D. all of the above

none of the above

A detergent is a chemical which

A. is used as a cosmetic

B. in used in fire extinguishers

C. oan rezove permanent hardness from water

D. causes emulsification of oil or grease

particles with water.

retarding action to a chemical reaction gative catalyst)

charcoal may be used to remove colour.

impurition present in orside products. The decoloring action is dus tos

A. bleaching action

B. reduction

C. adsorption

D. neutralisation

E. other chemical reactions

When a jar of gas is ignited, it burns with luminous flame, after the reaction, little line water was added. After shaking, the lime water turns wilky. The gas can bet

A. ammonia.

B. carbon monoxide

3. ethylene

D. hydrogen

E. matkane

water

2826 + 301⁄2 - 2820 + 280,

aulpaur trioxide can only be formed by catalytis oxideties of sulphur dioxide. Hydrogen io too.

strong a reducing agent to remain unreacted during combustion, whereas Bulphur is also oxidised provided there is a sufficient supply of oxygen (air),

There appears to be scarcely any reaction. This is lceruma although lead is above hydrogen in '- the chemical activity series, and should diaplu

hydrogen from dilute acids, the lead soon became coated with a thin but íntact layer di insolable lead sulphate which prevents any further action between the metal and the MO134

When a platinum wire is moistened with concentrates. hydrochloric acid and smeared with a little of and held in a Bunsen flame, certai the ormple, matale volatilise and impart characteristic colours to the flame. Hydrochloric acid is unea in order to form the chloride, as this is usually more volatile than other salts.

B (I & IV)

An equimolecular mixture or gaben zu one containing the same number of molecules of the constituent gases. According to Avogadro's Hypothesis, the 20 c.o. of carbon monoxide ana methane may be regarded as equivalent to 10 0.0. of carbon monoxide and 10 0.0. or methane at the Riven conditione,

200+

2002

∙10

10:

(in:0.01)

202 = CO2+ 28,0

20

(in 0.0.)

total volume of oxygen require, (5 + 20) 0.0. 25 0.0. herefère volume of oxygen ramaining

(30-25) c.o. - 5 0.0. 1.0. I is tru Foluze of carbon dioxide formed

- (10 + 10) c.6. - 20.0.0.

Volume of gases after reaction

(20+ 5) c.c. - 25 c.c ile. IV: la true

The phenomenon is known as polymerization,

3022-066

D

cetylene benzene

Dimerization is limited only to the case. involving two molecules

To a close approximation 1 gran molecule of any gad Dooɛples the same volume under the sa physical conditions.

3:

Host detergents contain the sodium salts of alkyl sulphuric acids, RHSO, alkyl sulphonia acids, R.0.0, and alkyl fryl sulphonic acids R.CH.202ON, where R usually contains ten to aighteen carbon atoms, Detergents have the property of causing oil or grease particles to form emulsions in water, so that they act as cleansing agents. Their great advantage over. ordinary soaps lies in the fact that they form soluble calcium and magnesium salts, and hence is not precipitated by hard water.

The colouring matter, ars removea ny physioál adsorption on the surfaces of the partiales: activated charcoal.

9.0

Common gases that turn lime water milky aze: carbon dioxide and sulphur dioxide. However, che gases listed here contain only carbon. Carbon monoxide and methane burn with a blue flame and

Ethylene, as an olefin gas containing a fairly high carbon content, burne with a luminous fl and is concluded to be the gas,

hence are eliminated from being the

poten

302 - 200

210

According to the Loury concept, acidity in aqueous solutions is due to the presence of hydrogen ions, formed by a process of reversible. ionisation, thus:

HCL + CL

日八十月三年〇七九一曆公年九十五國民華中

「一名獎項中文中學會考試題預習專欄

英文科

LESSON TWENTY

SECTION: THREE

ENGLISH LANGUAGE

COMPREHENSION (Continued).

EXERCISE 28

(J=)

王淑方

[18-3-1970.1-

Read the following passage caretully and then answer the questions that follows

Fingers were made before Torks. We rarely hear this saying except when some child gives up the struggle. For nicety and dives into his food with his fingers at pur forbears did up to the seventeenth century.

A fork is an ancient thing, one of first tools man ever had, yet no one thought of eating meat with one for many centuries. The ancient Egyptians had big Hooden forks which they put to agricultural uses, and since very ancient days people everywhere have used pitchforks, hayforks, and digging forks; there were too in common use fish forks - used for spearing but not for, eating fish. There are also records of a vicious weapon called a fork which had tines provided with barbed hooks, and ugly indeed must have been the wounds inflicted by it.

The idea of eating with a fork came into Europe from the East some two centuries before the first record of any table. fork in England, this being a fork made of crystal which belonged to Edward I in the late thirteenth century. The metal forks with glass handles possessed by Henry VIII were employed only to pick up the strange sticky Indian preserves called ginger, as also were the forks of Queen Elizabeth with their ornately carved ivory handles.

The custom of eating meat with a fork was wide spread in Italy by the fifteenth century, The English explanation for this affected mannerism was that the Italians were averse to having their food touched with fingers seeing all men's fingers are not alike clean', Anyone who used a fork to eat was well ridiculed in England for another hundred years and pronounced effe- minate or overnice. Finicky people, however, graduallv adopted the custom and braved the ridicule of their fellows, and by the late seventeenth century learning to handle a fork was an essential part of every genteel young person's training. By the end of the century, the use of forks was prevalent.

anted from THE SOUP STONE(Leach)

For each of the following find

meaning IN THE PASSAGE:

evil

Saused or imposed...

ancestors

pronge

fruit, etc. which

has been preserved

of similar

richly adorne ornamented tro much

necessary elegant, well... bred

(1 general expera,

enced

What did the ancient Egyptians use forka for?

4

3) Name three kinds of forks used in ancient days.

Explain in what sense 'ugly' 'is applied to wounds

@ Î õu DUN

in line 14.

Give the meaning of 'record as used in line 17. State when and from where did the idea of eating with a fork come into Europe.

In what use were the metal forks employed in Henry VIII's days?

Why was the custom of eating meat with a fork. widespread in Italy by the fifteenth century?

SECTION FOUR

TRANSLATION

EXERCISE 29

Translate the following passage into Chinese.

The orange is a very common fruit and in my opinion the best. It has a delightful, sweet taste which I am very fond of. It is good for the health. It is safe to eat because it is peeled before it is: eaten. It

is round, and young children can use it for a ball and can flick the pips at their enemies. More over, its honesty appeals to all of us. If it is going to be bad for the best of us are bad sometimes

it begins to be bad from the outside. On the other hand the pear often looks fresh but is rotten inside. But the orange has no hidden faults. Ita outside is a mir- ror of its inside. If you are quick you can stop the shop-keeper before he slips a rotten one into your bag.

An addd in any substance that

4. contains hydrogen

B. contains oxygen

C. comïmins hydrogen replaceable by all setals

• asta as a proton donor in reactionr

• provides one aton of repizosabðla bvárosaN DAY molsozle

SOLUTIONS

When hydrogen sulphide is burat in an excess of tha gan iz oxidised to sulphur dioxide and.

In actual fact, the naked proton H can only exist momentarily, and is invariably associated: with solvent molecules, and for instance may be represented as followB

B* + H20 • H30*

820 + H¢1 - H‚0* C1

An gold is therefore defined as a Proton-Donor.

NEXT WEEK

More exercises in multiple choios objective testa.

EXERCISE 30

Translate the following passage into Chinese:

On a splendid September day, I left my native land. After a very interesting journey I arrived in London. I was amazed at the difference between my small village and the huge city. What traffic! What an uproar in the streets! At first the norse nearly deafened me, but after an hour or so I became used to it. Everything was new and strange and I must confess that my first impress- ions were not very favourable. When I arrived at the hotel which had been chosen for me by a friend. I felt very tired. I had seen a great deal in one day, and I felt in need of rest in mind and body that evening.