CITY
HALLY
WAR KIU: `YAT
四
8五十月三年七六九一慶公年六十五圈氏金甲
中學入學試試題預習專欄
8. Change the following sentences into questions.
(a) She can speak English, (a)
英文科
(+)
王挺生
(b) The pupil was punished by the (b)
化墨科 (二十)
英文中學會考試題預習專欄
王錦釗。
**
teacher.
CHEMISTRY (20)
TEST 19
Time allowed 1 25 minutes.
Choose the correct word from the list on the
left and put it after the word on the right.
Example1 Bus ticket
1. swimming
past.
Dante
ticket
2. fore.
record
3. Dolice
report
4.7 tooth
alarm
pool
J.
pul I
office
Station
5. fire
2. Look at the example and fill in the blank.
This is my book..
Example:
It is mine.
Jane and
Henry did
at the table.
with
To had no work
balls. Suddenly,
book on the floor.
To aw.
nomework...
He played Jane dropped
Tom picked
it up and asked
"Whose pencil is this? Is it
Henry?"
"No. it 19
(c) They were playing football in the field. (4)
(d) He was born in 1906.
(a)
(e) You nad raṇisned your, work.
(e),
1. Some punctuation is missed out at
Put the correct punctuation mark clearly in the
blank.
"Look at that cloud
" he said.
"Now we shall have a storm, all the plants will be spoilt and we shall have nothing to eat
and all the animals will die
unlucky we are.
>
Bow
10. Put the following words into the right order..
Write out each sentence again,
(a) night I Taipo went last t
(a)
(b) the on put pot a My fire servant (b)
(c) Jane cook to helped him
(0)
(d) at door the Someone knocking is
(a)
*F Jane said.
(e) bid
Cou
not to
(e)
the
3. Underline the correct word in brackets :
a) Shall 1 (brought, bring you a cup of tea? (b) Look! The nouse (19, was) burning. (c) I (met, meet) her when she was snopping. (d) Many years ago. ne (18, was) very weak. fe) He and his brother (has, have) all the work
4. Fill in each blank with a suitable word.
(a) I thanked der
(b) This one is equal
(c) He killed the lion
(a) Don't worry
(e) Butter is good
{f} She was talking
(2) The baby feeds
(h) The box is full
) The beggar was asking
(1) They were
(6)
her kindness.
that.
gurn
your work.
your health,
him.
milk.
gold.
need of neip..
Iood.
Met answers to the questions.
Is he a teacher?
are you going to schoo17
(c) were they absent yesterday?
(d) is he a good boy?
(e) Is it very funny?
12. Read this cerefully
(a) No
(h) Yes,
(e) No.
(d) Yes,
(e) Yes,
Long ago there a opring in the
mountains.
A stream of water from the spring flowed down the mountain side into a deep valley It flowed along the valley. in and out the rocks, until it came to the end of the valley,
end of the valley there was a h
At the
mountain
When the little stream came to the foot of the
mountain it wanted to pase.
HONG KON
Change the following sentences to the plural.
Frite each sentence again,
(a) I can run as fast as the policeman.
(b) as the knife been used?
(c) He gave good advice.
(d) This book was cheap.
(b)
(c)
Put a word in each blank.
The word you write
must be the correct form of the word on the left!
FAT
He is the
boys in the class.
of all
the
said in a loud, angry voices
"You cannot pass me,
go past me,
But the mountain
(Q.1(a)(1)When some powdered rhombic sulphur is heated
gently in a test-tube it first melts to an amber- coloured mobile liquid at 115°C
(TI)As the heating is continued, the colour of the liquid becomes brown, and the liquid gradually becomes very viscous. At 160°C.,the liquio sulphur becomes so viscous that it cannot be noured out of the test-tube.
(111)On further heating, the liquid darkens & be- comes almost black in colour. It also be tome s mobile again, but it never auite regains ita former mobility.
(iv)Finally at 444°C., the molten sulphur boils, and
a pale, vellow vapour is given off,
Q.1(b)An element which exists in more than one fora wieng.
different physical· properties, but with the same chemical properties is said to exhibit allotropy, and the different forms are called allotropes .or allotropic forms of the element. For example,sulprive and carbon are two elements which exhibit allotropy.
Q.1(c)Preparation of two crystalline allotropes of sulphur
1) Rhombic sulphur
Put some powdered roll sulphur in a beaker,ado carbon disulphide and stir. When all the sulphur has dissolved, filter and collect the solution in a large watch glass. Cover the solution with another watch glass and put it in a cupboard away from draughts. In this way, the carbon disulphide evaporates slowly, and large crystals of rhombic sulphur will be obtained in the watch glass.
11) Monaclinic sulphur
Fill a crucible with powdered sulphur and heat it very gently until all the sulphur just melts. The molten sulphur is then allowed to coal until a crust is seen to form on the surface. Two holes are immediately pieced in the crust with a nail, and any molten liquid is then poured away, Needle-shaped crystals will be found beneath the crust and on the sides of the crucible. These are crystals of monoclinic or prismatic sulphur.
Preparation of a non-crystalline Allotrope of sulphur. Put some powder sulphur in a test-tube and heat it gently until it first melts to a mobile liquid,then becomes very viscous, and finally becomes mobile
gain. The colour of the liquid is dark-brown, almost black. Pour the liquid sulphur into a beaker of cold
ater. A brown translucent non-crystalline mass, which feels like rubber is formed. This form of sulphur is known as blastic sulphur."
If plastic sulphur is allowed to stand in a glass and exposed to the air for a few day
lowl revert back to the rhombic form.
Colour of the precipitate when hydrogen sulphide is passed the aqueous solution
Pale yellow
(1)Sulphur dioxide ii)Copper sulphate iii)Lead nitrate
vizine aulphate
CIRPARIES
I shall never let
The little stream was too frightened
tried to hide under the rocks,
it could not hide because was growing bigger. At first it made a anal pol but little by little this pool became a lake.
A small lake to begin with, but in the end it was a large, important lake. Fish swan about in its deep watere, enips sailed on its surface, and ports
were built on its shores.
As the lake grew bigger and bigger its waters crept slowly up the mountain side. And now ite waves beat holdly against the mountain. until, at last, it found a way out of the valley and went I looding down, a great river, to the
Bea.
(6) NEAT
She copied out the letter
(c) SAVE
Will you put this in a
placer
(0) HEAT
It is a
day to-day).
Under
'to see
(e) SURPRISE He was
me there.
In each space write the LETTER of the word which,
should go in the blank.
(a) Jane is happy (
anor, D. but (b) He ran away (
a. before,
(c) You must go now
a. while, b
7 Henry is sad.
and..
) he should he caught.
for,
c. lest.
(d) Please tell them (
when,
a. that, d. when,
I shall punish you.j
c. and
(e) Please wait (*) he
a. since
when
I shall come,
c. while.
comes back,
till.
the correct answers
Why could not the little stream get out of the
valley?
because the stream flowed along the valley.
because at the end of the valley there was
a huge mountain.
because the stream flowed in and out the
rocks.
2. Why did the stream try" to hide under the rocka?
because the stream was growing bigger and
bigger.
because the stream was too frightened, to
answen!
because the stream could not pass the
-mountain.
<未完轉入第五張第四頁)
Black
Black
white
to the given
e)Pour a little hydrochloric acid on
substance in a test-tube, and heat gently. A gas will be evolved. Pass the gas into a dilute solution of potassium dichromate acidified with dilute sulphuric acid. If the dichromate is turned to s clear green solution, the gas given off is sulphu dioxide and the given substance is a sulphite.
502HH2SO, H2O 502
"
If the dichromate tums a turbid green, the gas given off is hydrogen sulphide, the turbidity being due to suspension of sulphur. and the substance is a sulphide.
༣-- + 24 = H2S
Q.2(a)Preparation of sulphur dioxide by oxidation:
S
+ 02 Sulphur oxygen
Q
502 Sulphur
dioxids
(b)Preparation of sulphur dioxide by reduction
HEAT
ZH250 Concentrated
+ Cu
Dusqu SU2+ 2H2O Copper sulphur water sulphuric copper sulphate dioxide
acid
+
cirrevaration of sulphur dioxide by double decompositiea
heated
Na2803 + 2HC1
pothy 2NAC1
Sodium sulphits
hydrochloric
Acid
sodium chloride
502 + sulphur dioxide
H30
water
QUESTIONS FOR NEXT WESEK
[1. Give a brief and simple account of the industrial pre- paration of sulphuric acid from sulphur dioxide by the contact process
[2. Describe the preparation or crystals or two different
salts from sulphuric acid and sodium hydroxide. 4.88 g. of barium chloride crystals (BaC12-2h20) were dissolved in water. To the solution was added 200 c.c. of a normal solution of sodium carbonate and the preci pitate formed filtered, carefully washed and dried, Calculate (a) the weight of solid obtained, and (b) the volume of N/2 hydrochloric acid which would be required to react with the excess of sodium carbonate in the filtrar's
3. Describe une reactions of sulphuric acid with (1) iron, (1) sodium nitrate, (iii) crystalline copper sulphate, giving the relevant equations and indicating in each case the appropriate temperature and concentration of acid.