LAM SHIU WAH)
實西夷 五
日二十月一十年午丙膺室
WAH KIU YAT PO
五
育敎僑華
必解联立方程式伪。
得6=1
1得C=芝
中文中學會考試題預習專欄
代入3
得
•HNO, NO, += H2O+ 10
核 左方右方
大九一百公宋五十五國民中
联英文中學會考試題預習專欄
經濟及公共事務科(八)·林少蘸。
化學科
H
4 4
4.P.A(8)
(八)
̇林錫衡·
4HNO34NO_+ 2 H2O+ QM N 4
(19.(a)What is wholesale trade?,
4
化學複習題八
1.2 12
【複習項目
氯及其化合物卤素 及已複習項目
[填-
(製屋氣容要用=氧化錏但其使用不
同製氧時用作 劑製氯的則用作1
(4) Cu + HNO2 ~> Cu(NO3) + NO2 + ̃H2O ̧
設為 a Cu + b HNO3→C Cu(NO3)+2NO+2N_O 考慮:Cu:
=2C+d-
=6C+2d+ e
H
b=28
3
N
16
01 36
劑
(2)湿的藍石蕊試紙遇氯時變
設
色。遇氯化
時變
色証明前者
有
能力
「(3)四種滷素其活潑序為
© $b=2 /
3得:2 = 2C + d- 4得
= 6c+2d 鮮36得C=d=1 代入1得Q==
•Cu + 2HNG→Cu(NG)+NQ+ H2O\
(4)欲檢
氯化物溴化物碘化物可將溶液 分别加入氯水及二硫化碳,若無特殊顏 色呈现的是化物呈棕色液層的是
化物呈紫色液層的是化物。
Cu + 4 HNO → Cu(NO3) + 2 NO2+ 2 H2O]
上二題所用方法称為 覆核 代数法,較繁但一定 可得出结果适用於較 繁的方程式
左方右方
Cu
H
4 4
N
4
4
工平衡下列方程式及填-
空格
。
12
(5) H2S+ KMnOn+ H2SO> K2SO4
價
(I) MnO + HCl → MnCl2 + H2O+CO
(2) KMnO+ HCl → MnCl + KCQ + H2O + Cl2.
原子價委法在氧化還原反應中 元素之原子價昇高必有一之素原子價 低且二者变进之總值相等可利用 平衡方程式。
H2S被氧化為 +2.
Mn之原子像自
價轉為
Mn之原子價
價轉為
僧
自(1),(2)知HCl 是 後必生成 M
刺與
劑作用
$之原子價有
價轉為一 價
KMAG 被还原為MASO MISMA+2
M5 Mn
(4) Fecl + Cl2 → Feces
5S+2MT
Fe之原子價自:
價轉為
自(3)(4)知(C)是
與
劑作用後
即 5 Hz S + 2 KMnO¿→ 2 MnSO4+ 5. S
•H2SOU
+ K SQ + H2O
136)
(3) SO2 + H2O+CO2 HCl + H.SOG
生成
III實驗室製氯與氯化氫有相同之装置試给
出之並解答下列各問題,
二者之反應方程式
(1)分别出 =
法各如何
(3)何以用如此方法收集
(4)欲得乾燥氯氣應通過何
(5)欲製鹽酸應如何處理
5.平衡方程式
複習題七解答.
5H2S+2KMn0, + 3 H2 SO, → K2 SQ + 2 Mn SO4 8H0+5S
可依上数题覆核之一
(6) CO2 + KOH →
HKCQOg + KCl + H2O
→ ka
CO 元素单独存在原子價視作,
20(((+5價)一部份還原或 氧化成K203 (Ca
kce (ce-115)
SONG KON
平衡方程式有幾種方法同一方程式可用 幾種不同方法去平衡,但原子便变遷法 只适用於氧化還原反應
U) B2O2 + H2O. HBOg
* B20g+3H20→2H3BOG
因左方B為2
右方H為6
2 H3 PO, + 3 Ca(OH) → (a2(PO4) + 6 H2O
覆核:
ce°
ce
a
+5
The wholesalers buy in large quantities from: the producers or the manufacturers and sell in smal ler quantities to the retailers who in their turn supply the individual consumer. The wholesalers { know the demand of the goods from the market and always advice the manufacturers to improve the goods; They also finance the retailers with a long-term credits. Sometimes the wholesalers are responsible for the advertisement of the zoods.
「(b}What is retailer trade? Y
When the businessman ontains goods from the wholesalers in small quantities and sells them to the individual consumer, this da called the retail trade. The retailer is an individual shopkeeper or small firm
20. What are the functions of the Chamber of Commerce ang
trade associations?
Their functions are as follows:-
(1) Issuing certificates of Hong Kong origin,
(2) Publishing trade bulletin and supplying trade-in-
formation to foreign lands or local firms,
(3) Maintaining a trade reference library,
(4) Dealing with trade inquiries from abroad)
(5)
Arranging display of Hong Kong goods to oversea
trade fairs and exhibition and local exhibition. (6) Promoting trade and industries:
21.what things must you consider before choosing a career
There are in general two kinds of work. A career is usually taken to mean a special kind of occupation for which a person prepares by a course of training and chooses it as his or her life work. A job is any kind of work to support one'a living.
To choose a career, we must first consider ours own interests and aptitudes. If a person is interested in the work, he feels a sense of satisfaction and... achlevement. A person can overcome this difficulties
easily. Aptitudes are also very important because
careers vary in what they demand of the individuals. It is not worth while to take up a career merely. because it gives apparent security or attrative pay. All professions require taking up a course of training and success in certain examinations.
"Advice and suggestions from experienced persons necessary. Parents or teachers' encouragement should also be considered. The financial position of the family is also a very important caneideration. Sometimes family background and circumstance wi13 help one's achdevement..
To be a doctor one should be good in acience subjects, at the same time one should like helping "others. If one dislikes human contacts one will make ra good research scientist and medicine can not be
one'
ele career,
Finally, effort and determination are very portant, one should make use of the opportunities. 22. What special aptitudes and qualifications are required
to be.
solicitor.
He must have a profound common knowledge and must be able to see both sides of a question. He must have a clear and logical reasoning. He must have the ability to express his thoughts and ideas in both speech and writing. He should be honest. His judgement must be sound.
LIBRAY
REX
1+5@\CO° + 5 CQ°-> CQ*5+ 5 (97
五計算題
→ KCIO, + S Ker
6 KOH.
KO
13 H2O
·3H2O
(1)解:混合物中銅粉5氫無作用,只有氧 化銅5之作用而成铜,作用後所失重量 即為氧化銅中氧之重,
覆核
氧重, 2.00克
1.75
0.25克
左右方
氧化铜含氧
79.5
B 2
故氧化銅重應為:0.25克+s=162
H 6
O
6
6
(2)HSPO4+ Ca(OH)→Cas(PO4)+H2O
混合物中銅重,200克-1-24克=a.76克 混合物之成份是
因右方Q3
因右才P2
氧化銅 铜佔
62%(答)
38% (答)
因左古H6
(2)解 NaNO7
857
H2 SO, → NaHSO4 + HNO3
1981
637
工 二题所用方法称為
觀察法 其優點是關 使,但對於較複雜方 程式會無所适踨:
左力右方
H 12
12
59.3
P
2
2
Ca
+ m
14
(85
(3)HNO. → NO_+ H2O + O_
3
3
何得纯HNO.59.3噸 Ep 30% HNO 59 30-30%
= 197.7噸(答) 需用纯 HHSO4: 92.2噸 即70% H280978-92.2噸-70%) 131.7噸(答)
設為aHN0g-> b NO_ + CH2O + d O 考慮
(3)解a設硫過剩只用x免
→FeS
5=5.21
2
硫只有4克不足)
32:
+C+2d...3
任設一個予某一未知数最好选取各式 巨最常見且馬上可代入算出别值而不
詖鉄過剩,只用4克
He must possess a certificate of Matriculation or a required G.G.E. Certificate, He requires to join a Law firm to complete his articles of clerk- "ship for five years, and to pass the Intermediate:
and the Final Examination of the Law Society.“ b) A teacher
A teacher must have a sense of humour and must be able to mix easy with young persons. He must be patient and puntual.
He must have either a school Leaving Certi- ficate or Matriculation Certificate and then join the teachera training College for teacherb training courses.. If he is an university graduate, he is: required to finish a Diploma in Education Courae in Hong Kong University./
A nurse:
She must have a good character and must havey sympathy and interest in people. She should have
a desire to be of service. She requires to have a patient disposition; an even temperment and. sense of responsibility.
of She must pass Hong Kong English School Certi~
ficate or the Hong Kong Chinese School Certificate
with a credit in English.
Questions for 9th issue:-
23.(e) What are produceris goods?
(b) What are consumers) gooda /
24.What is captial goods?
25. at is capital? In whau manneri1s-capital produced,
saved, maintained and consumed? (
26. What are the advantagesio, large-scale producation?}
$32
4 =!
鉄餘(10-7)克=3克(答)
Fe S + 2 HCO .. Fellat Hast
88K
(1+4) 88
3=4.25克(得H-SP)
Hela Fell,.
M2
志(得H-堂)
Page 20Page 21