美二第張四第
日七廿月芷年午丙磨复
WAH KIU YAT PO.. 報
華僑教育
一九六六年度
英中会題 試題預習專欄
物理科
「Solution)
(平)
陸永熾,
PHYSICS
(1(a):
Volume of aluminium block)
Volume of copper
Density of almam
Block
10 x 4 x 44.0 160 c.c. 3 x 4x4
cad Dan/
Weight of alueil
right of copper S
gifo.o.
160 x 2.7 ga. MUK) 16 x 27 g.
19 gm.wtz
16.x 27 g#.WE;
三期
日六十月二年六六九一层公年五十五國民中
化學科
(七)
王錦釗
英中試題預習專欄
CHEMISTRY (73}
2HCY'
* Hai CO.
36.5
23x2+12+162
106
The equivalent weight of HCI 36.5.
-55
If we wish to pre 1 litre of normal sodium carbonate?solution re must weigh exactly 55 grams of the pure dry anhydrous carbonate. and add sufficient water to make up 1 litre of solutionARE),
we will first out a sufficient amount of the pure, but not isture free, sodium carbonate into a large evaporating dish and heat The dish and its contents gently witzi a constant weight is obtained the sodium carbonate is then dry few bird hold
53 grans of the bure, dry anhyurvus paroonass are unen weighed in 1. clean, dry beaker Distilled water is added to dissolve all the alid The solution is then poured down a glass rod into a funnel: weeting in the neck of the-1itre measuring Tlask which is previously insed and cleaned with distilled water when all the solution has seen transferred to the measuring flask, the breaker is rinsed with istilled water from a wash-bottle, all the rinsings being poured How the cod and funnel to ensure that no solid is lost in this process The rod and funnel are then rinsed, and the funnel te emoved Water is now added until the liquid is level with the mark an the flask. It is advisable to use a pipette in the latter stages,: so that excess water is not. poured into the Task. The flask is then stoppered, and the mixture is well ahaken so that the solution may become uniform throughout The solution in the flask is a nowal solution of sodium carbonate
It only sodium bicarbonate is available the bicarbonate is heated in an evaporating dish. The bicarbonate will decompose, giving off carbon dioxide and water vapour, and sodium carbonate Left as a residue in the dish
The neating is continued until the weight of the dish and its 「contents fa constant The residue in the dieh is then pare ary. sodium carbonate A normal solution of the substance day then prepared in the same manner as that previously described.
-itres.
11ches of N-H2
· 23x2+12+16x3
106 g.
(1) e % 200 ml of N-H250,
200
200 m3 - of 5-N-X2SO
23x2*52€16x4, 22.6 Litres
at N.T.P.
106 gs of Na2CO3. 10.6 of Ma2 CO3
■ (10.9 × 2-)ga of Na2 C01 1:20 m. of Raz CO
htTof Na2CO3 which could be dissolved by 200 ml of this act. salut ion
1.20 gm
2 litres of N-H2 200 ml of N-H2 SOW. 200 ml
i
22.4 litres of co2 at N.T.P.
2,24 litres of 002 at H.T.P
@ (2 24 × 2)Mitres of 002 at NTP-
volume of CO2 evolved by complete solution of this wt of Naz00
(12:24) Litres at N.T.P.
Hence vol of CO2 collected at 17°C and 750 m pressure
2.24 x 5 x 760.
·44 x 273.
275.9 mi
274 mi. (to 3 sig.fig
anhydrous sodium sulphate formed.
Na SO 10H20
124 2:x
142 10 x 180 312
wt of 2001 um sulphate crystals that can be obtained from 142 gua anhydrous salv -
312 E Hence wt of soilpnate crystals that can be obtained from 200 al
3.55 gmsho
As in diagram (a), G1 and G2 are the centres of gravity the aluminium an
and copper bimaline
Sinew the weights of them are
between G. and,
„Gh of thei
REFERENCE LIBRARY
16FEB 1966
CITY HALL
0212 50
1 x 2 + 16x4+32 98,
2NaOH 2(23+16+1)
80
Naz 50%
2H2
The equivalent weight of 250%
The equivalent weight of Nurs
strength of the given NaOH Solution w3.gd the normality
40
per lit.
Questions for next week
1 Seite may be prepared by a neutralisation of an acid and an sikala.
(b) double decomposition, (e) direct synthesis Illustrate these trred methods by describing, briefly the preparation of (1) pure, ary crystals of potassium nitrate: (1) pure, dry calcium sulphate (1114 anyorous ferms chloride
C.2. State oriefly how nitrogen can be obtained from
.da ammon 1
Equation.
the normality of H230, aolution
ace the concentration of HOSOL solution (19
s per titre
ama per litre
Equations-
3 Bescribe, with the aid of diagrams, simple experiments with amani do
chloride, to illustrate the following terms
(e) Sublimation,
16) Thermsi dissociation.
有關上項比賽之空涼法,昨經向教
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·三日在伊利沙伯中學作示範演出 與 學校
教署主辦小學器械體操比賽
港九新界冠軍總决賽 四月十五在九龍舉行
比賽項目之各種作均有規定 本月廿
「育司署公佈,其受患者
上强在肉的到,七年之自調動作,不得超魂一分
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【 在荃灣官立中學科常举行,由上午九時
肯得及 九六六年四月十五日在龙打發 lil)參加索:()詿册之
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分,作結構三分,演出姿勢五分。《五 直跳箱:分蟋脞題,現磋越,前後分群
- (1) B6 (1) S
自强動作之計分法爲由落至十分,啟風 可由任何人在該比賽风旁作保護,保
出 天有橋及比賽為神得我低該項分數。(四
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, 女足蕯緻,分鸱前或後迴環旋轉。BN
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人生,也須過傑與用具必須依照下列[回演出,
歌可以接换五 阿力伯盤報),雙方後宇翻。C三)
。。 櫫IA,反手握楫向後迴邀至杈上克韋
牌合必起作
,手直舉地開一
樓致育司與鼻者短得成类 茶名(正案 參加常可涅向九酵紐西蘭参道邵氏大厦六
書:(四)獎勵法:《用心瓿冠軍尉。「立,屋取回豆姿,側紙薄埋玄立。CL 一個上平衡,平衡步行至桷巾般隨飾單
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·算者,均安蒸锦获南。《丙,想念說, (乙)分遮奖直捧得陳冠、亚、季
一會供應。;
*面積爲四英寸,愽五英寸。 「易於財之號磡(由!?),號碼布 宋穿運動服裝,其現在背部絡上白底黑字 (五)服裝:凡參加比赛之间后,均
(六)泰械,所有各項目器械為由藝
動自由基作一次示所演出,凡洛莉比赛之 月二十三日下午三時在九龍洗次为伊利 (八)以上各項勘作定于一九六六年 學校教師尚時可對參觀。 教育顧問郝施爵士
日育
昨日訪問聯合書院
(一)徒手操、商机役達電離八處里東立,因對香港中文大學豕合書院,由該院院展 「曹際肚,英國聯邦發展部教育事務
咨询 膝文前八規
起
*選官直立。(二) 上酡作:A直萬一院各畫,他只貓而去。
方序撒足保,雙甲向上饒,李向前彎,射一班,后成良外,阿甘斯除長等陪同武要談
「Deend to Fof "oa
Pressure at Aizl• Pressura:at;0]
[Fressure_dus:to] [{011:coltan •forescure dus to He→→
(a) Frictior
a) pressure Que "DO NIE
$10,570 +18 10.5=10)13.6}−1(32 4
201 -0.1[x-13.6]
10.9 gm.
And The .03 or off in 0.
The parachutist is falling at 30 sec
The coin, reling from his pocket, Leo possess#g
a velocity (1614 161) - U - 30 milane
Acceleration of the falling.
TooLn,
The velocity then?
at
30
9.3.
30 78:4
its velocity will be 108,
When the 40-lb weight is 30 ftup a slope through a vertical height of ̈)
8:30 PL
(HÓPK GORÉ
140 x
t
رسة
M
]]
TUN
(30 x 8) 1b.wt
1,240 ft-lb.wt.
Ework Tdone 7(L)*120 ft-10
(11) 240 ft-16,
From bridge to water: surfaces.
anitaal velocity of stons
Acceleration ofistene
Final velocity of stone,
980 x 2 /sec.y
Beight of Bridge,
from väterface to bottome
Upthrust of water on stone
Unbalance force.).
Ane. The bridge 18 19.5 metree nigh
The stone takes 34.600,_ko_rès:
questions (9)
15 Lei Define the noefficient of briation and explain, clearly
the difference between static and kinetic friction.
wooden block slides down an inclined plane with uniform. velocity when the plane is inclined at an angle of 25 2 the horizontal. If the inclination is increased to 10. (what is the acceleration of the wooden block down the plane
A pendulum clock loses
3
19.6 metres
100
(100,-)
5 sec. in 4 day, what
remedy should be made
to correct it?.
(b) Block A weighs 100 LOXY
Coufficient of frictions between A and the table 18 0.3.
(1) If W 19 20 lb.wt, what is the friction exerted on the block?
/(11) What in the maximum value
yor W that will still ma inte in-
the equilibriwa of the Bystepre
* OUER-WE
Acceleration of ston
60 x 980
100
Depth or
raised.
2t
980 (203
* 6 x 98 cm;/
31.36 m..
3136
3.21
Bec
Á mane 10 lb. and 5.0, 2.3 is suspended, completely Lomer and
in water, from a spring balance attached to the roof of a
lift. What will be the reading of the balance if
(a) the lift in moving up with an acceleration a
(b) the lift is ralling freely under gravity? ·