百二第張四第
日五十月三年巳乙曆夏
1965 19女中華會試試題預習專欄
WAH KIU YAT PO
圖為佛爾曼博士與創栔材校長等合陕
購
之
逆博士,昨(十五)日下午到發點中文大 威獠社)美國加州大學副校長節爾 魏爾曼訪聯合書院
美加州大學副校長
五期报
至博;布四彌正文
萨理次症第道十塀特
海經受監家假定
依通榮會事開九今湖天
「題預習專欄
日六十月四年五六九一麽公国五國民中
學會中文戲劇組演出 假
華僑教育
一家之主
·香港教師會主辦 中英
*大會堂舉行
可銘云。〔琳) 一時路八時,在大會堂音樂前處 一演出。由即日起至四月廿一日,2日下午 會之 湖紙本,若潔,當智精彩 優異演技備寳各界好評,該會教師 五元。密中英學會財訊財政公開 出,其 會堂音樂飆由滑黹中英學會中文齣劇組上 十、二十一日彤務下午8時起,准霅帶大 「一家之主」,逛翎11
〔特氜)香港泳師會定四月十九、二
* 香港學生書畫展覽 明日開始一連三天
文大學新東院舉辦代表作品,運各界 假新亞書院禮堂舉行
假
湖醴鐵六在人
下午1時行和英典| 潮汕文教會送
禮,由該校代校長吳
他升博士主持,几
林子體赴美
進可
入盘 送 慈合該备生
化學科 (十九)
·王錦釗。
(1適合下列條件的物值各舉一例.
化學科
(十九) 猛調成
第十八次答了
物質
舉例
九六五
a. 热缩冷脹
b為氧化劑,有時亦是還原劑
心不潮濕之乾燥劑
d.有過飽和現象
& 不能溶於鹽酸,但可溶於硝酸
物質:
化热缩冷胀
舉例
Bi
b. 為氧化劑,有時亦是還原劑 H202
C. 不潮濕之乾燥劑
d. 有過飽和現象.
Cae
Nar Se Os
. 不能溶於鹽酸,但可溶於硝酸 G...
2. 寫出下列各物償之民好溶劑三
物蕉
油漆
6.香料
老樹
.
d.
料
e. 樹脂
溶劑
溶劑
By Cz Hs QH
CHEMISTRY
Ir Answers to last week's questions —j
question i
(s) Nitrous oxide may be prepared in the laboratóry by the action of heat on a mixture of sodium nitrate and an ammonium salt Buch as ammonium sulphate.
ZIANO,
sodium
↑ (NH4)2SO4
ammonium emulphate
醚C2H5O.GH5
商用 CH.CO-CH3
'Mchant of
基
Na Nog auch
thR), 50
CE HE
3. 下列各元素在空氣中加热所生案化,那個
2NH, NO
Na2SO
!
:mmonium nitrate
aodium
uluate]
aitrous oxida
$2
是物理变化,那個是化学变化,
化
d
物理变化
填-
a.用20升工氧可製二氧化硫
升
口濃硫酸加入糖是
C工業上製氫氧化鈉,
作用 法
民紙中含有,
元素,因為燃燒時產生
氣体
1
and its contents are then cooled and weighed. The ferrous aul-] phide is then mixed with more powdered sulphor and the whole is heated again until no further chemical change takes place. ፕ¢ crucible and its contents are again cooled and weighed. Thia process is repeated until a constant weight is obtained, thus ensuring that all the iron has been converted to ferrous sulphide
Fe
-
Fes
The gas is now put into a flask fitted with a delivery tube and a thistle funuel. When hydrochloric acid is poured down the thistle funuel, effervescence will occur when it comes into contact with the solid, and a colourless gas, with aswell ofbad eggs. will be evolved.
Fes + 211C] -
FeCig
H2S↑
The gas is then bubbled through a vrechsel vottle contain ing water to remove the hydrogen chloride which will be present as an impurity, and is finally collected over warm water,
sulphids and
Ang makuhac
"To trough of sear
-Wath to absorb HŰLJ.
The gan
collected over ware vater, booAU
soluble in cold water,
(a) Darrerences between nitrous oxide and oxygen:-
(1) Nitrous oxide will not give brown fumen with nitrie,
oxide; oxygen will,
(2) Nitrous, oxide will extinguish a focusy, Lauwang #pṣant}]
ozygen vill rekindle, « feebly glowing #plint
(3) Nitrous oxide is fairly soluble in cold water; oxygen;
La practically insoluble
(a) When the gas is bubbled into a solution of lead nitrate,]
a black precipitate of lead sulphide will be obtained.
Pb(Ng}q • •‹ X2S.-,'PbS] ' 2HNO
(b)when HS is bubbled into neutral litmus solution, its solution in water is just sufficiently acidic to turn the litmus solution, alightly red.
c) When II, ia bubbled into ammonia solution, ammonium bydro- sutpliide lõ formed. If an equal volume of the same ammonia
lution is added to this solution, a solution of ammonium aut pliide will be obtained,
Ca
No 14x2+16]
Cuu
64 16
́64*
NIL
(NH)us (NH4)2S
答:2围20升三氧可製三氧化硫 20升
6.濃硫酸加入糖是脱水作用.
C 工業上製氫氧化鈉有石灰法及電解法.
d. 纸中含有碳元素,因肉燃燒時產生二氧化
流体
写試以方程式表明下列反想
Q. ALSO. AF NaOH GUB
b、加硫代硫酸鈉澹疸於氯化銀
C.硫酸鋁灌於水
答Q通SO2NaOH溶湘
SO2 + 2 NaOH Naz S45+ H20
加硫代硫酸鈉溶液於氯化銀
·Ag Cl + Naz Sa Os Na Ag Sa 03 + Nace
C.硫酸鋁溶於水。
Al2(SO4)3+6H20-->3H2SO4+2Al(OH)S
試寫出下列各物腹之分子式及普通名稱
勿
分子式!
The gram-molecular str
Volume of 44 gm8, 02-N,
Volume 01 N20 at Niť, Popaed
at can be seen that the commeria AREXCE
kt. of copper that reacts with the ganas
(224
164 gma
wt of uncombined copper).
28.57 Buổi (5028.57) gus.'
21.43 gras
10
80 gms
Mt. of CuO formed.
35.71 gms.
of solid residue obtained
PUBLIH
丸、硫酸鎂結晶
b、鹽基式碳酸銅
d碳化矽
物
氟化鈣
分子式
光酸鎂 MgSO-7H2O.
b盐基式碳酸銅CCOCO3.Ge(OH)
C.硫化砷
Ast $3
d碳化矽
SC
2. 氧化鈣
"Ca F2
(21.3335.
gma
57.148
普通名稱
Juestion 2
Mix intimately 20 gma, of iron filings with 15 gas, of powered sulpher, the substances being weighed approximately.com. a quick-weighing balance, The mixture is transferred to a large, crucible and the whole is heated until all the sulphur ha a
burned away and no further change takes place. The crucibl
普通名稠
鴻
雌黄
即
7. 寫出一含氮的化合物(以分子式表示),單獨加热
能生下列氣体:(不必寫方程式)
被热物透
被拒物
Pb(NO)
NH4 NO2
NHO NO
~Pb (NO3)2
Nho Cl
(02.
Ni
INTO
NO
NHa
產品
0
No
Nio
Now
NH2
厨房有王杯溶液ABC己知是糖水,伍水,腊
孤,但混亂了,今用導電儀器分别此三種物资
A.不能使燈泡發亮故知是一
B.使燈泡發脂紅色故知是
*使燈泡大亮故知是
答 A,不能使燈泡發亮故知是糖水
3,使燈泡發暗紅色救知是醋酸
c‧使燈泡太亮故知是盐水
9. 選擇正確答案
久那佣硫化物是白色?且不溶於水,而溶於椒
vcas
(iv) ZHS
(ii) PbS
ii) Sb. So
(V) Naz S
下列各物那個是两性氧氧化合物!!
KOH Lii) NaOH (i) Ca(OH)2.
(iv) Me(OH)2 (v)Al(OH)3
C. 下列各物那個失资盛作用生氨氣?
Ca(OH) U M2 (OH), (ii) A&COH), (V)AZN (OH):
6.氫離子與氫氧離子間的反應稱為
(1)中和
e. 下列各物度那一個是非电解性
(C) KOH UDNH4OHUM GUSOH
HCl
零;G那個硫化物是白色?且不溶於水,而洛於科
tined siin-P6S
UZXS-
NS
-- (ZxS) b. 下列各物那個是两性氢氧化合物?
(i) KOH (ii) NaOH (iii) Ca(OH)2
(iv) Mg(OH) (V) ALCOH),-----(AL(OH)3)
C. 下列各物那個以銨鹽作用生乳乳?
(1)Ca(OH)2 ui)Mg(OH), (ii) Al(OH),
(i) Zn(OH)2 -- ( Ca(OH)2)
1. 氪離子與氧氧離子間的反應精為, (山水解(jiù電解(iii)中和 ()分解-----(中和)
L下列各物愎那一個是非電解性: (JKOH NHLOH jl). C2H5OH LiVi HCl
V)KCE----(CrHeOH)
(d) When IIS is bubbled through a solution of ferric chloride, it will reduce the ferric chloride solution, which 1p yellow brown in colour, to ferrous chloride solution, which is pale green in colour Ilowever, the resulting solution will be practically colourless clady solution, owing to the suspension
sulphur which is obtained.
2F.C1
2FeC11201 SV
-questions for next week-
1,50 gm, of a mixture of copper sulphate pentahydrate, and Band after gentle and prolonged heating was found to leave, a residue veighing 1,05 gm: Calculate the percentage composition of the mixture :-
of the mist
(b):A weighed crystal of pure calcium carbonate. wus dropeed
into 25 ml of bench dilute nitric acid. When the reaction was complete, the crystal vas withdrawn, washed, dried, and weighed. If the loss in weight of the crystal was 2:50 gm., find the number ofgrams of nitric acid in 1 litre- of the: bench acid.
(à) Give a brief description, with equations for the chemical
reactions, of the blast furnace process for the production of iron. (A diagram 1s not necessary), (b) What happens. Varmed 5th atlas srystals are (1) heated alone;
():
Dissolved in, water, treated with a solution or andium bydroxide, and the product allowed to stand in air.
完成及平衡下列各才程式
Q. Ner CO2 + Ca(HCO3)2-
b. Nax Si Os + Ix-
c:Cu(OH)2+NHeOH
d. Na Ox t H x 0
c= Zx + HNO2-
To a Narcos + Ca (HCO3 ) ; →→→→→ 2 Na H C O 3 + C2 C Ost.
b2 Na i Sa Os + Iz
C-Cu (OH)2+AN H4OH -
d. 2 Nax Oz t 2 H x D-
Nan S406 + 2 Na I
• Cu (NH3) 4 (OH)2+4H10 4No0H+O2↑
132元+8HN03- →32nCNls)2+4H2O+2NO1.
乙:
第十九次預習問題
試述一氧化 乳在實驗室;浆法(附圖)及其主 要性漠
2. 試繪圖說明本生燈,構造如何?本生燈焰可 分為若干層?並分别舉出各湾之化學夷化温度 及光度有何不同?
試以實驗証明(丸)水是催化劑(b)普通水溶有登 氣及雜值
14. A,試以最簡化学方法鑑别下列各種物隕
a KCC AVKI
上硫果铁粉
B試以最简单方法将下列各氯体由混合氣
体内析出
2.一氧化氮以氧化亚氣。
15. 氧化銅水溶湘中通以15安培之电流1小
時,其分解之电解质為量幾
16. 080克氧化銅還原後得
氧化亚铜是原核化
是否具倍比定独有
铜1.43克
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