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2.
文中學會考試題預習
化學科
(廿八)
王錦釗
CHEMISTRY (28).
If you wera given powdered samples of sodium carbonate, sodium bicarbonate and zinc carbonate
which of the following teste would you perform
so that you could identify all three?
•A
Examine the colour of the samples
B Add each to water and observa the solubilities
C. Add dilute hydrochloric acid to each.
Add ammonium hydroxide to aach
E Heat the three: powders with a bunton burner
colourless solution "A" turna brown when
chlorine is bubbled into it, "A" probably contain$
ferrous chloride
B litmus
C
nitric acid
D
E
zinc nitrate
potassium bromide
3. A mixture of barium chloride solution and
acid is added in turn to tan t-tubas
hydrochloric ar
containing
T dilute sulphuric acid II dilute sulphurous acid. III sodium sulphate solution IV
sodium sulphite solution
...
In which of the test-tubes will a beavy white precipitate form?
AI and II only
B I and III only
C
II and IV only
·D
III and IV only
EI, II, III and IV
三期星26日一廿月五年九六九一曆公年八十五國民蕺中育教僑繭
Which of the following. AI only
termatives: are correct?
B
II and III only
III and IV only
INIMII, IV and V only
All five statements,
molar solution contains:
one gram-mole of solute in 1000 0.0, of water
one gram-mole of solute in 1000 gm. of water"
one gram-mole of solute in 1000 o.o. of solution ̈
one gram-mole of solute in 1000 gm of
one gram-mole of solute in 1000 a.b. of solvent
10. The residue after heating some lead carbonate is
dissolved in a little nitric acid. When sodium-
chloride ze added to this solution,
a white precipitate 18. formad which does not dissolve on boiling
a white precipitate is formed which dissolven in excess sodium chloride solution to form a colourless solution
a walte precipitate 18 formed which dissolves on boiling
a coloured precipitate of sodium nitrate is formed
thara is apparently no reaction unlese the solution is heated, in which case a white precipitate is formed'
Solutions
E When sodium carbonate is heated, there is no
chemical reaction. When sodium bicarbonate is heated, it decomposes giving off carbon dioxidi which turns line watar milky. The residue is
anydrous Bodium carbonate.
When sino
Co
hested, it slep
decomposce giving off, esruoa dice. The residue is zinc oxide, which is yallow: wuJN hot, and turns white when cold
ZnCO,
Ferrous chloride and litmus are coloured solutions, Chlorine does not react with nitric acid of zinc nitrate. Chlorine displaces bromine from a solution of potassium bromide, the fres bromine colouring the solution brown,
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數算分析如,內批法,一英文中學正桢及分校,
英文科
学生考試題預
(二十九)
王淑方
LESSON TWENTY÷NINE]
SECTION FIVE
TEST PAPERS
ANSWERS TO TEST TWO: (ENGLISH PAPER
(2) (A)
(6) (R):
(3) (A) (7) (Q) (119) (E)
(1) (E)
(5) (B)
(4). (B) (8) (P)
(9) (r)
̈(10)
(12) (C)
(13) (D)
(14) (B)
(15)(A)
(16) (R)
(17). (T)
(18) (s)
(19) (5)
(20) (P)
(21)(A).
(22) (c)
(23) (D)
(24) (E)
(25) (C)
(26) (R)
(27) (T)
(28) (P),
(29). (Q)
(30) (0)
H (1) The man whose dog bit me works at a factoryj (a) (11) She told him that she bad written three
letters that week..
(iii) My friend is just as clever as you are. (iv) The woman is old and so is her husband. (v). He walked away without waiting for an answer?
M. (b) (i)
They made him do it.
(1)) He is not afraid of your stern appearance (ii) She went to Singapore few days ago. (iv) He stopped the hobby of collecting stamps.
I would like to have another one..
(^).
11. (1) on
(5) of
(9) at
IV.
(2) on (#) on
(3) with (7) f To
(4) for
(8) with
(10) in.
4. The element 'X' has an atomic number of 20. Use your knowledge of the periodic table to predict which of the following compounds !X! 18 mogt likely to form
24.
[Br]
¿ [Mg] 2+ -[x]2-
5. An unknown organic compound was treated with, cold
dilute potassium permanganate solution and wa found to decolourise it. The compound also decolourised bromine water. Which of the following groups did the compound contain?”
6. Which of the following reactions doas not produce
carbon monoxide (heated if necessary)?
A Formic acid and concentrated sulphuric acid
B Oxalic acid end concentrated sulphur acid
C Sodium formate and concentrated sulphuric acid
D Sugar and concentrated sulphuric acid
Carbon and carbon dioxide
E
7. Which of the following conversions occurs in sne
manufacture of polythene?.
-CH=CH
CH,OH
C CH CH
E
CH, CH
COOH
CH= CH
8. The following are the characteristics of
oatalyst:
3. B
C12
2KBr F
2E01
Br 2
Barium chloride solation gives a heavy white precipitate with dilute sulphuric acid and solutions of sulphates. The precipitate iš barium sulphate. BaSO which is insoluble in nydrochloric acid,
BaCl2
or Ba
SO
42
B2SO
Baso
2801
The element 'I' whose atomic number la 20, must have
The following electronic arrangemanti
2
88
'X' is therefore a metal capable of
its 2 electrons in its outermost ele
shall to a non-metal, thereby becoming a positively charged 10n. I'
D An organic compound which will decolourise
potassium permanganate solution and romane water is ethylene CH
H
H
6. D In the laboratory, carbon monoxide as prepared by the dehydrating action of concentrated sulphuric acid on formic acid, oxalic acid and sodium formate. When carbon dioxide 1 B passed over red hot coke. it as reduced to carbon monoxide.
C
200
When concentrated sulphuric acid dehydrates sugar, carbon 18 left
11820 122211
cane sugar
120
removed
by conc. H2SO
.C Polythene is obtained by the polymerisation of
ethylene.
nC2H
.8. B
(C)
A catalyst often changes physically during chemical reaction.
A catalyst cannot increase the weight of the product formed.
a catalyst cannot start a chemical reauvaya which cannot take place without the catalyst.
A molar solution is one which contains one
of solution, gran-mole of solute in 1000 .c.
..
3 It remaine unchanged (even physically) during
a chemical reaction'
9. C
II It is unchanged in weight at the end of a
chemical reaction
10. C
РЪСОЗ
- Pbo
III It may accelerate or retard the rate of a
chemical reaction
РЪО
IV It increases the weight of the product formed.
V It starts a chemical reaction which cannot
take place without the catalyst...
Pb(NO3)2
2Na01
Pb(NO3)2
2Naño,
20 PbCl
Lead chloride is insoluble in cold water, bat will dissolve od boiling.
reached (2) was (3) have been doing (6) were not running (8) Did you have
(10) went
11 enjoy.
(12) will
(14) have worked
(16) think
(11)
(18) does not seem
(20) will do
(a) (1) a (2)
(b) (4) some.
making.
(4) met
Ł
(5)
7) would stay
(9) had taken,
have finished
(c) (5) some (6) any
(d) (7) The
(f) (9) an
(a) "It's a lovely day,
Yes, it is."
(13) having
(15) had not finisneo. (17) begins
(19) success
(3) the,
(e) (8) x (g) (10)
isn't
(b) "You won't forget to put some wood on the
five before you go out, will you?" (c) "They liked it, didn't they?"
"Yes, they did.".
(a) If he hadn't had an accident, John might
have been wonderful pianist, isn't he? (e) "You want to ask my permission to go to
the cinema, don't you?". "Yes, I do."
TEST TWO: ( ENGLISH PAPER III, continued);
SECTION. B
Translate the following passages into Chinese: (a) On the night of the flood four of us drove across the river away from home to see what damage had Deen done.
We drove around on the other side for about! an hour and a half. We finally decided to start home. We came back to the bridge. There was about three
feet of water over the road. We had to get across for classes the next day, so we had to find some way] to cross to the other side. After considerable debate we decided to drive across. We had gone about a fourth.
The car stalled of the way and the ignition got wet.
in about two feet of water. The water started pouring in under the doors. The heat of the engine dried the ignition, and the car started again. We went about half way and stalled again. This time we were in about. three feet of water. The water poured in. We talked about pushing the car across. The three boys got out and pushed. I steered. The water was deep, and so they. could not push the car. They got back in. I thought
It was very -mat maybe the water would get deeper.
exciting. The water was swift. Finally a large truck came in behind us. He pushed us across. We still
could not start the car, and so we had to leave it.]
We came back ́the next The water was still rising. day. The car was still there and the water had not come to it again.
·(b).
Salt
A series of improvements in manufacturing, distributing, and marketing turned the craft of pottery making into a highly ramified modern industry. provided the first improvement. Cast into the furnace
when the earthenware glowed red hot, it fused to form a colorless glaze. A hundred years later, Enoch Booth improved glazes with a method of double
firing which permitted the use of colors.