REFERENCE LIBRARY
2.2 JAN1974:
CITY HALL
育教僑華貞三第張五第日十三月二十年岳発
WAH.
YAT PO
報日僑華
二期星
日二十月一年四七九一公年三十六國民華中
1中一部分之氢級金鍋置而成之酸性氧化物 通来性氧化物
美1974中學會考試題預習專欄
1974 中學會考試題預習專欄
堅道書院主
化學科(甲)
林景源
測驗六
硫酸铅()硫酸鎂 你釀查缺硫酸铜 (D)硫酸铜
吝舉ㄧ方程式為附表示之
甲部,40%全答
(B)铵垫
确胶垫
(D) 醋酸鹽())以上均班
7將酸和與基通量混合,两者的持 桂间天向成為頭和水的作用,稱為
(A)中和(B)熱解離
TACE & CLO (B) Cl 10 co
☉實驗室中型氧氣之氣氣回用土氧
本身支為
(E) CLO & U03:
二氧化錳用作
1.選擇題:120%2
2如果應很完全,则(厚可 你將小%的HCL与10%的HC混合
(D) 13.3
成127%,则液本混合重量比為
(A) 3-2 (6) 1-2 (0)2=| (D)2:3
3欲除天氣氣持以下列何物品吸收 4载(银可容於
(A)式式(钢志泡样价酸
(C)亚硫酸钠溶液
硫代硫酸钠溶液
((E) 氯化銨溶液
@粗製的食盟易潮解且带苦味是因
LA MgCl2 2 NA, CO,
CCY H3PO
(D)HA=O_
(B) Na2 CDs XL Ca Cle
(C) MyCl, I M2(HCO3)
10) Callz & ry Cz
生
Đi với
(E) Call2 & CIMCO3)2
3n
3n
m
2m
一瓶氧扒中则生变化的發光,同将黑 煙產生,這些黑煙是
(A)松節油之垂氣(B)
(D)之氧化碳
(E)一種新的碳氢化合物
HCLO
(EY NOT
) 當酸加入水将那一樣生成物质
(B) N2 (C) NH2
3過乳酸鈉鹽的分子式是
(A) NaCl) CB) NaCCO2
PhCl+__CCC+_H_O_CU_
上運う程式会
(C) NACE; (D) NaClO. (E)以上皆非
(A) 2,1 2, 2, 4, 2
(C) 2 m 2, 2, 2,
3用裁纸漂白衣服必须要用水,這是
(B)從水中得的氧可漂白
(A)武是氧化劑
堅道書院主
化學科(乙)
CHEMISTRY (11),
Suggested answer for last week: In the Solvay.process sodium bicar bonate is made first, by saturat⁑hg a solution of brine with ammonia an and then treating it with carbon. dioxide.
First stage: Ammoniation of brine
NH3 + H_0
NHOH
Second stage: "Carbonation.
H2CO3
NH OH.- NHRCOg + H2O
C1 + NaHCO
NaCl
NH
Sodium, bicarbonate separates out asi a white dot; which is drawn off filtered and washed -free from: ammonium:compounds.
Third stage: Conversion to sodium
carbonate.
-> Na¿CO3 + H2O + CO2
Carstallisation from hot water.
produces the decahydrate, washing.
内實驗室製裁特欲得乾燥水純桦 oda, Na_CO-10H2O 戴戴,應以水吸去
去欢就
M.Woof washing soda. 286 its. equivalent wt.
143
M.W. of baking soda - 84 its eg
lent wt.. =84
Let fraction of baking: soda by. wt..
5氛遇氧化或生的心理是
硝酸较遇岔鹽溶液所生成 in the mixture be x. Thus: fraction 无白色沉澱是
of washing soda is 1- X
Therefore total no. of gm equival
ents in 2.34 gm. of the mixture is
2:34 (
乙部160%仕擇回题
7解释下列各项:(15%)
(1)一學生收其两瓶氯乳之纹入 一樣的颜色币,具一般漂白,其一颜色
(6)藍色石蕊試紙放入氣水中专
使吸入裁氣货,若能立即入裁裁
2 (a)如何製的下列的鹽。(10%)
(7)確酸鉛製硝酸鉛 胡酸鉛製氧化鉛
(6)下列每一项舉一例以程式 表示之間
((1)酸与盟文化
4(a)如何以简单(舉了法控制下列各 項並附有開程式:(10%) 戴化钠及裁酸鈉
的性質,下列那一次是错
换的!!
感
(5)水可使裁解離
(5) 乾燥的我無漂白作用.
16th
(A) Zn (B) My (0) Cu
Fe MEX AL
過鹽酸就是
(A)液体氢化氢 (8)氯化氫氣体 嗅题,125%
(C) 氯化氢的水溶液
<E>含鹽和碳酸的混合溶液
氧化钙、二氧化硫、氧化铁 化硫,氧化銅,二氧化氮,
(42)
(3)姨赖有何特性? (h)
5在天平的两间室中,各教育同等 重量的鹽酸的境标,用一個境标转 投進一塊錢(中為6.5元),向另一個 氧燒杯投入等重的鎂(6.5克,天然定量
少
84 143
However, the total no. of ga alvents le aleo given by
30(0.7)
1000
|Thus x = 0.4034 and
= 0.5966
carbon in an Insufficdent: supply of air. It is used in
making paint, printer's ink.
and boot polish.
Coal 16 a mixture of compas ndi of carbon, hydrogen ant :axyw
gen, together with amall amounts of nitrogen, sulphur
·and phosphorus compounds. It was found about 300 million years ago, plants of great. forests, died and were coverec with sand and mud. Bacteria caused the vegetation to decay, and then heat and pressure changed the decayed material to coal.
Chemical properties:
1. Carbon burns in oxygen or ai
forming carbon djoxide:
IT: the sunply of air is limited carbon monoxide will be formed.
20 +0.
200.
2. With hot, conc. sulphuric acid,
producing carbon dioxide, water and sulphur dioxide:
+ D
2H_S0 ->CO2 + 2H1_0 + 250.
3. With hot conc. nitric acid, car bon dioxide, water and nitrogen peroxide formed:
C+ 4HNOţ→ C02 210 4NO.
4. With sulphur vapour, red hot cal
bon, can form a volatile liquid called carbon disulphide:"
C+25:
As a reducing agenten
PbQ+ C
Pb + CO
6. Combines with certain elements
when heated together
carbides, eg.
3C ở cáo
3C
Ca020002Ca
forming
+ CO
'S10 180037 SIC + 2CO
Oxides of carbon
Three oxides of carbon, all of which are gaseous at ordinary
| temperatures, are definitely known. carbon: dioxide, carbon monoxide an
Therefore % comp. by wts of washing carbon suboxide . 40.34.
soda is 59.66 and baking sola is
8. Carbon and its compounds
Carbon is found in nature. in bop the free and the combined state, e+g. carbohydrates; hydrocarbons and limestone etc.
Allotropes
Carbon monoxide
Carbon monoxide seldom-occurs free: in nature and then only: in small quantities. Minute traces are fount in air, volcanic gases and tobacco smokes, and also some: quantities are found in chemney gases and in the exhaust gases of internal combustion engines and about 10% (1) coal gas.
Allotropy applies as to a pheno-It is a colourless, odourless, very menon in which the same chemical poisonous gas, insoluble in water, element: axists in more than one alkaline solution but soluble in a
physical form in the same state. solution of cuprous chloride:in These forme are called allotropel ammonia to form CuClCOR_0 therefore "or"allotropic modifications. In this solution can be used as a goot
carbon, there are three different absorbent, for the gas. allotropes
A. Diamond is a crystalline.
form of carbon; its value is due to its great hardness, the dazzling brilliancy of: its. permanency. Apart from ite uae 'aswagen atone, diamond. is used for making rock-drill. glass cutting, its powder.. form used for polishing other gems..
B. Graphite is a crystalline (
flat plates.), soft, greasy, grey-black solid, which is smooth and soapy to the touch It is a good conductor ofi heat and electricity. ̇Graphite is used in the.
manufacture of lead pencils as a lubricant for heavy machinery and for coating ironworks to prevent rusting. It is also used for making crucibles for emelting and: electrodes.
Amorphous carbon
Wood charcoal is made by the wood, destructive distillatio of wood, it is a black, poroth substance of very low apparent. specific gravity. It has a great power of absorbing large quantity of gas, theref fore, charcoal finds great uses in the making of gas masks for the protection. against toxic or poleonous. gases, other uses are making. gum powder, in water filterj as a crayon, and for purify- 'ing oils.
Animal charcoal is the residue left after the destructive distillation of bones, which contains about 10-20% of care bon and about 8% of calcium and magnesium phosphates. Its chief use is for decolorizing raw sugar solution during sug. ar refining.
Lampblack or soot is obtained by burning substances rich in
Chemical
al properties:
1. A non-supporter of combustion,
but burns with a blue flame: forming carbon dioxide:
200+
2002
2. A good reducing agent--oving to
its tendency to burn into carbon dioxide, carbon monoxide is a powerful reducing agent,
Cuoco
3. Poisonous nature
Cu
The poisonous nature of carbon monoxide is due to the absorption of the gas by the haemolabin of. the blood to form the bright red and stable carboxyhaemoglobin to the exclusion of oxyhaemoxylobin. Carbon monoxide thus slowly dis- places: oxygen from the, blood and the victim eventually dies from oxygen lack)
The gas methane, occura in some mines and can cause explosions. Usually, an explosion itself dees not kill many miners. However, it forms carbon monoxide which pois. sons many miners and people who. try to save them: 2CH + 30- > 200
Uses of carbon monoxide. Carbon monoxide la an important conetituent of coal gao, water gas and producer has. It is also used in the refining of nickel.
Question for this week:
(a) Describe, with a labelled
diagram, how you would pre- care and collect reasonably pure carbon monoxide.
(b) State briefy four differences between the properties of diamond and those of graphite
(c) Write out in table form five differences in properties between carbon monoxide and carbon dioxide.