1990-12-21 — Page 24

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

息訊燁兩育教日五初月一十年午庚歷

分報日僑華

1991 中學會考預習專欄

明德出版社

MILL & DALE PRESS

金海合

聘請

5572286

夜中敎師 變 聘書記 證登

分類廣告!

大宗四個,小字卝四個

每天二十元

Chemistry (12)

W. LAM

籃價日聘

個位收實三十元。 . 般,拉计務有意森

14285908號

物理金的師中學畢業一年中小學全廂補習置 誠聘幼師 斯 屯盃補習 锑

本分靨,學校工友 藝

楊惠狂,每段{大字四福 小宇卅四個 } 定伢位,

请以下品行端正體自

遺失、鉅演告-每天每一 告、清清份床,案·

.過一個位,耶多出字歡技」 .下午五時半截稿一法律性质 不繫扣,上期青,每日

華藍海 47600932

色受想優先照数万建議 我製铿喷教師及工 一葵涌津中婚

一元朗幼稚園

王者許黃外勤惰媒

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

「商科課程者優先 任常 7600463 張太

電7601603張太洽:

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:

辛薪2000元菜珍紀念學校或電巴(三 天工作二照寄青衣島青要然古城落的西士 .8194448 4951679 18

潘先生合約見 ::心的

Ï敎師大埔補習社津中教師

望特殊津校獎條打字文員及全大埔區基督浟津貼小學 「登位應徵願兼端導師多名五急聘中文科(GM或CM 九龍深水埗或以上有責任感現心,和加者名均須二月( 完明愛樂仁鄭或大專生優先薪職有更者齮附臏歷近無

物品

高近火車站有意倦地址電話寄大埔大元邨

沃恩中學段遊收 6971616 許铅

ishapa

Tharun!

Stablo belov

Stable above 967

stablilty.

(21 In

N.P.

長及替假家

假家長免費補習介紹書記·敎師 工科合格或间非牟利教育中心免費粉做写津小新秘擴班典 日 宿令格上門補習導镝全文及各科實職教藥。

薪240

另書記一名會考合格堡 全10465 有新港各區均可歡迎報名牌記及打学往前界淡先

電:657220 查詢 4740718 社團教一件或二月份到 二撥林校長:有金國

Properation By evaporation

of sulphur solution in

By stow anel

notten sulphu

39

徵

女婚

养成 友

憶!近照寄北角建滿街 033號1樓

電商 誠歷 誠徵最易傳代国 宜

徵

箱包

1652

_6上有基礎常失望

鍾誠婚姻善心堂(非牟利)

婚姻顧問輔導中心 成 權公司有20歲至60银刀 心理輔導、解決疑難 本下垂德 让女兒面提端正位文件公 挽救游姻,收費特平 報少業:/

Mob? Je,

dark-rad

liqutd

bálfa

385 说不农大演72就地結?點送星期五休息

幸福婚姻服務有限公笥

1973HINPHENA HIL ŠEL511-8BAZE 3609986 fejdå 1665957

|美籍港女

程度香港長大家 生 【誠路65歲以下機酒標

移號 香港海时 「您阰行蜜川全兜親臨 謝协播二餘次上你在現行

尖沙回河內道二號芤撰

李開婚辦公日 3689185

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

上蘸務

竹衪大武純應物理男 金阡作化交通使尖沙咀 8912373315687

英數理化 名揚護老]]]

商業

港大英文 檔 東方縮放

8863068

疝氣帶

籌建證券交易所.對外資銀行開放

吃結爨場白

藥局外說

南岸訊息。

NO80028 MA 綺特此聲明所

「哦:香港小心誰冢登記有限公撙

|失作廢

蕸權證號碼.

遺失聲明

本人於11-12-30晚遭丢,

$7.783.20

的資金,在短期融實市場 貸規模內,提供真可能多

及楼被市場我着所產生的 半,由於資金魘乏瑴 誠然,九十年代的第

北再貼現無計近四十億元,泰券市場一月至十月的交易量

進外資銀行的设想。由中國人民银行行长丰實详若得的 ; 幾年前 - 上海在制定好漢發展戰略時,已提到有無 先接在車設分行,交通银行的消分行也將在年內開

此獲准技师学诂》段分行。隨著改革、開放的濃诛

將開始意,投資於上海的

年萬隆間

公斤損食計算,每千東多,做這方面工作的人 於一個成年人。最養成高,很難全面落實。. 一年與吃的種我平捐苗 - 由於疫苗代無價 知覺,統計,一隻成果不好。如對狗注射疫 千四百六十八嘩。極台亞政府部門,獲採取指放

這幾年 - 不少地方”

「陽大西遇的景物之組描,林奎水源,便得一山- 山有小口,從口 點捻军米爭論的焦點,如再看原著「終速桃花林] 一段 - 就像是香 一後,最近一確認四川省卣限焦爲晋代詩人陶泥明所 「挑花漂」太守信的武險郡、酉陽縣和挑游任均在這個轄區。此 .從原著「武硬志情魚片業」、「太守即请人關其住」,可知

四川省有關專家對該省西陽縣和湖南的馬源縣進行實地考察

在四川酉陽大西口 陶潛筆下「桃花源」

有關專家通過實地考察確認

皆與原著記載枏物合。 西斯裁大西海門,有一小洞原地高校史。相傳長「錢書洞,這些 載,廎原著中有「自己先世家時蘇,南唐子良人來此絕境。」在 有儒生散人,爲焚玩之福....轉入酉,駐扎一 的 此,更不符合原賽「忘路之逄近」的情况 ·《酉陽用中F

粉更符忭原著「此程度」的大環境。

桃源,是將部鄰地,人煙稠密,生產、交通寶達之地。四川西湖 「與外人間隔」,是荒山野樹,交通特案,人跡罕至之處,而游闻

• 捒史科殿,秦在公元前二百年間,晉在公元二百年至四百年間

霞您协與檢譞動打字能水 NITSUKEO

901#5229759

嵇胶橡銀碼

KOLDINGS LIMITED

strant (1991).

K00115580-

0115581-2 (@$8,000.00

IOLDINGS LIMITED

arrant (1993)

Y00121133-5

@$11,000.00

S/LIBIDOCK

RECEIPT3⁄4 SA.

Voyager 12AU

4129014 5/0 533807

*SHIPPER «{$T

夜冷巨型寫字樓

净級沝协调者椅茶冊抽牆:抽掣財經

小都擺花之號裆连憷15个攥朵(汕行数:

行成德 收購各區樓舖 成交快交吉或不交上產地

浩機地產接洽

5443955

電話:5453381

傳料侬 0505810

海海住

铲 你不意神跟!

T#

瘀

櫥

港香