六期惠
日八月六年八六九一层公年七十五國民際中
IT EN HE
英中會考數學(-)試題
HONG. CŨNG
CERTIFICATE OF EDUCATION EXAMINATION (ENGLISH)
1968
第三强六 第
日三十月五年申戊歷夏
WAH KIU ÝAT PO
雜
B
英中會考化學科試題
HUNG 3 KING
当你
Using the paraffine an examples, show FQUE characterience of a homologous
CERTIFICATE OF EDUCATION EXAMINATION (ENGLISH)
series.
1
1968
(6:
р
fci
Yd:
/CARMISTRY
Time allowed. Two houra and thirty minutes".
SECTION A 180 merics) *
gandidate No.
Answer ALL che questions in the spaces provided. 7 Chemical symbole are permitted
only in equations.,
(
Name
tal
rum gases that support the campusison of Aˆcenaika
[
bi
Thin aride char de soi eneLJAN OXYGEN
£17
(cl
Fun reducing agents that cuntain heygen
1+ 1
+k
fwn medining ngemim chai 10 01 Contain negen
וי}
fr
Two elements that exhib asjatrodys
Write chemical equations to show the following rea
2
ca
Boil eulphus in concent
Sulphur ACA
Place heated lean droxide IND
* of sulphur IOKIHA
(C)
Page chinrine gas 10 enla
<d)
Heat calcium nitrave strongly
omplete and balance the following equations:-
e)
12. (a)
8*T MnO •
Fo
Mno
C1
Mr
MA
Gly
espace drovided below, draw a diagram to illustrate the atomid sttucture of each of the atoma named.
"Oxigen atom
Carbon atom"
(5)
Compiere the following stelementa:•`
Isotopes are atoms of an element which
The atomic number of an element is
Gol The tomic weight scale is orawn up basing on
I MATHEMATICS.
Syllabu
A
PAPER.
Arithmetic apa J
TrigonomPCE Y1
Time alloweɑ · Two moura
Candidple tra
Atemp ALL queestone in Sections A and any FOUR questions in Section &
Answers should be given in their mooples', Mathematical cables will be provided
form
SECTION_A 10 markal
Credit will only be given for the correct answer. provided of the question paper
Put each answer in the frac
Any working required may be done on the last fea
dages of the antwer book but will not be marked,
L. 12 marka
Exprese 5.45498 correct in 3 significant figures.
Answer:
macke}
Simplify
1층
K
•
alandaro,
5
12 Mark)
13. The solubility el cubstanit at 20°C. 19 And to to 2% EMAI00 es varer.
What weight of the substance 15 present in 100 grams of ls saturated &nloh54
• 20" C }
Fien the value of 31243.
14
12 marke
Calendar
14. State THREE differences between esterification and neutralisation,
(a)
(b)
(c)
Complete the following statements:-
3.
(a)
During the extraction di can fanm its ore, limestone is added to the blast Jurnace'in nyder to
(6)
Oxygen is manufactured by
15. Select from the following list of substances only
Bodium, hydrogen sulphide, sulphur dioxide, sodium hydroxide, methyl alcohol.
(a)
Two substances which react to give a gas with reducing properties:
fil
(ii
(2)
Two substances which react to gave a salt with reducing properties;
(1)
Tof
The simple chemicki compound used to remove oermanent
water js
·
Answer.
F62:་༤nrtéi ue \ pvcn¥(vརྔུཎྜ#x F1¢ur*#;Y
Answer.
From a four-figure table. cean difference for 29.
For $300 in 1954 and the corresponding What If the value of col 51 32' ?
Answer
1 mark=}
Express 135* ip radianG
giving your answer
in terms of
Answer
13
market
.
radians
Pleser WEEK OVERI
How
MI Chan sends HK$1,000 from Hong Kong to Mr. Lee in London, much ones Mr. Lee receive in pounds, shillings and pence to the nearest Bixpence it the rate of exchange, including all charges, is HK$ 14. 70 to the Poung ›
Answer I
(i)
(c) Two stances which reacti
(i)
an element whewech bits allotropy
(3 marks
SECTION B 1100
and
Find without wing tables the value of sin 35 tan 55* eet 357
Answer:
Solder is an alloy of '01
(1)
ziel
Straw hats, silk and paper gradually turn yellow because
{0}*** Qefine a Faraday
What weight of copper will be liberated from a copper sulphate solution quantity of electricny that sets free 2 grams of oxveen? (0 = 16; đũ
5) Outline the steps to prepare pore samples oft-
21. Sodium sulphite from sodium hydroxide solution and sulphur dioxide cáz)
tal.
(a)
bi
Leical equati
8.
(22 mark)
<
K sin B ·
and the measure of an obrus angle, find tan 8,
Answer
swer FOUR queglane only. Each carries 30 marks. nitructural formsflze where appropriate. Name the organic Demmpound as tørre awed by each structural formula.
445)
(iv)
Cupric oxide (rom copper sulphate and sodium-hydroxide soluti
U 1
'
(a)
How would you show whether a sample of ethyl alcohol contains water?
How would you find out if a solution of sak X is unsaturated or supersaturated ?
What Would you observe when:~
C135, 5
H, C=12, 016. Na = 23, Mg 24. S = 32. When 6.9 grams of an inflammable organic compound X were burntal excess oxygen, 13.2 grams of carbon dioxide and B, 1 grams of wate were obtained as the only products. From this calculate the empçal formula of X
Compound X. reacts with phosphorus pentachloride to give a colourless steamy ga G which fumes profusely with ammonia. On prolonged boiling with chromic acid, X gives a substance Y which also reacts with phosphorus pentachloride to give the same colourless, steamy gan G. When X is heated with concentrated sulphuric acid to 170°C or a little above this temperature. a colourless gas Z is produced, 2 decolourizes bromine
Z has a water but has no reaction with ammoniacal cuprous chloride, vapor density of 14.
Name, giving structural formulae where appropriate, zne substances, G. X, Y and Z and write equations for all reactions involved..
The two chlorides of a certain metal contain 4.1% and 34. 45% of the metal respectively. Use šī figures to illustrate a law in chemistry and state this law,
You are given THREE aqueous solėkions, each of which contain one solute: only. When a drop ol C is added to B, a white precipitate is formed which dissolves when excess of C is added. When C is added to A, a greenish precipitate is formed which turns brown gradually on alending. With barum nitrate solution, A gives a white precipitate insoluble in acta, When A and B are mixed, there is apparent change, but when concen- trated sulphuric acid is run slowly down the side of the test tube containing the mixture of and B, a brown sastance is seen to form where the
When C15 evapor- concentrated sulphuric acid meets the mixed solution.
.
(3 marks)
Row.much wil) $3,200 amount to in 3 months at 3% per annum "
kai
1 the average of the five numbers
(3 marks)
642956
642975, {
642921
642992 and 642986.
Answer
Answer:
lf pound in equivalent to 12 taeis, how many catties are chefe in7
I byndredweight?
+ 20% smaller than y
as a % of y.
Answer:
and
18 20% greater than
Anaver.in
ST
Find the value of
ein v
cow '4 tan
Anewar:
(conc* - ') can2 )
Answer:
IBRARIES
ated there is no residue. When spd.um bicarbonate solution is added to B. a white precipitate is formed. When this is washed, filtered and #trongly heated, the residue is yellow but turns white on cooling. Name the solutes in solutions A, B and G and write equations for all reactions mentioned above, except when concentrated sulphuric acid is added to a mixture of A and B. (Description of the reactions is nat required).
KON
(a)
+
Chlorine gas ta bubbled through potassium iodide solution then followed by addition of carbon tetrachloride.
(b)
Freshly prepared concentrated nitric acid is poured on hat sawdust.
Suggest how you would obtain:
specimen of crystalline ferric chloride from terrous
oge gaa rom ammonium nitrate,
PEIC
ixed win 70 .c. of
Whee 15, of a gastou hydroch hon is were oxygen lan exces and ited indea graduated tube in the oresence of concentrated sulphuric acid theme of the residual gas war 47.5 c. c.
All This was reduced to 17.5 .. by treatment with caustic potash. volumes were measured under the same conditions of temperature änd pressure. Find the molecular formula of the hydrocarbon H. name and structure.
Cive 113
14. (3 marks)
Simplify
15. (3 marks]
If the angle of The shadow of a vertical pole on level ground 19 10 E. elevation of the sun is 32, find the height of the pole to the nearest inch.
Answer:
SECTION 8 (60 marks)
Marka will
Do any FOUR questions. All necessary working must be clearly shown.
Start a Re question ou a new be deducted for the pour presentation of material.
page.
What is
16. (1) The difference between the simple interent and the compound roterest en a
sum of money invested for two years at 4% per annum 18 $40, the sum of money"
(
State briefly, without giving equations, how you would obtain:
enangane se dioxide from a mixture of manganese oxide and Cupric oxide,
(11)
magnesium hydroxide from a mixture of magnestum hydroxide and aluminium hydroxide.
17
(c)
State briefly, without giving equations, how you would distinguish -
Hydrogen sulphide gas in bubbled through an goldified solution of potassium permanganate.
between'
(d)
Metallic andium is added to ethyl alcohol.
43 methane and carbon monoxide;
(11)
sodium carbonate and sodium bicarbonate,
•
เข
Omising technical details
outline the manufacture
of and carbonat▸
by the Solvay Process.”
18. (1)
Thi
Cammen on the statemen The Solvay Praceab in an excelleni ilustration or an induBlesal operation in which waste in lept to a mimmun
(c)
By means of a large labelled diagram mậy, show how sulphur dioxide is converted into auļphur trioxide in the laboratory
141
1.
Under fine the term or phrase that begi completes the statemen) or answers the QUEBETON;
A sample of cancemraved sulphuric acid has a specific gravity of 1, 85 and contains 91, 77% by weight of sulphuric acid
Calculate
tai
A sodium ton sè different from a sodium atom because the 400ium 100 () is neutral, tiil reacts with water. Hill) carries one onsitive charge, (iv) carries one negative charge.
T How many mi. of this acid sample are required co prepare
une intre of 0, 1 sulphuric acid
th)
When ammonia reacts with chlorine, the ammonia is oi reduced. (i) oxided (ii) neutralised, (iv) displaced.
052 gram of a sample of magnesium oxide containing immunstres when no The 011 27 N sulphuric seid. not react with the lat, was heated with 40 mi excess acid required 23, 16 må, of 0.18 N sodium hydroxide solution for complete neutralization" Calculate
20. (1)
441 the normality of the concentrated sulphuric acid sample.
Messrs. Chan, Lee and Ho invest $80,000, $10.000 and $110.000
o 20% of the groas respectively in a business. The expenses amount profit which is $25,000. Mr. Chan, being the manager, gets L6% of the net profit, and the remainder is distributed among the three in proportion to these investments How much of the profit does each receive?
inree cyclists passed the starting fine at the same time to traves in the
If they travel same direction round a circular track of length 1, 200 feet. round the track with uniform spesús of 15, 20 and 22 feet per second respectively, after how long will they be all together again?
The distance from the sun to the earth is approximately 93 million miles.
now long does it if the speed of light is 300 million metres per second take the light to travel from the sun to the earth? Take i mere to be $9.4 inches,
n hemisphere of radius 4. 00 cm. is made of steel with the density of
(Take to be 3. 1421. 8. 19 gons per .c. Find the weight of the solid.
The
A rectangular swimming pool is 25 yards long and 10 yards witte. bottom sloped at an angle of 5 to the horizontal and the depth of water at the shallow and la 3 ft. What is the volume of water in the opo
19. The angle of elevation of the top of a vertical flagstaff from each of the two pointa, A and B, on horizontal ground, is 30, and that from C, the mid-paint of AB.
If A and B are 100 ft. apart, find the height of the flagstaff in feat.
18 45.
1
Please turn over.
At two points A and B on a circle. cangente are drawn whien muret arm, APB 165 and the innuth of the intnor Drc AB i 2 inches (indi the radius of the circle.
Take m to ha i 147 or PRVA 175g to be a 49717
Calcuları
(is! A village P in 'due east of another village Randy's 20 0-miles from it.
A third village Q la N. N, E. of R and is 24.0 miles tram le the distance between P and Q.
1
Draw the grapn as
between " and 8" by Lines Feaching
he remaining vatues of # in the following tablę •
Sodium hydroxide 18 manufactured by (l) electrolysis of brine garng a platinum.cathode. th electrolysis of brine using a mercury cathode ftis,efectrolysis of sodium sulphate using a platinum cathode.
fysia of sodium sulphare daing a mercury cathode.
til concentrated sulonise
il calcium
Idi
The most suitable drying agent for ammonia 18 acid,
in phosphorus pentoxide fill calcium Hydrokide.
oxide.
电产
Zinc oxide in fil a basic oxide, (ii) an acidic oxide, his) en amphote res oxide Tivi a peroxide.
Give THREE chemical properties to illustrate the ract they dolas occupies a very high position in the metal activity series.
11) the volume of 1. 29 N sài phúció acid required to react with the
sample ui magnesium oxide.
113
P
the percentage by weighwbi pure magnesium axide in the original sample.
Describe how you would:
R
*
5 10
1.5
131 Gad the boiling point of pure liquid.
la tiquío useful?
to what way is the boiling point
tan x
3.09
1
How would, you khow by means of a simple "chemical réaction that zinc şa mora aleutropositive than lead?
(*) whow that doring combustion of phosphorus. very nearly 1/5 of al
kured up.
443 obsen a crystalline sample of copper sulphate from copper warnings and
sancemtrated aulphuric acid:
(67 deliver 25 ml of a given solution with the use of a pipetie,
Labelled diagrams are required lov jaj and ibi only.
cox
*
0. 18 0,27.10.3
11 435 6713.3 E 25 244
1.525.85 4 005 07
What is the least value of "
By adding a straight line graph spice the squation
• co ***
47 29 35
34 0.0
45
is
55
70
25
AD
85
26)
2.13
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