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Hướng Dẫn Chấm Chọn HSG Hóa 12 (10-11)

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SỞ GIÁO DỤC VÀ ĐÀO TẠO
ĐỒNG THÁP

KỲ THI CHỌN HỌC SINH GIỎI LỚP 12 THPT CẤP TỈNH
NĂM HỌC 2010 - 2011

HƯỚNG DẪN CHẤM ĐỀ THI CHÍNH THỨC MÔN: HOÁ HỌC
(Hướng dẫn chấm và biểu điểm gồm có 07 trang)
Câu 1:(2,0 điểm)
1. !"#$%&''
()*+ !",--. /01''()*2
a. !(32
b. 456789!'':!$" !"#$%:,--2
c. ;$"9< =>*4
&
?

2
2. ;* $@%8"!,6'#!$@''A
B'
8
C

D
3
NO

D
H
+


→

3
Fe
+
D
2
4
SO

D?D4
&
?
Đáp án câu 1
ĐÁP ÁN ĐIỂM
1. a. AE6
&
&6
&
&
1
6
&

8
F.&'()* !"#$%/'01' !",--=8
G/

HICJ 0,25
b. 

0,25 x 3
(0,75)
c. 4
&
IC4
&
4
&
CJ: K,LIMNJ; ?

IC?

JAO"!(P2 0,25 x 2
(0,5)
2.
&
+3 +6
x y
+5
Fe S x Fe + y S + (3x + 6y)e .1
N + 3e N .(x + 2y)
+
→
→
B'
8
C

DI8D&J
3

NO

D/8
H
+

8
3
Fe
+
D
&
4
SO

DI8D&J?D&84
&
?
0,5
Câu 2: (2,0 điểm)
1. !(3!QR;:%6A
RD4
&
C?
/
I(0J
0
t
→
S-QD22222222 IEJ

TD4
&
C?
/
I(0J
0
t
→
S-RD22222222 I&J
QDR
→
;I7JD2222 IJ
2. 4U VV1/,-QIEJ:<<3VV/?4(E-<
<32
a.O-,""<<32
 b.O-4<<32
R"9A4@6*"8"
1
-1,76
a
K 10=
:
W&E
EV
2
a
K

=
Đáp án câu 2

ĐÁP ÁN ĐIỂM
1. 2RD&4
&
C?
/
I(0J
0
t
→
C?
&

DR
&
D
&
C?
/
D&4
&
?IEJ
IQJ
XTDY4
&
C?
/
I(0J
0
t
→

4
&
C

D/T
&
D/
&
C?
/
D/4
&
?I&J
IRJ
0,25 x 3
6
&

/
6
&


<
E
6
E


<

&
<
V
ĐÁP ÁN ĐIỂM
C?
&
D&4
&
C
→
C

D&4
&
?IJ
I;J
(0,75)
2.a.
VV1/
1/
2
SO
n 0,001mol= =
Z
VV/
/V
NaOH
n 0,001mol= =

["4C?


 
C?
&
D?4

4C?


3
NaH¸SO
m 0,001.104 = 0,104gam⇒ =
0,25
2. b \4C?

]G\4C?


]GEV

^
4C?

→
D
D
3
HSO

4

&
C?


ˆ ˆ†
‡ ˆˆ
4
D
D

3
HSO



IEJ
1
-1,76
a
K 10=


3
HSO


ˆ ˆ†
‡ ˆˆ
4
D

D
2
3
SO

 I&J
W&E
EV
2
a
K

=
4
&
?
ˆ ˆ†
‡ ˆˆ
4
D
D
OH

IJ
14
W
K 10

=
O_IEJ:IJ2


3
HSO

D4
&
?
ˆ ˆ†
‡ ˆˆ
4
&
C?

D
OH



E&&/
2
b
K 10

=

2
b
K
``
2

a
K


a<3-8"2
baA
2
a
K
cc
2
b
K
:
W
K
I&J"99A

3
HSO


ˆ ˆ†
‡ ˆˆ
4
D
D
2
3
SO


 I&J
R(

10

\]

10 x


88
W&E

EV
EV
2
2
a
x
K
x


⇒ = =


6
x = 7,82.10



pH 5,1⇒ ≈
b40<A
W
K
``
2
2
a
K C
[;`
1
a
K
A\4
D
]G
E
a a a
2 1 2
a
a
1
1
. . .
+
+
K C K K C
K C
1 K C


=
G

EV
W1E
EV

EV2
&EW
EV2
W1E
EV

+

−−−
GW1/2EV
1

4

YE
1,0
Câu 3:(2,0 điểm)
1. ;d<e''"245*$"f!<<3(g"$"f6A;4C?
/

;;
&

Q;

B';


&
;?

2IN"9%8%< "J
2. [)<<38"4Qh()^;@6*"8"S

:()("f"
α
2ij
$".-S

'&k6
α
:;2IRlm6g("f"nJ
Đáp án câu 3
ĐÁP ÁN ĐIỂM
1. ;''":o"p2[ph<<3
&
;?


!p+ ",q2
2
3
CO


D4
&
?
ˆ ˆ†
‡ ˆˆ

3
HCO

D
OH

ae
&
;?

(.:!p+ "2
[p6"$>,-,q4C?
/
2
3
CO

D&4
D
→4
&
?D;?
&

r
[p ,97,':6"$>,-,qQ;

&Q
D
D
2
3
CO

D4
&
?→&QI?4J

sD;?
&
r
[p ,9(l*:6"$>,-,qB';

&B'
D
D
2
3
CO

D4
&
?→&B'I?4J


sD;?
&
r
[p ,97;;
&
;
&D
D
2
3
CO

→;;?

s
[p,q "f;2
1,0
2.
ĐÁP ÁN ĐIỂM

& &
I J
+
a
HA H + A
Bñ C
C C
[ ] C - C C C K
C - C 1 -
α α

α α α
α α

⇒ = =
ƒ
1,0
Câu 4:(2,0 điểm)
1. ;%AQDR

;Da
t"-"f:n"Mh(),!:(M,9m%6(*I"f
(),q(_"JA
O-"f
h()I^J
O()I^LJ
A B
E V& V&
/
16,0.10

& VE VE
/
2,0.10

 V& VE
/
4,0.10

O-@6(),%::"9$".()%2;$"9$j%u
2.;6#(h6A

++ +
+ + +
6
2 2
1 2 3 4 5 7
ACl H O
NaOH NaOH NaOH
A A A A A A A
→ → → → → →
R"9AQ(("P9$@!om0"!:E&VV
V
;
+("f2
Q
W
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!(3!QQ
E
Q
&
Q

Q
/
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Y
Q
1
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W

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Đáp án câu 4
ĐÁP ÁN ĐIỂM
1. R".()< A

R
8
Q
;;,N
××=


N
E
G,IV&J
8
2IV&J

G
/
16,0.10


N
&
G,IVEJ
8
2IVEJ

G

/
2,0.10

N

G,IV&J
8
2IVEJ

G
/
4,0.10



&
JI
&
&
N
E
N
=
+
=
yx

I8DJG
E
&&

&
N

N
==
x



8GEZG&


N
&
G,IVEJ
E
2IVEJ
&
G
/
2,0.10



,GV&
NGV&2
E
Q
;
2

&
R
;
I%$jG8DGED&GJ
0,5
0,25
0,25
2.
A: w A
1
: w;
Y
A
2
: 4

w?
/
A
3
: 4
&
w?
/
A
4
: 
&
4w?
/

A
5
: 

w?
/
A
6
: Q?

A
7
: Q

w?
/

0,125 x 8
(1,0)
Câu 5A(2,0 điểm)
1. a<"
x
y
z

z
"A
2
Ca
+


Na
+


4;?

:
{

;

(
z
6q
z

|
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;

(q"
6"
Na
+
2;)<<"
x
y
|


z
:#
z
"<<"
x
?4I<J(#
x
/
,
z

|
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x
y
{

x
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|
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z
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z
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x
;I?4J
&
I<J(#
x

Y,
z

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|
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x
,
z
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z
(6q"(
z

x
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x
y}
{
(#
x
*
z

z
,2!(3"!3
2
2. ;~EXoh;:B'

?

/
!<U:n"<<34?

5(:
,(P2C,"!%8%(YV/-,-?I6%k,<
(,J<<3•:+ "1," "2;q <<3•(",2!
(3"!32
Đáp án câu 5
ĐÁP ÁN ĐIỂM
1. a,9vI&Jn#vIEJ26
3
HCO

G
2
3
CO

n#
2
Ca
+
wvIEJA
3
HCO

D
OH

€

2
3
CO

D4
&
?
2
Ca
+

D
2
3
CO


€;;?



IEJ
/
VV/
EVV
2+
3
CaCO
Ca
n n mol= = =

wvI&JA
3
HCO

D
OH

€
2
3
CO

D4
&
?
2
Ca
+

D
2
3
CO


€;;?



I&J

Y
VVY
EVV
3
3
CaCO
HCO
n n mol

= = =
OAC!"<<3yA
A
A
A
A
2
3
Ca 0,04. 2 = 0,08 mol
HCO 0,05. 2 = 0,1 mol
Cl 0,12 mol
Na 0,06 mol
+


+








F'<<3y(6q"(9 A
I
3
2HCO dd)

0
t
→

2
3
CO

D;?
&

D4
&
?


+ 2+
2 2
3
CO H O
Na Ca HCO Cl
m = m m m m m m
− −

+ + + − −
VE
&
m = 0,06(23)+ 0,08(40)+ 0,1(61) + 0,12(35,5) (44 + 18) = 11,84g−
1,0
2. S" "+<;:"67(6•"67ITTJI;,B'
D
J
B'

?
/
D&X4?

€~B'I?

J

D?DE/4
&
?
8 8

x

;DX4?

€;I?

J

&
D&?D/4
&
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&

y

;D&B'I?

J

€;I?

J
&
D&B'I?

J
&

&
x
8

&
x
8
S"%A~EX‚1GXX&

&&8D1/ID

&
x
JGXX&IEJ
NO
n
G
&&YV
/&&
V/Y
=



x
D
&

y
GV&&YI&J
OƒIEJ:I&J

8GV&&YGV&&Y
["(h;I?

J
&
:B'I?


J
&
,"A

0,225.3
m = (0,225 + )188 + 3.0,225.180 = 227,25g
2
1,0
Câu 6A(2,0 điểm)
1. N"9q :>"!(h* ;
/
4
~
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Đáp án câu 6
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Đáp án câu 7
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Câu 8A(2,0 điểm)
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Đáp án câu 8
ĐÁP ÁN ĐIỂM
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