日四廿月三年九七九一公年八十六國民華中
(ii)(1) Fe + HQSO/ FeSO4 + H2
mass of water formed
5.013 g
刊週學科育教頁三第張八第 日六廿月二年未己屣夏
1979
中學會考試題預習專欄
mass of M
84-(12+1(x3)
84-60
24
WAH- KIU YAT PO
CH=CH
報日僑華
六期星
4.4436
H-HSOF
CHCH2SO
(vi)
文化
單
(##)
8
明德出版社朱宏林提供資料
Chemistry (24)
Reginald, W. CHU
Solution to Q.
(a)
MC03
2HCl-
MC12
CO2 (ii) This is to saturate the
liquid in the flask with carbon dioxide first so that none of the carbon dioxide liberated by action of hydrochloric acid.on'the: metallic carbonate will dissolve in the liquid and the volume
Add dilute sulphuric acid to the mixture; zinc will dissolve:while copper will remains unaffected. Filter and the copper will be obtained as the Bolid residue on the
filter paper.
Zn + H2SO2 → ZnSO4 + Ilg
(ii). Bubble the gas mixture
through cold, dilute
sodium hydroxide;
dinitrogen tetroxide will react with the alkali. while oxygen will pass
unaffected.
2NaOH → NaNOg
NaNO3
2820
of carbon dioxide measured (iii) Bubble the gas mixture will be more accurate,
(iii) The reaction is fastest
at the very beginning: of the reaction.
(iv) It is because. the reaction
bas completed and all of the metallic carbonate has been used up..
(v) The maximum volume of
carbon dioxide obtained is:
1120
(v1) No. of moles of
obtained:
1120
-22400
0.05
According to the equation
MCO3 + 2HCY → MCl2
of males
MCO
of moles of CO,
obtained
0.05
the mass of MCO2 used
La 4.2 E
mass of
MCO3
0.05
84g
one mole
That is, the relative mass
of MCD, 19
Hence, the relative atomic
再淇瑛 出是取在替將多術·
雜器找立察蕸 臨所久起成寧 在
在火改人筆迴宬將是蹅素進衛 外位能模投股 ·使的來激 史相 的方 的量或射颈粗慎武,光陳伯今面 日,追彈的的可器步武饰, 方然碌的射肘以,兵器
席的的高寒猛防
鹽瓶卿疵發乃在,代樂
單選化
溫勷可
贊的作察
的藥,覺感能作,多
through: sodium hydroxide solution; carbon dioxide will react with the alkali while nitrogen will pass over unaffected.
+ 2NaOH →→→ Na2CO + H20
(iv) Heat the mixture gently:
in a beaker; ammonium will 'sublime:off while sodium bromide will leave behind.
NHCl(s) = NBg(g) + HCl (g)
Add water to the mixture; sodium carbonate will dissolve while calcium carbonate will not. Filter and recover sodinn carbonate from the filtrate by evaporating it to
dryness.
(vi) Heat the liquid mixture: a0
as to distil nitric acid over because concentrated mitric acid is volatile while concentrated..
·sulphuric acidia non-volatile.
(vii):Paas the gas mixture
through concentrated sulphuric acid; ethene vill réact with it to
form ethyl hydrogen sulphate while ethane: will pass on unaffected.
Op warming the ethyl hydrogen sulphate, ethene will be liberated and
recovered
(viii) Pass the gas mixture
through powdered. palladium; hydrogen gas will be absorbed while carbon monoxide will not. On warming the palladium powder, hydrogen will be recovered.
(ix)
Add the solid mixture to some carbon disulphide; sulphur will dissolve while iron will not. Filter and evaporate the filtrate to dryness over
a water-bath to obtain the sulphur..
(x) add the mixture to some:
caustic soda ori caustic potash; zinc(II)oxide, being amphoteri will dissolve while magnesium
magnes oxide will not do 80, On filtering . magnesium oxide will leave behind 'as: the residue.
ZnO + 2NaOH + HOO
Solution to
NagZn(OF)
(1) (1) Some of the copper(11)
oxide, turns from black to reddish-brown powder due to the formation of copper powder.
(2) Anhydrous copper(11) sulphate turns from white. to blue due to the presence of water.
(ii)(1) Cud
(2) cust
and, oxygen in water formed
#4.443 E
mass of hydrogen in water formed
- (5.013- 4.443)
:0.057g
Hence, ratio by mass of
I to 0 in vater
= 0.057 : 4,443
1: 7.79 1.7.8
(viii) This is to ensure that
any water detected must come from the reaction between copper(II)oxide. and: hydrogen gas.
8
A saturated hydrocarbon is a hydrocarbon (i.e.
a compound containing only hydrogen and carbon atoms in which all the atoms are joined by single covalent bonde.
(ii)(1) Ethanol, CH CHLON;
· (2) Propanoic acid,
CH3CH COOH;
(3) Bthene, CED
(iii)(1) They are:
and,
Cu + H2O
This is to prevent the moisture in air from entering into the apparatus.
(iv) Mass of water formed
during the experiment
gain in masa of copper(II) sulphate tubes
(37.375-32.362) g
5.0136
(v) Mass of oxygen in the water
formed
– mass of oxygen taken from
copper(II) oxide
loss in mass of
copper(II) oxide boat
(16.590- 12,147) g
發現一個練而扁的環、槐妝木品,這是爽術家對該淆的概念。
H #
C1 C1
2-dichloroethane
Cl
1,1-dichloroethane:
They are known as: structural isomers because they have the same molecular formula but different.
structural formulae
|Solution to Q. 36
表船
A is iron powder, B is hydrogen gas; -C is iron(II)aulphate
crystal,
D is iron(I)hydroxide; E is iron(III)oxide;.
F is iron(III) sulphate;
Gis iron(III)hydroxide;
X is sulphur dioxide i
Y is sulphur
幾乎獲得相當十年來有價值的發現。j. 比過去由地面觀察所獲的資料,大有不同。 吳國榮備港航得米太空染接射林星的甜香後 太空科學家斯東說:「在這兩個星期,我們
艘機器自操作的太空箱,偵察賀萊的群星 然 等候批准通過。這就是預計在一九八六年發射一
·梅理又表示明年尚有一個具價值的太空計料
. 木虽其中最大的四盤月球八木星之萧县)作于一 ,在一九八二年再派遣一艘更先進的太空船,過後再繼續前澹,與評賞癒星二號會合。 在太陽系內美地球最接近的月亮和火县,目
文學家與和路爲名,種時它會在木能對派的大氣
畫家的木星環概念 它環端木基的軌道腿已接送,他它每次都接近骸,相信對火星探測的潛點,不會停止很久,藝是, 一項與以前完全不同的,對木星的探时和分析, 證據證明它的氣候而史是不斷循環,所以我們打成文社,若一直影幹一來,一種彩的尼羅斯戰 該院主任梅理表示。伽利陆號是一洪畲式,進行的不同土地估是令人感到政路;同時亦有很强 正在研究的「帶隱粒子防官執,系膺在十五年 在加州普岛丁納城的噴射研究院是負其䄉治·谢政預算人员亦未有美趣草没計劃再登陸火星。西子帶來高度準法,而一顧而他們的可靠性,可 伽利略號太空船,及操撥號喦一戮和二號,撻 梅理說:「火星上有許多地方是我們陌生的,它北阿」。目前褓點能勝過人類。一位前糰拉就醫院的发
,蜃內放下「具偵察性接器,並會在首次在太堅要求對產月球所未获历南|
次棄密接構,這艘先進太空船是以著名義大利天,前却没有進一步的偵察計動。過去兩年來,太空 地區,可惜這項計畫被白宫否决了,此外政府的
-四個大月亮的其中一個,得到的萬有引力之助, 目前却是如此。
采,現已在試叢中,
佩瑞以彈控,以巡駕
(傳區令外的飛先 颥過
電腦遙控未來戰爭
電子武器破壞力强
NASA.
在油希方面電腦按一連皮光學感壓儀器,準一爭。現在,美國國医部
..這種作戰棲飛,並一,將會使下世花的戰
針料成正在生產的武器
一個傳統武器的小部份,知歡看訊息或理機變,,爲現代取爭,已經
强算华軍体短,稱的,
镪輯一,不作的武大航程 可爲器
力赫冠却 盝 壓百暴研武目,以的
秦子曲,能分不完器
因說戰使您力四但專的,確
重新作而國示份本地向 綠置
瑟激的豆防,,僅獻武一個反感
這些武器不低速低步向目標進擊。"
開拍日本
提起,樂助百彍泥了
龙,料的察就止可 伊遜停 陣,,不面新孫類
的種類
代管理 器及包的,反
智梃
科學養場在寄至早系統化腦電室驗試
蜜片帶比好近十試開足1
有色則及返,星的腦的上網致像擬五廳銷的
障的形經地保的·立
標液狀钱球
三。
“我跟府採年為計,這兒回本就試必爾。來本人化數跳拉
再 藝自语,比用以改 航加壓的位們務不旋來克國政步工分大融歌
海利。
光者遍:课手以成地地巡财衖對也不一簕作歌論之試了去工,從底用
*渚號
方可的所式西的提府闻作之村工壅·刷 化慫加 藏的來自督
來正精本騶上的敌了邊時低,生的鳥 新 樣集三 五作研意的哈 現在到。力升藝安四院都有確了成,的不敢管 年免扰熊
·斯彼氏息克王投,亦在去年底棄助一
出現,但知帶捻小。 混合玄武岩的黏性溶液。有些君漢出高達一百公里長及十五公里裡,在夏威夷亦有商機的火山口 由其连起散致黑色的液棲莉直經二十嘎。這火山口是火山的萤火以形凝剂,而黑色的液量大概是 八度。其習度約一百四七噬,很明鹛地震到細微的特徵約帶點二輛,圈片置示不規則形狀的火山口
|一號於拍攝該衛星時距離它一萬八千四百八十產。道地帶之中間爲南再六十占及經親三百二十 ,
最接近木星的衛星
trioxide ..
注的星星
安籤的
(2) 2FeS0, 7H120
Fe2O3 + Sun
(3) Fe203
Fe2(804)3
(4) Feŋ(S0,) 20
2Fe(OH) 3
(5) FeSO + 2NaOH
Fe(OH)2 + Na2SOL
(6) 2Fe(OH)。
Fe ̧05 + 2H ̧0 (iii) Use carbon monoxide
(or hydrogen or carbon) which can reduce iron(III)oxide to iron,
+ 300 2Fe + 3C0g #203
The gas obtained at the cathode is hydrogen and that at the
v node is oxygen.
(ii) At the cathode:
[2H* + 2e
At the anode::
408 → 2H,0
(iii)(1) According to the
equations in (ii), for the same amount of electricity
used, number of moles of
twice as the number of mole nf oxygen liberated. Therefore, according to the Avogadro's principle, hydrogen gas should have a volume twice as that of oxygen gas,
丸 en gas liberated is
(2) This is because both hydrogen and oxygen gases, are slightly soluble in water, but they dissolve in water to a different extent; so the 2:1
(H2:02) ratio cannot be
practice,
obtained in
(iv) The conduction: o置
electricity through dilute sulphuric acid mainly depends on the mobile ions in the liquid while thát in a copper wire is mainly due to the motion of the
free electrons,.
科學
第三期
航海家一號拍回照片 科學家深入研究木星
是时的
談,有扁平環所呷39
人們獲悉木星的新面鏡。 的裝飾一簇,引人入勝。航海家一號,接近觀測預科不會被否决, 星衡风,掛在天空閃閃生光,正如塑誔節日夜間 細地形區。梅照開爲這個計劃很醜興趣向低值, 基)中最大的一顆,進行收集安料,這十個冰的軌道,然後透過它的盤潢,議取整個表面的洋 杭海家一號並對木星十三個月球八木风之窗 太空船携带一具先進的雷邊測系統進入 兩倍中。同時這種帶狀極光,橫過天空。空計劃。這大計風預算在一九八四年實施,由一 溫所立出的光,低木座北琳的光帶比地球上的是和國會,會批准美网太空杯袅展關案闾金窟的太 世界,凌七勁讓酚的要厝所迷惑 - 救且集土至↑ 木星的种鞑辐射架和磁力塲。」 ,係一個氣體,被姬色和白色圣泽平所被惑。一次,同時它又會不斷前前後移動以研究木及的 在木星北極的夜間發出極光,一如地球上北 · 俄梅希望阻年間V卡特热比的財政預算小瓶, 目前科學家已梨察到木屋是一個令人迷惑的衛星作出完整的描繪,同時又可以刻直出和脂肇 低自太空船航撘家一號,接近木星以來,使,輻射和啟力。楊珮說:「如果一切工作順利, 伊 木星一度会人宕起来似一個相當簡單的星球 依太空船迅速移往另一個衛風,如是者書寫我對
·可以獲得木星大粲肝的肯定性化學資料,對這些| 伽利略號是目前唯一圈開的新太空旅程叶严
取
化。那些光亮的不規訓的片场似乎是蛇年噬的蔭油機,整懵我感 或許是尕石正撞所造成的火山口·所見到的不越酷提示表暨面會發生 类别航海家一聽從五十萁嘎之距離拍攝木塊的照片。這些圓形的特律
太空船拍攝的木星照片