Đề thi học sinh giỏi lớp 9 môn Hóa

sb ~rAo DVC & DAO T ~ O K* THI HQC SXNH G I ~ I THANH P B ~ - L&' 9 
HA ~ 0 1 N6m hoc 201 2-2013 
M8n thi: H6a HQC 
Nghy thi: 05 - 4 - 2013 
Thivi gian lhm bli: 150 phut 
( . t ! thi gdm 2 trang) 
Clu I ( 3,0 diim) 
I/ C ~ O su a6 phAn img: 
00 
+ (Nj't F H,SO,(loang) (v + NBOH , (2) - Fe(OH13 (GI 
Q) +ta,it"/ 
~ i k t : (X) + H2S04 o o l g ) + (Y) + (G) + H20. vikt ,hum, trlnh hoh hpc minh hpa. 
21 C6 chc chit khi bt>i lh hai nu6c sau: khi C02, khi 02, khi SOz. N ~ U d h g H2SOs d$c hoac CaO cb 
th& l h kh6 duqc nhting khi nho nbi trCn. GiAi thich @i sao? 
Clu I1 ( 4,0 dihm) 
11 Neu hi$n tuqng h6a h ~ c v$ vikt chc phuong trinh hoA h ~ c minh hpa cho cac thi nghigm sau biy : 
a) Nh6 tu tu din du dung djch HF vdo Ang nghiem d p g boi Si02. 
b) ThPm vAi gipt pllenolphtalein vao 6ng nghiem chua dung djch NaOH lohg, sau 66 them ti$ 
lupng du dung djch HCl. 
c) D& tir tir dkn du khi CH3-CH=CH2 vho Brig nghiem ch3a dung djch brom. 
d) Cho tiT tir bin du dung djch HzS04 vAo Ang nghiem chira bat CuO, rbi sau d6 them tikp dung 
djch NaOH du. 
21 X, Y, Z I& Iuqt l i mu& cua ciic kim loqi nnatri, kali, bari thoh m h chc diku kien sau: 
Z + X -. c6 chit khhi A v& c6 chit kkt tha C. 
~ i & t khi A c6 phh img l h rnh rnhu dung djch brom vh k&t tea C khbng tan trong dung djch 
HCI. C h ~ n chc mu& X, Y, pha hqp va viit chc phuong trjnll hob h ~ c minh hog. 
CQu 111 (4,O d l h ) 
I/ D& 5,6 lit h6n hgp khi A (dktc) gbm metan, etilen va axetilen vho dung djch chi chim 40 gam brom, 
sau khi ch p h h img xtiy ra hob t o h thu duqc 500 ml dung dich trong 66 brom c6 nbng de 0,l M. N ~ U 
dem ddt chhy h o h toin 2,8 lit h6n hpp khl A (bktc) trong oxi du &hi thu h p c 4,05 gam nubc. 
a) ~ i & t c9c phrrmg trinh h6a h ~ c dB xfty ra. 
b) Tinh t h b h phhn phkn t r h theo th6 tic11 m8i khi trong h8n hqp A. 
21 Cho 19,6 garn h6n hgp X g8rn canxi vA canxi cacbua thc dwg h&t vdi nubc, thu d u ~ c 8,96 lit h6n 
hpp khi Y (dktc). 
a) Tinh kh6i lupng m6i chit cb trong h6n hlrp X. 
b) Dem t o h b$ luwg h8n hqp khi Y nung nbng v6i x k thc Nj thl xhy ra hai p h h img: 
C2Hz 4- H2 ' t o ) c2H4 (1) C2H2 + 2H2 Ni, to c2H6 (2) . 
Sau p h h h g thu duac hbn h q ~ khiZ g8m CzH6, C2H4, Hz du va C2H2 du, ti kh6i c6a h6n hqp Z 
so vbi hidro b h g 8,s. D& t o h b6 luqng h8n hqp kki Z di chm qua binh dwg dung djch brom du, 
sau khi c6c p h h h g xAy ra h o h t o h thiy cbn 3,36 Iit h8n h9p khi (dktc) t11oAt ra khdi blnh. Tinh 
thhh p h h p h h t r h theo thk tich cfia m8i khi trong h8n hqp 2.