翼四第張六第日八十月三年卯乙暦夏
有教僑華
中學會考專櫃
化學科(廿六
陳淇杰
堅道書院士
CHEMISTRY (#26).
Solutior for Chemistry (#25)
Mutiple Chobin Section
5. The foremkien of water pas
6 Concentrated' aqueous anmoría
bot to hydroxide, solution.
4. A Frolane"
5. AE The electie at which the
好篇
one give up electone (End
the miợng The goattiye ele.
WAH KIU YAT PO
Conventional, Questions 1.(a) When hirochloric acid and gine motnjam in contact, a die- placszent reaction takes place with evolution of hydrogen.e
THLE 『ucathyitrogen rims. a tron吧
Cucing property. The aqueous solute ion of
of ferric chloride iu yellow i olour, due to the aquated Infic. Jor. However, macant hydrogen is capable of saucing the ferrio iar to the farrous state Fe+++
Fe++
involving a change in oxidation stat
aquated form a pale green in colou Prun the óbáarved changed sin oglour when hydrochloric acid and anall pieces of zinogre added to a solut- ion of fend: chloride ž日 Prom yellow to pale green provided that the ferric ions ara completely re- duced to the ferrous stata. The reactions involved can be expreaded ast-
Zn + 2107 ZnCL + 2H
+ 2H′ →→→ 29eC1, + 2HC1 (1) Stalastites are onward growthi
of cardiva oy rbonated found in matur in Line & tone caveė.
Their
forations are explained so fellows, Burangrining the reip-water dis-
國籍 亳料 箨迷人 中時全部國際熊跟不
題,介紹國畫六法。再
全同季節凝神注
一國事- 先出示其近作
熱烈,由朱國樂
目持的大好板合云 第 有趣,認爲是耳個不如一
【示範 嗽,得
118-112 KEN |
溝悅揮 本檔
郭日僑華
BOITES" Soma caroon dioxide, tiup becoming lightly acidic. When ther rain-water flows over a 1estone ai in reaction to for EL solution or calcium bicarbonate, This solution diffusée downwards through the soil.
at thã top of a cave, it drips fra the roof. Durly the process, the water evapors.tes partially,. lasing eo rbon dioxide at the same time. Calcun carbonate is thus precipit aten, and after the proes contin we for busâ redu of yeni can 'gmy' to pézerabile an ovac-hang ioiole,
Ca (HCO,);
(0) furug the comuation of cm- pouls containing carbon, the fi st step often involves the formation or DE 2001 movide. This because there is not enough oxygen that can arpmach, the reaction site. How- ever, once carbon monoxide is formed
cient oxygen te ayasable i te burroundings, it will burr with a characteristic blue flame,"
Horine in UGt tep og alvey's blu indicating the
fiml ater of splats oxlastion
200+05
五期星
(4) When uzorine digwolves in watur, mixture of hypochlorous and hydro- chloric acids are formed te
120+C1 ROQ3 + 6 + Cl Hypochlorous acid is golden yell in colour, whilst hydrochloric and is colourlese. This chlorine water &ppaa ra to be yellow in colour. exposure to bright sunlight, hypoch Tomus void is decomposed to hylio- chlomo neda and oxygeni.....
2001 2001 + ØST
Dr
The adsolved (bat, unreacted}" cluor
ine in water will now alse be sotiv- ased to undergo the reaction:-
2012 230 401 + 2 +
The disappearance of the colour in sunlight is thus directly related to the disappearance of the hypochlor nus acil.
(e) The building material mortar is
dees followa. Slaked 1ibe.19 stirred jeste with water and
The morta
thomughly mixed in. first done with the evaporation/ad
arde into the onblution of I with carbon dioxide to fo
THE CHAPÄ calcium carbonato.
adening Domaus would tenedence
日九月五年五七九一履公年四十六國民華中 育教化文
Thema sorvas to the matric
udent porosity so the Lost' morto e qai thot water vapour cea 2150urga:
dicover towels.
variable position contraine about 200 by cogan, 300 untiane dord 10% B033 sonkide, sapas euch us ethylenn, al are preant in cul gurities. Hydrogen
various contribute to the amali or
or
con gan
# converted to carbon in che not
2. A is a nichem át néctatum
219 zaeneaza był wzíte
C in Tad arhida.
The A, bag baba maata with Si
Leira.
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the two faces of fear
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(that the go Plitextes is hydro-
But din Yutama ia dir to stead.
+
#45fccng the talatim ázitura,
The filtrate of regresium
è phobe in sielution gave ago 14-
Bronditate of namsafe hybmited D
ecca of sodium tal oxide, Tabak gastos n 182, Cná rucolar
The cdline 吃豆
VJflution hydrogen, silphide gau à,
1550 M50 1,54 Bydingen phide husnu te give stoom and wiphy.
2500 ↑ + 5 J
Thie ga 43 93 asuim, with
2nd
cetate solution to give a pinel precipitals of Tond sulphiän G.
PUPUS ↓ + 24′′
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