correction

TEST
1STD2A
THÈME MONDE DES OBJETS/MATÉRIAUX MÉTALLIQUES
RÉACTIONS D’OXYDORÉDUCTION
!"#$%$
NOM : .......................... PRÉNOM : ................... CLASSE : ............. DATE : ................................
I. NOMS DES IONS(7PT)
&' ()&*+,$$)+-$./,01)+-$2+-$3/4-$-135&46-$$-1,$)+$6&7)+&1$*3$2+--/1-$
!"#$%&'(#$%$)*+$%$,)-(+$%$./0#$%$*#$%$12)-+$%$32(#$%4#$%56(#$%$!)0+$%&/+$
$
3/4$*8)/,1,+$
&/+$
3/4$*135,+$9::'$
&'(#$$
3/4$&)1034310$
./0#$$
3/4$8;2,/<;2+$
)*+$$
3/4$8;2,/=>4+$
*#$$
3/4-$.+,$9::'$
56(#$
3/4$?+,0&4=&4&6+$
12)-+$$
3/4$?/6&--310$
4#$$
3/4$-1).&6+$
,)-(+$$
3/4$@34*$
32(#$$
:/4$436,&6+$
!)0+$$
3/4$-/2310$
!"#$$
A$
7' (&,03$*+-$3/4-$*36+,$*+1<$B13$-/46$2+-$3/4-$0C6&))3B1+-$
782$"/'9727'9$./0#$782$:'7;<6$=>>?$&'(#$$782$@8A"BB7'9$4#$782$C72:$32(#$782$B8D7'9$!"#$782$E6<$=>>?$
56(#$
D$
*' E1+))+$?,/?,3C6C$/46$+4$*/0014$)+-$3/4-$0C6&))3B1+-$
F+-$:/4-$B1+$./,0+46$)+-$0C6&1<$-/46$6/1-$2+-$*&63/4-$*G+-6$H$23,+$2+-$3/4-$?/-363.-$
D$
II. SAVOIR RECONNAÎTRE UNE OXYDATION ET UNE RÉDUCTION(10 PTS)
&' :423B1+@$-/1-$*8&*14+$2+-$2+03ICB1&63/4-$*8303B1+-$-135&46+-$$
I$-G3)$-G&=36$2G14+$*&?61,+$/1$2G14+$?+,6+$2GC)+*6,/4-$$
I$-G3)$-G&=36$2G14+$/<;2&63/4$/1$2G14+$,C21*63/4$
I$)+$*/1?)+$/<;2&46J,C21*6+1,$*/,,+-?/42&46$
I2 + 2e– → 2I– !
Na → Na+ + e–
2 Cr3+ +7 H2O → Cr2O7
2– + 14H+ +6 e–!
Al → Al3+ + 3e–!
!
:"@A'<6!
@6<A6!
@6<A6!
@6<A6!
1!
<FD':A782!
8GHD"A782!
8GHD"A782!
8GHD"A782!
1!
I2/ I–!
Na+/ Na!
Cr2O7
2–/ Cr3+!
Al3+/ Al3+!
1!
I? &89@/FA6C$/6B$@<8@8B7A782B$:7+D6BB8'B$62$'A7/7B"2A$/6B$98AB$D6$/"$/7BA6$B'7;"2A6$J$
8GHD"2A$+$@<8A82$+$K"K26$+$<FD':A6'<$+$:82L'K'FB$+$:MD6$+$F/6:A<82B$+$"::8<DFB$
.AA62A782$N$&6<A"72B$98AB$@6';62A$OA<6$'A7/7BFB$@/'B76'<B$E87B$"/8<B$P'6$DQ"'A<6B$B82A$D6B$72A<'B$N$
$RS$T2$8GHD"2A$6A$'2$<FD':A6'<$P'7$"@@"<A762262A$U$'2$:8'@/6$8GHD"2A$V$<FD':A6'<$B82A$D7AB$
:82L'K'FB$
$>/B$B82A$/7FB$@"<$'26$D697+FP'"A782$DQ8GHD8<FD':A782$J$8GHD"2A$#$$2$F/6:A<82BSW$<FD':A6'<$
$
(S$,87A$/"$<F":A782$B'7;"2A6$J$$
&'(#="P?$#$XI=B?$W$&'=B?$#$XI(#="P?$
YQ782$&'(#$6BA$'2$8GHD"2AZ$:"<$7/$K"K26$D6'G$F/6:A<82B$"'$:8'<B$D6$/"$A<"2BE8<9"A782S$$
Y6$@/89I$9FA"//7P'6$6BA$'2$<FD':A6'<$:"<$7/$:MD6$D6'G$F/6:A<82B$"'$:8'<B$D6$/"$A<"2BE8<9"A782S$
$
0S$,87A$/"$<F":A782$B'7;"2A6$J$$
($560#="P?$#$&'=B?$W$($56(#="P?$#$&'(#="P?$
YQ782$560#$6BA$'2$8GHD"2AZ$:"<$7/$K"K26$'2$F/6:A<82$"'$:8'<B$D6$/"$A<"2BE8<9"A782S$
$
$
K$
D$
D$
D$

III. SAVOIR SI UNE RÉACTION D’OXYDORÉDUCTION EST ENVISAGEABLE(3 PTS)
L4$2/44+$2&4-$)+$*&2,+$*3I*/46,+$14+$)3-6+$2+$*/1?)+-$4/4$*)&--C-$$
M/*8+,$)+-$,C?/4-+-$+<&*6+-$
L4$4+$?+16$+453-&=+,$2+$,C&*63/4$2G/<;2/$,C21*63/4$B1GH$)&$
*/42363/4$2+$0+66,+$+4$?,C-+4*+$14$/<;2&46$+6$14$,C21*6+1,'$
M+))+$*3$?/1,,&$N6,+$-?/46&4C+$/1$2+5,&$N6,+$?,/5/B1C$-+)/4$)&$
./,*+$2+$)G/<;2&46$+6$21$,C21*6+1,$03-$+4$?,C-+4*+$
O4$03)3+1$&*32+$)P3/4$?+,0&4=&4&6+$?+16$,C&=3,$-1,$)P3/4$3/21,+Q$
)G3/4$?+,0&4=&4&6+$+-6$14$/<;2&46$+6$)G3/4$3/21,+$14$,C21*6+1,$
F+$0C6&)$*135,+$?+16$,C&=3,$&5+*$)P&,=+46$0C6&))3B1+Q$
30?/--37)+$*&,$)+$*135,+$+6$)G&,=+46$-/46$2+-$,C21*6+1,-$
O4$03)3+1$&*32+R$)+$.+,$+-6$&66&B1CQ$
F+-$&*32+-$,+4.+,0+46$6/1-$)G3/4$ST9&B'$*+)13$*3$+-6$14$/<;2&46$B13$?+16$2/4*$U/1+,$*+$,V)+$-1,$)+$
W+,$0C6&))3B1+$B13$)13$+-6$14$$,C21*6+1,$
F+$*135,+$?+16$,C213,+$)+$.+,$
9)+$*135,+$+6$)+$.+,$-/46$2+-$,C21*6+1,-'$
FG3/4$*135,+$?+1$/<;2+,$)+$.+,$0C6&))3B1+$
)G3/4$*135,+$+-6$14$/<;2&46$+6$?+16$2/4*$U/1+,$*+$,V)+$53-$H$53-$21$.+,$0C6&))3B1+$+-6$14$
,C21*6+1,'$
MnO4-(aq)/Mn2+(aq)
H+(aq)/H2(g)
I2(aq)/I-(aq)
Ag+(aq)/Ag(s)
Fe2+(aq)/Fe(s)
Cu2+(aq)/Cu(s)
A$
IV. SAVOIR ÉCRIRE ÉQUATION D’OXYDO-RÉDUCTION À PARTIR DES DEMI-ÉQUATIONS ÉLECTRONIQUES
(5PT)
&' L4$*/4-32>,+$)+-$*/1?)+-$/<;2&46-$,C21*6+1,-$-135&46$W+DT9&B'JW+AT9&B'$+6$(7DT$9&B'$J(7$9-'$
&'$X*,3,+$)+-$2+03ICB1&63/4-$C)+*6,/43B1+-$*/,,+-?/42&46+-$H$*+-$*/1?)+-$
560#
="P?#$6[$
$56(#
="P'$
XI(#
$="P?$#(6[$
$XI$=B?$
$
$
O4$2C213,+$C*,3,+$)+-$CB1&63/4-$2+$2+1<$,C&*63/4-$2G/<;2/I,C21*63/4$+453-&=+&7)+-$&5+*$*+-$2+1<$
*/1?)+-$
(560#
="P?#$XI=B?$
$(56(#
="P'T$XI(# $="P?$
8'$
(56(#
="P'T$XI(# $="P?$
(560#
="P?#$XI=B?$
$
$
$
D$
$
$
$
$
$
$
A$
$
$
V. SAVOIR UTILISER LA CLASSIFICATION ÉLECTROCHIMIQUE ET ÉCRIRE LE BILAN
D’UNE OXYDO RÉDUCTION(15PT)
L4$346,/2136$14+$)&0+$2+$Y34*$2&4-$14$7C*8+,$*/46+4&46$14+$-/)163/4$&B1+1-+$2+$-1).&6+$2+$*135,+$
9M1DT9&B'TZL#DI9&B''$
&' [/44+,$)+-$*/1?)+-$/<;2&46$J,C21*6+1,$03-$+4$U+1$2&4-$*+66+$+<?C,3+4*+$$
&'(#
="P?$V$&'=B?$6A$32(# ="P?$V32$=B?$
7' E1+))+-$-/46$)+-$+-?>*+-$*8303B1+-$03-+-$+4$?,C-+4*+$$
&'(#
="P?$%$&'(# ="P?$%$32$=B?$6A$,)-
(+
="P?$
$
*' X*,3,+$)+-$2+03ICB1&63/4-$2G/<;2/,C21*63/4$*/,,+-?/42&46+-$$
&'(#
="P?$#$(6[$
$&'=B?$
32=B?$ $32(#
="P?$#$(6[$
2' \$)G&32+$2+$)&$*)&--3.3*&63/4$2+-$*/1?)+-$*3I2+--/1-$23,+$-3$14+$,C&*63/4$*8303B1+$+46,+$*+-$2+1<$+-?>*+-$
&1,&I6I+))+$)3+1$-?/46&4C0+46$]$^1-63.3+,$)&$,C?/4-+$
\]"@<MB$/"$:/"BB7E7:"A782$D6B$:8'@/6B$8GHD"2AB$<FD':A6'<B$82$"$97B$62$@<FB62:6$D"2B$/6$97/76'$<F":A78226/$
D$
D$
D$
D$

/]8GHD"2A$/6$@/'B$E8<A$&'(#
="P?$";6:$/6$<FD':A6'<$/6$@/'B$E8<A$32$D6B$D6'G$:8'@/6B$&'(# ="P?$V$&'=B?$6A$32(# ="P?$V32$
=B?$'26$<F":A782$B@82A"2F6$@6'A$";87<$/76'$$/6B$782B$:'7;<6$8GHD62A$/6$C72:$$
+' X*,3,+$)GCB1&63/4$73)&4$2+$)&$,C&*63/4$$
2+-$*+1<$2+03ICB1&63/4$$
&'(#
="P?$#$(6[$
$&'=B?$
32=B?$ $32(#
="P?$#$(6[$
)2$62$DFD'7A$/]FP'"A782$I7/"2$$QQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQQ$$
&'(#
="P?$#$32=B?$
$&'=B?$#$32(#
="P?$
.' M/0?)C6+,$+6$)C=+42+,$)+$-*8C0&$*3I2+--/1-$,+?,C-+46&46$*+$B1+$)G/4$/7-+,5+,&$H$)&$.34$2+$)G+<?C,3+4*+$
_4$2C?V6$2+$*135,+$-G+..+*61+$H$)&$-1,.&*+$2+$)&$)&0+$2+$Y34*$$
F&$*/1)+1,$7)+1+$2+$)&$-/)163/4$-GC*)&3,*36$H$)&$-136+$2+$)&$*/4-/00&63/4$2G3/4$*135,+$$
[+-$3/4-$@34*$&??&,&3--+46$2&4-$)&$-/)163/4$
F&$,C&*63/4$-G346+,,/0?6$$2C-$)/,-$B1+$)GC?&3--+1,$2+$*135,+$+-6$-1..3-&46+$?/1,$+0?N*8+,$)+$*/46&*6+$
+46,+$)+-$@34*$+6$)+-$3/4-$*135,+$+4$-/)163/4$
$
D$
D$
A$
!
Dépôt!de!cuivre!
métallique!
Décoloration!car!
disparition!d’ion!
cuivre!!
Zn2+!;!SO42=!
Lame!de!Zinc!
métallique!
Apparition!
d’ion!Zn2+!(aq)!
Lame!de!Zinc!
rongée!