(1) Undergoes no chemical changs on heating
Name of gait
sodium chloride.: anhydrous godium carbonate
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中学入学試題預習
英文科 廿四)
劉士俊
Put a tick (...) against the word which best completes the meaning of the passage 1
with
dänft, think
(b) Ek was weak to
Arithmet,
(0) They have been kera by
three e!
to
book is similar at
CHEMISTRY (23)
From the following list of garesi hydrogen, nitrous oxide, carbon dioxize, nitrogen
dioxide, hydrogen sulphide, oarbon monoxide, nitrogen, names (1) those which brun in air, (ii) those which dissolve appreciably in water. (111) those which form an acidic solution, (iv) two colourless neutral gases,
(b) Name: (1) a metal which reacte readily with
cold water, (ii) an oxide soluble both in
dilute sulphurto acid and caustic soda solution, (iii) a neutral oxide, (iv) an acid that bleaches.
(o) In the following list of maltes potassium
ohlorate, ammonium nitrate, ferrous sulphate, sodium chloride, ammonium carbonate, lead aitrate, anhydrous aodium carbonate, which salta (1) undergo no chemical change (ii) leav a coloured residue after heating, (iii) leave no solid residue after heating?
Explain the following
where possible?
mẽ, giving equations
(a) When plaster of Paris is moistened with water,
it sets to a hard masaj
(b) An orange layer is formed at the bottom of the
test-tube if chlorine-water and carbon.. tetrachloride are added to a solution of potassium bromide and the mixture shaken and then left to settlaj
(a) Wher red lead is heated, colourless gas is
given off and an orange-red liquid is left which sets to a yellow solid on cooling: (d) When sodium hydroxide
addad slowly
to zinc sulphate white precipitate
is first formed and then disappears; (e) On heating ferrous sulphate solution with
nitrio abid in the presence of dilute sulphuric acid, the solution changes colour and a browm gas is given off.
(a) Please excuse
by: in
absence,
SOLUTION
(a)
Ar) Most girls are afraid of
the dark.
for
to
one
(5) The man set the house at
fir
th
Property
(1) Burns in air
(ii) Dissolves
appreciably in water"
(11) Forms an acidio
solution:
(iv) Is colourless and
deutral
Jane
she will dry
with
on
(b)
Name of gas
hydrogen, hydrogen sulphide, carbon monoxi nitrogen dioxide
carbon dioxide, nitrogen dioxide, hydrogen sulphide
carbon monoxide, nitrogen
(11) Leaves a coloured
residue after heating
(iii) Leaves no solid residue
after heating
ferrous sul parvo - tead nitrate
ammonium nitrate, ammonium carbonate
(a) When plaster or raris moistened with water,
it sets to a hard mass. The setting of planter of Paris is caused by the formation of interlocking orystals of gypsums
(CaSO4)2= #20 34,0 - 20a30 -25,0
plaster of
Paris
gypsum
When it aets, it expands at the same time in such a way as to fill a mould very completely, and so produce, a fine impression. Heat is produced at the same time.
b) The chlorine first displacea bromine, from
potassium bromide.
2KBP
2K01
fue promine 18 uzvraused by the carbon tetrachloride which is thus coloured orange. The orange-coloured mass of carbon tetrachlos ride then settles to the bottom of the test- tube, since carbon tetrachloride: is
is a liquid. much denser than water.
(c) When red lead is heated, it decomposen giving
oxygen, which is a colourless gas.
2P0304
67b0+
The residua, Lead monoxide, which is- sn. orange-red liquid, when hot, solidifies to yellow solid on cooling..
(d) When sodium hydroxide solution is first added
to zinc sulphate solution, a gelatinous white precipitate of zinc hydroxide is formed.
2NaOH + Zn50 _Zn(OH), V
Zinc hydroxide is amphoteric. Hence on edding an excess of sodium hydroxide solution, the white precipitate disappears, becausS soluble sodium zincate is forzed,
Zn(05)2
2NaOH
Nitric acid oxidise ferrous sulphate solution (pale green in colour) to ferrio, sulphate (yellow solution) 6F630
JE, SO + 2KNO. • 378, (80 04/3
ferric sulphate
2007 4,0
Eth
Is he angry about
to for
Janet
into for
(1) She was looking with
to drink.
to
Property
(1) A metal which reacta
readily with cold water, (ii) An oxide goluble both in
dilute aulphuric acid, and caustic soda solution (iii) A neutral oxide
(iv) An acid that bleaches.
Name of Substance
godium
zine oxide,
{nitrous oxide
hypochlorous-aoid
The nitric oxide rises up through the solution
as it 18 heated, and when it comes into contact with air, it turne, brow
2NO
2N02
brówn gas
on
Put a tick against the word or group of words
Rich best completes the manaing of the sentence.
shall see
see
(a) I saw
have agen
had seen
not
him laat week.
an zeeting
(b) I had met
have met
[him as he was walking hone;
WAS BULL is going
(c)He went
goes would
to leave Hong Kong nezE TOOK
18 playing played
(d) While ne was playing
has played
had played
his watch.
ahone shines
{e} The sun was shining.
had shone
** shining
in flying
(f) He was flying
Will fly had flied
flied
football, he lost
Fill come( Came
(1) He come
сале
has come finished.
could taste can taste
We shall taste would taste.
⠀ tasted⠀
as soon as his work is
with our
tongue.
Fill in each blank with 'a' 'an* or *thela
on 18
Iron
She was
Mary is
metal.
to do so.
untidy girl
king of beasts.
best policy.
Lion in Honesty la
earth is round
John is not
honourable man.
Pill in each blank with 'can', may1 (must1: or fought'
Ve
You
You
(a) He
You
when she went. out..
(r) You (6) I
zo London next week
had known. -
her for a long sine
(5) I have known
know
an knowing
led. leat
(h). The boys are leading
the cows to the
Leads kad led kriver every day,
to obey our parents. finish the work.
go now if you like. work hard.
come in time.
pay the bill. to go now.
Read the following passage carefully i
One Saturday evening Mr. Smith planned so go out for dinner with bis family. Unfortunately it rained hard at around seven olalack, as they had to dine at home instead. Night came Tom read his story book in his n usual corner of the room while his sister. Mary was playing with her cat, Molly. Their father was reading newspapers and, and their mother was knitting. Everybody was busy at something. The room was very quiet, a
Suddenly, Molly stopped playing with Mary and ran quickly to the door. She moved Loudly at the door as if somebody were calling her outside. Hary ran after her and wanted to take her back to the seat. But to her surprise,
Holly refused to be carried by her. This made Mary angry. She wondered why Holly neved so fiercely. Then she opened the door and peeped
outside. Before she could see anything clearlyy she found her lovely cat was fighting with a s strong black cat. Fearing that her cat would get hurt, Mary at once called her parents for help. when they came to the door, it was too late. Molly had already disappeared because she had gone to chase the black cat............
Bach of the following statements is about the passage. Put a tick (v) against the group of words which gives the best meaning. Sal
(a) Mr. Smith did not go out for dinner with his
family because
1. it was quite dark
2. it rained hard at around
3. he was very busy.
4. he felt unhappy..
(b) The room was very quiet because
1. nobody was there.
2, all went to bed.
3. all went out.
4. everyone was busy at something.
(c) Molly ran quickly to the door because there
1. a nlind beggar.
2. a strong black cat,
3. a barking dog.
4. a little mouse.
(d) Mary was angry becaUSE
1. she could not go out.
2. Molly ran away.
3. she could not play.
4. Molly refused to be carried by her,
Mary called for help because
1
she feared Molly would get hurt.
2. she was bitten by the black cat,
3. she did not know what to do.
4. she wanted to catch Molly.
Answers to Test 23
(a) easily, (b) carefully, (c) hurriedly,
(a) Suddenly, (e) confortably, (d) is made,
had won; (b) lays, (c) feel,
travelled, (f) must finish, will finish, (g) will make, (h) shall feel, (1) bought, at, in, In, of, to, into, of, to, along, of (a) How much, (b) Neither did I, (c) He is there, (d) Send for the doctor. (e) at least. The giant said, "I can make myself into a lion, "I do not think you can, "said the cat.
"I can and I will!" said the giant
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