8/8/2019 Serie 1des Exercices de Chimie Trasformation Lente Et Rapide

1/2

Allal mahdade http://sciencephysique.ifrance.com Page 1

2007 2008

1

.

(((( ))))

l

l l

2 3 2 2

2 7 aq aq 2 8 aq 4 aq

2 2

4 6 aq 2 3 aq 2 2 ( aq ) 2 ( )

2aq aq 2 2 2 4 ( aq ) aq

3

aq s

Cr O / Cr (milieu acide) S O / SO

S O / S O H O / H O

C / C CO / H C H

Fe / Fe

+ + + +

++++ 2-

4 ( aq ) 2 ( aq ) SO / SO

2

(s)

Al 2 ( )

Br

3

( a q ) A

++++

l( aq ) Br

.

1 / 2 .3 2ml .

.M(Al)=27g/molM(Br)=80g/mol d=3,1 3

:

)1: ( 25C2 2 iH O 0 ,05 mol / ==== l2 iI 0 ,05 mol / ==== l2: 25C

2 2 iH O 0 ,10mol / ==== l2 iI 0 ,10mol / ==== l

)3: ( 50C2 2 i

H O 0 ,10mol / ==== l2 iI 0 ,10mol / ==== l

I2

1

2 2 ( aq ) 2 ( ) H O / H O

2 ( aq ) ( aq ) I / I

2 . . 4 H2O2(l)

.dismutation

2 2 ( aq ) 2 ( )

H O / H O 2 ( g ) 2 2 ( aq )

O / H O

1 . 2 3

5*

8/8/2019 Serie 1des Exercices de Chimie Trasformation Lente Et Rapide

2/2

Allal mahdade http://sciencephysique.ifrance.com Page 2

IISnO2(s) .1 m=0,44g

II S (Pb(s .II

1 1 1 2

. ) (2 II .

.S

)(((( ))))2 S aq ) 2 7 ( aq ) 2K Cr O + + + +

++++

C 0 ,020 mol / ==== l. II

2 1 S

2 2 2 32 7 aq aq

Cr O / Cr + + + +.

2 3 S .

3 VE=21,7cm3 .

3 1 :(((( ))))2i

E

n SiC .V

3

++++

====

(((( ))))2in Si++++ II.

3 2 II .M(Sn)=118,7g/mol6*

H2C2O4(aq) MnO4(aq). t=0

0V 25 m ==== l 2

0C 1,0.10 mol / ==== l

r

V 20m ==== l 1r

C 1 ,0.10 mol / ==== lV 5 ,0 m ==== l

.1

. 2 .3 .

4 . 5 . . 6 .

.