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UNIVERSITY OF BATH
STUDENTS UNION
CHINESE SOCIETY
ENGLAND
英國巴夫大學
語·酒
華僑教育
英國教育大型展覽
1987中學會考 試題預習專欄
化學(十九)
明池出版社
MILL-EDALE PRESS
Revision Exercises.
for
Cert. Exam. (1987)
CHEMISTRY (19) Question 28
In the experiment as shown below, a stream of dry ansonia: gas was passed slowly over: some heated copper(11) oxide and a gos X was obtained, which was then passed over some magnesian powderát Ted-hot.
A copper(II)
oxide
Blow
stream of dry
hcot
ammonia
gas Bagnesium
powder
hêst
3.to
Filter
cope pump sulphuris ☺acide
B
(1) Name the gas X-
(ii) At the end of the. experiment, a
reddish-brown. powiter X was obtained in tabe A and a pale-yellow solid Z obtained in tabe C.
1987中學會考
試題預習 專欄
names
(1)Give the
of X and Z respectively
(2)Write the
equations of
their respective formation.
(iii)State TWO-functions of the concentrated sulphuric acid in
the tube B
(iv) When the solid Yis treated with water:
a white elid P and
a colourless, pungent gas Q
are obtained as the products.
(1)Give the names
of the solid P and the gos. Q' respectively. (2)Write the
equation of the reaction. T
(v) What mans of solid Y would be obtained on reacting completely 1:54 g of magnesium powderum (vi) The amount of solis
Y obtained in (v) is then boiled with water t
(1)What pass of the
white solid P
would be
obtained-
(2)What volume of
gas Q, measured
at step. would be formed?
(vi)If a piece magnesíum
ribbon is burned in
air and drops of water are added to the hot residue, a peice of moist PH paper held above it will turn hlue. Explain this
observation, briefly.
(b)How would you
distinguish between carbon and copper(II) oxide (both of which are black powder) by applying the following TWO tests to each of the substances? Describe what would you observo in both tests with each substance. If a gas is produced you must describe how could you identify it? (i) Heating each in a
current of air.mus (ii)Warming each with.
some dilute bydrochloric acid. Question 29 J (a)Some information about
(i)
five elements lettered with T, W, X, Y and Z. (which are not the chemical symbols of
the elements) is given below.
Electronic
Atomic.
Element
Mass
number.
gumber:
configu-
ration
4.
2:3
2.8.1
2.8.5
18
40
1.8.8
Give the letter of the element which BEST fits the
(B) Refraction
(A) Reflection,
"Deep watej
物理(十九 )
region
明通出版社
incident wavefronts
incident
zeflected
MILL & DALE PRESS
Revision Exercises
for
Cert. Exam. (1987).
PHYSICS (19.)'.
5.3 Water wavea and ripple
tank
Proments..
of waves,
(a) Straight vaves.
Note: angle of incidence iangle of
reflection or
circular reflector
reflected:
1. frequency
remaïïs,
unchanged
2. Let V. velocity.
(b) Cires
straight vaver
circular
wave
wavefronta
incident
wavefronta
reflected
wavefronta
incident
wavefronts
circular
reflector
Diffracted
wavefronts
Notë
Diffraction
incident
frentel
OË WATE
in deep
vater
region velocity
of Vave in
shallow
water region
The width of the
opening should be
the same order es that of the wave- length of the incident wave,
(p) Interference
description
below. (1)The one which is
a strong reducing agent.
(2) The one which can
be described as inert.
(3)The one which contains 5 neutroua in ita necleus. (4)The one which
consists of monatomic
molecules.
(i) What is the formula
of a compound formed between the elementa X and Y? (iii)Element Ý can
combine separately with elements X and Yto form the compounds P and
Q respectively. (1)State the type of the chemical bond in the compounds. P and Q
respectively, (2)Draw diagrams
to show the electronic structures of.
P. and Q respectively. (3)Which one of P
and 4 would have
a relatively Jower melting point? Explain briefly,
(4)Which one of P.
and Q, in, liquid state, would conduct. electricáty? Explain briefly: iv) Elements X and Y are: both solide at rooƏLİ temperature, but X has a relatively
Condition for constructive, inter- ference.
path difference -
where m 0, 1,
Condition that
destructive inter- ference,
path difference
where
0, 1, 2, 3,
Note: 1. If the frequency
remains unchanged and the distance
between S and S2
is moved (a)nearer:
then, the separation between two maximum received when travelling along the line XY will be larger. (b)further apart:
then, the eparation" will be smaller.
ff the frequency.
is increased,
then the
"separatien“
will be smaller.
經濟(十九)
明德出版社
MILL & DALE PRESS.
Revision Exercises
for
Cert. Exam. (1987)
ECONOMICS (19)
higher melting point than Y does. Explain why this isão.
(b)Give an explanation to each of the following: statements.
(1) Elements in the same
group of the
Periodic Table very often reast in aimilar ways.. (ii) when ammenia gas is passed into an aqueous solution of hydrogen chloride, there is no obvious" change. However, a. white precipitate is observed on passing ammonia gas. into a solution of bydragen: chloride' in dry methylbentene. (iii)The pH of distilled
water changes when. hydrogen chloride gas is dissolved. in it. NORT (iv) Ethane and ethene
are both
hydrocarbons, but they differ in many aspects in, their chemical reactions.
Question 30, 2 (a)In the experiment
below a mixture of " copper turnings and concentrated. sulphurie acid in a pyrex test- tube "A was heated strongly but
carefully. Any gas liberated vas directed into another test-tube B containing a liquid
(i) white powder vas
formed in tube. A. What is it? (11) What is the gas X?
The Stock Exchange.
á stock exchange forms a part of the financial market. It is a place vhere dealings in securities take place, that is, a market where those desiring to buy existing securities are. brought into contact with those who want to sell. A stock exchange has a limited membership. Since only members are permitted to conduct business on tråding of securities in- the exchange, others want to buy or sell in this way must employ members to act on their behalf. Regulations. regarding stock exchanges ensure that a well run and regulated stock exchange will perform its functiona smoothly.
1. Describe the economic functions; of: stock exchanges.
Stock exchange. provides chances of investment for the general public. It helps to mobilize the idle savings of the community to those firms which seek to put them to productive uses. Through the facilities of the. exchange, numerous small sums of money can be pooled together to finance high projects which are beneficial to the
community, Stock exchanges make it ponsible for an ovner
of securities to dispose of them if he
so desires or to
convert his securities. into cash when necessary. Stock exchanges assist the capital market by: making securities more liquid and in this way encourage people to invest in them.
Stock markets also a meane to profit making. They offers constant opportunities for the investors to
are
Write an equation of its formation. (i)if Yis the
distilled water, would the pH value of the resulting solution be smaller.
7? or greater than
gaBX tube λ
conc sulphuric acid copper turnings ↑
tube
liquid Y
(iv) Describe what would you observe in each of the following. cases,
(x)
(1) is the
acidified
potassium dichromate
solution.
(2)Y-is the
concentrated nitric acid. (5)Y is the neutral
barium chloride solution.
(4)Y is the aqueous
bromine solution, Give the equations of the reactions, la (2), (3), and (4) respectively.
It is found that an aqueous, solùtion of sodium sulphite gives similar changes as the gas X dia în (fil)... Explain briefly why this is so.. (vi) If the residue in
tube A is carefully poured, witậ stirring, into the water in a beaker a coloured solution 18 obtained. What is the colour of the
moke profits in the form of dividends or price gains. They can also provide capital: for the government. By issuing bonds for eale in the stock exchange," the government can raise funds for "it's projects. e.g. for construction of the mese transit railway Often, the turnover of the stock exchange indicates to some extent the performance of an economy. In addition; competition between numerous buyers and sellers in a free market will help to determine the credit rating which an enterprise deserves, so that the more. efficient and promising enterprises can raise capital more readily and pay a lower rate of interest. than the less
efficient enterprises, Furthermore, stock exchanges can ensure the efficient use of Ioanable funds by those firms which are more competitive and efficient in their business. It is because investors usually put their money capital in those businessen which are
high-yielding.
The Currency System of Hong Kong
In Hong Kong, coins of $1000 (gold coins), $5, 62, 81, 50 centa, 20 cents, 10 cents and 5 centa and currency notes of 1 cent denomination. are issued by the govern ment, Coins are normally. used in smaller transac- tions. The major part (95%) of the total amount of currency in Hong Kong consists of bank notes issued by two commercial bunks under the authority of the government the Hong Kong and Shanghai Banking Corporation and the Chartered Bank. The Banknotes (paper money):
20
solution?
Solution A 18: obînined by
dissolving 2.0 g of sodium hydroxide in water, which ịa then made up to 250 cm2. What is its molarity?
(ii) solution Bis
obtained by dissolving 2.45 g of sulphuric acid in water, which is then diluted to
250 cm2. what is its molarity?
(iii)25 cm3 of solution
A is slowly added into a beaker enntaining: 25 cm of solution. B
(1)What would happen
to the pl of the. solution in the beaker during the múdition of the solution Ä into: it?
(2)A salt is usually
obtained on
mixing as acid with a base. What ia the name of
the salt X thus obtained in the above experiment?
What is the molarity of the selation with respect to the Ball X?.
(iv) What would be
obtained on mixing 20 cm of solution A with 10 cm3 of solution BY
are of $1000, $500, $100, $50, $20, $10 and the value of these banknotes ia fully backed by the Exchange Fund. Both the. coins and the banknotes are legal tender in Han Kong while the i cent notes are legal tender. only for payment of any amount not exceeding one dollar.
In Hong Kong all banks are required to act according to the provisions in the Banking Ordinance.
Outline the gain effects
Аколоза аца, по
of a rise in bank interest rates on
Loans and deposita.
Arise in bank interest rates on loans and deposits will probably have the fulloving main effects: (1)loans vill be murE
expensive, end individuala and businessmen will then. be less interested in ̈ borrowing money from bankaj thua învestment will slow down and
decrease (2)Consumera' demand will also fall as they will borrow less to purchase property, car etc; (3)production costa will
be higher because of the higher interests on loans, (4)export prices will
rise and exporte will drops as they become less competitive in overseas markets; (5)foreign capital will
be induced to Hong Kong while local capital le attracted" to stay
(6)there will be more
deposits in local banks; per (7)the growth of economy and transactions will slow down because of declining investment and consumption; (8)the prices of stocks
and shares may fall and speculation in the Stack Exchange will be lesa,
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