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WAH KIU YAT PO
報日僑
•期星
(1) 24.8
(2)
上列各數目;何者耀:
log 2 og 4 log
中學會考數學(甲)
卷一試題
360°,则万輕
溺元鶯燠個
題。
全解制是
#{1}
(2)
僅有
(3) xyz
僅有(3)/
B-77(1) (2)",
僅存(1)。(3)。
· EX ̄‚†í (2) ►· (3) •
•) (:) - (6
· 11 · 10 - 20, y * 60 /
∠B大30°,則
ཡ
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佔了啦。宏例諾相距30米,且乙站在即站之正買。今有一間位於乙
正五角联典正十角形之一角之出
(三分):
1
CB=O À CRUZACERLADE
(四分)
蹤映射fNXN+N 之峩宾
xty (mod
問下列何者之
四分
(*)* (2) E 2xy.
(*) 1010810
== PR OS OR
10 loziob
AG:GD=21
(1) B XOC 2.0D
四分
二分
(照)在40個週考數學或生物的同學中,有34人篊性藥
21人逃生物。問翮科問選當有譏A
破。
̇絯搜巇在任何三你飲中,我否從數字之网传i于仪器作之3销
IN 1939 » 1969 +10+
‘此三位眩可装?繼錄來此三程數。
日三月六年四七九一腊公年三十六國民業中 目播育教
chloride at 50 c 18, 42:58/ 100g.
When 40g. of sodium chloride with 40g. Qf potassium··· ohloride is added to: 100g, of water and heated to 50°C all the potassium chloride. dissolve, but only 38g. of sodium chloride dissolve.
The maes, of solid that reasing dissolved in -(40,- 38)g.
To distinguish formic acid. and soetle Boid:-
To 2 test-tubes contain- ing potassium permangana. te solution, formic acid |... and acetic acid are added separately and warned gently. Formic aoid wdl1. decolorize the purple potassium permanganate. Bolution but acetic acid will not.
ethene and
To distinguish ethen
ethane: 8.
Ethene and ethane are bubbled through two test- tubes containing aqueous
Ethanie bromine solution. will decolorise the rad bromine solution because it is an unsaturated som pound but ethene will because it is a saturated compound..
not
(112) To distinguish magnesium
Toxide and ging ́oxide.
To two solutions of magnes Lum oxide:and、sing oxide in two separate test-tubes sodium hydroxide solution is added. The one which contains zdno oxide-will: produce a gelatinous ppt. which dissolves in SX0898 sodium hydroxide.
·Zn0÷2NaOH
But magnesium oxide has no reaction with sodium hydrox- ide solution..
(b)
(1) The ammonia gas will be
evolved from the concentrat- ed ammonia solution, “ (11) The hydrogen chloride will
ba.avolved from. the concent trated hydrochloric acid, Ammonium chloride is formed. (tv) NH3(g) + HC-(g) (6.
- NH01,
The colourless ammonia gaa.... and steamy fumes of hydrow gen chloride react to formi the white fumes of
simpniur chloride.
ammoxi="
(v) The white ring is displaced
from the cidway, hear she. latter Qin the diagram. (vi) The vapour density of amid
ia (8.5) 1a smaller than
of hydrogen chloride (18.25), sa that, by Grahamk
the rate
that
of diffusion of ammonia horogen:
be faster than that af.
en chloride.
(vii) If the concentrated ammonia. solution were maintained at Cu higher tem
teaperature, the: position of the ring would be displaced more closely. tc. Q than beforey because an increase in temp. increased the velocity of the ammonia, moleculep so that the ammon- ia molecules would diffuse faster than before. This is explained by the kinetic molecular theory of gasen,
(viii) NHẠC
53.5gm.
·0.01.
KOL
53.5 -17 = 0,01 : 1.
3.(Bement
Weight Atomic
Relative' no. of
atoris
1730.01. 0.00318 gm
Divided by 0163
the smalleat
no.
Simplest formu
axygen.
25.616
OXY MAYZER
蝦粉:
兩相遇找數
兩相苏素數
兩报源實數
符
(文) P外分布 4 (5,10)和B(-2.3)之解:AB
(-16
間下列何者找P之出耀?
31).
()()ŒERE #PSÆMR3(mod 3):
加迷法
0 .1 2
{八】 服A的存急嬬180出金,臘出日的亦里饯2000
临出新曲式可跳形居式,斷齒YT躜410元。
四分
分數
_) (0, 1, 2), 0). A&?.
石雕恆相聯,則P之軌跡方程贯何?
細數人款)
20
180
-1000
(c) A(E) + B(g) ~~~ C(6)
(i) Increase in temperature.
increases the rate of prom duction of C because the kinetic energies of A(g) and B(g)ara increased at higher temperature so that the rate of reaction of their molecu les le increased (by the Hinetic molecular theory.of.
(11) From the equation, 2 volumes
of the reactante produce: 1.volume of the product There is a net decrease in volume when C(g) is formed. A decrease in pressure will accelerate the rate of for- nation of C(z) because the
·molecules of the reactants. A(g) & B(3) are packed more clonely together so that: their chance of collision with each other is also in- creased. (by the kinetic molecular theory of gasee).
·(b).
(1) G is chlorine gas (ii) Potassium permanganatzis used
as an oxidising agent, (iii) Iron (III) Chloride is
`formed.
2F0 + 301
2Fe C13 (iv) Dilute qodium hydroxide.
solution is used to collect the gas G because the result- ing products are more stable than that when other collect ing liquids are used such as water.
(v) Chlorine Teaqta with cold. dilute sodium hydroxide so lutions of sodium chloride and hypochlorite. S Cl2+2NaOHN&CL+NaOCL+HO
(vi) The faverted funnel is used
to prevent sucking-baok', because chlorine is very soluble.
(1) The gulphur trioxide and
sulpmr dioxide both dissolve inwater to form sulphuric acid:
and sulphurous acid respect- ively.
21+
其體
36.cm?
下列何者不组织发了
BRR.{}})
DR (0)
ERROR
考生能及格的试然地篩。並甲,乙孝生之脱格
否辉不相關水件,問政睺考生均能及格的染然 我何?
某人肥一次工人工的股因路
*全部工人都懒惰說他們的顱盘次 要否定進個設法,我們刻深町
全部工人不補憫。
全工人都不懒情或他們的薪金不常少。 C、全部工人都不無得和他們的薪金不减少
有些工人不懒情或有些工人的薪金不能少。 三有些工人不愧情和有些工人的朝会不太少
同安
五一四四三
新、分新新新聞更新 運新情
吉撅
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(£) A (OO), B(1,0), C(15, 1), D.
保一正方形之项数。體
(0)-(90)
一平行四潼形
不雒躞的機狌门
-對角鐮相等的四邊形
-圖内描四赠狂
** (E)
› BOM - MA√ MC = CB
log (ab)
(超)已知、xlog
Y
腿否補
烧
能
10001
能
點
試就上硎流圖解簽下題:
一年是1899年後的第一闐年1
三分
試卷味:
中學會考數學(乙) 卷二試題
-12 偶饮式。
三分
5 S = (A, B, C} Á ÞA - Z
A
解答
中學會考化學(乙)答案 坚道英文書院 王兆女
Chemistry
HONG KONG CERTIFICATE OF EDUCATION EXAMINATION: 1974
(a) From 'the graph given.
(1) Sodium chloride and potass
ium chlorids have the same solubility at 33 0.
(11) The solubility of potassium
chlorate at 52.0 is 21g/100g The solubility of potassium chlorate at 23 C is 8.5g/100g.
(100+21)g. of saturated
potassium chlorate golution.
when cooled from 52 0 to 23 0. will deposite (21- 8.51g. of crystals,⠀
The mase of crystale depo- sited when 300g. of sati ated solution is used is
(21-8.5) x JALNE(100+217
=<12.5 x°
30.99 8
(111) The solubility of sodium
ohloride at 50 C 18.38g/100g. The solubility of potassium
硬五四案 天市十十通
“夜英分開 分市 卅 十,九天夜語,八,價七分分六氣價分五情五
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(iii) an increase in the concer-
tration of B does not affect the rate of formation of C(g) since the
(a):
ratio of. the relative volumes of A(g), B(g) and C(g) da fixed under the same. "conditions of temp. and pressure. (by Gay Luzasaos Law of reacting volumes.)
(1) The structural formulas
the two isquera are; CH CEOH2OH: and CH. n-propyl
alcohol or
propan-1-ol.
CH-CH
Asopropyl alcohol or propan-2-ol.
(ii) Propyl alcohole reacts with phosphorus pentachloride to form propyl chlorides:.
CH3CH2CH2OH + PC1S
n-propyl alcohol CHgClipCF_O1 +:HCL+ POC1_ n-propyl hydrogen phoaph- chloride chloride, oxyl
chioriw de
CH3
CH-OH + F035.
iso-propyl alcohol
CH3> QE_O1 + HCl + PO013
CH
iso-propyl hydrogen phosps. chloride, or chloride, hoxyl ohlor
十時,新聞,民道
-五十八分,天。
代曲,十風分,「空中
選 食唱 曲 曲天 分享 民,五生,高耀中 時
分义
log 2 #log3
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・天記分投
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的糖
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分。四卅分山 十分
ide
The ions produced are sulphate ion 50%, sulphite. ion 50, and hydrazonium ion Bot.
(ii) When the barium chloride solution is added to the solution.in (i). The white precipitate contains bariwe
ulphate and Barium. aulphite:
(111) When dilute hydrochloric
acid is added to the preci- pitate and heated, a colo- urless gas evolved. This is sulphur dioxide: Ba30g+2HCl→ BaCl2+H20+80gm
However the white ppt. does not disappear since the barium sulphate does not décompose..
(iv) If the dilute sulphurio
acid replaces dilute, hydro- chloric acid in (iii),
there is no reaction;
*開時天 公交時天新十
... 十一時,新·天
十二時,天就,金、吳楚帆。
·商業二台:知,五十五分,台面
裝,在中無人私隱時。 书]主演:胡、南江 ..七時廿五分, 與角度:卅分,新聞及
·七時·新班。
舞,十分一夜。
|「無谷」
「探案」片集:黑演
| . 九時卅分,違的電
氣條 撤知,氣開五
民矓
天
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片一的
紅未分失,
•五下文
-1音樂,十五分,屋 代曲,四十五分,英語|八C座。
香港電台 陈人不怪,明 選唱,卅分,天氣,一,祂九時事,卅分:十一片「老豆書鶴女基 一片時,新聞 天氣及天氣,四十五分, 卡镭片集,卅分,新聞 東
「瑞遊世界。
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