報日僑華
頁四第張五第2日七十月八年亥癸歷夏
WAH KIU YAT PO
he bone.
1984
range the
elements
五期星
symobls of hydrogen, (c) Give a reason why oxygen and sodium: respectively.
solid B was
中學會考試題預習專欄
化墨
明德出版社 朱宏林提供資料
Chemistry: (1)
Reginald W. Chu
MILL & DALE PRESS. LTD.
Question 1
Partofthe Periodic Table is shown below⠀⠀⠀ with some of the first twenty elements being: represented by letters: which are not the chemical symbols of the elements.
Calde
fb
xi w
A
e
(a) Give ne letter of
the element
(i) which 'consists of
monatomic molecules; (ii)which is the
atrongest reducing
the
agent among elements shown;
(iii)which is the best
electron acceptor among the elements shown:
(iv) which consiata of
a giant covalent lattice of atoma?
Give the name
8
of
the family to which
b
the elements ar and c belong;
(ii)the family to which
elements x and
the
a, b and c, in the order of decreasing
metallic character
(d) Why do the elementa
a, b and c, being
placed in the same vertical column, show similar
chemical properties?
(e) The element y can
combine separately
with the elements b ande to
compounds-P′ Gng respectively,
(1) Using Die untermust
shell only, draw diagrams to show electronic.
structures of P and
Q. (ii)Explain why. Pis a
solid but ų a liquid at room temperature and pressure. iii)Explain briefly why
in liquid state P can conduct elec- tricity while Q cannot do so. (f) Using the letters
only, give the formula of the compound formed by the elements
(1)d and f (ii)g and b
What is the
oxidation number. the element:
the following) compounds of y,
in
where II, 0 and Na
are the chemical
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(1) HO;
(2) Nay Us?
What is the change in the oxidation number of y in coverting Il to
HU oxidized.
reduced in the
process in (ii)? Why?
experiment as ghown below, the colour-- less gus A, formed by action of. concentrated sulphuric acid on sodium chloride crystals, was passed over a hot iron coil. After some while; a solid B was obtained and,a colourless gus C collected, which could: form an explosive: mixture with air.
cone, HiS.
iron coil solid B
(a) Identity and name
the substances A, B and C respectively. Give: an equation for:
(i) the formation of..
gas A::
(ii)the reaction between.
gas A and the iron. coil.
collected at the place as shown, but not near or on the iron coil.
(d) What would you
observe when a piece of pH paper is moistened with the: water.in the troughi at the end of the. experiment? Explain briefly your answer! (e) A pale-green
solution D·was obtained:un dissolving some of the solid B in water.
(i) What chemical
species was responsible for the colour of the solution:D? (ii)What would you:
observe on passing an excess of chlorine gas into. the solution D? Explain. briefly: your observation, giving an ionic equation of the change(s) observed. Tf/1.27g of solid B was obtained at the
end of the experiment, what would be the theoretical volume
of gas C collected measured. at s.t.
s in the gas jar?
(g) What would be.
collected over water in the gas-jar if the iron coil was
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substituted, in
pati
turn, by
(i) zinc powder;
(ii)copper coil?
If there is a reaction: give an equation of 'the reaction. Tf there
is NO reaction, explain briefly.
Question 3
A colourless liquid X boils at 46 C and one atauspheric. pressure, and burng readily in air. On analysis it is found to consist of 15.8% of carbon and 84.2% of sulphur by mass. **: C=12, S-32)
(i) Calculate the
empirical formula. of X. (ii)It is found the
0.38 g of X, when vaporized, occupies.
a volume of 448 cm at s.t.p. What its molecular formula?
)Give an equation. of the complete. combustion of Xin
air
When 2.11 g of liquid X is completely burnt in:
1000 cm3 of oxygen,
what would be the change in the volume? (All: volumes of gases are measured at the same pressure and
temperature.)
A solution X is made by dissolving dry
hydrogen chloride
gas in water while a solution Yis made
by dissolving dry:
hydrogen chloride in dry methylbenzene. State the
e type of bond present in hydrogen chloride. (ii)Draw a diagram to
show: the electronic structure of hydrogen chloride. (iii)Solution X turns:
the pil.paper red while golution. Y does not. Explain why this is 80. (iv) what would you.
observe on passing dry ammonia gas. separately into the solutions K. and Y? Explain briefly your observation. (v) Solutions X and Y
are placed in turn in the beaker as shown below.
∙battery.
bulb
•beaker
·Solution
1) The bulb gives light
only when solution. K is put in the beaker. Explain briefly.
(2) What would be formed
at the cathode and anode respectively
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on -passing a current. concentra- through a
ted solution of X
in the above set-up?
Give ionic equations of the reactions at the electrodes.
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育體僑華頁一第張六第日七十月八年亥癸曆夏