(1) X is ammonium chloride i
Y is lead(I)nitrate;
Z is zino sulphate.
2Pb(NO)2Pb0+4N02+02
yellow brown
報日僑
flow from zinc. to copper.
(iii) The sulphete Long would pass through the porous pot from inside to outside because there la an excess of zinc ions which are positively oharged whereas the sulphate. ions are negatively charged, (iv) According to the equations
in (1).
三第張七第日九廿月三年巳丁鹰复
Solution to 0.2
WAH KIU YAT PO
1977中學會考試題預習專欄:
明德社主編
8
化學科建議答案 朱宏林·
街
residue
gas
(2) H2S+Pb(No2)→→Pbs (e)+2HNO,
black
ppt.
(3) NaOH+NH CL
(4)Znson+2
8
Chemistry:
(Suggested solutions
to H.K.C.E.E. 1977 )
Solution to 0.1
The repeating unit in the given polymer is
Η
COOH H
(ii) The structural formula of.
the monomer is
R
COOH
(111) RH
黥
Cane CH2
book
(Iv) RH
(1)
8
COOH
H
H+ H2
COOH
Сосн Conditions: a catalyst(such
as platinum or nickel); at about 140°C and under a high pressure"
2
B-C-COOH+CH 0
2
R-COOCH
+ H2O
Conditions an acid as the
catalyst and heating is required.
· R¬C¬COOH+Mg-VRH the
Conditionss the reaction takes place spontaneously in cold.
OH
HCOOH
reagent: an oxidising agent
such as acidified potassium dichromate or potassium permangante, condition: heating is required.
(11) CH,CH,OH
CH2=CHg
reagent: concentrated sulph- uric acid:
condition: at about 180°c
and an excess of
cono E2SO4
411) CH CHCH OH + PC15
CH3CE CB2C1 + P203
:OF3CH CH CH2OH+2PC13
+ HCL
3CE3CH2CH2C1 + P20g + 3HC1 reagent: phophosrus(v)chlo
ride or phosphorus
(JIT)chloride.
conditions: the reaction
takes place in cold.
(1)The rate of both the forw
ward and backward reactions will be increased.
(2) The equilibrium position
will be shifted to the left. (3) The amount of will be
decreased.
(ii)(1)The rate of both the forw
Ward and backward reactions will be increased.
(2) The equilibrium position will be shifted to the right
(3)The amount of 2 will be
increased.
新
一起民朝早天,甜報 早天 機、天氣、心、蝦 十鑀 卅三 九八 天 時興分報 踭曲,告時 長氣
*報在
農開甜街 繼
·馮一個心,
隊
*新纖簡
甜
心
NaC1+H2O+NH2 (g).
alkaline gas Zn(OH)2+Na/SO
white ppt.
Zn(OH)+2NaOH Na, Zn(OH) 4
4.
soluble in water
(5) AgNO2 + NH 01-AgCl (8)+NH NO (6)BaCl2+ZnSO
(111)
white ppt.
●BaSO4(s)+Zn¢12
white ppt.
(1). No observable change as there
' is no reactiona
(2) White precipitate of lead(II)
hydroxide is seen which then dissolves in the excess of ammonia solution.
(3) white precipitate of zinc
hydroxide is observed which does not dissolve in excess
ammonia solution,
(b) Let the relative atomic mass
of X be y, then the formula
A
mass of XCO, is,
(y + 12 +216x3)
= (60+ y)
no. of moles of 100 in 2. of it is,
(60 +y) moles.
No. of moles of HC1 originally present is,
x 1 moles =0.05 moles: 7.000 But, according to the followm ing equation
NaOH + RC1 --- NaCl + H2O No. of moles of HCL unused =(no. of moles of NaOH requn
ired for neutralization 30
xx 1 moles 1000
0.03 moles
no. of moles of HC1 used up by XCO, = (0.05 - 0.03)moles =0.02molee But, according to the aquati ion below
+2HC1→→ XC1+H20+CO2
no. of moles of XCO, present =dxno. of moles of HCl used
up by the carbonate.
x 0.02 moles
0.01 moles
2
(60+) moles
Hence, we have the following equation:-
2:
(60+7)
y = 140
=0.01
'Hence, the relative atomic.
mass of K is 140.
Solution to 0.3
(a)(1) At the copper plate:w
Cu
+20 At the zinc pode-
2+
2:+2e (ii) No, actually there is an
electron flow from ́zinc rod. to the copper plate. When zinc dissolves in zinc sulph- ate to form zinc ions, it leaves the valency electrons on the rod; so there is an accumulation of electrons. on the zinc rod. Whereas elec trons are, removed from the copper plates to discharge copper ions.
六時,新阳市南,
奉夜 知
音效
分
愛十
Hence electrons
分分
戴十介榮
記籣老天 ̇憫老灭
平民 奶
早報 友餐
十閒,朝天九,配報入
告分時
新
卅
糧聞生聞、豫分、
早分繩聞一海
服朝報 严新得辣,老新早告:
no. of moles of Cu deposited no, of moles of Zn dissolved
*** moles
65.4
, Change, in mass of the.
copper plate
= mass of copper deposited.
65x63.58
"= 0.971 8
(v) It means that when magnesium
is in contact with either zino ions or copper ions, electrons vill be transferred to zine ions or copper ions so as to displace zino ar copper out. This is becasue magnesium has a stronger ten- dency to lose electrons than either zinc metal or copper. metal,
In this case, magnesium would dissolve to form magnesium iong. and zinc Lons wóuld be discharged at the zinc rod and electrons would flow from magnesium plate to zinc rod, (b) Mage of carbon in the compowr
8.68 x 14
-na
1.8 €
12
Mass of hydrogen in it 2 = 3.68 x 18 0.4 6
J
Mass of oxygen in it = (3.0 — 1.8 - 0.4) g
= 0,8 g 心
Let' p = no. of moles of c
q = no. of moles of H
r = no. of moles of 0 Then, pq: 2
0.4
12-1
= 0.15 0.4 : 0.05
381.
The empirical formula of the compound: is: C-H80*
Hence, x=3, y=8 and 2=1,
The bromine solution is de- colourized.
(11) FB C1
平
BE/
I C1
HBr OH 2-chloro-
H-C-C-C-CH and F-C
HBr Br
2-chloro-
2,3-dibromo-
butans
3-bromo- butan-2-01:
(iii) The reaction is kiown as
the addition reaction.
Solution to 0.4
(11)
The lime water turns. milky or cloudy at first due to the formation of the insoluble. calcium carbonate; it then turns clear again as calcium carbonate reacts with excess carbon dioxide to form the soluble calcium hydrogen car- bonate .
(1) The current at P is maximum. because at this moment, the solution contains the maximum
mumber of ions, Can and OB which are responsible for the electrical conductivity in. the solution.
(2) The current decreases from P
to @because calcium iona and hydroxide ions are continuously! removed from the solution by the carbon dioxide which
!「香港流行」。
with them,
漢想曲》,五十七分,
三時卅分,情有独新聞簡報。
四時 - 唐睿交事曲 |-
十二時,天氣報告
靚盤
五分,「i」商業二台
骨陳任」。
*..
六時,黃昏的旋律
ARE THE DAY
·七味,美麗的音符,卅分,新聞簡報,天一次,「被綠」片集,五十分,
「AQUAMAZ]。
時
’九時·新聞簪報,
八時四十五分,B分,新閒簡報(一?民天氣,時代
reacts
·2+
-期星
日六十月五年七七九一層公年六十六國民繭中
Ca2++2OH*+CO2→CaCO3+H2O
One of the products is insolu- ble and the other is a non- electrolyte.
2
(3). The current: at Q is miniiman
because at this moment, almost
and the OH have. all the Ca reacted with CO,.
. So the so- lution at this moment only contains water and an insolus ble solid.
(4) The current inoreases from Q to R due to the formation of the calcium hydrogen carbonate which can dissolve in water to give balcium ions and hyd- rogen carbonate Lons which cem conduct electricity in solution,
2+
CaCOg(s)+EO+CO Ca2+(aq)
+2HCO3(aq)
(5) By this moment, all the calm
ium carbonate has been conven- ted to calcium hydrogen carbi onate and only the electrolysis. of water is taking place,
Solution to 0.5
(a) (1) The gas is chlorine.
The equation is
2KMnO +16HC1-2KC1 + 2MnCl2 + 8H20 + 5C12
OF
+1001 +16#* →2in- 820 +5012
(14)Sodium hydroxide has a higher
melting point than sulphurio acid does. In sodium hydro xide, the sodium done and the hydroxide Lons are attracted: together by strong electront- atio or ionio force so much more energy is required to separate the ions; hence ite melting point is high. But, aulphuric acid. is composed . of covalent molecules which are held together by the weak van der waale force, so they are easily separated. (v) atom of C has seven electroni
in the outermost shell..
00-00
C-atom
C-atom
molecule
of C
The molecule of Cis diatomic, The bonding present in it is
the covalent bond,i.e. sharing
of a pair of electrons.
育教
教僑華
HONG KONG CERTIFICATE OF EDUCATION EXAMINATION 1977
歷史
試卷一:
一小排三十分臨參
2+
(ii)(1)Water is used to purify Cl2
by dissolving the hydrogen chloride gas.
(2) Concentrated sulphurio acid is used to dry the chlorine gas.
(111) 2Fe + 3012 → 2FeCl3(8) (iv) The black sulbimate is an hydrous iron(IIT)chloride. (v) Soda lime is used to react
with the excess chlorine gas. and it also acts as a drying agent, preventing moisture from entering into the flask. (vi)(1) There is reaction between copper and chlorine. The. product is the anhydrous copper(II)chloride.
8
(2)
Cu + Cl2 - Cu012(e)
There is no direct resot- ion between carbon and chlorine gas,
The formula of. Y is BCy, if that of X is AC.
(ii) If the ion of C has one unit. negative. charge, then the Lon: of A has one unit positive charge and that of B has two unite of positive charge, So the elements A, B and C be long. to groups I, II and VII respectively, kt
(iii) C. would be liberated at the
anode,
(iv) A has little tendency to
form an ionic compound with "B because both A and Bare. electropositve and both of them tend to lose electrons to form dations
陳好歌。:
當台節目相同。 香港二台
(1) Sodium hydroxide and sulphurio.
acid: or aulphurous acid. (11)
[Na] OD
Sodium hydroxide (111)When sodium hydroxide diss 'alves in water, there is no
change in the bonding except that the sodium ions and hydroxide ions are separated. However, when sulphuric acid dissolves in water, ionizat- ion taices place. producing hydronium (or hydrogen) ions, hydrogen sulphate ions and sulphate ions. #2504 + H2O
H20*
+ ESO
'4
HSQ + H2O
·H+O+ + $0
: 九畴,BBC新聞- 新聞簡報 【空中常用旅游英語·芬·
一時十分:李語長
- 及時座 - 廿分 - 毌林设
大步,卅分,古今奇「
#
. 六時,新聞專輯,,天氣報部,一脚鐵
十時,鬣播「職業【卅分,香港辦交易所(時刻》,卅分,新聞
十一時-十分,夜一律
東交易所今日下午我市分,新聞簡報。
十二時,天氣熱告「奇遇記」铜片痛。
七時,新聞簡報,
新報
寒」升集,卅分,新聞
簡報,演塔誌。
綠邨電台
[及天氣和幕。
八時 新聞報
_七時 -「根點與角
選
七時,生活風水,一度」,五分,「聽前
天氣帳告,漁民天氣報
卅分,天氣,宗教節目」:大哚慣。
及朝改,無音樂及時代,卅分·新聞簡報 六時,新聞、天龍街-(图栢廣播集誌
,
四十五分,消長甘露
KETBANG
BANG!ZEN
八時十五分,郎日
,卅分『相依爲命,
在新州及待鳥e. 七時,每朝七點。
一身預ī,福音掛,
九哮,「歡樂今徠
·緻術廣誌)!卅一分,
三十時卅分-最强新
MBC特馬節目。
廣播恭
九時,京曲題。
十時卅分-空中
十時,新聞簡報, 瑞緻廣播集誌 },卅一
地,批發,天氣,長保片。
九時,三笠小庆 開報導,四十五分 [
曲。
分,新聞簡報,一发
千一時-隔光十二
廣播。
·十一時-新聞簡報
十時卅分,漁民天
+1時,客咖重重的特長片!苗寨版家。
一時-新開,十分 天氣報告,想曲,甜,十五分,小球世界-
五人分离十 片卡
·曹所日,十五分分,新聞簡訊-(醤试|卅分,天氣,史故史,片:分,專用
,下午抱摔。·
時代爾,分 萬時一片集。
一卅分,天氣。
二時- 心曲寄,
無錢明珠台 ,卅分,天氣,請惠
十三時,妙韻寄心 日播映定華,
八時,轉播BBC「友記」,新闻簡報,四時十五分,音量
藏韻
生聞卷,
[S] · ## - TER
五畴-「 THE S
六十五分-「我
-TMANY
| 節時,四十五分,德育 WLVES OF
分氣
消節曲
息目。
三味 四分
「預告 。
大時,綠代之音,
_時五十五分,單
跆是片:天凿游快。
「PATRICK』。
ㄧ九時十分,「黨籍
開及天氣報導。
八時四十五分,新
名片。
天氣報告,一橫甜心·一街格偷得學生中縣萬捕快,四十五分,快完車。
。
三時卅分,七俠五
十二時十五分,「
- 卅分 - 湘民天黑霸出一分,拉時,下先梅五分,米雪片·十五分
正告時壓
樂
兇手。
卅五分,魔的影院:鬼,偷巴第,世五分,對
七初六
一聞及天氣報告,
六時,小黑发,卅一角-五十五分,自己
七時女五分,蟻點
,快!】份,一身是
奚角,卅分,新皮 ···
二時,新聞天氣及换牌片。
佳藝電視
八時,民歌選唱,
五時,新聞簡報,分,新師簡報栉
升分,且级龙門「飛行 (爆掉空中俱樂部》,
|新開簡煜、戰時刻。
】:江南北。...
•五毒卅分,「木偶
「連【世界」。
̧四時,櫃長片:
片:「烩飛燕」。「
」,五十五分,午間新
十二時「行降
7
|_ HISTORY........
PAPER !
One hour and thirty minutes
8.30am~10:00 am.
This paper must be sasworod in Chinese
考生然在否用牌到感就上了稍日/过轴;執下陇上運寄以維之嶼頭名轉,
(一八六九五二)
ANEM CON19)
ARKR CUBJG).
乙 ̇
試國和法國新主頁淇明鸚常泥如何於一九二要哪些據其於一九三九年
七年
HONG KONG CERTIFICATE OF EDUCATION EXAMINATION- 1977 歷史
試卷一
LTAME+RETIRE 半鹹兼必瑙然有沈作署
Afterpi TNO (patika, laka
newer shiple char qurubon.
RESTORY
PAPER I
One hour and thirty minutes
1.30.-10.00 à m
'This paper musË, answered in English, ONE is mond of the mentions from wiridir yots well. “
Caddy hand là vund the awewavem caerfully, to spend notes Limy planning Chair wwers and wangt each thaay ur portable pho
"Indicate" which motikon you how weed by Wrig the letters "A", "B", "C" when
the trity of Subject/Paper' on it comes of your answer booll.
A. 1844-1953. *
SECTION
What we the lives band, the 48-downghening Movement in Chim from 186 vi inte 7 N Describe reforma undarisken and examine their ranks up to ris
Theon of Remien power Bin Zaest Anda dan Dam second half of the vechath centery.” abouring laur it lad to open contact with Japan in 1906. How did Howe's victaty affect bari Phong mich thỏ 1 số nấm cơ 201910 ở
Derg arean and porn one their icapaci na 100 development of iHE
mand in Chi
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The Way Fuck Mommenier | 1219) The Slats Loulant (|936). |
Why did such querernment fail to Japan berweis (2) mid 1931 ? Whàs were the affect taen he lovespa poster of laget after 29032-
Describe the decat propem made by Germany Balon 1914, Thơn hów neoncutic developisovate
à Exempa burity (it punyod rowerbung ko da u York of World War.
Cache
su peale ka shtaka international co-operation froei, eglio na 1979, 4alain why They mesoped a Padove herong cha | Ad
Kaplata befly what is man by Pecin. Som Jaw Matoties ciete na parter in 1922 and give u
lepotices in May bes
Tower Wachi War 11,mancti letu le crearon of the Europea Consane Market (EFC) 1991, resep of the EC why the BPT Asociatian LEFTA
NCTION C
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The Used Several kapcion, 1860-1963
The Unked archy wont trachein perth sok devlopment Crane dat vnd of the Chef War)
and today, the bondialing of endleɔɔys tool, shy as matom of the Broasiat.
10. Melody duces the Sameign policies of Present Therm Bonarvak (190) + 2909) and Alan Tone-
13. What square dà cet American General Lake to acne the problemi chewed by the Devel
2420 7
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卅分 - -
憐曲。
麗的英文台
四時新聞簡報,
八時十分——
二四十五分,(六新聞天地
目相歌嗨,與第1台節 香港一台 日的陆光》。 七時,香江之最, ,十八謝C座。.’報告。
一日上午股市行佾t廡 十二時- 新聞專輯 ,卅分,漁民天氣報告 年青人時間、天氣上神兎卡茹片集,麥砹 五時,新聞簡報,【鵡片嫩,五十五分,萬 陈、神經貓、小数请卡
【韓教平人時間時四十五分,教育電視
卅分,新聞簡報·[0
五時,兒童世界。
分類發
萬卡白
卅分,我爲你點唱。 施公案「披在招靚」,
間珠 續卅 俄交日告
·新你,廿所午带
卅聞祝新分今肚酱:
教你午烤
卅分,節目與第二台相 十14時至下午六味 四十五分,不美由你傾吓 偶吓,卅分,新人時間。 三時,新旧簡報,
九時,太平山下设易所今日上午股市行卅分,新聞報!(獎 . 十時,少年故事,六時-新聞恨報,及天氣簡報,五十分, 十一時,民間故事,(以維爲你祝商)。年青人時間,卅分,其他時叶玉粉,未擁 天氣報告,香港府你交(尚蟹年青人時間),随探險船。 |聞簡報,一擞續潁吓],一七時,新聞簡報,台歌唱出 决 二時,新聞簡報, 新游簡報、一年靑合集,四十分 - 香港 西正川時間・卅分,新費。 近鏡~五十分,一九七一
一律·四十五分,新聞 六時廿分,生活的
聞的
* 空中俱樂部,卅分,
天地,卅分,大城市小 六時・新聞及新湖新聞簡報,⺥繼續空中八時,新沿簡報,
·故事4.
七時,新開及「新
(谳祝空中低樂飾)
四時 - 新聞簡報
第一卅分,新開簡報,一蹲唱。
《南之窗」,十五分,作劇中,天氣
家與作品。
部籣 天椒 五
空時 俱新
銀市 樂開
源告俱 新
分一談,告天
·交告
新數
天氣報告,流民天氣報
掏槍,五十分,午夜藍 影:質睹的。 一時卅五分,全
天氣報告,世分,可為 十時,新聞報導、
九時,新聞簡報 無綫翡翠台