六期星
syringe decreases and the greater
育教僑華頁三第張六第
1985:
日一十月十年子甲夏
WAH KIU YAT PO
報日僑華
life process.
d) State andther means
to
中學會考試題預習專欄
Syringe
·Plunger,
生物
(+)
D
increase the intake air other than increasing the rate breathing.
of
of
EUR 242##*# Glass Tube Balloon
e) (i) which portion of
the brain sends
c)
BIOLOGY (7)
W-W. LEUNG
MILI & DALE PRESS LTD.
Unit 2: Gaseous exchange
between organismS
·and environment
7. The diagram below
shows an apparatus at the end of an experiment in which the respiratory activities of snails were investigated. The screw clips were open for one minute, and then closed to begin the experiment,
Rubber Scale tube
Screw clip
Screw clip
JUD
Snails Coloured water
in a capillary:
U-tube
Thick cloth.
Gas
Name the apparatus.
b) What is the purpose
of using
(i) the thick cloth? (ii) the screw clips?
c) How many unit(s) had
the coloured water. level at side B risen during the experiment? d) Explain the rise of
at side
coloured watee:
B.
e) Did the changes in
environmental conditions affect the result? Explain your
answer,
Suggest two ways to increase the rate of rise of the coloured water at side B.
8. The diagram below.
shows a model
constructed to
represent the
structures of thorax.
It is used to
demonstrate certain
1985
中學會考試題預習專欄
化
墨
(E)
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CHEMISTRY (7)
REGINALD W. CHU
MILL & DALE PRESS LTD.
Question 101
(a)In the experiment as
shown below oxygen gas is bubbled through some concen- trated aqueous ammonia solution above which a hot platinum spiral is hanged from a glass rod.
охуден
gas
a) what part of the
thorax does the plunger represent? State and explain the effect that is brought by pulling back the plunger.
c) (1) What does the wal
of the syringe represent?..
(ii)What effect wil the lungs
on
be if this part. the body is perforated?
d) An athlete can release
sufficient energy in
his muscles to rùn a 100 metre race without having to breathe. (1) Name the substance
that will
accumulate in his muscles.
ii)Describe the
actions be will take to remove"
this substance.
9. The graph below shows
the effects of
Breaths per minute
inspiring room air, 100% oxygen and 92% oxygen, 8% carbon dioxide on the
breathing rate.
of
mán.
92% 0,8% CO
Room air
100% 92
AIR & GAS
4 AIR Time ON SUPPLE OFF (minutes)
a) From the graph find
the normal breathing rate of the man.
b) According to the above graph, which factor seems to play a decided part in governing the
breathing rate?
c) What is the effect of
this factor
on the
breathing rate?
platinum spiral?
(iv) The platinum
spiral has to be heated initially. However, once reaction has
the
started, no more
heating of the
platinum spiral is
necessary. Explain
why is this so.
What would you
observe if u few drops of blue litmus solution is added into the flask at the end of the reaction? Explain your answer briefly.
(b)In the experiment as shown below, ammonia gas is dried and: then passed over a metallic oxide X. A colourless liquid Y and a colourless gas Zare obtained as
the products.
out nerve impulses to control the rate of breathing?
ii)What are the
two
structures that respond to these impulses?
f) Explain why the
ambulances are
commonly equipped with
resuscitators with
tanks containing a
mixture of 95% oxygen
athospheric pressure. forces air into the balloon..
(1) Thoracic wall. (ii) The air sars wiEF
collapse and stick together. The Fungs- will not be inflated.
(1) Lactate. (ii)He will
increase his
breathing to intake
more oxygen to
oxidize the
accumulated lactate.
物理
(七)
and 5% carbon dioxide. 1809 HARR
Answa
76
a) The differential
thermometer
) The thick cloth is
used as an insulating material to reduce. heat exchange with the environment. (ii)The screw clips are
used to equalize the gas pressure at both sides before the experiment and maintain a close system during the experiment.
c) 2 units.
ide
d) The respiration of the
snails released heat energy which caused. expansion of air in: the test tube at A. The expanded air pushed the coloured water towards side B.
The changes in environmental conditions did not affect the result because both sides were subject to the same changes,
f)
(1) Increase the numbe
of snail's. (ii)Increase the
8.
activities of the snails.“
a) Diaphragm.
b) The balloon is
inflated because pressure in the
ammonia gas.
(iv) Would there be any
reaction if solid
(1)Zine(II) oxide; (2)lead(IT) oxide? If there is NO reaction, state so, If there is a reaction, name the product(s) and write an equation of the reaction.
Question 11
In the experiment below a mixture of potassium nitrate and concentrated sulphuric is gently heated and aale-yellow liquid Y is collected in a round-bottomed flask cooled under the water- tap.
water
brown fumes
glass
receiver
concentrated
∙aqueous.
platinum spiral
ammonia
antmonia gas
solidx porcelain
·gas Z
boat.
the
•heat mixture.
solution.
a drying heat agent
cold water
(1)
Name the substance formed at the platinum spiral. Write an equation of its formation.
(ii) What would be observed near around the platinum spiral? Write an equation of its formation. (iii)What is the
function of the
syringe.
pale yellow liquid Y..
(a)Name the apparatus.
marked with X.
(b)Name the liquid Y.
liquid (c)write an equation of
Give the names of the substances Y and 7 respectively if X is copper(II) oxide. Give an equation of the reaction..
(ii) Give a chemical
test for the presence of Y. (iii)Suggest a substance suitable for drying
the formation of Y. (d)Name the brown fumes.
observed in the apparatus X. Write an equation of its formation.
(e)Why does the liquid Y collected has a pale-yellow colour? (f)Suggest a a simple way to remove the vellow
PHYSICS (7).
H.K. LO
MILL & DALE PRESS LTD.
Exerc
Mechanics, and. Properties of Matter
1. A truck travels along a horizontal straight road, the speed-time graph of its motion i; shown in figure 1. Speed (ms")
10 30 50 70
Figure 1
日三月一十年四八九一曆公年三十七國民華中
the truck before it decelerates.
A uniform metal rod B shea long is bent
into a right-angled 1-shaped piece as
shown in figure 2. The Wire is hung on a smooth peg at the point of bend. Find the angle between the 50 cm aro and the vertical when the piece is in
equilibrium.
30cm
Figure 2
50cm
A wooden block is weighed in air, in water and in liquid X
as shown in figure 3(a), fig. 3(b) and fig. 3(c) respectively (Deusity of water
-3 -1000 kgm ration due g=10 as)
accele- to gravity
(v).
the block A in
liquid X,
the density of liquid X.
(b) If a lump of metal i s
attached to the bottom of the block and causes the wooden block to float in water with its upper surface just covered by water as shown in figure (4)
Figure 3(d) Find the mass
of metal
attached if the density of the metal is 8000 kgm-3.
in
4. A uniform glass tube
40 cm long is lowered.
into the bottom of a lake and water is found to rise 10 co the tube. If the atmospheric pressure is 760 mmHg, find the depth of water in the lake, (Density of water in the Jake
-3.
density
-1200 kgm
of mercury
2N
13600 kgm
BN
stage
90
10 Time (insec.)
A
Fig. 3(a) Fig. 5(b)
0.5N
(a)Which stage of the
journey takes the longest time?
(b)During which stage of
the journey does the car travel the greatest
(c)During which stage(s): of the journey does: the car travel in ́únīform speed?^*~
(4)During, which stage of
the journey is (1) the speed greatest,
(ii) the acceleration
greatest,
(iii) the kinetic
energy greatest. (e)Compute the total
distance travelled by coloration of liquid
Y
(g)Why is it not
desirable to heat. strongly the mixture in the apparatus X?
(b)What is the purpose
of cooling the receiver under the tap water?
(i)Why is it necessary
to use an all-glass. apparatus in the above experiment?
(j)Describe what would
you observe and explain, with help of balanced equations, in each of the following cases: -..
the
1)A few copper turnings
is added into liquid Y. When the reaction the reaction ceases, mixture is filtered. The filtrate is then evaporated to dryness. in an evaporating dish and the solid residue is then heated
strongly until there is no further change. 2)A mixture of sulphur
powder and liquid Y is heated for some time, with a little of bromine present as the catalyst, The. reaction mixture is.. then filtered and to: the filtrate is added a few drops of ncidified barium chloride solution, Question 12.
In the experiment as shown below lead(TT)} nitrate crystals" are
liquid X.
Fig. 3(e)
(a)Calculate
(1)
the upthrust on
the block in water,
(ii) the volume of
the block A, (iii)the relative
density of block A..
(iv) the upthrust of
heated in a pyrex test- tube. A liquid X and gas Y are obtained.
lead (IL) nitrate
heat
Liquid
'gas
freezing mixture (a)Name the substances.
X and Y respectively.
(b)A solid residue Z is
left behind, in the pyrex-tube at the end of the reaction. What is solid (c)rite an equation of the reaction when lead(II) nitrate is strongly heated. (d)Why is it not
desirable to prepare the liquid X by heating copper(II) "nitrate crystals?
is it desirable (e)Why
to collect the gas Y over water?
is found that solid Z is only sparingly soluble in dilute sulphuric acid or dilute hydrochloric acid but very soluble in dilute nitric acid. Why is this 30?
(g)A few drops of liquid
X is dissolved in
water.
of distilled
1)Would the pll of the
resulting solution
be greater or
depth
LAKE
Figure 4
5. In figure 5, a copper
block of mass 0.089 kg and an iron. block are connected by a light cord passing over va pulley and hang in equilibrium when both are completely immersed in water.
water
Figure 5.
Find the mass of the iron block.
(Relative density of copper-8.9 iron=7.8)
smaller than 7?': ii)What would be formed
in the solution? i)Write an equation
of the reaction on: dissolving liquid Xin water. iv)Give the oxidation number of nitrogen in the substances mentioned in (ii). (h)what would he formed on dissolving liquid X in some dilute
sodium hydroxide. solution? Give an equation of the reaction.
(1)What would be obtained
on heating solid Z with powdered charcoal? Give an equation of the reaction.
(3)If 560 cm
of gas Y measured at s.t.p. was obtained in the above experiment, what is the mass of
Lead(II) nitrate reacted?
..
(k)In general, the
nitrates are thermally unstable and will decompose readily on
heating. Name the
product(s) and give an equation of the reaction when the
following nitrates are separately heated.
1)Potassium nitrate
crystals ii)Zine(II) nitrate
crystals
ii)silver nitrate
crystals iv) Ammonium nitrate
crystals.
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頁 第張六第
日一十月十年子甲蕃
WAH KIU YAT PO