真二第張六第日一廿月三年西巴夏 WAH KIU YAT PO
文中學會考試題預習
化學科
(廿七)
王錦釗
CHEMISTRY (26)
1. Describe how you would obtain in the laboratory
pura: dry.epecimens of
(n) Lead monoxide: from a maxvurs or lead monoxide
and cupric oxide,
(b) magnesium sulphate crystals from a mis 辽
sodium and magnesium sulphates
(c) nitrous oxide from a moist mixture of nitrque,
and nitric oxides.
2. When. 20 d.d of a
gaseous hydrocarbon were
exploded with 100 c.c. of oxygen- an excess
the volume became 80 c.c. This was,
further
让
reduced to 40 c.c. by shaking with caustic potash,
All the measurements were made at room temperature
and pressure. Deduce the molecular formula of the hydrocarbon.
Indicate briefly how you would prepare it in the laboratory, and describe its reactions with
(a) bromine, (b) potassium permanganate, and
hydrogen
SOLUTIONS
(a) Add an excess of dilute Bulphuric acid to thai
mixture contained in a beaker and stir.
Cupric oxide will react with sulphuric acid to. form a solution of copper sulphate. There is no action between sui churic acid and 1件 monoxide.
Suo. +
12904
CuSO4
+
F20
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深理
本届升中試答案一
+ (x + 1) *2
·
+
H20
1 mol.
(x + )mol.
x mol.
MOL
The mixture is then filtered and the filtrate
is discarded. The filter will contain
insoluble lead monoxide together with impurities such as cupric oxide and copper sulphate..
Remove the solid which is left in the filter to a beaker and again add dilute sulphuric acid and stir. Again filter, su
'and discard the filtrate. Rinse the residue in the filter with distilled water and dry in ar ovene
(b) Boil some water and add the boiling water
alowly to the mixture contained in a beaker.
Stir the solution gently and continue to add
boiling water until the mixture iust completelv dissolves.
The soluoility of magnesium sulphate talls from 74 at 100°C to. 45 at 40°C while the solubility of sodium sulphate (Na2SO4
rises from 43 at 100°C to 48 at 40°C.
Cool the solution down to 40°C. Crystals of magnesium sulphate will settle to the bottom of the beaker. Filter off the mother liquor. Take the crystals in the filter, redissolve in water and recrystallise. The wet crystals are dried with a filter
paper."
(c) rass the mixture of gases through woulffe
bottles containing a concentrated solution of freshly prepared ferrous sulphate. The nitric oxide is absorbed by the ferrous sulphate, while the nitrous oxide passes through.
FeSO4 + NO = FeSO4 NO
The nitrous oxide is dried by passing the wet gas through B-tubes containing fused calcium chloride, and the dry gas is then collected over mercury.
将新
一九六九車中文中學會考試題預裝力
英文科
二十七) ·王淑方。
LESSON TWENTY-SEVEN
7-5-69.
SECTION FIVE
TEST PAPERS
(ENGLISH PAPER il; continued j
When the tire engine arrived the whole street
0
TEST. TWO
1.
For each of the following sentences, choose the best of the alternativės given.
(b)
Rewrite
the sentences, following the
instructions
given in the brackets. Make any alterations or additions that are necessary.
They asked him to do it
(lea 'made' fortasked')
He does not fear your stern appearance (Use afraid' for 'fear!!
(iii) She went to Singapore some days ago.
(Use 'few' for 'some''
(26 They would not let himg.
(iv)
He started to collect stamps as a hobby. (Use 'stopped' for'started")
(P did
(Q) done
(R
do
(S) to do
(T
does
(v)
I want to have another one.
(Use 'like' for 'want')
(27)
Even though they were frightened (P) thev go or
so they went ou
(R) but they went or
and they went
[II
on
Each blank space shows where ONE word
nas
been
T
they went
心你
left out.
Write each missing word against its
品
number in the margin.
#28)
Bearing the news (1)
hus arrival (2).
Friday after-
(2)
(P
on fire
(0)
(R*
furea
(s) caught fire
5
By Avogadro's Hypothesis
(I'
in fire
vol.
v 0.c. (x +
(29) I
my work Last Friday
x.volvol
vc.c.x vc.c.0 (Bance. steam
(P
finish
(Q) finished
(R
can finish
(S) can finished
noony I agreed (3) my sister that it was necessary (4) to find a way (5) pleasure (6) (7)
our surprise, however, my mother was not pleased (8). (9)
(3)
us
(4)
showing our
(5)
his returne
(6)
(7)
US
(8)
showing such an interest
(9)
condenses to water of
(T
an finished
(10)
Me
(10)
1301
His poor health, prevented him
it.
negligible vol. on being cooled to the room température.
on doing
(R)
Contraction in volume
V ++
(x
+
(v + 2 v) c.c..
But contraction fh volume.
(20 +
100-80)0.0..
40 c.c.
+
和
40
Thus 20 +
* 20-
201
'asterification: C2HOH + H2SOC2H30+20
4
(未完轉入第六張第三貞)
• * - 4 i
Volume of U2 formed
But volume of CO2 formed
XV
1.8. 201 - 40
(80
-
40) 0.0.
..x - 2
Hence the molecular formula of the hydrocarbon * CH
Ethylene is prepared by the dehydration of ethyl alcohol by means of excess hot concentrated sulphuric acids
fii "I have written three letters this week.
That was what she told him. (Begin with "She told
"}
(121) My friend is cleveT 4. You are clevera
(Use • just as'}
iv)
The woman is old, Her husband is old. (Use land so')
He walked away. Ile did not wait for an answer. (Use without''
1 (16)(think) 1 must hurry to finish it before the first lesson (17)(begin), although there (18)Čhot seem) to be much hope.of my (19)(succeed). However I (20)(do) my best.
[I.
to doing (T) to
(a) Combine the sentences, following the
instructions given in the brackets Make any alterations that are necessary.
EXAMPLES:
(2) The thief has been caught. He stowaw
the jewels. (Use
The thief who stole the jewels nas betu
caught.
He wandered around the building. He did not know where to go. (Use 'not knowing') He wandered around, the building not .- knowing where to go.
A
(i)
The man works at a factory. His dog ull (Use 'whose').
(0 (S
from doing.
do
(a
Mrs. A.
Write out a suitable form of each of the verbs in brackets against the number given in the,
margin.
Come in. I (1) (reach) (1) home ten minutes ago and I (2) (2) (make) a cup of tea when you rang(3)
the bl]. Now sit down and tell me what you (3) (do) since we last (4) (moet).'
(4)
D
Mrs. B. ~(5)(acet) back ves- terday from a short holiday in Malaysia. If we (6)(not/run)
(5)
(6)
(7)
out of money, we (7)(stay) there longer."
"(8) (vou/have) any Mrs. A. trouble with the car?"
(8)
"No. Mrs. B.
But we (9)(take several spare parts with us in case anything (10) (go) wrong.
'9)
10)
"2
(b)
After I (11) (finish) my examination next June, I
(11)
(12)
(12)(enjoy}'(13)(have) a
(13)
good rest. For the past few months I (14)(work) very hard, Yesterday, for instance, by bed time I still (15)(not/ finish) my homework; so now
(14)
(15)
(16)
(17)
(18)
19) 20)