1964-05-22 — Page 23

12

Copper.

The most important compound"or ́copperˇis ̄copper sulphate. It is prepared by heating copper with

oncentrated sulphuric acid. Covent

青教堡寶

FIREAR

WAR KIU YAT PO

期五

日二廿月五年过六九一曆公年三十五國民革

英中會考試題預習專欄「化」(十九)

華僑敎育

[continued from the eighteenth-issue)

3. Lead.

Cu

+

22504

-

+

21120

*

SO

英文中學會考歷史科試題

02

2Cu50 2120

HISTORY

Time allowed ewe houza

WORLD HISTORY,

1783 - 1941.

FTV E questions are to be attemptso. wie question from Pari () must be attempted, The questions you answar from Part I must be selected from at least. TWỞ sroups

You wil be allowed an extra ten minutes to read and study the questions. No writing may be done during this time.

Parc L

GROUP 1 - Esrope. 1789 · 1919

Benindo che importance of the mowing in relation to the Frehen Revolution-

(a)

me tennis Court Qathi

(b)

the Storming of the Bastile:

(*)

the Civil Constitution of the Cleravi

(a)

the Flight to Varannus

What part did nationalism play in the downfall of Napoleon?

£3... Account for Italy's tablure to adminya uniev in 1898 and ner success 10

1850. 65

Describe how steam power was appited to coal mining, textile manufacture sod transport – What were the resulta ?

4

3

6.

How did the following sesk to improve social conditions in the simsteenth century?

Robert Oweni

Lord Shaftesbury:

(b)

(c)

Karl Marx

tai

Alexander II

Lead forms five Toxides or which three ́are ́ám-

portant, namely, lead monoxide..triplumbic_te

troxide and lead dioxide.

fal Lead monoxide, Pho

Common name: lithargezorïmassicot Colour: yellow

Preparation:

By heating lead in air at high temperature,

022PBQ

2Pb

By first dissolving lead in nitric acid, converting the nitrate into carbonate and hydroxide by the addition of sodium car- bonate or sodium hydroxide, and then finally heating the nitrate, carbonate or hydroxide.

РЪСОЗ

= Pb0 +

сог Pb(OH)2

H2O 2Pb(NO3)2

&NO2

РЪО

*

= 2pb0

Action of heat. No chartge. Action of acid.

This is an usual neutrali- sation reaction to produce a salt and water.

Action of an alkali. It dissolves in solu-

tions od alkalis to form plumbites.

Pb0 + 2NaOH =

(Piplumbi

Iplumbic tetroxide, Red Lead, Pb,0%

Colour: Scarlet or red Preparation.

H2O

By heating litharge in air at about 400°c.

5Pb0 +

2280304

'3'

This temperature must be carefully "cog- trolled as red lead decomposes at 470 c.. into litharge.

Action of heat.

On heating, oxygen is evolved and the:mon- oxide remains.

2Pb3%

Action of nitric acid.

* 6pbo

0

This is called a compound oxide and, fore, behaves exactly as a compound made up of two lead monoxides and one dioxide added together. 2Pb04

there-

*

2pb0

HNO

Розоц

2H20

Technically it can ve prepared by either one r the following methods:

(a) By heating dilute sulphuric acid and coupei

in the presence of air. 2H2SO +2Cu

(b) By heating copper with sulphur and then

heating the mass in air.

Cu + $ · Cus

→ Cu50

Cus

+

202

2

[

The anhydrous salt is white in colour, but on adding water blue crystals are formed having the composition of CuSO4.5H2O. This change of colour is made use of in testing for water in a chemical laboratory, Copper sulphate penta- hydrate CuSO4.5H20 on heating loses its water of grystallisation and on further heating to 650°- 700°C, the anhydrous copper sulphate de- composes into copper oxide, oxides of sulphur and oxygen. The blue crystallised salt, is afflorescent when the air is fairly dry. Methods of obtaining copper from copper sulphate; Tal By electrolysis of a solution of the sul-

phate, copper is deposited at the cathode. b) By adding a metal higher up in the Electro-

chemical Series such as magnesium, zino or iron, when copper is displaced and thrown down in the solution.

CuSO + Zn -

2150

+ Cu

[e) On adding caustic soda solution to a solu-

tion of copper sulphate, a pale blue pre- cipitate of copper hydroxide is formed.

CuSO4 When

+

2NaOH

д

*

Cu(OH)2

H20

Na2SO

7

{a}

(b)

(d)

Poland.

✔

HNC

pbo

What were Russia's territorja) ambitions in Europe in the nineteenth century How were these checked between 1820 and 18787

To what extent was Germany responsible for the Viral World War?

Write a short historica account of the following between 1918 and 19391.

Spain; Austrian

-Czechoslovakiai

GROUP 2 The British Empire and Commonwealth

Action of hydrochloric acid,

With concentrated hydrochloric acid. ine gas is evolved,

2pb0

Pb504

(c) Lead dioxide) Pb02

Colouri Chocolate bro Preparation.

With concentrat gives lead diox

sic aci¤ ̈red lead

#

1783 - 1941 and the United States, 1783 1041.

Write a short account of the followings.

tat

the Treaty of Waitangi:

(b)

the British North America Act (1867);

{c}.

The Treaty of Vereeniging?

the Statute of Westminster

Write an account of the Federal Movement in Austra

What difficulties delayas the franting of self-government to India after 19097

How did Britain ecquire her colonies in Malaya and Bordco

What are the historical reasons for me main features of the American Constitution?

When and how did the following become United States territory?

(b)·

Florida::

Hawaii

Account for the victory of the Northern ziasse is the American Civil War What were the consequences of this victory in the years which followed?

write an account at the economic development of the Unitan Sza LED-DEISVERI 1865 and 1914:

GROUP 3 The Far East

17831941

explain the importance or me muowing up reisnon to the outbreak of the” Second Anglo-Chinese Warre

BALTY: DO CA12000;

the opium traday tr

the attitude of the Imperial Government to foreign powerAI:

Pressure for creaty, rovisiona

„the larcha Arrow inciffent.

hat wage the kima of tak Tak PlindE? WHO WHEN SHE TURÀ D'inze jinsüzzessful?,

and account tos me decline of the Tokuzawa'Shogunate during this

Impo

nce of the following in Chinese history?,

4HCL 話

4HCI

2PBC12

+

2H20 2H20

•

C12

C1.

+

8HC1

HNK

on, heatI monax.

Pbo

11

Artion of hydrochloric acia.

2H,0. Pbo,

red and the

It is a vigorous oxidising agent” and oxidises hot

chlorine, hydrochloric acid to

Pb04HC1 PUC1,

21120

action of sulphur dioxide.

→

C12

Lead dioxide combines with sulphur di oxide with incandescence to form lead gulphate,

Pb0

-Pb90,

Action of sulphuric acid.

the solution is filtered and the copper hydroxide is strongly heated. black copper oxide is produced.

Cu(OH)2 Cuo

.

when this black copper oxide is placed in a combustion tube and hydrogen gas

is passed over it, reduction takes place and copper metal is obtained.1

Cu0 ✩

12

H20

Ca

The three methods given above apply also to any soluble salt of copper. Identification of copper compounda.

+

(a) Cupric ions are blue in colour. So copper

salts form blue solutions. (b) Ammonia forma complex ions`with cupric

ions. When ammonia is passed into a sol- ution of copper salt, first the insoluble cupric hydroxide is precipitated, but on passing an excess of ammonia the preci- pitate redissolveuble complex com pound with the formula Cu(NH)4(OH)2

(ع)

瓶

4

This complex compound, 1.0.. the cupra-,

mmonium ion Cu(NH,)4 , is very_deep_blue

in colour,

When hydrogen sulphide is passed through

Nipivate of copper

potution of copper

Cus

So

This is easily disdinguished from other sulphides, by the fact that on boiling with dilute nitric acid it yields a blue solution On placing a piece of bright iron, e.g., the blade of a pocket-knife, into a 801- ution of a copper salt, a brown deposit of copper is quickly formed on the iron. The copper from the copper salt is despine displaced by the iron. (e) Cupric oxide, CuO, is black.

oxide, Cu20, is red..

SINRARIES

With hot concentrated sulphuric acid Lead dioxide evolves oxygen. 2Pb0+ 2H 50 = 2Fь50,

Identification of lead compounds,

(a) When mixed with sodium carbonate and heated on carbon block, lead compounds are reduced to greyish-white globules soft enough to mark paper.

Lead salts are usually identified by the

rmation o of a white precipitate with cold dilute hydrochloric acid. This precipitate bC1) is soluble when hot and insoluble When Cold,

英文中學會考英文作文試卷二試題

ENGLISH COMPOSITION |

Cuprous

On heating with

illute sulphuric acia, the former yields. a blue solution of copper sulphate, and the latter yields the same solution with

■ residue of copper.

Cuo #2504

Cu20

SO

CuSO

Cuso

(f) When copper salts are mixed with sodium

carbonate and heated on charcoal block a red scale is formed.

棍考發:今日本屬「英文』科刊出日期,因作者們有不適,未能執筆,故的升「化學」科 「英女科定明日補登。

英文中學會考英文作文試卷一試題

ENGLISH COMPOSITION I.

iná,, Japregand Russis tried to control Korea between 1870,

Concessione in China What havet China from

om the irst World Warho

Hong Kong between 1841 468 1967

PARTI

All me period 18151 846 the A

of Metternich.

DURDAMFICADOTE:10:Féľanon to thymi

Kontes dostrine

Candidates.mustit

the impor

Time, allowed Two hours;

both Section A and section B. They are reminded ATNESS and CLEAR HANDWRITING

dinor to spend more than 55 minutes on the letter,

SECTION A 130 marka W

hayı

living abroad who left Hong Kong year ago. Ave never written in that time and giving him (or her) ngs that have happened to you and to two other mer

market?

less than 400 words, on ONE ONLY of the following topics,

Fening7. Diepure

whasa Work You

in Hosp honat

huimane:

Time allowed - Two hours-?

Candidates MALEE ANEWAY bath Section A and Section, Bi

They are reminded of

the importance of NEATNESS and CLEAR-HANDWRITING. Candidates are advised not to spend more than 35 minutes on the letter,

SECTION A. 130 markantatu

66) Imagine this is the summer of 1967 and that you are stin

In Hong Kong. Write a letter to une of your old Form have just learned te now living abroad and whom you hav Tell him for her) what you have done and what you are for the future are: Mention's major change which has com

#ince he for she), loft wind

ON B170 markn

Write an essay of not less than 100 words on ONE ONLY of the follow

it you couto, conoše, would you prefer, to live on the Ho Hong Kong side of the barbour?. "Discuba bộth sides for your preference cle

(b) wescribe & Visit to a pince you do not 11ko

do you mas you have learned in school

the Colony

which m