1965-01-08 — Page 26

八月二年五六公竿四十国

育教機暴

一九六五年度 中文中學會鴻?

試題預習專欄

化學科(五)

闯校

補遺:在第9

「答葉滿印.

用途兹補. 用途 上用以感火(碳酸乳內與統酸

2.空氣中二氧化碳(碳酸氣)可作

用以製造清涼飲料如洗 啤酒等,及碳酸为和监 之原料

△製成乾冰後可作冷藏劑

過氧化氢之稀溶湘,外觀冥水 相似將如何鑑別

答:用適量含碘化鉀溶液澱

過R

2KOH+12.

可迟制A,木炭粉奖:氧化錳

5:(A)以表盤层分别加入二氧化錳

及木炭粉中,随即加热,若有黄绿 色氣体(CC)發生者,便是二氧化 馬無此反應者:便是木炭粉、甘百

方程式如下

R KOH MYCO

SK.CO3+2Al→2KC+H•OFCO=1

K+CO2+ Call→ CaCO34+2KCE. 試用方程式以表示、銅盤(銅離子) 答:如硫酸铜理水 離子因此銅盤 用銅離子

(a)銅離子的顏色同盐水溶液

里藍色。

如道入硫化氢HIS.即生黑 Uniklus.

(七)若加氨水則生藍绿色的膠

但落於過量的氨水時即成 深藍泡溶液

*+4NH2OH CGCNH)+4H2O

̇銅氧離子(深藍色) 比如將己磨光之鐵或鋅浸於

·銅鹽的水溶液内,則銅附着 於表面

CGute + Fe→ Cut Fe*

Xo Cu 600+ Fe→ Cu+ Fe 504.

5.點有碳酸钠消石灰、氫氧化鉀、凱

水 中其識

如下

種氣體燃燒,继則使 所得 氣体分别通入澄清 石灰水中,如有白色沉殿后生者 便是一氧化碳、累,此 是我 .應方程式如

(2)將各種溶液分别取出少钱 加热,若有刺激特惠满佳者 便是氣水

悲者便

200+02

260.

Ca(OH)2 + Cai Ca Clift HQ.

3.某物價的焰色

溶液則將石蕊试纸赛桠苦加酸

剩起黑色氣泡又苦加氯化鈣

NHACH ANH T

呼氣入其他

白色沉澱後生

冰湯

~

Ca(OH) g + COr Call, V + H = U

·女莅酸分别滴入其餘各種港

是碳酸鈉

氧化鈉紫色者便

(BT经群定乳化永 答:(A)加氯水没“硫化碳於

比鈉溴化纳典碘化鈉之水洗 匯中国各有不同之变化因此 便可鑑別這三種物真

所成立濯体星红色或橙色 看便是深化鈉

2 Nacht Brave - Na Br+ Cz (溶於二硫化碳成红色或橙色

他鈉.

2 Na 1 + Cl2 Nall + I1... (清於硫化碳成紫色) 將此兩種物随分别强热 若能使木條之餘燼爆燃者 後是氧化汞,無此反應指傳

二氧化碳、氫、硫化氫氣阮經

·吞器店

鑑別方法如下.

(四)先以浸濕之红色石蕊試紙試 三、麦鸡藍色、次用玻璃棒蘸濃.

定制

ACC+ NH3-

·NH4Cl.

(b)以醋酸铅溶液所浸濕之纸

硫化氫

Pb (CH2 [00); + H; S→Pbs #2CH, COOH 7851312 -2H20+250元↑

老子上到反應,點火劇學生 微弱火焰而是狗便是氧 2H2+02-220

有台也沉殿發生者,便可断 其確物:氧化碳(碳) Ca (OH) ); + CO2 →→ Za CON + HO

第五次預霜問題

2.驗飲料水中是否含有相機 目的方法及其理由

有白色结晶体A(2)獎氢氧化钠 其热則技生一種鞋令红色石蕊試 纸袋整之黑色氣体,以唤者

並用化學方程式說明上述各反應)

→CO+2HCl 2NaCl+H2O+C03:

題中各反應之化学方程式如下

2K+C05 20–20H+2H

6.以最简单方法製到下列各種物違

凱內溴化钠以碘化钠.

一九六五

試題預習專欄

T of anhydrous carbonate required

106) gm'

化學科

26,5 g.

(五)

。王錦釗 ®

of pure acid' required

·73)

*CILHÝSTRY

Solutions to last week's questions ja

Sult.

1) Sodium chloride.

11) Sodium carbon tet

(iii) Sodium bicarbonaté

Formula NaC1

[Na]GU,

Lv) - Potassium nitrate

v)- vaičium carbonate.

Salt

Blue vitriol

(hydrated copper sulphate)

reen vitriol (hydrated

ferrous sulphate)

iii) white vitrbl

(hydrated zino sulphate)

iv) Washing soda

(hydrated sodium carbonate)

Uses

An essential food; food preservative. Making glass: water softeaing..

Making bread and całe sz making health adile Manufacture of fireworks and gunpowder;; a fertile eer, a "preservative for "meata such as corned beef,

Manufacture of glass and cement and in the produc- tion of lime; a 7 in the reduction of iron are in the blast furnace; preparation of carbon dioxide.

rprmula

Volume of CO. generated

5.6 litres at N.T.P

5.6

22.4

• 18.25 gm.

Formula of washing soda: NaC0.108,0

bounte

106410(1x2+16)

286

IBR

:reyurred (if the anhydrous na

TUan of Carbon Dioxide}

fire-extingulehing - ta extinguish fires by means of the carbon dioxide extinguisher,

1) Carbonated beverages. used to make aerated. Avatars

11) Refrigeration - uned to

make the refrigerant

which is superio to ice!

Colour

Blue

Green

iv) Manufacture wor

White

Na CO. 1080

Cuprio chloride dihydrate CuC1.2010

(c) When carbon dioxide, Co., or carbonic anhydride, is, pasaed into line water, which is an aqueous solution of the alkal #laked lime, the two substances neutralise each other to form an insoluble salt, chalk or calcium carbonate CaCU2,

The chalk particles are so fína): which is a white compound, that they remain in suspension in the solution, thus giving the selation ita milky appearance.

The milky

by pass alonge

Ca{0B)g = (CaCO3

our may be removed

carbon dioxide into the milky solution for perid, when the insoluble chalk will be con- verted into soluble calcium bicarbonate;

CO2 ▼ CaCO, + H20' Ca(CO3)2.

by adding a few drops of a dilute acid, such as hy drochlorio or nitric acid, to the solution. Both the ohloride and the nitrate formed are moluble in water.

CAGO,

2801 CaCO3 + 2HNO3

Question 2

23 x 2+12+16x32(1+35.5)

106 106g

12+16x2

1.73

73gm;

22.47fftre

bicarbonate and sodium

carbonate by deam Solvay Procesa,

#CO2+ MH, OB

dry

of the

286

71.5 20.

Property of the gas on which

this use depends,

It does not support com.. bustion.

It is soluble in water. its solution in water unstable

It is easily solidified to white powder, solid carbon dioxide which does not melt but soblines at ordinary temperatures and pressure leaving no liquid behind.[/ It is an acidic. œide and will neutraljse aqueos solutions of alkalia.

*

Plant food - Innvor absorb. It combines with water under

carbon dioxide from the hair forming atarch and ́---

liberating tree oxygen. Animais are thus able to

the influence of sunlight and chlorophyll, forming starch (photosynthesin)

obtain mygen for respirasi.co2 +580 •

tion.

Questions for aext week.

+60

:(a) State three differences between a chlorine atom and

chlorine ion. PATA

(b) Explain why sulphuric acid, rather than hydrochloric

acid, is used in the electrophysis of water.

(c.) Draw the electronic picturs of a sodium atom (atonio

- dumbar – 11). Explain the chemical propebties of,

iSodium on the basis of its atomic #VALEN

Uzawa Labelled diagram to show now you would collect a few jobs of sulphur dioxide in the laboratory an \Given two reasons why you used your method to aellacé

25 al. of an acid were required to neutralise zu mi of a formal solution of an alkali, What was the normality of the acid? If its equivalent weight was 36.5.- what, was the strength of the-noid, in gTANE" DEY, Litre?

用而生棕色 茶之酸性蒸餾 1单桶加热到 有水蒸氣及、種局诺於冷水彩

它氣体、並用化等方程式說明上述

點有碳酸鈣典硫酸鋇的混合粉 不欲從此中捨棄石炭酸! 酸鋇當用何法行之 11.如何分離下列各混合物

(七)氯化氫其林

心,氯化鉛嘆氣化垂汞

火藥

(2)粉有碳酸鈉、毋硫酸鈉及豆研

酸鈉三種結晶物、應以何種方 法以鑑別之

生種 氣体能使溴潤之紅色石蕊試

装鹽、A之水溶液加入氯化龃.

爸沉澱,此白色沉澱不 盐酸,如此則A是什麼物 凰,并寫出其反應才程式: 戴以最简单方法提别下列各组

14

1结晶A強热時有爆炸聲 出红棕色氣体B試管内有黄 殘渣(廣物溶於水,溶液加稀

生白色沉澱沉殿溶於 热水、冷却後沉澱重新析出原 物加硫酸金铁溶液摇匀後侣 試官壁加入濃硫酸則兩層之潤

棕色環是

(2)白色粉A,不於水,溶於醬醒

·放出甚多金色等单:墨味之氣体 能使澄清石灰水老泥圈、原物加 盐酸後悔色反應,呈磚紅色A是

白色结晶A能溶於水水溶液加硝酸

殘渣溶於水,再加硝酸銀陸液 白色沉殿(

稀硝酸)

物價權吧反應呈紫色

升中指南 英文科教材

今日在距的呼聲後出

時間:

上午十時四十五分至十一時 下午六時十五分至三十分 LESSON 20

DIRECT AND INDIRECT SPEECH (1)..

There are two ways to describe what a person bas said.

a) Direct Speech.

The exact words of the speaker are put in inverted com

́s.g..John said, "I an vary hungry.*

2)Indirect Speech.

The original words of the speaker arestpt given but reported in

a different form.

a.gi John said that he was hungry.

AULES POR CHANGING. A SENTENCE PACK DIRECT SPEECH TO INDIRECT SPEECḤ1.

I)Add the conjunction "that" before the indirect statement.

2)Change, the pronouns and the passessive adjectives to the third person.

Tom said, "I am going to school.

Tom said that he was going to acboo1.)

The pupils said, "To like aur school.

The pupils said that they liked their school.

8)Simple Present Tense is changed to simple Past Tenas.

Mary said, “I am a pupil¡ *

Mary' said that she was a punta.

top maid, "I like fishing."

Tom said that he liked fishing.

Cirrusent Continuous Tense is changed to Past Continuous Zense.

John said, “à typhoon is coming.”

John auta that a typhoon was coming.

The pupils unid, "We are learning English."

The' pupila said that they wara losrning English.

5)Present Perfect Tense is changed to Past Perfect Tense,

1,8, Joan qaid, "I navè posted the latter."

Joan said that she has posted the letter. The little boy said, "I have broken the glass. The little boy said that he had broken the glass

6) The Past Tense is changed to the fast. Perfect sense..

-g. Mrs.Brown said, "I wrote a latter this morning."

Mrs.Brown said that she had written a letter that morning.

Joan niad, bought a new dress.

Joan esid that, she had bought a new dressi

EXERCISE

[Rewrite"EnaTMfollowing sentences in Indirect speech i

policeman, We Have Lose four way) John. bam sorry.a The headmaster said to the man „1 « Come in. (@

{Mary{void co

The Cascher said to the pupil, * You have made a mistakes ariKchen-wdd.

ing" the ¿dinner

TdenteTake,these handkarchda