1984-02-26 — Page 23

刊遮音兒育教員三第張六第:日五廿月正年子甲歴夏 WAH KIU YAT PO

1984

中學會考試題預習專欄

化學 (廿三)

明德出版社 朱宏林提供資料

CHEMISTRY (25);

A. white.

precipitate H

was obtained.

Experiment

Observation

I Gas A was passed: The solution

into acidified

permanganate wanlution.

potassium.

TI Gas A was passed into aqueous

deenlourized...

·Solubility

REGINALD W. CHU

MILL & DALE PRESS LTD,

Question 34.

(e)Solution X was made

by dissolving-dry. hydrogen.chloride ir diry methylbenzene.

yhat: would happen on adding a drop of solution Konto a piece of dry blue litmus paper?:

(ii) There is no current

detected when two carbon electrodes

ted to ai

tery.

are placed the solution X.

Why?

iii)What would you.

observe on passing ammonia gas into the solution X? Explain your observation briefly.

(iv) Using the outermost

shell only, draw a diagram to show the electronic structure of the substance formed in (iii).

(b)Two experiments were

carried out by a student on a colourless gas A and the results were

tabulated as below.

(1)

(barium chloride solution.

Basing on the.

observation in I only, name one organic gas and twà inorganic gases respectively that might be gas Xi

what

With reference to

the observation in both Tand JI. Would you expect. gas X to be?

(iii)Write an equation

of the formation, of B în II.

(c)When 2.45 g of a pure

solid is heated,

3

720 cm of a gas Zg"

measured at room:

temperature and

pressure,

道家

collected and 1.49.g

of a solid residue is obtained. what is the relative molecular mass of the gas 7?

Question 35:

(a)The graph below shows. the solubilities of two different sal ts_X and Y (which do not

react) at various

temperature.

報日僑華

日期星

日六十月二年四八九一番公年三十七國民華中

colour

in alkene

Ng(£)+3}\g(6)—2NF−(8) ;

white

hat

crystal:

taling.

- AH=-93kJ mol

ethanoic

(i)

State ONE possible:

acid and::

source of each.gas

conc

colour.

colour-

olution

inflag

alkanoic

San

ester

heat

acid H

-Bodius

added

hydroxide

chloro-

alkane

心

100

(1)

At what, temperature

do X and Y have the

same solubility?

Identify and name the compounds X. A, B. Cond D accordiag to the IUPAC systems.

What is the value of (ii) State the reagent(s)

their common

solubility?

What are the

values

of the solubility of

Y at 70°C and 30°C. respectively?

(iii)When 50 g of a

solution saturated with Y at 70°C is allowed to cool down to 30 C, what would be the mass

of: crystals of Cowtainedy Sof (iv) When 120 g of an unsaturated solution of X containing 45 g solute is cooled from 90°C to 40° what would be the mass of crystals of X deposited: 30 g of a solid

ixture containing equal proportions of X and Y are added: into 50 g of water. Jt the mixture is then heated to 40°C, how:auch: solid would remain undissolved?

(四)

(b) A series of'reactions.

on an alkanol. X (CUg0) is shown in

the block diagram

below.

and conditions. necessary for the following: conversions::

(1)x- A (2) X →B

krite an equation of each of the above conversions. iii)Write an equation

of the reaction converting X to D. when compound Ais heated alone in the presence of a peroxide as the catalyst, a

Compound: Ywith

very. large relative molecular mass is obtained

(1) What reaction has

A undergone? (2) Name the compound Y. (3) Krite an equation

of its formation.

Question 36

(a)Ammonia is prepared ou an industrial scale from the gases nitrogen and hydrogen. by the Haber Process.. The reaction may be represented ag. follows..

used in the above process and describe how the gas is... obtained from its respective source, Would the yield of

ammonia be favoured by using a high or low temperature? (iii)Would the: yield of

ammonia be favoured by using a high or low pressure?

(iv) What mass of ammonia

would be produced when I mol of hydrogen gas is completely reacted?

(v) The gas leaving the

reaction chamber (the converter)

consists of ammonia and the unreacted. nitrogen and:

Hydrogen gases, (1) Suggest a method suitable for: separating ammor i a

other from the gases.

(2) What would happen

to the unreacted

MPtrogen and

hydrogen in the above process? (vi) Suggest a suitable

catalyst for the above reaction, (vii)Ammonium sulphate

and sodium nitrate

are two COMELON nitrogeneous fertilizers. If. they cost the same per kilograms which is the cheaper

source of nitrogen?

(b)The following block

diagram summarizes series of chemical

reactions.

colourlese Inolution

E

chlorine gas added

brnmine

(1) Identify and give

the names of A, B, Ċ and p respectively. (ii) what reagent(s)

would you use in

converting A to B? Write an equation

of the reaction, (iii)What other

compound(s) would be formed when chlorine reacts with solution Write an ionic equation of the reaction.

(iv) What is the colour

of the flame when

(v)

gas D burns?.

A moderately concentrated solution. E is electrolysed with carbon electrodes. Name the substance. formed at the anodes

cathode

tively. Write

the ionic equations of the reactions. at the anode snt cathode respectively (vi) Using the outermost

shells only, draw a diagram to; ghow'the- electronic structure of a bromine, molecule. (vii)Which of the two

elements, chlorine and bromine, has a stranger oxidizing

power?

週

兜

童

;最後,由阿力拖

奇妙的澳洲旅程

袋鼠媽媽的袋子替牠去找小袋鼠。何

牠牠穿

很的了

牠的小袋鼠失落 瑪和袋鼠一組,分頭 德仔一組,阿力、伊 牠很傷心。麥教授和

穿了一個闷,因此把

怕得發抖。 上船去。但袋鼠媽媽 來了一隻小艇,準備

力他們負責沿河找尋 。他們來到河邊,我

一上艇上去。 的名字,怎也不貴踏果便是如此!阿力重 腦」—麥教授替他起舊了,不管如何,結 船吧——伊邪說。但也許是「沒頭腦」太 是全無用處,「沒頭上重了,也許是小艇太

葵小郭錢...

特主

友朋到交可才樣怎

借來的甜甜置:

注升

·三國演義精選(三〇三)

避禍

忙望向阿力的手臂,

這才舒了口氣說: 「你把我骈壞了

麼東西,都要觀察日期:一九八四年二月廿六日(星期日)

上

年九

j,你的手臂還在原來

他連樹枝的生長情況|識、故事、一塊兒學講的普通話:

節目內容有:日常生活談話,小常

也要研究一番。他爬

然後鄭重的宣佈說: 到樹上,拿出一把尺一不憂愁,不煩惱,快快樂樂過日子。

生長速度較樹幹快。

「我告訴你,樹枝的」走走走走走,我們小手拉小手,

走走走走走,一同去郊遊。

「麥敎授 - 我們

歌曲郊 遊

「想是掉進海裡」

得跳起來。.. 大叫,這可把伊瑪嚇「了。」伊瑪說。

但阿力想起美味可

「我們的食物!|口的曲奇餅,還有朱 咕力糖,心裡就痛。

:「姜維多計謀,可

大門大開,心下疑惑

釋爲先鋒铿生挑隔

·定是座空城,可一心知中計,她忙想退省悟於是立即佈防 手下諸將却說,那肯 時拽起吊橋。夏侯霸」想到這裡,他猛然一個洞的,他連小袋鼠 一幹砲响,突然角 奔鄉,旌旗過豎,同定是分兵去龔郁山。」戳」的袋子是穿了一 ,不敢進域,但他手 並無一桿旌旗,而且兵當先殺人。忽聽得兵;反面連日來挑戰,是逛次她犯了一個 將近挑陽,望見城上是座空城!」於是領們大殺一番,全不退一路逗他開心呢!可 西北奔走。夏侯霸不一組合兵士唇駡。姜艾袋子裡,這樣她便可 却設姜維斯民| 馬望商議。可馬望說方面,只留偏將師擁·城南視察。只見好多二天,姜維又來挑戰,伊秀說完,便把一 袋 十萬,逕向逖陽殺來」 自己去侯河埋伏,截,欒城逃走了。夏侯 人惡戰一天,不分勝腦]替我拿吧,反正

·鄧艾接報,忙與司 擋蜀軍後援,而祁山霸未敢盡信,縱馬到負便各自回營。第一牠的袋子是空的。」 ・話說美姚起兵 | '殺進城蜀兵。而鄧艾| 能盈慕到大將軍兵到| 引兵與鄧艾交戰。二對了,讓我叫「明 覺大喜,說:「果然尋思道:「蜀兵被我以專心的照織阿力, 百姓,扶老攜幼,往,與女按兵不動。食物放進袋鼠媽媽的

他兵分二路去救跳陽

祁山」但鄧艾却不 維是實取祧陽。於是 以爲然,認爲今向姜

能是處取洗陽而實取

殼 - 大門四開- 在祧离城裡,偃旗息| 。命司馬笔帶兵伏

是去找小袋鼠的...... 白雲悠悠,陽光柔和,

弘德仔說。

∫ 别急,我當然|青山綠水一片錦綉。

·知道是去找小袋鼠。 走走走走走,我們小手拉小手,

但我們對任何事情都

要有興趣,看,蛇!」 走走走走走,一同去郊遊。

·教授說完,勿的腿

那邊有一條蛇!」來

下樹來。 【未完】

人吃草

吃草的。

不必奇怪,人也

!稞麥等..

有百多英尺長,而

:、玉米、小麥、燕麥,

。草本植物,包括竹

超過四千五百種之多 分類,可知道的, ?不止!照科學家的

最高的草是竹,

·伍?一百種?一千種

多少種?十種?14

種類很多,但到底有 我們都知道草的

皮,用作高爾夫球 草。有的被用作草 來源和牲畜的營积 有許多是重要的食物

矮的只有一兩吋高。

和美化庭園之用。其

·草的種類繁多,其中

·也丟失了,伊瑪放進.

中皆藍也是屬於草本

案,退了廿餘里,才 姜維奮勇死戰,棄了 下夾攻:蜀兵大墩。 望却從被中殺出,南 引兵殺入到案。司馬 . 是時,鄧艾親自 死,悲傷不已::: 馬望。但即夏侯霸戰 途中遇姜穎,殺退司 殺出,殺死了蜀兵。 城下可可馬望從城西動向,也就引兵三千的走著,牠雖然叫 城的五百蜀兵,死一。晏維深知了鄧艾的力的後而,一一 - 可憐夏侯霸和已進一己連夜引兵去救祁山·存?牠跟在伊璐和阿 : 却時,斌上箭石如叫兒子鄧忠留守,自一去的食物,又怎能保 一番苦戰了:: ,兩將相遇,艾將有 ,去助張翼,進下子,沒頭腦」,可是牠想 記掛著牠的小袋鼠呢

·...「今番爺艾大数

前,誰敢說退兵者 「!」大將張莢獻計說

慮。我們仍要勇往直 -是兵家常事,不必憂

兩陣,軍心搖動 維對話將說:「勝敗

重新立案。蜀軍迷禨的

付

遥控棒球

看麥教授那邊的情形 現在,讓我們在

原料

植物亅是製糖的主要.

A也吃張呢!

不單是半馬吃草人 都是草的種籽。所以 我們吃的很多食糍,

·越矮矮的野草。因爲

草的時悷,不要單想

·,以後當我們捉到

,怎樣才可以交到朋友?.. 友,可是我得道是一件很難的事,我想請問你

·你在給我們的信中常常鼓勵我們要多結交朋

望回報

好!

【助人爲快樂之本,對人做了好事,不要期

◎不做損人利己的事,處處爲他人着想

解決關於交友困難的事, 己的養也很有幫助,甜甜友,希望可以幫助你 。這樣不獨我們是一個受人歡迎的人,而且對白 *當然敊好! 還未做到的。可以朝這個方向努力 細心檢查一下自己能到了多少,已經做到的 上面我只列出了非常故人的原则,我們不妨

總括一句,要想得友誼,必先從自己做起

FM96及 105

M.

港 96

香港電台第五台

天第

地五

兒童天地」