要八十月二十年日為胶灵
華僑教育
WAN KIU TATT9- ■* |-
●九六六年度
#九十月一年六六九一屉公年五十五團氏葫
BEBE,
舊中会題 試題預習專拥
化學科
王錦釗、
·九六六年)
試題 預習專欄
(B) (1) To demonstrate the fact that carbon dioxide is heavleri
than air, we lower three candles connected one above the other into a gas jar. When the candles are lit and carbon dioxide from a kipp generator is then passed into the jar, the candles will go out one by one as the gas rises, in the jar.
ICHEMISTRYEK KI
英文科
(三)
方問陶•
TEST 3.
[x] FrainTinteriærdal rawatiwatarul:]ama(star)|
(1) To remove temporary hardness only from river water, we bo11
the water until all the dissolved bicarbonates of calcium and magnesium are precipitated as insoluble carbonates.
Ca}(HCO3)2 ≤ C&CO2 [[CO2]+82 0
CO2 from Kipp generator.
Pas 233cmsä÷1725 minutamı
1. Give one word for each of the following. I write"the"void in
the space on the right.
(s) The part of the body joining the head and
the body.
(b) The first seal of the day.
(e) The side of the road for passengers
to walk.
d) A car which is used for carrying
sick people..
(a) N
(b) ̃B*
*
(0) P
(e) A book from which we can find the →→
meanings of words.
. Fill in the blank with the correct tense of the given verb
(&) She
in London last year, (live
(b) Jane always
(c) Henry
(a) Now the pupil.
(e) The weather
her father. (help!
a book every week. (read hande. (wash)
tomorrow. (change)
3. Put a word in each blánk. The word you write quet ne made from
the word on the LEFT. Think carefully what it should be.
(a) agree
They made an
(b) belie
She does not
(o) blind
His
(2) add
(e) beauty
with her.
him.
1a. the result of an acident.
He met some friend and other people in
In autumn the hill looks In autumn
Underlipe the word which is the opposite of the word oriḥtsä in capital letters.
[11] To remove all the hardness from river water, we can use a base-exchange method. Substances called acolites (sodium aluminium allicates) remove calcium and magnesium from the water and substitute sodium, Permut it which is a commercial zeolite is made artificially
Sodium aluminium y calcium
allicate
+ or ..
maomanfum)
asita
Calcium)
aluminium silicate magnesium + sodium salta.
111) To obtain water "pure enough for chemical analysis from river
we All the water.
Q.2. (a) Put a little chalk and annydrous Boalum carbonate into two separate test-tubes containing water and shake thoroughly, The anhydrous sodium carbonate will dissolve and give a clear solution, whereas the chalk does not dissolve and remains as a white susrenstür in the water.
(b) make solutions of washing soda and baking soda in two separate test-tube and add magnesium sulphate solution to each test- tube.
A heavy white precipitate of magnesium carbonate will be formed in the test tube containing washing soda solution. while the teat-tube containing baking soda solution shows no apparent chemical change,
• Nag CO2£+ Mg 50, 5* - Mg CO2 -+ Na, SO2
2Na HCO2 Mg 50 Mg (HCO2), + No. 30.
e) Put a little or each substance into two separate test-tubes
and add dilute hydrochloric acid to each. Both substances will dissolve in the acid to dorm a clear solution, bút carbon dioxide (which will tum lime water milky) will be given off from the test-tube containing sodium carbonate. monohydrate, whereas no gas la evolved from the test-tube containing slaked lime.
way HHU Nau
(ii) (a) The above experiment also" illustrates a chemical
property of carbon dioxide, viz. the gas does not support combustion.
(b) Carbon dioxide is an acidic oxide and will react
with bases to form salts. When the gas is passed into line water, a white precipitate of insoluble elcium carbonate is first formedr
CO2+ Ca(OH), CaCO3 + H2 0
The solution becomes clear on passing more carbon dioxide through. as soluble calcium, bicarbonate is then formed.
Ho 0 = -Ga (HCD]
.ca Cot +.002
(c) when carbon dioxide passed over red-hot carbon, the
carbon reduces the gas to carbon monoxide.
200,
(a) GOOD
nica, old, wrong, evil.
(3) WET
hat, bold, dry, clean.
(c) SAD
merry, SOFTorful, fast, down-hearted.
(d) SHARI
(e) LARGE
pointed, blant, triangular, smooth.
tiny, biz. strong, huze «
One of the words in each group of words has the same sound As the letter (a) underlined. Write the word in the blank
if, soft, give, knif
(a) arrive
(b) ne
now, knew, need, not
(c) after (d) bed
one none, not, room
has, meet, bit, fed
bad, old, cook, boat
(a) (b)
(a)
a book.
book
5 P111 in the blanks with either has or havSI
(a) Each of the girls
(b) Every boys
(o) These children
(d) She and her mother
(e) Be will
an 100-cream cone
no toys to play with.
arrived.
kaya new pan for a present..
F111 in the blanks with the suitable words from the brackete
(a) There is a
(b) The merchant.
his son that 1% WAS VOTT
road)
(c) She.
old, told)
The farmer
foods. sneds)
。。
•{tall, 1611, wall)
the chickens with the lik
(ópld,
in the
along the
bost gost, float
Diluta
Garbondioxide containing hydrochloric acid fumes and water vapour as impurities are obtained when dilute hydrochloric. Reid is added to calcium carbonate contained in the genera ting flask. The hydrochloric acid fumes are removed by passing the gas through water, and the gas is dry by bubbling the wet gas through concentrated sulphuric acid. The pure, dry carbon dioxide is then collected in test- tubes over mercury.
Ca GO+ 2HC1 CaC1 C02
成
榮雜合體行銷
新
0.3 Substance A is either sodium or potassium bicarbonate,
When a solid bicarbonate is heated, carbondioxide and water vapour is given off, and the residue is a carbonate; Sodium: and potassium bicarbonates are the only solid bicarbonates.
2Ne HCO
ZKHCO3
•Naz⋅ CO2 + H2O + CO2
·82 CD3 + H2 0 + 002
The addition of hydrochloric acid to the white residue gives
off carbon dioxide. This confirms that the residue is a carbonate, as all the common carbonates are white solids.
Nay CO+ 2HC1
Co2
H2 0 C02
| K2 CO
+ 2HC1
2NaC1
2K01
Questions for next week
kame four allotropes of carbon and give an important uss for each.
When coal is strongly heated in a closed retart with an outlet,
three products of distillation are 1- (á)..
COLATE, The residue left in the retort is...
3. State three differences between the chemical properties of carbon
monoxide and carbon dioxide.
4, (8) Under what conditions and with what results does coke react with (1) carbon dioxide; (ii) water; (iii) a limited supply of kiri End (fv) sulphur ?IA
(b) Describe briefly the carbon cycle in nature.
(c) flow and under what conditions does carbon monoxide react with
(1) blood; (di) cuprous chloride; (iii) steam; (iv) oxygeni
(v) cupric oxide ?
被救確具依指席加格身被學學鮮
*本解分驗行
【羆街齒學初中都爲
願
目
服,處目的的
欧以現力主推
科普限之嗜露
的補正不要果本在體不,
揮健
品份保眼
健
科
晚
興但不保管學開工,更早學在的由學次保更包受極龍學期,科時
會
皮
科
之謀
改照軌局。死學有有擬因此
TADE
作爲据昨死在的物
興在日萬,作工研事從
可校工
十中門港來師講大倫 羅
四、八月,期一度識A將六 白樵土七城六新九(
作救於牙
·四街五十辆
林
森只畫始兩
科方
雨
國術工理國大
1
南余下九七四晚斯 大樂
松,大
The word in capitale should be in the sentence) z Fur thAA
to show where it should be placed.
50Spear louder that everybody may hear you,
(b) ON During the rar, many of us were fed dry bread.
(0) ALL They are in the game class,
(a) LAST They went to Japan Sunday
e) RED The girl has a flower.
9. Pat the correct prepositions in the given apsces
a) The car went
(b) Da dog look down
(C) The thief set fire
(4) There is a difference. (e) They were quarrellad
10. 7111 in the missing words a
(a) Tin was, he boy
(b) Can you tell me
This is the bat
Thia
the man
ary is the girl
and the folloring.
full speed.
your friend.
the bridge.
Berthie pen and that.
each other.
threw the book into the river.
te this?
-bought.
81la is lost,)
the teacher wanted to 600,
Gertain man had a wife. She would never do anything her busband wished. She always scolded him for a little mistake. The poor man went to a learned doctor and asked him what was the beat way to tame such a bad wife The doctor told him to go to the Aasen Bridge. If seemed very odd advice, yet the main went to the bridge over which zany donkeys passed in the morning and in the evening. Soon a woodman came by his bag as loaded with bandles of attoka. The ass stopped in the middle of the bri.
faster, tried his best to pull it and to push
but he
At Inet he lost his temper, He took a stick and best the animal än bárd se he could to make began to dam on the husband,■ mind. and asked for supper. dihen his wif
and curse him and ball bin
[Botha Tika, the, DesJaz on- TREN
promised to do everyth he told her.
began to reold him
J
*** since the worst
!!
免運樓二○六號, 要湯來邨永興樓五C 意大利、印度及泰國
(*)
[The woman(was).
atured.
((b) The husband went to a
3. disobedient to her husband,
TO ZET BODE, money
to deal with his wife
The learned doctor told him; (d) The aes obeyed, vue moorwa
to go to 21
to beat his wife with his. hand
*. a pulled it 2. he pushed it,
to get a stick in the forest, he beat it very hard.
(0) It lastʻTAS WAXO Opazan hei
husband, beCRUIS
2. he beat her.
he cursed÷her.
One part of a senteroe 10 under X. The other part launder
Write a letter against. feline on the right to show which part Cita Use & letter onde, only, falhe first one is done. For YOU
listen
on
not drink medicine.
iney let us
(0) I don't know
Answord to ASM 2
cloudy, (b) peagerul, toy foolish, (4) useful. (e)middy
8, (a) 6, (d) 7, (e) 1, (C) 2, (8) 9,
He is a good boy and gives any trouble.
(b) Shall we come next year?
(0) This room is large / for the vogn.) (a) The boy has returned hon,
(e) It 18 late to catch the plane.
(a) blunt, (b) start, (c) broad, (d)
»7(e) quias,
(a) killed, (b) drawing, (o) reina. (d) ebakan. fal toina. (a) 3 (b) (0), (4) ▼ (6) ►
(6) The rain that falls on the genug 9765 not remain there.
(b) It is easier to read book than to write one.
As time went on more and more work was done by animals. Fire has been called a good servant but a bad mater. Forest fires are difficult to stop onos th
18. (b) t. (c) d, (1) 18, (0) 4,
(b) 1. wanted his food, (9) 4. he had stover, (d) 5, called
the doctory (●) 2, the ime day, (1) 3. unpleasantı
10. () Could she finish the work in time?
(b) Tas he lets yesterday?
(o) Had the lived here for ten yeaTA?
Are the pupilu asking the teacher am ations?
Do demele drink's tot of water?
over, (b) from, (o) with. (4)
12. (a) headmasters, (b) comparties. (4) fest, (d) princes,