of the
BAKA
MILL & DALE PRESS
substituted in turn, by
(i) copper powder; (ii)carbon powder? If there was in reaction, give an equation of the reaction. If there was no reaction, state sa.
育教僑華
above experiment?
(g) white powder is left
as: the residue in
the test tube A at
the end of the experiment.
(i) What is the white
powder?
(ii)What would you'
頁二第張六第 日三廿月八年卯丁曆夏
WAH KIU YAT PO
報日僑華
四期星
日五十月十年七八九一曆公年六十七國民華中
position of the
object.
1988中學會考
(1) > 21
試題預習專欄
object
image
21
2F
物理(三)
lens
(ii) u=21
JA
明繿出版社
MILL & DALE PRESS
Revision Exercises
for
u > 2% <v <2f } real
v=21*
£<u<21 v>21
inverted
inverted
inverted
virtual
DO A
Теп
()=A
u<f
erect
concave
virtual, diminahed, erect
lene
focal length
60..cm.
(a) Pind, by
constructing
ray disgram.
(i) the posi-
tion of
化學(三)
the image.
(ii) the size
for
Solutions:
(a.)
(iii) f«u<2f
object
F
2F
Cert. Exam. 1988)
inege
lens
PHYSICS (3)
1.3 Lenses
(A) Convex lens
object
(converging lens)
2F F
P 2F
image
lena
(Focus)
K-1 →→→
(B) Concave lens
(diverging lens)
Rules for drawing ray diagrams.
1. Rays párallel to the
principal axis are refracted through the focus for convex
(converging) lenses,
and appeared to
diverge from the focus
for concave (diverging) lene
2. Rays through the
optical centre are undiviated
3. Rays through the
principal focus emerge parallel to the
principal axis for
converging lenses. Haya pointing to the principal focus on the
other side energe
-parellal, tg, the_..
principal axis for
diverging lenses;
Ray Diagrams
(A) Convex lens
The nature of the image formed by a
conve
lens vary with
difference in
{is) uy
object
श्र
image o't o
(v) u<f
lens
lens
(B) Concave lens
image
object
P
20
object
image
lena
The properties of the
images formed:
at one point
the same
magnified
| diminished ...
magnified
Qoo
72-1
convex
lecs
Example: An object of
Solutions:
height 1 cm in placed 30 ca io.
front of a
convex lens L of
focal length
20 cm. Find, by
constructing ray diagram,
(a) the position of the image so formed,
(b)(i) the size
of the image.
(i)
(ii)the magni-
fication.
(ii)
(c) If now a
lens L
placed
is
between the object and
the convex lena L, what kind of lens
L1 is?
(a) As shown in the
figure, AB reprezenta the object and A1Ð' the image no formed
The image is at a position 60 cm from the lens,
(i) the size of the image so formed is 2 c & (ii)magnification:
size of image. size of object 20 10
(c) Lust be a diver
ging lens (or a concave lens).
Example: An object of
height
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新營學校及数
placed 20 cm in front of
concave lens of:
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image.
(iii) the
magnífica- tion.
(b) State the
nature of the image so
formed.
As shown in the diagram, AB repre- sents the object
and A'B' the image.
the image is
at a distance 30 em from the lens.
The image and the object are on
the
same side of the lena.
Size of the image -6 cm (iii) magnification,
#--1.5
(b) The image is virtual,
erect and magnified.
Example: An object of size
6 cm is placed
30 cm in front of a concave lens of focal length 60 cm. pina by
ses constructing
gay diagram (a) the position of
the image, and
(b) the magnifica-
tion,
(c) State the nature
of the image.
Solutions:
() As shown in the
diagram, the image is at a distance 20 cm from the lens |(b) magnifigationTM
size of images size of object
(-0.6667)
(c) The image is virtual, erect and diminished.
Revision Exercises
Cert. Exam. (1988)
CHEMISTRY (3)
Question 4
In the experiment as shown below the gas A, obtained by the action of concentrated hydro- chloric acid on potassium permanganate crystals, was passed over some heated iron filings and a black solid B was collected.
drying
Cone. Helbulb
Iron
Soda
Line
¥ Buð
USB heat
cone.
receiver Salid
2010
Crystals
KMnO,
(a) Identify and name
the substances A and B.
(b) Give an equation for the formation of gas Ai
the formation of solid B,
respectively.
State the purpose of passing tlie pas A successively through (i) water
(ii)conc. H, SO
What is the 1ime2
(li)State two functione of connecting a drying bulb con- taining soda, lime to the receiver? (e) It was found that 3,25 g of solid B was obtained in the above experiment In |*(1) What van the mast.
01 iron reacted? (ii)What was the volume
reacted of gas
measured at sit.
(1) Would there by any- reaction if thi
filings
experiment
加拿大溫哥華·艾爾華預科部
ALPHA
COLLEGE
500 West 65th Avenue, Vancouver,
Brhish Columbia, Canada V6P 268
‧本校為加拿大BC省政府難下中學,位於設齊全 之政府公立校舍,全部教科書由教育部免費供應。
校宿舍马加拿大移民局指定爲入住學生之合法監
生辦理一切入學及簽征手績 兼接機服務。
寄子家長,使家長獲知學生的
F4學生可於一年内完成
歡迎F.6及F.7學生申請 可直升美加大學二年级。
() Name the substance(s)
that would be obtain ed and write an
equation of the reaction, if any, when gas A is passed separately into
(i) cold dilute potensium
hydroxide solution; (11)bot concentrated sodium hydroxide solution.
Question 5
In the experiment as shown below the gas X evolved from tube A is passed into a liquid Y in the test-tube B.
test- tube
A
copper
turning
gan X
Conc.
Ho$0
testm tube B
Liquid ř.
(s) Name the gas X. (b) Write an equation of
the formation of gas X.
(e) A solution W is
obtained when liquid
Y is the distilled water.
(1) Would the pH of the
solution W be
greater or 'amaller than 7?
(ii)What ions would be present in the solution W?
(d) Describe what would
you observe when the following liquids. are place, in turn, in the test tube B. (1) Acidified potassium
dichronate;
(Li)Bromine water; (iii)Aqueous barium
chloride solution; (iv) A saturated aqueous
solution.of
hydrogen sulphide.
Write the equation
of the reactions in (ii), (iii) and (iv) respectively,
What would happen if gus X is passed over heated--lead{ TV). oxide? Give an ... equation of the reaction, any
(1) Is it necessary to
heat the mixture of copper turnings and concentrated:
sulphuric acid in the
膑百囘14
*份收的年
月生只
開會
始於决
問卷調查,由於問卷回收率過低,缺乏代表性
一而被迫放棄,學生會將於十二月再進行另一次
ERSEPRE
今年四月及十二月期進行兩次發學院
部問 理學
observe on poúring the residua into a beaker half-full of water with stirring? (h) Would there be any
gas X produced if copper is substituted, in turn, by
(i) lead; (ii)zine?
If there is no reaction, state so and explain briefly. If there is a reaction write an equation of the reaction.
Question 6
(a) Metal X is Group II
of the Periodic Table. 0.24 g of X
is completely
dissolved in 50 cm2
3
of 0.5 M bydrochloric acid to give its chloride, The resulting solution is then diluted to
3
250 cm3 and 50 cm? of the diluted solution requires
25 cm of 0.02 M sodium carbonate solution for complete
neutralization.
(i) Write the equations
of the reactions involved.
(ii)Calculate the
relative atomic mass of the metal, X.
(b) What would you
observe in each of the following cases? Write an equation of
each of the reactions that might have taken place.
(i) Chlorine gas is
passed for a short while into an aqueous solution of potassium iodide. A few drops ofv starch solution is then added sjeldn (ii)Silver nitrate an
solution, acidified with dilute nitric ecid, in added into an aqueous solution. Caf sodium chlorider
An excene o ammonia solutionží s added into an
aqueous solution o sodian chlorides An excess of sumonia solution, is the added into the resulting mixture.
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YAMAHA 1887 1987
級:幼稚園各班(上、下午班,全日班)、
到處風骨資助:
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334至346號地下
教學評核問卷調査
HORI
,並包括最行公開美座 就很畫作出全面性的分此亦有助向學關注切身利短的第一步、菜
是項波動的意義何在。 KEJEDRKSH 學生會與各系畫的聯繫
安格:中大畢業或同等程度,香港高考英文科合格亦可。 有力阻件可查參考。林業期間可根據和别過度而延无柱短 本科兩年,棠,任尼一百四十分省提的NB 本院文进獲得在只部份大手于绍,亦可在英國戰各地大學深造新中 英语系国拽科招生(章程備案)、
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