四期星日二廿月四年二八九一腊公年-十七國民華中 育教僑華
頁四第張九第
日九廿月三年戌壬歷室
WAH KIU YAT PO
報日僑華
1982
No. of mol of HoOg present in
In E white
gelatinous
Na*+41(0!),
中學會考試題預習專欄
100cm) Ho0g
solution
precipitate'
aluminium
of mol
0.01847
0.00924
hydroxide is seen,
+20F →Pb(OH)(a):
No. of mol of HCl reacted
Ca
→ Cn(GH)2(a)
No.
+20HT
Zn(071),(3)
Cu
420F
化學 C廿八)
明德出版社朱宏林 提供資料
Chemistry (28)
Reginald W. Chu
MILL & DALE PRESS LTD.
Solutina tại 4.0
(i) W is iron(II)
sulphide;
X is hydrogen sulphide;
Y is sodium
sulphite;
is suur dioxide.
(1) FeS+2HCY
„FeĈI
(2) I,S+Ph(NO3),
PHS+2NOg
(3) Na2S0 ̧+2HC1
(111)
27aC1+10+502
Iron(III) chloride
would turn: from yellowish-hrown. to pale green and yellow precipit- ates of sulphur
obtained.
are
2Fe
34
+H2S
2Fe :+5+2H (2) Tron(1JT)cludoride
Would turn from
yellowish-brown to pale-green but there is no
pricipitate.
21e
2Fe
(iv)Pale-yellow solids of
sulphur are tuhiained as a redox reactron
has taken place.
2112S+SO2
(b) Vol of
JS(s)+211,0
at s.t.p.
obtained
273 750
=450x75
413.8 cm3
110
of mol
413.8. 22400
0.01847
According to the
equation below,
克勤率:
H
補
2120+0g
教
the molarity of
solution
HoO
00924. *
1000
0.00924 moldm
(c) According to the
·given equation,
no. of mol of KMnú
present în 20 cm solution
xmoof mol of
reacted
1000
2002:
the molarity of 200, solution.
1000
002% 20
0.1 moldm
Solution to. Q./1
(i) Ammonia solution
contains ammonium ions (NH,
hydroxide ions (OH and the molecular ammonia (NIL).
Sodium hydroxide solution contains
sodium-ions (Nat)
and hydroxide ions (OH)。
(ii)Both are. considered
as alkalis because they both contain the hydroxide iona (on).
(iii)
(1) The observations
are as follows: In A, white precipitate of Lead(1)}hydroxiu
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17
is seen.
In B, white
itate of
precipi
calcium hydroxide
is seen
In C, white,
gelatinous. :precipitate of zine hydroxide
seen.
In D, light. blue
precipitate of
copper(11)
hydroxide is seen.
科八
Cu(ON)(s)
+3017
A1 (CH)3(8)
(iv)In A, there is no
change and the whi党好 precipitate of Pb(Ul), previously
formed remains. In B, there is no. change and the white. precipitate of Ca(OH), previously formed remains. In C, the precipit- ate of Zn(OI),
dissolves in excess ammonia solution due to the formation of a complexion of zinc.
Zn(OI!),,+4NIIZ.
2+
“In D, the precipit- of Cut011), dissolves in excess ammonia solution due to the formati în complex ion of copper-
Cu (NII3)
In E, there is no change and the precipitate previously formed remains. S
(v) There will be no
change in B and 9, and the precipitate previously formed
will remains..
However, precipitates previously formed in A. C and
dissolve. in excess sodium hydroxide solution to give a clear solution.
Pb(OH),,+2NaOff
2Na+4Pb(OH)
Zn(F)p+2NaOHT
2Na++Zn(0)4
A1(01!) +NaOfI
則蕭史
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台術
741231
7897589 获全
35
100028
29035
-of mol of NaOH reacted
15 1000*0.2
00005
on mixing, no. of
·mol. of NaCl formed
no. of mol of *NãÇII-added
-0.003
But, the volume of solution is 50 cm:
molarit ty. or NaCl the solution
0,003.
50 20,06TMM
x 1000
(ii)No. ̈ of mol of Cl
present in 25 cm) of
solution X
x no. of mol of
HCl originally present
*: 0.0035 0.00175
According to the équation below
AgCl(s)
No. of mol of AgNOg required
no of mol of Ag
reacted
no. of mol of CE presen 0.00175.
Let the volume of AgNO, required be
Then,
1000
=0.00175
Hence, the volume
of 0.05 M. required is 35
(iii)No. of mol of
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【味油曲
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precipitated
of mol of present în
of
AgC1
no.
CI
25cm
X
0.00175
colation:
Pormulanosm:off
ACCI
= 108 35:5
143.5
Bass of the
precipitate (AgCI)
obtained ball
143-5 x 0,00175
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(iv)This is due to the
fact that when
silver chloride:
precipitate is exposed to sunlight for some time,. it decomposes to give metallic silver. appearing grey.
Solut om
("}) x is iron(11)
eiloride
(11) CL+Ve
FeCl2 (8) +lg
(iii)The substance Yis water vapgun. My+Cu0
(iv)
Water is to remove
any unreacted
by droga fa
gas.
chloride:
(2) Concentrated
sulphuric acid. to dry the gas.
(1) There is a
reaction.and:
zine(IF) chloride ia formed.
reaction because copper is belov hydrogen in the Activity Series,
gn, it cannot displace hydrogen from:hydrogen chloride
(b)
(i)
Concentrated.
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sulphuric acid is non-volatile,
thus
displacing the more. volatile nitric acid from the metal nitrates.
- NaHSO), +IING
However, concentrated hydrochloric acid
fumes strongly and
point, so, it
cannot displace IND. IIND from nitrates..
Besides the nitric
acid will be
contaminated of
hydrogen chloride.
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chlorine
dissolves in water,
it forms
hydrochloric acid, (BC10), which is unstable ani Is readily decomposed. by sunli glit. So, cilorine water is not stored, under.. sunlight.
2nci o
aC10
Yellow phosphorus
is very reactive and bursts into flame spontaneously when in contáct with air. So, it is. stored under water..
Yarmonia gas readily
escapes from ammonid golution if the bottle is not. Lightly stoppered. En adi 1i on, ammonia has a pungent unpleasant sme is poisonous in nature.
The white film is calcium carbonate which, being ingoluble in water cannot be washed away with water. The film is formed by action f almuspheric
droxide on arhon
limevater. Ca(0!0), «C0,
(c) Formula mess
旺NT
J122
小
160
According to the equation below Fe ̧ ̧0, +3CO — “P¢ +CO2 160.g
(2x56) g
nass of Penoz -
required to
produce 560 kg.
of iron
160 x
B00 kg
560
2x56
mass of haematite
200 .x
1250 kg
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