1989-11-04 — Page 30

·七國民華中

日七初月十年巳己曆夏

報日僑

̇六期星 日四月一十(九八九一年八十七國民華中(30)

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1990:中學會考預習專欄

-明選出版社

MILE & DALE PRESS

Chemistry(5)

Unit 3: Preparation, Physical Properties and Tests of Common Gases

Name

Chlorine

C12

Laboratory Preparation

Physical Properties

1. By oxidation of conc. 1. Greenism-yellow, heving a choking HOT using KMnO4(no heating), unpleasant smell, Extremely Müz, Pb02 or Pb304 (all with neating).

24C1+(0) - H2O+C12'

2. By heating a mixture of

sodium chloride,

Icone. H250a-

Na2S04+2HC1

4HC1+Mn02 NaC12+2H2C+C]2}

nanganese(IV) oxide and

| NaC1+H2SO4

Hydrogen

2

Jabove hydrogen in the

Aitrogen

rray of 10

彎

ontains 20

L

GHE

Cxygen

02

poisonous..

12. Acidic to litmus land bleaching

white).

3. Ayout 21 times denser than air.

4. Fairly soluble in water.

15. Does not burn.

6. Easily Fiquefied under pressure.

By action of a dilute acid, 1. Colourless, odourless, tasteless, (except HNO3) on a meta!

JActivity Series.

3.g. 2n+12504 - ZnSO4+H2

By heating a mixture of sodium nitrite and jammonium chloride solutions,

Pleating NH4NOg alone is explosiva.)

||NaNO2+NitqOL → NH&NOq+N&C!

NHLNO2 N2+2H20

1. By catalytic

fecomposition of hydrogen peroxide, using Mroz as

itne catalyst.

¡2H202 - 2H20+02

2. By Heating potassium

ichiorate with Moog las

the catalyst).

(2KC103 KC1+3C

3. By heating potassium

nitrate or sodium nitrate

|2KV03.— 2KNO2+02

Ammonid By heating armonium

salt with an alkali e.

NH4Cl with Ca(OH)2.

2NH4C1+C6 (CP)2

→ DaC12+H2D+NH3

|ren-poisenous,

2. Neutral to litmus.

13. The lightest gas known.

4. Insoluble in water.

5. Burns with a pale-blue flame in

air to give Hg0.

6. Forms explosive mixture with

lain or oxygen.

Tests

Name

Laboratory preparation

Carbon cioxide

1. By action of a dilute

acid eig. HC), one metal

2

carbonate e.g.limestone,

R. Chu

1. 8y its characteristic

choking smell.

12. By its greänish-

it

yellow colour.

3. By its turning wat blue litmus paper red

and then bleaching it' jwhite.

It gives a "pop" sound

on applying a flame to it.

1. Colourless, odourless, tasteless, It gives negative nen-poisonous.

2. Meutral to liteus.

|3. Slightly canser than air.

4. Slightly soluble in water.

15. Does not purn nor support.

combustion.

1. Colourless, odourless, tasteless, non-poisonous.

2. Neutral to Jitnus.

3. Slightly denser than air,

14. Slightly soluble in water.

15. Supports combustion.

1. Colourless, having a (characteristic pungent choking

smell. Poisonous at high concentration.

2. Alkalne to litmus.

3. Less dense than

4. Very soluble water

|

tests towards litmus:

limewater, and a lighted splint.

It re-kind as a glow ng spint.

Physical properties

Tests

(1. Colourless, odourless, tasteless. By its turning limewater

milky.

2. Weakly acidic to Fitmus.

3. About 1 times heavier than air,

[CaCO3+2HCl - CaCl2+H2C+Cl2:14. Slightly. solubie in water.

2. By heating a metal

hydrogen carbonate, or a metal carbonate except NagCO3. and K2C03.

| 2NaHCO3 - Na2CO3+H2O+CO2

CUC03 → CuO+CO2

5. Does not burn ner support combustion,

16. Easily sodified under pressure.

Carbon 1. Ry reduction of CO2 by mcnoxide |red-hot charocal.

[0 CO2+CCO

2. By dehydrating oxalic lacid, using conc. H2S04.

(002 is removed by JQ. Nao-)

1. Colourless, odourless, tasteless. By its burning quietly Extremely poisonous.

2. Neutral to limes.

3. Slightly less dense than air.

|4. Insoluble in water.

5. Burns with a blue flame in air

to give C02.

ip air with a blue

flame to form 002 which

turns linewater milky.

401

itmus.

Hydrogen By adding conc. H2504 to chlorice

to common. salt.

1. Colourless, having a sharp taste

j and a choking, irritating smell. (Poisonous.

2. Acidic to

|3. Slightly denser than air,

4. Very so?uble in water.

5. Does not burn nor support combustion.

11. By its forming in

mcisted air.

2. By its forming dense

white fumes with NH3.

Vitrogen (By action of moderately monoxice conc. HNO3 on copper

NO turnings

30+BHNO3 - 3Cu(NO3)2+420

+2N0

[(N.B. N20 can give the (same resuit.j

-Nitrogen (1. By action of conc. *NG

eoxice fon copper turnings.

02 [Cu+4:NO3 - Cu(NO3)2+28p0

+2N02

12. By hnatory lead{{f)

:trate crystals.

i1. By its characteristic

pungent smell.

By its turning yet

2Pb(NO3)22PbQ+ANO2+02

1. Colourless, small unknown. 2. Neutrd to litmuse

3. Slightly less dense than air. 4. Insoluble in water.

5. joes not burn nor support combustion.

1. By its turning brown

on contact with air/ (oxyger.

2. By its turning aqueous FeSO4 dark- brown.

1. Reddish-brown, having a pungent, irritating smell, Poisonous.

2. Acidic to litmus.

3. About 1 times censer than arr. 4. Very soluble in water.

15. Does not burn nor support

combustion.

6. Easily 1:quefies at room temperature and one pressure.

By its characteristic reodish-brown colour

jor pungent, choking

smell.

dioxide

retmus paper

502

Qua

CuSO4+2H21)+SO2

s the only compon

13. About 24 times denser than air.

2衛 7n of dil iClo

alkatane gas.

刺By its forming dense

ish-

white fumes with C: gas.

sodium sulphite. Heiply is after required Na 503-2HC1

財團高價收購

5. Burns in oxyssen wathy

yellow flame but got int

6. Readily liquefiedal S1146

財團徵求

by heating conc. HpSÉg 1. Colourless, with a choking small,

Poisoncus.

12. Acidic to lithus.

4. Very soluble ir air.

15. Does not burn nor support

combustion.

1. By its pungent.

|choking, sharp aerid

smell.

2. By its decolourizing

purple acidified [KMnO4(aq).

3. By its turning crarge|

acidified K2Cr207iac) tol green.

財團徵求 財團高價收購 分類廣告

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