真四第張七第 日三廿月九年巳丁腐复
育教僑華
Question: 7
1978
【中學會考試題預習專欄
Chemistry (5)
In the experiment below, the gas. G produced is passed over the heated lead(IV)oxide in the came bustion tube and the excess gas G is then passed into an aqueous solutin_of sodium hydroxide.
flask
1
gas lead (IV)oxide
heat
conc H2804
copper
sodium
heat hydroxide
What is the gas G?
(8) live an equation for the for-
mation of gas G.
(c) that change would you observe
win.the: combustion tuber: what
would be formed?.
(d) Give an equation for the change; mentioned in (c). (e) Why is it desirable to pass
the excess gas G into dilute sodium hydroxide solution? (f)- Why is it necessary to heat
the reaction mixture in the round-bottomed flask?
(c) A white solid is obtained in
the flask at the end of the experiment. What is it?
(h) Would there be any gas G
produced when the following metals are used in the place. of copper turnings:-
(i) lead. (ii) zine?)
If there is a reaction, give the equation for the rcaction. (i) At the end of the experiment,
the contents in the flask is carefully poured into water in a beaker, What would you observe?
Question B
of
(a) 3.80 g of a dry mixture of anhydrous sodium -carbonate and sodium hydrogen carbonate were dissolved in 100cm water. It was found thay the: solution required 50 cm of a 1.2M hydrochloric acid to neutralize it completely. (i) Write the equation for
the reaction(s) involved. (ii) Calculate the percentage
composition of the
original mixture.
(b) Explain the following obser-
vations, giving ionic equat- Long
() apropriates.
a niece of copper
wire is piaced in an.
raqueous solution of zinc
nitrate, there is no
obvious charge; however,
when the same piece of
報氣天
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copper wire is placed an aqueous solution of silver nitrate,..there
are silvery, needle-like crystals deposited on the copper wire..
(ii) Neither water nor dry
Sulphur trioxide crystals alone turn dry blue lit. .ous paper red. However,
the litmus paper does turn red when it is added to a solution of sulphur. trioxide in water.
Question 9
(a) men concentrated sulphuric
acid is added to sodium chlo− ride crystals, a colourless.
What is cas X is evolved. the gas X?..
(b) dive an equation for the rem
action in (a).
(g) llarse the type of the chemical
üand present in the gas X; (d) The apparatus as gvod in the
following ia ram is set up.
electric bulb
platinum electrodes
battery
(1) The electric bulb does not light up when pure water is planed in the beaker, Why.is this-so? (ii) If as X is now passed into the pure water at a steady rate for some time, the bulb lights up and gradually becomes brighter and brighter, Explain briefly.
(iii) If a steady current is
passed through a dilutė aqueous solution of gas X, gas bubbles are seen around electrodes L and R. What are these gas bubbles around electrodes D and R respectively? (iv) Give the ionic equations. for the reactions at electrodes L and R res- pectively. 40
What would be the ratio. of the volumes of the gases liberated at ele- ctrodes L, and R?
Two.test tuies, A and B both containigm solve sulphur diox- ide solution. To the tube A some hydrogen peroxide solut tion have been added. (1) When a few drons of
barium chloride solution are row added into each tube, what world you observer Give jaio equi ation(s) for the: changes obedived,
(ii) If an excess of hydrock-
loric acid is now ad 边 to the reaction mixture
ach tube, what would observe? Explain.
in
with the help of ionic
pequation(s):
物理(五 金榮家
PHYSICS(5)
Exercise 3
Where necessary, take the
gravitational acceleration
真... 10mg
報日僑
五期星
日四月一十年七七九一屆公年六十六國民華中目播商教 Figure 4g
In figure 1, a block hangs from a spring balance
supported from the ceiling of an elevator.
a spring.
Scalandr
block
Figure
(a) If the elevator has an upward acceleration of 2.5 ms-2 and the balance reads 10 kgfy what is. the: true weight of the block, (b)What sort of motion will
the elevator perfarm if the balance reads 6.4kg$。 (cWhat will the balance read.
if the elevator moves: up- ward with uniform apeed. (d) What will the balance read if the elevator movee downm ward with uniform speed. (e) What will the balance
read. if the elevator cable breaks.
2.(u) What sort of motion:
must the trolley in figure 2 have in order that the 10kg block will not fall, the coefficient of friction between the block and they trolley is 0.4
trolley
horizontal ground.
Figure 2.
15kg
(b) In figure 3, block A has
a mass of 80 kg and block Ba mass of 48kg. The blocks are initially at rest on the floor and are connected by a weightless string passing over a weightless and frictionless pulley, An upward force F is applied to the pulley e Find the accelerations:
ay of block A and a of
block B when -ig. (a)480N.
(b)800N (c)1440N
B
Figure 3
floor
In Figure 4,
two blocks, each having a mass 20kgv. rest. on frictionless aura faces. The inclination of. the inclined plane is 0 if sinh 0,6 and assume that the pulleya are weightless: and smooth, calculate.
(a) the time palcula
required for
block A to move down 80m
(b) The tension in the cord joining the blocksp
10kg
20%
Lunknown
metal
Liquid.
4。(a) In figure 5, three identical metal spheres
AB and C are of same' mais. State how can you find the centre of gravity of the system (the 3 spheres). Show your constriction lines.
A
Figure 76.
Figure 5
(b) If the mass of spiere A
is twice of the mass of sphere Be mass of sphere. B and C are the same, Can you use the same method
c) in (a) to determine the
centre of gravity of the system?: Explain briefly.
· If not, try to find the position.of.centre of. gravity by any other method.
(c) Using the result of (a),
or otherwise, determine the centre of gravity of the uniform lemina in figure 6.
Figure
5. A metal block is suspended
at one of the ends of a uniform rod. The red,in supported by a knife-edge at the middle and the whole system is in equibrium by hanging a block of mass M at a distance 0,4m from the knifewedge(as shown in figure 7a.).
M
You who
"Kaife-edge
figure 7a
Metak:
The metal block now is: completely immersed in water. In order to keep the whole system in equilibrium, the block M has to move to the position 0.35m from the knife edge, as shown in figure 7(b)。
figure: 7b
metol
(Determine the relative.
density of the metal block,
(b) If the metal block 19
now immersed completely into an unknown liquid and the block, M has to move to the position 0,32m from the knife-edge to restore equilibrium, (see figure 7(c))Find the
relative density of the
unknown liquid:
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天氣報告,漁民天氣報——八時四十五分,新
告-{描大一〇千過開及天氣報告。
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九時十分,警訊,
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北愫。並兼用中波六四王阿菲浪《靳泳安、梁 本合由上午六時至浴枕畔姑嫂埌案 公司”的降卅分及起下午四時四十一時十九分五十市」花。 與柳館 音 應戰類九四及一〇三葉溪、李慧),還君惜簡報,空中俱樂部" 會計興辦理。 羼日凌晨三時,採用位富);萬里送昭君(賽馬貼士,卅分,新- 首》,卅分, 十時,空中啾: 簡報(翁田間
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十二時,新寶
,天氣報告,亮。
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七時-生活與你,
綠邨電台「開時,當國長
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順民天氣預告。: 十八分,天氣報告,源廿六日,大結局。 及联类金融财熙,十五分,下午旋律,甘A分
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·
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八時十分——十二
事預映特輯。
小老鼠娶士、四川粉筆 :玉時,兒童世界、
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,
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一米勒,四十五分,幹。
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