3. Chemical Properties of Sulphur.
Sulphuris chemically qufte reactive.
sulphur (IV) sulphuriVI
31 Sulphur burns in air with a blue
flame,
giving oxide (502). oxide ($0).
250,
3.2. Sulphur. can combines directly with Bost metals and many non-metals to fore the sulphides.. Heating is. required.
Fes
iren(11) sulphide
(2) 200 +5
報日僑華
5.4 The sulphite ion - (502) |
reducing properties because it is an electron donor. On reducing other substances, it is itself oxidized to the sulphate ion (50, 2).
・(aq) + (0))
D.M. increases
'(+6) ·
五期星 日一廿月二十〇九九一)年九十七國民葦中(24)
7. Sulphites and hydrogen sulphites.
7.1 Soluble sulphites and hydrogen
sulphites dissociate to
503
*(aq) when dissolved in water. so, they give similar reactions as aqueous 30 solution.
7.2 Dilute strong. acids: fberate siy
from matal sulphites and hydrogen- sulphates. Heating is sometimes required.
50.2 (s) + 2(aq)
Examples
Reigent
Observations and Equations Sulphate ions" formed |250 ̧ ̧ ̈¥aq)+0,(g)
HS©," {s}+H*(aq}
7.3 Boiling
(2)
Conc, HNO Redd
250 (q)
brown gas. (NO)); heat
- H2Ole)+50g (g):
@roxide:
Paritiae.
Purifier
Converter packed with
a batolyat at: 450°C)
water
Concentrated.
sulphur ta hotd
Absorption Tower
一廿月二十(〇九九一)年九十七國民華中
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分報日僑華
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unit 7: Reviston notes on Sulphur. and
its compounds:
津中文員 女校務員
(飞中聘女文員預科九龍津中聘女然 中或大專程度商科舉員會考合格打字
業打字快懂會計熟快字體秀麗修畢, 『習津中情况可即上一
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理工大
Crystalline
自50涨价
sulphur
Rhombic Monoclinic:
sulptur་. sulphurs
(a-sulphur) (2-sulphur)
Snt phur:
1.1 Allotropes of an element are the different. crystal forms of the
elements, ive, the different ways.
fts constituent particles being. arranged..
1.2 Solid sulphur, exists in several
allotropic forms.
Solid Sulphur:
Amorphous. sulphur e.g.plastic
sulphur
powdered
sulphur
1.3 Differences between rhombic and
monoclinic sulphur
Fahomble sufphian Monmainio sulphur |
Pale=yellow
Copper(1) sulphide. N.B. Usually the sulphides with the metals in the lowest oxidation:
are obtained, e.g. [Cu1},52-
e.g., (3), 4, (7) + $(#).
3.3 Sulphur is oxidized by strong
oxidising agents such
H2SO and conc. HNO
0.N. increases
(+4)
4
cone.
:(31
Halagens solution
HD: greenish-yellow to
colour less
+4_0 → 50 +244 +208
brange-yellow to colourless
Tight Brown colour lass
`14): old?ifed. Purple to colourless
2-
+2H+201
H2O(l)+SOy(g)
sodium sulphite forms sodium thiosulphate ("hypo"}。
with
Sulphur.
Ny SD + 3 N&503
7.4 White "precipitate is obtained on adding: barium chloride on barium nitrate solution to some aquecus.
معالی
SO. The precipitate is dissolved en adding dilute HCl or us to it.
B&SOgts)+2H+(aq)
7.5 Test for sulphite/hydrogen sulphite
If 502 is detelted on adding a
dilute strong acid.(eg. HCT, HNG)
a solid, then the solid is a metal sulphite or hydrogen sulphite.
(a) Suggest a method by which sulphur
dioxide is readily obtained.
(b) What is X? Write an equation of
its formation."
(c) What is Y?
its formation,
Write an equation of
(d) Name a suitable catalyst to be put
in the converter. -.
(e) Why are sulphur dioxide and oxygen to be purified before they are passed into the converter?
(F) Why is concentrated sulphuric acid,
but not water added to the absorption tower?
Solution to 0.7.1
(a) X is sulphur dioxide.
-
Na2 50g + 2HC1 NaCl +
(b) The bromine water turds from yellow
to colourless.
*$0g + 2H2O + 80g)
H2SOA
+2H8r
(c) The set-up is shown as below.
ditute hydrochloro
(5) Aclared Drange, to green
207
聘
並推福音廣播中心心聘執 上午校慈聘中數美勞行幹事推廣影音宣妝工作 中五程度教聯有澤咨論消履歷近心志對正滑事「有負操之
青衣津小聘執行幹事
Colour
Bright Fellow!
to
| Structure
S-molecules
5-molecules (Sq)
solation
2-
(5q! Alsoly
Tass closely
picked
packed
O.N. increases
Donsity:
Highes
towar (1.98 pea
(+6)
Crystal
12.06 gen
Hond joxide
(Black-sold to white sollë
PESO
oct shecrai
4.' Uses of aud
acto
calcium sjaydrogerisumanite Cš (HSOg), for bleaching wood pulp in paper
Industry
rubber vulcanization of (making it hard and tough).
(4) In making matches, fireworks,
gunpowder, etc..
(5) As a fungicide, insecticide and
soil conditioners.-
96°0
sulphur
Thus,
·96°C 157 transition temperatur
2.
Effect of heat on sulphur
(7) In
2.1 Observation
(6) In sulphur ointments, tablets
and drugs:
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Properation By evaporation
of sulphur solution in
By stow anel
notten sulphu
39
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蛋正除T
Sudden
at 445-6
3880108
3880193 純電啡米30
Brown
藍線378017
清打
2:2 Explanation:
closely packed
long chains broken
up to mati chōins:
molecules Separated
making thiosulphate,
5. Chemical Properties of 502
| 5.1 Dry Soy is rather inert.
30 becomes very reactive in the presence of water.
5.2 When dissolved in water, 502. reacts With water to form the sulphurous acid (8,50) which then ionizes to: = give hydronium tons: (HGo↑), the hydrogensulphite ions (HS0,) and
sqlphite. fons (50g2").
bole
H250 (aq) (ag)
Thus, aqueous solutio
190°C
All these chang are
1910
consis
44410
of H2o*, HSO2 and So
2-
Tans.
alecules
broken up to
ohalos
bot is at
strangled and
Joined: up
Together:
445°C
潔臘
罐 水晶地板 陽行、
th; 8061111
3384 g
` 帶
遺失聲明
aw, Cheung iling FĦRA 7 WL01440501 3 BE 69100) ***
无求相传等能自動蹤無效。
北沙醫
遺失九巴
職員証:
amall chains broken up.
to give a wafecules
one sulphurous acid is a weak dibasic
acid. It forms tød series of salts
by neutralization: sulphites 50 formed :
2-
salt) and hydrogen-
45 Mueous. So can bleach.stnaw paper,
and silk
jon
Question 7.1
A gas is evolved on warming sodtun. sulphite crystals with an excess of idi tute hydrochloric acid. The gas X 章鱼 then bubblad into 2 cm3 of bromine.
(a) Name the gas X.
Thus, its bleachi temporary because fo
be recovered da
#only
Man on by
(b)
colourless
5.6 50 can also act as an oxidising agent when it reacts with a stráng reducing agent, e.g. burning. big. hydrogen sulphide HS, atc.
e.g. (1) Burning Mg continues to burn in 50, to give white clouds of magnessium oxide and yellow deposits of sulphur.
}
+ 249. -2Mg0 S
D.N. decreases
(2) Yellow deposits of sulphur are seen when $0, reacts with Has in the presence: of a trace amount of water.
axidation
reduction
160, (and sulphites); RaAs haacking agent.. 2 AS preservatives.. (3) As disinfectant. (4) In manufacture.
"acid.
(a) Ciy + 2H250g
test tube
sodium
Bronine
Write an equation of its formation. (e) The oxidizing. power of conc, H2SO. (f) No. It is because dil H2S is not
an oxidising agent.
ald happen to the bromine
Gas X can al copper turnings, sulphuric acid.
equation of the changes
diagram of the apparatus yuu: use to carry out the above experiment.
by heating concentrated
feaction. concentrated. sulphuric acid is indicated by the
reaction?
(d) Write an das tren (e) What・・ property
of
(f) would gas, X be obtained by using dilute sulphuric acid and copper? Explain briefly
A student passed an exopf, gas. X into 5cms of 1M 388ium hydroxide solution. He then eva rated the ness and resulting solution Re obtained some white powder as the residue..
(g) Name the whitehowded obtained on Bevaporation were an equation.of
its formation.
When burning magnesium ribbon was put into sopagas the magnesium continue tos buen with á spluttering flame.
ite: wage a whita and a yellow However, if a burning candle was put into the gas X, the candle Flame was at once extinguished. Mhy What would he obtained from the
burning magnesium in gas X7
Write an equation of the reaction... (1) Explain the observation in the
above experiment.
「(j) Draw a diagram of the apparatus you. would use in carrying out the above. experiment.
-H-50g Questian 7-2
sulphites, H50g", (acid sait), eigi
Pt
catalyst:
(5) In purifying® the
fractions of petroleum.
Light
Na2SUg, kHSOg, etc.
光重陳人名界商台
資投陸大赴劃計正
The manufacture of sulphuric acid by the Contact. Process is represented by the schematic diagram below,
(g) Sodium hydrogen sulphite (NaH$0.
SOg & NaOH + NaHSO3.
(h) The yellow solid is sulphure -- The white solid. is magnesium oxide. 249 + 50
2MgD+ S.
(f) Gas 冀:(SO♭) does not support
extinguished in it. However, the energy: 1.iberated by the burning to magnes Lum is great enough decompose yas X (50) to sulphur and oxygen, so, it can continue to in the oxygen. to form magnesium oxide,
(3) The set up.js:
Solution to 0.7.2
spoon
burning magnesi
Tbban:
(a) 50g is obtained by hurning. sulphur.
in air or by roasting from pyrite (Fes2) in air.
(b) X is sulphur trioxide.
2502(g) + O2(9) == 2503(9) (c)y is oleum..
H2SO1 (0) + SQ2 (g)
((d) Platinum or, Vanadfun(V): oxide
(e) The impurities in 2 or 502 would
poison the catalyst..
(f), 50, forms misty acid fumes coming into contact with water, whereas it dissolves readily and smoothly in Conc. H2504
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