頁二第張六第日八廿月正年四季歷夏 WAH KIU YAT PO
1981:
中學會考試題預習專欄
化學
明德出版社朱宏林提供資料
Chemistry (21)
Reginald W. Chu
MILL & DALE PRESS LTD..
Question 31
(a) In the experiment as
illustrated below, when a stream of dry ammonia was passed slowly over some. heated copper(II)oxide, a gas X was obtained which was then passed over some powdered magnesium at
d-hot.
magnesium.
powder
capper(II).
apixe
filter
diend
beat..
sulphurie.
conc.
acid
(1) Name the gas X. (ii) At the end of the
experiment, a reddish-
brown powder, was obtained in tube A and a yellow solid in tube C. (1) Give the name of these two solida respectively.
(2) Write an equation for the formation of each of these two solidn
(iii) State two functions of the concentrated
sulphuric acid in the tube B
(iv) on treatment with water,
the yellow solid in tube C would give a white solid, W; and a colourless gae, Z, with a pungent awell.
(1) Name the white solid,
W. and the colourless
(2) Give an equation for their formation. (v) How many grams of the
yellow solid could be obtained in tube C from 1.54g of magnesium powder? (vi) If the amount of yellow
solid formed in (v) was boiled with water,..
(1) What mass of white
aolid wa
(2) What volume of gas Z measure at e.t.p would be formed?
(vi) When magnesium is
burned in air and dropa of water are udited to the hot residue, moist indicator paper held- above it shows a p greater than seren. Explain briefly why thin
(b) How would you distinguish between carbon and 10" 40 copper(11)oxide (bath: of: which are black powdera)
·本港一位酒店業人
報日僑
by means of the following testa applied to each of the substances?
Describe wh'nt you would observe in both tests with each substance. If a gas is produced you must describe how you identify it?
(1) Heating in a currant of
nir.
(ii) Action of hot dilute
bydrochloric acid.
Queatian 32
(a) Some information. about.
tive elemente lettered with TV, X, Y and Z (which are not the chemical symbols for the elements) is given below:
Elementi
Atomic Ma ex minbernumberration
Electroniä configu
9
พ
19:
247
-2.7.
器
1.1.
:23:
2.8.1
1:5
31
2.8.5
Z
18
40
2.8.8
(1) Give the letter of the element which beat fits the description below:- (1) the one which is a
atrong reducing agent; (2) the one which can he
described as unreactive) {3} the one which contains 5 neutrons in ita, nucleus
(4) the one which consista of monatomic molecules. (ii) What is the formula of the compound formed. between element Y and element X?
(iii) Element W can combine
separately with element X and element Y to form
the compounds. P‘and Q
respectively
材人業專店酒練訓 務急業遊旅展發爲
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(1) state the type of
chemical bond present in P and Q respectively. (2)Draw diagrams 'to'
show the electronic structures. off and Q respectively. (3) which one of pand
bave a
relatively low melting point? Explain briefly.
(4) Which one of P and Q in liquid state, wil? conduct electricity? Explain briefly. (iv) Both elements X and Y
are solida at room temperature, but X has a relatively higher melting point then Y does. Explain why this in 10. (b) Give an explan
tip each of the following statements:
(1) Elements in the sane group
in the Periodic Table. frequently react in a similar way.
(ii) Water which has been.
abaken with hydrogen: chloride forms precipitate with silver nitrate.
molution while water which has been shaken with P tetrachloro-metkane not react with silver. nitrate at all. (iii) The pll of pure water changes when hydrogen chloride:gas is dissolved in it.
(iv) Ethane and ethene are
does.
both hydrocarbons, but they differ in many of their chemical reactions
Question 33
(a) In the experiment below.
a mixture of copper
[
犘週將於四月十八
讀者黃 康來論
·陶海五柳先生傳云:「好說書
不明白之處也不造拆衣液的解釋。 作護只粗略求其大意,對於 ,不求解。」逾句話解者往往解
活動。
包插座、研討會、 日至二間舉行2節 至廿六日合致育科技 不知了多少旗老人土共對讀出國 教育組又將於四月廿四,馬虎了事,以爲也以陶西,這眞一 與圖書參考資料媵實, 有不明白的地方,當然應頌茹備澈
及幻燈片放映、及融學 「示範宮學、兒、電影 季院及育署說著是有許多人讀術只是意的解釋。後引申爲劃也不認眞,降
十五「不求甚解」條:「原指报锵 祂,一九七九)真 册,商務 只求理解精神,不刻意於一字一句
編者按:八條本第一分
阿除了本義外也可能有其他引申義 知大意,而不求深入理解。」一做
,
而且引申義可能比本菱東爲人所
... 餓」。 ,用後起的意義似乎不宜指摘爲「解 熱知。這是詞棄發展的常見現象。. 簡訊
栝五——二八四八五三......,
·香筋中國語文學會
·全面介紹最新視础教育
「不宋茜解」如上。 實不敌布同,因就儷人所知書: 「中關於「不求甚解」的解釋,見
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舔材的硬件及軟件、體 之解而已。怎樣是翡淼之解呢?桓 而其中必定有許多突些附會的地方。五晚七時半至九時。
七月三日至五月間,日若榕古人三萬貫。」澄就是過甚 ,如此而已。「不求甚解」這句器 三月十四日起羯星期六晚七時半。 了守整附會的毛病,或者白費功夫 國際音標的音學入門: 無四 的解釋,但说要適可而止,以至犯 九日起泌星期一晚七時半至九時。 只是說;讀書同然要親求正確徹底 (三)普通話會話專修:三月
所謂「不太甚解」,只是不求過甚 媒明白,豈有含握了事之理。南酒
五十七號五〇三室本書 二〇三二七號駱克道
總逢星期一、四下午五☆三刻至七 一)初級普通話:三月五日
路
New clatina commence in March 1981 |
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turnings and concentrated
aul pluric acid in a hard
test tube was heated
strongly but carefully. Any Ras liberated was directad into another test-tube containing some liquid Y.
tube. A
heat
Conc sulphuric acid
copper turnings:
liquid
(1) A white solid was obtained
în tube A: What is it? (ii) A gas X was liberated on
heating the mixture. (1) What is the gas XP (2) Give an equation for
its" formation.
(3) If liquid Y is dis
distilled water, would the pH value of the resulting solution be smaller or greater than 77.
(iii) Describe what you would
observe in each of the following cases.
(1) Liquid Y is acidified
potassium dichromate: (2) Liquid Y is hydrogen sulphide solution. (3) Liquid Y is Deutral
barium chloride solution,
(4) Liquid Y is bromine
solution. JARAY Give an equation for the reactionds in (2), (3) and (4) respectively. (iv) It is found that an
aqueous solution of sodium
sulphite gives similar
迄年
合辦。 「育學院及香油地理學會 一個塔期五日的教
「疮價活蚴是由 洪 及地理科敎學研討會。 容包括對良,公開演講 行之香港地雅日,內 本星期四(三月五日)
迄今近一萬人。」 第一項粟祝活動篇:
年關辨,歷年學生合計, 競艇院於一九五一
釋「不求甚解」
香港中国語文学会主持
中國语文信箱
changes as the gas I doin in" (111). Expttin briefly
(v) When the residue in tabe
Avea poured into water in
a benker carefully, with stirring, coloured solution was obtained, was the colour of tha
(日 solution A in obtained by
dissolving 2.0g of sodium hydroxide in water which is then made up to 250cm), What is the molarity of solution':A?
(ii) Solution B is obtained by:
dissolving 2.45g of sulphuric acid in water which is then diluted to 250cm),
what in the molarity.or. solution B2 legal b (iii) 25cm3 of solution A are
slowly added into cạnh th beaker containing 25cm) of solution B until all of the solution A are added
(1) What would happen to
the pH of the solution in the beaker during the addition of solution A into it?
(2) A salt ta usually obtained on mixing.
an acid with a base, What is the name of the salt X thus obtained in the above experimenty (3)-What.in.the molarity:
of the salt X?
(iv) What would be obtained un
mixing 20cm3 of solution A with 10cm of solution B?
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