1983-09-23 — Page 20

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