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日三十月二十年七六九一公年六十五國民中
奇教健華 T
1968
中學會考試題預習專欄
sut one gram molecule of any gas or vapour at
化學科
王錦釗
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Chamiatky: (7)
1. (a) Oxy: Lussan's law of Combining Voluses For
state that when gasea combine they do so in volumes which bear a simple relationship to another and to the volumes of any gaseoua
products (if any), provided all volumes ara
usasured at the same-temperature and pressure.
1968
中學入
試試題預習專欄
英文科(上)
王挺生、
TEST 6
Time allowed : 25 minutes
The vapour density of a the ratio
Unaerine me right words in the brackets,
(a) The thiếf escaped (from, în, to) the prison..
b) Silk-worms feed (to, on, at) leaves.
(c) The king ruled (on, over, for) many milions.
(d) The pupils were supplied(of, at, with) books. (e) It is a pleasure to deal (for, at, with) them.
(f) She quarrelled (for, to, with) her mother yesterday (g) He introduced me (at, to, with) his friend.
(h) Mr, Wong promptly replied (for, in, to) my ierter.
(1) I refreshed myself (with, in, for) a cup of coffee.
(j) jane dived (on, into, at) the sea last night.
2.
Change the following into the negative form
(Mr. Wong was working in his rice-field,
b) They had finished their work in the forest..
(b)
(c) Jane was good at English.
(c)
(d) She waited for the bus at the bus-station.
(d)
(e) You must run to the fire.
(e)
1. Some punctuation is missed out at X. Put the correct.
punctuation mark clearly in the blank or
on the right:
a) "Please, may I have ten dollars for my present X" (a) b) Crack X The bamboo which covered the hole broke, (b) (c) "A boy cannot dig a hole to catch a tiger X"
Tom.
e girl (d)
(d) Far X far away in England there was a little (e) Jane Xs father rode his horse to the little town.
(1) "Oh, what a wonderful story X said Peter..
(g) "Did the man sand Marie a present X asked Jane, (h) Henry X come here.
6) Listen X The old dog is coming!
4. Fill in the dianx in each sentence. Use a word CDDOSITE
meaning to the word underlined.
-Example ~ Please come early, dont be late.
(a) Two girls were absent yesterday, but everyone is
to-day.
b) This knife is blunt; give me a
one.
(c) The hall, which was full of people two hours ago. 16, non
(d) The water in the bay was muddy last Saturday, but it is
very
to-day:
(e) The rope is loose it should be
5. From the following 11st of words, choose the one which best complete the passage and write them in the given spaces.
how many, how how often, which, at what time, what. where.
(6) Avogadro's Hypothesis states that equal volimes
or ell gases contain the same numbers of
Molecules at the same. Laaparatura and DPAAROPA.
or vapour is defined at
Wt. of a 21ven volums of gas or vapour Wt. of the same vol. of hydrogen (under sams
conditions)
Applying Avogadro's Rypothe31/
Vapour Danaity
wt, of 'n molecules or gas or vapour
Wt. of a molecules of hydrogen Wtof i molecule of gaal or vapour
Vt. of 1 molecule of hydrogen
Assuming that hydrogen is diatomic, that is. sach hydrogen.nolecule consists of 2 atomS»
Then Vapour Dengity
Weight of 1 molecule of gas or :: vapour
2 z Weight of 1 atos of hydrogen
But Holecular Weight"
of molecule of gad Or ék a ton of vdrogen
Vapour Density • Molecular Weight
x Molecular Weight Vapour Density x 2
Bence
Molecular weight of gas "A Holecular weight of gas B
Vapour Density of raa
Vapour. Density of gan Vapour. Denalty of an A Vapour Density of gas 9
Vapour density of oxide I 0 Vapour density of Oz Holecular weight of O2
#pplying the formul
0.2579gm. per litre 0.2749. par litra
• 16 x 2 - 32
We have
above
Kolecular 12 of 1/0
0.2749
0.2579
I 32
0:2749
30.02
Molecular ut.
Hence the atomic wh, of & =2-30.02.
- 14.02
-N.T.P. occupies a volume of 22.4 litres.
Thus volume (at N.T.P.) of CO2 that can be obtained
from 100 gms. of CaCO
Volume (at N.T.P.1 of from 5 gre. of CaCO3
22.4 litres
CO2 that can be obtained
22.4 litres. 1.12 litres
Volume that this gas would occupy at 20°C and
760
750 cm. pressure - 1.12 x 150 x 223
CO2 molecule
for n molecules
1.218 litrea.
200
2 molecules On molecules
11tres
273
Applying Avogadro'a Hypothesis, we obtain
1 volume
2 volumes (All volumes being measured at the dams temperatura and pressure.)
When carbon dioxide is passed over red-hot care carbon monoxide is formed.
Volume of CO obtained from v 0.0. oг UÜ2= ZV
. Volums of CO obtained from 17218 litres of co2
• (1,218 x 2) litres - 2.136 litres.
Air may be assumed to be a mixture of oxygen and nitrogen only, When air is exploded with hydrogen, the oxygen in the air will combine with hydrogen to form steam which condenses to water at the roca. temperature. The nitrogen remains uncombined after the mixture of air and hydrogen is exploded.
molecule
or n molecules
volume
2H2
-2 molecules
2 volumes
20 molecules molecules
2n molecules
Applying Avogadro's Hypothesis, we obtain
2 volumes "(which condenses to a liquid of nazlizible volume)
a
That 16, when v c.c. of oxygen are sparked with 27 0.c. of hydrogen, there will be a total contraction of 3P.C.C.
fet volume of oxygen in 60 6.0. 01 air – ▼ 0.9. Total volume of air and hydrogen • (6030) 0.c.
-.90 0.0. (before sparking) volume of gas (after sparking and cooling s
48.5 c.ci Contraction in volVERNO
(90-48.5) 0.62] 41.5.0.0.
«Henes percentage
VIES
IBR
Thús 34
42.5
41-2
oxygen by volume in the afi
102 x 100% 3x60
• 23.1%
CO
16x2
PUBLIC
CaCO3
201
CaCl2
4012
does he come to visit you? Once
$160
week?
Yes. He usually comes on Saturdays,
does he get here? Does be take
the bus?"
"No, he walks.
Weight of Go, that car
of CaCO
ained from 1.00
This is the gran-molecular weight of carbon diorida
låstions for next week (8)
Describe how coal gas is manufactured, Mention three by-products of coal-gas manufacture, and state their
-uðað.
2. Draw labelled diagrams showing the apparatus and
materials used in the preparation and collection of (a) carbon dioxide, using a Kipp!s apparatas. (b) carbon monoxide from carbon dioxide, (a) carbon dioxide from carbon monoxide,
Explain why the overall percentage of carbon dioxide in the air remains approximately constant, and why carbon monoxide acts as a poisonous gas. 3. How, and under what conditions, does carbon react
with (4) oxygen, (b) sulphur, (c) lead monoxide. (d) water?
"That must be very tired in the summer, does he live?"
"In Homantin. It's not very far.
does he usually come on Saturdays?”
*We don't need to go to school on Saturdays, and so we can go to play basket-ball or football in the park.
"Football,
is the better vama?"
The word in the left belongs to the sentence.
Put a mark / to show where it ought to be. Do not maar the first or the last word.
Example:
(2) ALWAYS OF JUST
NEVER
He is tired.. My little brother laughs at me. Tom has finished reading his bour Mary was walking along the street She goes shooping after school, The sun will come out again,
(c) SLOWLY (d) SOMETIMES (e) SOON
Which word does not rhyme with the others? Write it in the margin."";
(a) height. quiet night quite
b) meer seat meat
great greet
(C) key buy cry my high die
good
could
if ber
(C) food" wood should
were
8. Put the words into the right order):
in the space.
(a) desk it the In put.
32000
9. Underline the correct word in the brackets
(a) What (is, are) your name?
b) Either she or he is, are) mistaken.
(c) Bread and butter (is, are) wholesome food.
(d) The pupil like his friend(is, are) punished
(d) None of the windows (is, are) broken.
(f) Every boy and girl is, are) reading in the classroom.
Henry and Jane (is, are) fond of mugsic.
(h) Mr. Chan as well as his friend (is, are) working
(1) Both of you is, are) late.
(Not one of the boys (like, likes, menry.
10. Read the following carefully
gave it to me.
"A letter for you Mother, Bobby said
"Mrs. Les The postman left it at the wrong house.. "You will be glad to hear that I arrived safely a week ago. We had a comfortable tourney and reached the airport quite early:
"My sister mer me with her frieno, MI Green, wno took us into London in her car. My sister likes fiving in London. She lives near the big hospital where she works. Al present she is busy, but I have been to some places on the underground railway and Into the gardens near us.
"Next week my sister has a holiday, and we øre going to all the famous places. I will send Bobby some postcards Underline the right answers
'ite out each sentence
-{[(a) Bobby's other name was
orramous places are places that are
(b) not him give money did father the bay'a any.
(c) could if would you sell,
(d) so I want this letter stamp that can is post. (d)
(e) the de himself work he did?
Lee, White, Brown, Green, London).
big, auterem, safe, old, well known)
(c) Mrs. Brown thougm the journey was (wrong, short,
dangerous, pleasant, busy.).
In the dext two duescons there are several things that MIGHT
BE TRUE.
Underline the one you ARE SURE IS TRUE.
(d) Mrs. Brown's sister liked
(1) going by plane..
(i) visiting famous places,
(111) living in London.
(iv) writing letters.
v) Bobby.
(e) Mrs. Green
(i) sent Bobby some postcards,
(11) worked in a hospital.
(111) had a holiday
(iv) went to the underground railway
(v) went to the airport with her friend.
Answers to TEST 51
1. (a) at, (b) with, (c) in; (d) for (e) at, {f} with, g) for mi
from, 0) to, () to.
2. (a)was, (b) will be, (c) was, (d) was, (e)are, )18, (g) 18,) (h)were (1) am, () is, (k)are, (1) were, (m) 18. in) ar■ (0) was.
3. a) (4) (6) (2) (8) (3) (5) (7)\
4. (1) went) (2) ordered (3) After, (4)for 15) ready. (6) Dring
(7) replied, (8) for, -(9) did (0) it
5. fisherman, mucn why, catch grown caught, DIR better?
keep.1
6. (a) Lb), (c) sne, (d) they, (e) me, them! gire (h),
1, (1) he, (1) he,
May, must, could, will shall,
(a) sold, (b) touch, (c) X. (d) X, (e) bes, '(I) lører (y) bees) (h) X, (1) blood, (1) this
(a) librarian, (b) very often, (c) to return a book, to) were famous, (e) taller than Paul, (f) cìd as they were told, fa)
stories make no noise, (h) whispered, (1) more excrung than Paul, () in the City Hall.
(a) What, (b) Which, (c) whorn (d) Whom, (e) What}{{#i Whom