- 第張七第
買三第七第
日期廿四年
颚 WAH KIU YAT PO
B
英文中學會考化學科甲部試題(昨)
State whether the following oxides are acidic, basic, amphoteric, or neutral,
(a) Nitrous oxide
(b) Aluminium oxide
(c) Sulphur dioxide
日七月六年一九一公下十五国
In the following groups of substances, one as different in one respect fre
the rest. Write the name of the substance that is different and name th point of difference.
(a) coal, wood, charcoal, clay, coke
Answer
(b) sodium chloride, potassium chloride.
calcium chloride
Answer
carbon monoxide potassium permanganate,
lead chloride,
conner chloride
potassium dichromate,
chlorine,
7. Name three substances that will soften "permanently" hard water :
(c) oxygen,
!
Answer
(1) (2) (3)
8. The graph shows the solubility of potassium chlorate in grams of solute per
100 oo of water.
SOLUBILITY IN
GM PER 100 CC
SOLVENT.
60
25
20
20°
40°
60°
15. (e) 1 gm. of metal Y released 0.05 gm, of hydrogen from an acid.
equivalent of Y?
Answer
16.
(b) 19 gm. of an oxide of metal Y on reduction gave 15 gm. metal.
the equivalent of Y?
Answer
What is
:
What is
(c) What is the smallest possible atomic weight that can be found from
results in (a) and (b) for metal Y?
Answer
A mixture of oxygen gas and ammonia gas is,) (a) Bubbled through water
L
(b) Passed through a calcium oxide tower)
(c) Bubbled through sulphuric acid,
Place the letter R against any method that will cause a separation of gases and enable one of them to be collected separately..
the
E - 980M
跨大案媒罷了!」
通話 你的聚户 啓程去了
REAK
一只淡淡一笑但算了——依然待她平日一樣 贰 她們,當澡又是說謊,他仍不拆穿,
TEAROVEDENKO.2* 10 17 BY DEC
..
魟,立刻發現她許多破綻。以往他在家時,無論如何也云俏失去她,必須小心從事 好,從此部小心來對她加以注意。一切往前追她到头发方面去了[度]设在愛妣
常常有擘話來,如站他接,那附屐许有车, 不能魯莽。
在忍不住了!
向老要拋出離婚的話。把來推去,小柯鸞,使國登C財精神更不好,於是許多家長遠門。及明太師 忍,所以小可一再過她,她始然沒有勇氣,但時已深夜,再遊下去也就影响了帷眠,薄影梅西難消受,其和女性 去了老梁的一切生黹雄究竟在坐於心不有時家長向他们安慰,叫他们体一刻再做」錕略曰:「我性導遊書生,連導式,你有心 穡感!同時她也知薀油一釐關老溧可能奪精神不集中,藤不能做得訐,便意焦,段,亦有學問,任三郎之擇 淡經營,尚未恢復原狀 * 不過 烈内做的!何况過與老梁到底也強有些」了,他说得發氣,更會哭起來,愈是也,說少,我肥 而空 - 余經過一個月來之後 -亦氣所消受,多謝二娘關 背闾衆,到底有一天,召致不
28/36323H3%<~~82 | NZZ-ESRA-GURATS} < • { PKD- | SENES
幸,大哥宜勸其商家、」前
80*
100%
17.
TEMPERATURE IN °C.
(4) What is the solubility of potassium chlorate at 50° c.
(b) How many grams of potassium chlorate can I dissolve in 400 os of water,
at 80 ch
(Nitre
Air (Lime water)
18 a
}
Underline one of each of the alternatives to make a correct statementi
compound solution mixture
nitrogen quick line water
of oxygen,
Answer
and other
elements
gases liquids
}
water
which include
carbon dioxide
Answer
(0) 470 grm, of potassium chlorate were put in a litre of water and the
solution heated, At what' temnerature would all the salt just dissolva?
Answer
18.
9. A metal X has an atomic weight of 56 and valencies of 2 and 3.1
(a) What are its equivalents?
Answer
(b) Write the formulae, for its two oxides and give their molecular weight.
(0 = 16)
10.
Valency
First oxide
2
Second oxide
3
Formula of
oxide
Molecular Weight
of oxide,
State the products for the reaction of hydrogen sulphide gas when it is,, (a) burned at a jet
(b) passed into chlorine water
(c) passed into copper chloride solution
The apparatus shown is for the electrolysis of water,
19.
Label the diagram so as to show,
·
(i) the electrodes
(ii) any observable charges that have occurred when an electric cur?
has been passed for some time,
State one condition necessary for success in the electrolysis of pure
(Equations are not required)"
Inree substances were tested and the results are given in the following,
警深,並會同了醫宮,指緻人盈和攝影獎
當-所以我們每晚都派對若干警探,分在 用郊區的房屋,在夜深人靜時作違法的闪 巡.........爱沂我们接密報說歹徒利 四和九二八六號兩個袋員奉在 郊區仟 3涖,希望能有獲——。他們經過 九六號發做則手持黃寳用的手谌筒向前面照去, 多說一句話,我只對訴他,我 他們走遊了基內。在手此商的光下,他們發現到稍後自啥有打黹話來的。我們 在家,我因為太匆忙了,無以岗你的工人 「我在一時稍後曾打電話給你,你不
--
Substance Heat the
substance
11.
Fill in the blanks in the following passage with suitable words
"Mixtures are made by mixing two or more substances', *.g. a
Shake the sub- stance with water and test with litmus
paper.
Add dilute acid-
Apply the
Flane, Test
and a
to fom a solution or a suspension. In maxtures
A
No reaction
the proportions of the substances
Compounds are the result or
B
.CO2 given
Litmus turns blue
No
Substance
change. In
off.
reaction
a
V violent reaction"
IR
0
*
no reaction,
compounds, the proportions of the substances
12. Complete the table by using the letters:
reaction takes place X not decomposedļ
Effer-
vescence takes place.
+
Golden
Bright red
dissolves flame
yellow flame
stance wit
substance
No reaction
Heat the
White
No reaction
D www
decomposed
Metal
2
E very soluble
$
F
.
soluble sparingly)
soluble
I
slightly
insoluble.
20.
Effect of Steam on
the Metal
in water.
The: Hydroxide of the Metal Solubility
Effect of
Heat
fumes ziven off.
No reaction
No
reaction
Ammonia given
off
Bubstame A is
Substance B is
Potassium
Magnesium
Copper
13. Name the products when the following substances are heated.
(No equations or formulae required).
(a) lead carbonate
(b) lead hydroxide
(0);« mixture of sodium nitrite and ammonium sulphate
(d) copper nitrate
(9) ferrous sulphate crystals
Supstance C is
Two substances X and Y were tested with the results in the table>
acid to the substance
off Brown fumes given
Sup-
stance
Heat the substance dry
Add strong sulphuric
X
Brown fumes given
A yellow powder. left..
Y
No reaction.
off.
Heat the substan
charcoal
Brown fumes given
Grey pellets left
which mark paper
Colourless gas evolved Red scales are for
which has a choking
smell and funes' in moist air, Blue solution left.
on the charcoal
Substance I is
Substance X is