三第六第
日一十月四年巳乙
YAH KIU YAT PO
英中會考普通科學試題
PARTI (75 marks)
(4))
CANDIDATE'S NO.
A fens "L" with focal poin the object "O" On the diagram draw rays of light to find the Iposition of the immen.
red to give an image of
ALLthe questiona in Pars I. of the paper'must da angwered in the ipacar provided,
Chemicals symbuls and furmulio, maganly, de, usach in, equartierikan
in all other cases, chemical hames, must be written in fulfu
al Write wordseauations tu show the scibạn, cÇOISE DA
ammonium aitrate
用一廿月五年五六九一楼公年四十五國民基中
****
03
ammonium nitrato
ammonium chloride
Give one characteristic property for each of the three oxides nitrogen which you are familiar with:
Name of oxide
Ono characteristic property
Fin 11g5 h, the rays of night tervel in me directims shown." On each diagram or an outline of the glass olid which) would cause the rays to bend as shown
cand presi
The green plam illustrated above was kept in the dark for 24 hours in order to ...
... After enclosing one leaf in a bottle containing caustic soda to absorb the ............................ The plant was exposed to sunlight for 24 hours. At the end of this time the leaves marked A and B were plucked and put into boiling water for five minutes to kill their ..................
They were then transferred to a beaker of warm alcohol to dissolve the and were next washed in distilled water to remove the ... Finally the leaves were immersed in an jodine solution, sava
with lodine,
Leaf B gave
rith iodine. **
Leaf: A
[3)
What one property is common to all nitrates
[Charles' Law.states than
What is the difference between a colloidal colution End a suspension?!
What is the Tyndall Effect ? \
In what way is milk a colloidal solution? ¿
Define: solubility of a substance in water.
What are i hormones,
Hormones
enzymes?
Name two hormones and two enzymes, and say what each dogs.
Hormone
Function
Hormons
Functi
Archimedes' Principle states
Enzyme I
Name
(e)
Spesthe Gravity
IQFT
The solubility of copper sulphate at 85°C 18 60 gms, and at 15°C is 20 gms. What weight of copper, sulphate would be deposited when 120 gms. of saturated solution
cooled to 15°C?..
Calculations,
4FT
A uniform rod of length 10 ft
oded at the ends by
two spring balances "A" and "! 4ft from the end as in the diagr
The reading of balanes “A” ÄÙ
The reading of balance "8"
State an important property of silica, commercial use of it which sanondo na
Property:
When is wa
maation ca Ja pronartu.
The sketches below show a marble reiting (1) Inside a hemispherical bowl, til en a plane horizontal surfag, and iii) on the top of a hemispherical dume, Where the inable is in equilibriuns mane, thelond ui vamliorient in the sieces provided.
Why la water-glass used for preserving eksa?-
Tuu disadiamages of a Simple (Voltaic) Cejl are caused
at the positive pláte aṁm by
at the negdfis prarse Inorder 10 avald one of these disadvantages the mallku živciroda if a kectanche Cell in surrounded
Complete the following statement??
Glass is a mixture containing.
It is made by heating together
and
What do you understand by the "thermil process
Name
Function
Name four functions of the skeleton of the mammal
Give one function of the following parts of a leaft
Cuticle:
Stomata:
Intercellular spaces
(a)7 What
tare'
root hairs??
(b).
What are the two functions of root hairs?-
7
Two accumulature, each of E. M. F. & solte and of negligible') Maite Fiat Pušistanco, sro conneetod as in the diagramLE.
PART 1* (185 markul
Answer five questions only. Not more than jwo questions must be answered from any one section..
Use chemical equations wherever they serve to amplify your answers,
Section (Chemistry!
ΙΩ
(a)
Describe the laboratory preparation of dilute hydrogen peroxide.
What are the conditions(if any) for water LÀ, PAMÁS MIAMIZ sing, copper, potassium and magnesAMIN.
Conser
Laan ti
in fig. 1. the curram flowing thround the 3 ohmia raeistance.
amps.
In fig, th, the current flowing through the 2 ohma resistance)
amps,
Say what you would observe when hydrogen peroxide is added to
1. a filter paper stained with lead sulphide.
11. acidified ferrous sulphate delution
Hi, mangangae dickids
and explain your observations,»
Mention two household uses for hydrogen peroxide.
What is meant by "19 volume hydrogen peroxide"?
Palassium:
According to their rescuvity warn waterjet rangware Eder metals in their correct order in the “acivity s0 F¥$__
The diegrain alsowe a'd' strike Internat cumbustion engine. The stroke illustrated 10 the diagram le call the stroke, "In this engine heat chargy from combustion of the fuel is converted lo mechanical energy.
What kansld be used in tunte`re |
mwi Radicar energy-lu L'ÉVA
electrical energy to mechanical
(a) [Defines]
(a)
\1. equivalent weight of an element
Hi, equivalent of an acid,
Describe, with all experimental details, how you would) determine the equivalent weight of magnesium" by the process of direct oxidation,
On treating x grams of magnesium with hydrochloric acid, ces of hydrogen at N, T, P. ware collected. Calculate
the equivalent weight of magnesium in terms of "x" and "y"! (1. Utre of bydrogen at N. T. P. weighs 0,09 gina), /^
The molecular weight of sodium carbonate is 106 and walphuric acid to 98. Calculate the equivalent of the carbonat de··
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