1990-01-12 — Page 26

郭日橋罩

五期星 日二十月一(〇九九一)年九十七國民華中

26

九成八企業患上肥胖症

獎

金刺激生產

作

用失靈

按會門口排成了鈾,嗷嗷叫你吃。兩年後,一九虽爲一百人,實際安排了二百五十人", 「開釋放的「雨勢」人员。其他肶會附欣守業者,在就業,午時間上人都在隧神會沖打撲克牌i啓菇一家王版定 逆战居民,「五七」幹擾的子女- 城城中学事業生+剂 四小時就可以完成一天的生產任務,重慶一家印到下 兴读官中国不認般,收文科主說吗棠),返城青年+ 佔肚。上海楸械化程歪较高的機電行業,工人只要系动 一九七八年,中國的社會大梁乎高為百分之五站八,爲百分之十四至百分之二十五,蛮说,这還是最保守的

個 就症日後在中國的經濟舞台上讓人愛世了。 辦劳麟服務公司,張闆第三產業。擔糯甜!谁兩條就業 國營企菜覇工的各種獎金和訃件超額工衰的奔放行况 不是,倒也不是,性也不是的笹融戶) 阿博 大真:「只华北京一經濟日報」被饉了大津改革八年 自一九七八年開始,國家允許一部分公民自謀瑷業,從廠長們說,現在調動工人的積極性的成本越來越商 蔥核挑出中國就業史上兩個有意義的突破。一不發獎金,那對小時的許工别指望工人不給你擠了,

同萬

另外,中國也是從一九七八年開始,試招懔縣合同工的 元,一九八六年爲五億九千萬元。 只分菰了三四百萬人,而百分之八十以上的人世是按導. 企業和地方財政合圪卵狠,拆了遠腦補西然,還想危救 *十年來,共招合同工五百四十萬人,平均每笫五十四.不均每年遞增百分之五十三」記這八年來,每年的 这就是說,在那兩年裏,新關的就染染鹅-

其量也工安奖金的增長率遠遠高出利際的甲長幅度,迫使 利代增長率還不到百分之五。 一九七八年露二千萬元。一九八四年為五億三千萬

業大軍的上海,冗最多遠七十萬至一百二十萬,冗員率 九十八的企業存在新势力地避過剩現象。擁有五百萬差

过,占的百分之

一之十四) 「關於中國大陸失業問題的報告

v

我會像對持女兒一根疼 朱婚一條金項鏈, 安克·梅說到台灣後,們先訂婚,何菡原

福建女遠嫁台灣 四十年以來第一位

愛的作畫術。

何時去台,為

天,一艘台灣蕉船电视 辆父親的话弄得有黏不可, 八九年七月底的一衷的握東小伙子,他正要:如果亂 男方手椒不完的,民政十月初,麗娜從系 涛 | 水第一名过双台灣的剥一房皆配了一圈我不作 假登基。您昴在台所建省民政廳申請辦理前打電話來,就是说因 嬀陳麗材,成爲四十年 京女孩被我的兒婗貓?次昌原要帶公證來,才她的家人共生霍州,向那去台灣了,前幾天他 芳齡二十的安海达:「你能不能介绍一個交對何氏父子說:「下 字再抵安海,同發的和欧行召話告訴他:「那 夏二 無親無故,你們要關 百婚登記手織。但四 九月二十六日要結婚。

青麻地面泉何昌原生對他的印象不错:何水玉說:「我沒有 陳蔚娜家人只好同意在夜事了。”

娜製 中生 忠防低車 老 隨拱道相 後仰和我

唉,女兒兵不如你喔!

天范

洋的

成法了退好

順學期已經過大半 練習簿遲遲未到

習期川橋

對家何权 ·四染

簿已

#中在老場付半

来事 好 其機 工業

去初

一幅來到烏昌家,他牛親照」,又過十幾日, 人獎,何离底带門理玩,還合拍了一

·東勢助,對末找到意中, 雖難了。他們一起到度

海川沙一小學怪現象

打華八百九十本,只拿到八十四本 - 12年7 十本-只拿到八十八本,带拼背的田字兼 (我用的出字樓,該被郭八百九十木,現 ,拿到一百六十八本,英氣團打辦四百四 只拿到八十四本,於香被打到凶百三本 [精柄巷小學開學ㄛ远了大半惕期,但學 生用的林習傳却使因供避不上。二年 - 排上海「民晚報報道,上海川沙 高級用的数乎薄訂購四百三十本,只到 设杂到,西至理校的學生手冊都发

校一百拿

百三

去那裔司難神組,負到年本

(千辦實好市悫的: 至善訂本八十二

·该公司获取了劃地區定點供園舉法,按年 嗪的规習傳出好们低,十分緊染,市场上

兩岸訊息

本報分類廣告!歡迎

國民華中

▶類廣告]

酒舖 小字卅四個

天二十元

點:,從知要

各界來高群女,每段

BE) AN (RE-

「科技為生產服務J停留口頭上

心荐 紅位大禁照, 地位出墬來。何水玉滿 汝說完,就在 來。所以,我很想家: 人們一直感魔大陸没人 入參尔我們的婚段,客 [爝來電話說:「很多 。」鳥昌說,當天下午 受親友們衷心的祝福 喜悅,不時流露微笑, 膑,却掩不住內心的 夫綱向親友敬酒,和常 ◎踕邶琊格外谟克随着

石灰、術蒽油

月前,中國大中城市的垃圾已成总社會公害,處理方式能有外 用,前不久,發明人体倍天在黑龍江省灣化商場碄進行了現場操作; 述填坑或批地焚毁。而這道發明,則可使滾動成爲再生資源加以利

方[米可燃氣-成本只有一角、價值逄六角左右, 分之公厅垃圾、三分之一公斤張菁、三分之ㄧ公斤石灰可產出一立 而境:生產單位也可以從中獲取一定的蝶濟效益。接似密天測算,三 一項發明邾城市垃圾等股棄物軻化爲鄀的炒色能源i不笸可以凈化 物提取燃料非常重視 - 他們把這種燃料稱之「第六種科」。谁 且可大可小。供千戶人家做依取緩的懋氢站・費用只盤四十萬元左 現在,世界發達邃家從開發能夢和保護環境長的出發,對從發 據發明者會,道項技術生產工藝簡單,設備製作亦不發雜,

泛用於各各戶的微拔和取暖。 大於切潮和汗,也可代替汽油,柴油用於各式內熱機,無可以黃, 每立方米一萬一千四百大卡的可燃氣體。這種氣體無形、無港、無 味,可與天然氣、煤氣混合使用,也可單獨使用。它可以代替石

可,並於前年十二月向社會發佈公歌,邵因袛種原因至今未被社 :一種用城市成圾生產可燃氣體的技術及藝館,經國家專利而

武七十五歲,為了違項發明,他會付出了二十年的心肌 利的發明人破岳天,是四川成都市誕備安裝公司的退休,

雖經認可未被應用

一項處理竝坂發明

三

+2HNO3

B

(1) What

is

the grey solid

(2) Write an

reaction.

equation of the

pate:

市區肆中,補習導師聘請幼師帶幼師主任鏧

181522 54633858 4413514259 6990100

客天收二十玩刊 誠聘助教大埔兼職小沙田區幼稚聘幼師

均計算其期說什

二區阡

修稚0

際靑交匚里主任優勢力而無 經度妄國疫

+40+2H2C.

1990 中學會考預習專欄 明道出版社

yellow

green

2N0 +02

誠聘

教

師 成薯特兒並津校聘言語治

3.开天保民學校

MILL & DALE PRESS

Chemistry (15)

Chemical Properties of HNO3

heated or exposed to light,

cellulose

HND.

Warm turpentine.

+heat

5. HN).is.readity, decomposed, when

.6. Nitrates

HND is monabasic, so, series of salts, the

forms one.

元

朗

4KNIT

AND

O2+2H20

brown

幼

師

光的牧會幼稚全功 負有意請教限殺歷五為

16堂謝校屁或電

十

1479426257

幼師

葵心鮮區聘請至日期

7263349466998

174205904

|沙田津校文員

,續愉渀記二月上任起

gas.

No dissolves in the acid.and. makes. it yellow in cołaur.

5.2 Dilute No, is a strong, monobasic

aciditexhibits thes ua properties of acids. Howeve

reactions with metals are differre.

from those of other typical fas

much as dil HC, di H250, ot

A Degause (i - HND is an idising

ab

Only very dilute HND behaves as a

normal acid when reacted with Mg and Ca.

6.1 Altrates, excep

ahare. hydrated.

soluble.

6,3 Alltrates are thermally unstable and decomposed on feating. The ease of decomposition increases. down, the Activity Series..

Fates of Products of

heating metal

nitrite 0

「基督教中務文員一名:

Metal oxide

e.g. Mg + 2HNO,

Mg(NO)

作應者,請附发近照寄美林

沙 基醫院或致低。 1016021799查詢

·Fe

5.3 Both dilute and conce

Pb

•HNO act as... strong

agents.fc.f. conc. H2SO4t

門津中

文憑啟角有清糖鬼壓附近商 安屯門安定邨路德會呂祥光 美數或電4503618.

全日護理

翌當全體人員一心爲 土服務遇到細心

者可代申請公換金

796990

559763

課

師

學聘代課學位数

文中二二五九

周二日至四月

語小組

141集11/

行史:38199527

90亊软A/FA

師

英

舞文

工作 售上3686720 | 3程解 文 蔚......會瑟文, 大厨各物

每個別自组:不讓心!

{a}

the nitrate ion (ND, ) in an acid

medium is an electron acceptor.. Conc. HNO3

NO, (aq) +1 (ag) to _———~NO2{g}+H2O{£} (+5]=0-N. decreases.

-(+4)

Dilute or moderately conc. HND:

NO2"{ag}+4H* aq)+3@ —NO(g) +2H2O [ ¢ }

(+5). Gecreases(+2)

N.8. The reduction of NO is in

Fact very complicated. Sometimes N0. N2 and even NH are obtained, depending on the strength of the reducing agents, the temperature, and the concentration of HNo. etc.

HNO, dilute or concentrated, reacts with metals both above, and below hydrogen in the Activity Series. Brown gas of Nú, are seen.

HND

Metal oxide"

(oxidation). +NO, &

HNO

數

化

neutralization

Metal

HNO

3885494139540

老

出讓

Conc.

Netal nitrate.

的

Metal nitrate

求

Hg

Metal

N.T. Thus, an important method of preparing a metal oxides is by. Cheating its nt trates strongly.

pad for nitrates

Conc.

brown gas is liberated when a ated with a little of

copper turnings,

then the solid ise

奥何鵰 蓉 第一五.滴氣何,過我邊

(c) Lead(11) oxide turned from orange-

yellow first to reddish-brown and finally to grey..

aitained?

(d) What property of cas is indicated

in the above experiment?:

(e) Name a suitable drying agent fur

gas W.

(f) It was fad that 36 cm of dry gas Y, su at 25°C and 1. atm. of prosegrevas collected at of th

emmeucted Heasured.

atm of pressure?

(2) What was the mass of lead{

oxide reacted?

(a) Name the gas that re-kindles the glowing splint in experiments I, II And IV.

(b) Write an equation of the reaction

in T

(c) What is the brown gas?

(d) krite the equations: of the reactions in. II, III and IV respectively.

(e) which of the two nitrates, KNO, and.

Pb(Mag), is more stable towards heating? Explain your answer.

(g) (1) 40 reaction: because He does

not reduce ZnO,

(2) Yes, there is a reaction.

Copper(II) oxide turns from black to reddish-brown because copper is formed a

Solution to 0.8.2 (a)誌 acts as a catalyst.. {b} Nitrogen{1})—oxide

apou

+502

and

water

nitrogen(IV)

Questio

The.

(g) Would there be any reaction if lead(II) oxide is replaced, in

Habe

man

below shows the which ammonia is large scale.

turn, by..

(1) Znic(11) oxide,

{2} Copper(11) axide.

If NO, state so.

If there is a reaction, describe briefly your observation and write. an.equation of the reaction.

Question 8.2

In the experiment below oxygen gas is bubbled through some concentrated aquecus ammonia solution above which a hotplatinum spiral is hanged. from a glass red.

Oxygan

(a) What is the

platinium:spira??

Glass rod.

Platinum

Sutral

Concentrated

aquecus onnan tə salut Jon

containing a fou drops of itmus solution

function or the

(-1)) PUBLIC

+24_0(2)+241 (9)

(b) Mix the unknown solution. with freshly-prepared iron(11) sulphate inva.test=tuhe. Add conc. H2SO slowly to the mixture down the side of the test-tube so as to form a Tower layer; If a brown, ring is formed. batween the cont Tayer and the aqueous layer, then the unknown solution consists br

"brown ring" Cenci

LeadCi-oxico

rite anseluggiornnesbf the action.

(c) A brown gas is seen hear around the

platinum spiral. What is it?

Write an equation of its formation. (d). The platinum spiral needs to be heated initially only.. Once the reaction 15 started,

more. heating of the spiral is necessary. Explain why this is so.

no

(e) The 1tmus tuns from blue to red

during the reaction.

Explain

observed.

Question 8.3

the briefly

changes

In the experiment below a substance X was heated strongly in a. Pyrex test- tube and a glowing splint was placed in the position as shown,

monla

unreacted.

cecycled

(a) State ONE possible sour test

nitrogen and name the presadby. which it is obtained from source:

(b) State ONE possible sunce

hydrogen", and name the pro which it is obtaine source,

of

泌

its

Ic) The converter X is packed with a catalyst. Sugg suitable. catalyst of the reaction. (d):Suggest Twolaasulaude methods to

remove again the device Y. (e) Nite gen react with hydrogen gas foom amcionia according to the rersible equation below..

31 (9) = 2013 (9);

AH = 93k2mb).*!

(1).

Is the yield.of ammonia increased by using a high or low temperature?

(ii) Is the yield of ammonia.he increased by using a high or

1ow:pressure?

雄

practic,'、itis.

not too high

desirable to use a

and pressure

a too Tow temperature in the converter. Explain -briefly your answer -in: each case.

Solution to 0.8.1 (a) is ammonia..

X is water.

xis nitrogen.

(b)(ii)SO+Ca(OH)g

CaSIg+2NHg+2FQ0

Glowing spiled

(b)(1) The grey solid is leadi

(2) 2NH3 + 3P603PH + 3450+ N

項佳

清打

【裝西潔臘

SWIRE 8681111 !

818 43384

■ 爛舊酸枝

Omoderately.

concz

N.B. Al or fe are rendered passive

when added to HND, because the mctal oxide layer formed on the surface of the metal prevents... further attack of conc. HNO

(c) with other reducing agents, conc.

HNO 15 reduced mainly to

(brown gas) and 11,0

°C+4HNO

Question 8.1

In the experiment below, a colourless liquid X and a colourless gas Y were obtained on passing, the gas W over some Tead() oxide, at red-hot.

arying agent Heat.

am sulphato

The following observation was recorded.

1. KNG, crystals Palabrown furos, vero, seen.

The glowing splint was tem xindlod.

(d). The reducing property of gasow

indicated.

(e) Calcium oxide-(quicklime).

改

修理收買

高個妆質酸枝花梨理!

打時翻新古器開

1.傳坪邊1168333 47554合

SHNO.

H2PC + 50 + H20

Calcium hydroxide:

(f){1} 2NHg + 3Pb) ← 3PS + N3 + 3H_0

Duservation

2mol.

Imol

!... RNA crystals Solid melted.

4.e. 2vol.

ival.

Tha glowing splint was ras kindled.

361cm2

vol.

reacted. = 361x

Cia

and conci

Dense brown fuses were

seen.

(2) M(Pb0) = 223 mal

2NH+ 3P60

3120

The glowing'.splint was text Ingolshed.

(3x223)g:

24 dm3

copper

turnings:

Solid malted. Brown fuse's

| were seagu

79

(Pb)) reacted

.36 cm3

¥3x2231x24000.

crystals

crystals

(a) Identify and name the substances, W,

and Y..

(b) Write an equation of the formation.

Leane, Hysn

of gas M.

36

(c) The brown gas is

oxide.

·2NO + - 2N02

(d) The : reactioh, occurring tat the spiralis exothermic. The heat 'evolved can manitain the spiral at.

a hign temperature. (e)'Ammonia.solution is alkaline, so.

it turas litmus blue.

During the reaction, ammonia is

·reacted while nitrogen(IV) 'oxide is" formed. Nitrogen(IV) oxide is then?

in water to give an acidic solution: which thus turns

ftmus red.

| Solution 0.8.3

(a)-Cxygen gas.

(b) 2XNO3

-HNO2+ HNO3:

(c) Nitrogen(IV)- nxide. (d) IE: KN)3 + H2SO4

KHSUA HNJ

·411ND 2H20 + 4NOZ

TTE: KNDg + H2504vä KHSRg + HNO3

IV: ZPD(NO3)2

(e) kNOg is more stable because it is

decomposed, on heating, to KNO (potassium 'nitrite) only, rotto its oxide.

Solution to 0.8.4

(a) Air.

is obtained from liquid air by fractional distillation.:

(b) Water/Natural gas/Petroleum

industry

H2 15 obtained from water, "by electrolysis.

(c) Tron powder. (with a small amount of

A120

(d) Hy is either condensed to liquid. ig by cooling on dissolved "sh water to form aqueous NP, solution,

(e){i} Thè yield is increased by.

using a low temperature. Since the forward-reaction is exothermic, so, lowering the temperature will shift the equilibrium tofthe right: thus: giving more Nig.. (1) The yield is increased by

using:ra high pressure.com Since the number of moles of gaseous reactants; 15. greater. than that of products, so, an.. increase pressure will

•shift the -equilibrium to the right, thas yielding more NH-

(ii) It is rather difficult and not economical to build a Converter to withstand tea large a pressure..

The reaction is too slow at too low a pressure, As à consequence, an optimal pressure (~200 atm ) ard temperature (450°-500°C)$s are, employed.