真四第張七第 日八十月二年戌壬器
1982
中學會考試題預習專欄
化
學
(廿二)
明德出版社朱宏林 提供資料
Chemistry (22)
Reginald W. Chụ
Mill & Dale Press Ltd.
Solution to
(1)
(ii)
Gas. Xi's nitroge
(1)brown Kis
copper and
magnesium: nitride
(2)2mHg+5CuO
*Ny+3Cu+3Wj0
Ny+3Mg→M&zNz
The:concentrated
sulphuric acid
is
to dry the gas X
and to absorb any. unreacted ammonia"
(ix) (1)W is magnesium
oxide:
Z is annonís.
gas
{2}NgzN2+6W¿0
-3Mg(OH),+2NH, According to the following equation 3Mg+Ng MEN (3x24)g of Mg forms 100g of MggN2
mass of
formed by 1.54g of Mg
1.54 #今x24×100g-
-2.14%
According to the equation below. Mg3NY+6H2O
100g
3Mg(OH)2 (3x58)g
+2NH3
2x22.4dm
WAH KIU YAT PO
formed by
2g of Mezo
*100*(3x58)g
(2) 100g Mg-N
2x22 hdm3
NH at
vol of NHy obtained from 2g of
at
100
x(2x22.4)dm3
=0.896dm)
(vii) Air consists of
(b)
nitrogen. When magnesium burns air, it also combines with the nitrogen in air to form magnesium nitride which, reacting with water gives off ammonia ges that is
on
alkaline in nature.
(1)Copper(II) oxide will
remain unchanged when. heated in. a current of air. When carbon powder is heated in gir, it will combine with the oxygen in air to give carbon.. dioxide. This gas can be identified by. paesing it into some: limewater which will turn milky. C+02
CO2+Ca(UII),→→CaCO3(s)
(2)Carbon does not have
any apparent reaction with hot dilute hydrochloric acid. When copper(II) oxide is heated with dilute hydrochloric acid, pale-blue solution of copper(11) chloride: will be obtained. CuO+2HC1 Cuc1.
Solution to 0.32.
100g of MN2 (
gives (3x58)g.
of
Mg(OH)2+
-mass of
Mg(OH)2
(1)x (2) 2. (3.) T
(4) 2.
(ii) The formula is
a
XY
報日僑單
(iii) (1) Ionic
(electrovalent) hond is present in P. and the covalent bond in Q
(2) The electronic
̇structure of
282
W
The electronic structure of q
(3) Q has a lower
melling paint. P consists of:: ions held strongly together:by electrostatic force while Q consists of: molecules held together by weak.van der: waals force only. So to melt P requires: more venergy: than to melt Q (4) P will conduct
electricity because it consists of ions which are mobile in liquid state
consists of convaleut
molecules which do not conduct electricity.
even in liquid state.
(iv) The atoms in X are
held together by fairly strong. metallic bond while
Y consists of molecules held together by weak van der waale force. So, more energy is required
to melt X which
thus has a higher
melting point.
六期星
same group of the Periodic Table have the same number of electrons in the outermost (or valeice) shell of. their atoms. As the chemical properties of an element are mainly determined by the electrons in the outermost: shell; so, the
elements in the Same grouy often have similar
chemical behaviour. when hydrogen. chloride dissolves in water, it, being a polar moleculer ionizes to give chloride ions and hydronium ions. The chloride ions. thus formed will react with silver ions to give a
white precipitate
of silver chloride
Ag*(aq)+61 ̄ ̄ (aq)
AgCl(s)
Tetrachloromethane, being: non-polar, does not mix with water at all.
(iii) Pure water has a
pH of 7. When hydrogen chloride dissolves in water it ionizes to give hydronium ion which is responsible for the acidity. As a "consequence, the
pit decreases from 7 to a smaller value indicating an inerease in acidity
HCl(g)+H20→1 Ethane is... saturated
日三十月三年二八九一公年一十七國民華中育教僑華
hydrocarbon, i.e. in ethane all the C-CandC-H bonds' are single covalent bonds. However, ethene, there is a
carhen-carbon.
double, C=C, Soy ethane and ethene
dioxide.
· (2) Cu+2H2SO,
CuSD,
+2H2O+SU2
(5)The pH of the
solution would
he smaller than 7 because
Sug
is acidic in
(iii) (1)It turns from
My vorange to green. (2)Yellow particles
of sulphur are seen.
^210+3S(a)
(3) Khite
precipitate of harium sulphite appeurs.
BaCl, +H 0 S
► BaSU2(s)+2][C1
(4)It is
decolourized.
Br2+2I10+502
► 2HBr+12SO4
(iv) When S0, dissolves
8
(ii)
shows different chemical behaviour.
Solution to §.22.
The white solid is anhydrous
(111)
copper(II) sulphate,
Elementa in the
(ii) (1)Gas X is sulphur
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in water, it ionizes to give
When
ut and sulphite ions, S05 NauSUf dissolves in water,it diasociates to forci Na and 30.
803 Since both solutions contain
24
503.
ions, 80, they
show similar reactions towards certain reagents
blue because it. contains hydrated copper(11) jons,
Formula mass of NaOH!=40. Molarity of solution A. 2.0 1000 40 250
mol dri
Molecular mass of
HS-98
Molarity of
solution, B
2.45-1000-
98 250 =0.1M
(1)The pll of the
solution would
increase to 7.
(2)No, of monor
WySoy present
25 1000*9.1
= 0.0025-
No. of mol of
NaOFT added
25 1000 =0.005
mole ratio. of NaOH:H2SO4 =0.005;0.0025
That is, 2 mol of NaUH has reacted with mol of
The salt X obtained should be the normal: 结婚美 sodium
aulphate,
According to the equation
NaOH+H1SO,
·Nan SOL
of hol of Na, S0, formed:
of mol of reacted
0025.
Vol. of solution -vol, of NaOn-
vol of
1504
=25cm ?+25cm?
50 cm.
molarity.
Na SO
1,0025
50
0.05 M
1000
of mul of NGO] 20
1000×0.1 05002
, of mol of H12SO1⁄2
1000.
* 0,2
mole ratio of
10.002
1:1
0.002
Hence, the salt
obtained: would be
sodium hydrogen
sulphate, NanSo.
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