7/29/2019 thi chn HSG - 25-10-2012

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S GIO DC V O TO THI TH CHN HC SINH GII CP TNHTRNG THPT NAM SCH II LP 12 THPT NM HC 2012-1013

Mn thi: HA HCWebsite: http://hoahoc.org Thi gian: 180 pht(khng k thi gian giao )

Ngy thi: 25/10/2012

Cu 1: (2 im)

1.Vit cng thc cu to, gi tn cc hp cht hu c mch h c cng thc phn t C2H5O2N. Vitphng trnh phn ng c trng ca cc cht ng vi mi cng thc cu to tm c.2. Khi thu phn hon 1mol pentapeptit thu c 3mol glyxin,1mol alanin v 1mol phenylalanin.Khi thu phn khng hon ton th trong hn hp sn phm thy c cc dipeptit Ala-Gly, Gly-Alam khng thy c Phe-Gly. Xc nh cng thc cu to ca pentapeptitCu 2: (2 im)1. Sp xp (c gii thch) theo trnh t tng dn tnh axit ca cc cht sau:

(D)(A) (B) (C)

;

N

COOH

;

COOH

;

CH2COOH

N COOH

2. Sp xp (c gii thch) theo trnh t tng dn tnh baz ca cc cht sau:

-NH-CH3 , -CH2-NH2 , C6H5-CH2-NH2,p-O2N-C6H4-NH2.

Cu 3: (2 im)1. Ba hp cht mch h A, B, C c cng thc phn t tng ng l C3H6O, C3H4O, C3H4O2 c cctnh cht sau:

- A, B khng tc dng vi natri, khi tc dng vi hidro u to ra sn phm nh nhau.- B phn ng vi hidro to A

. - A c ng phn A

, khi b oxi ha th A

to cht B.- C c ng phn C, l hp cht n chc nh C.- Khi oxi ha B th thu c C.

Hy xc nh cng thc cu to ca A, A, B, C, C.2. Bng phng php ha hc hy phn bit cc dung dch sau ng trong cc bnh mt nhn: axitglutamic, lizin, glyxin, trimetyl amin, axit fomic.Cu 4: (1 im) Trong phng th nghim c cc dung dch b mt nhn: AlCl3, NaCl, KOH,Mg(NO3)2, Pb(NO3)2, Zn(NO3)2, AgNO3.Ch dng mt thuc th, hy nhn bit mi dung dch.Vit cc phng trnh phn ng (nu c).Cu 5: (1,5 im)

Mt hn hp rn A gm kim loi M v mt oxit ca kim loi , c chia thnh 3 phnbng nhau, mi phn c khi lng l 59,08 gam A. Phn th nht ho tan vo dung dch HCl thuc 4,48 lt kh hiro;phn th hai ho tan vo dung dch hn hpNaNO3 v H2SO4 thu c 4,48lt kh NO; phn th ba em nung nng ri cho tc dng vi kh hiro d cho n khi c mt chtrn duy nht, ho tan ht cht rn bng nc cng toan th c 17,92 lt kh NO thot ra. Cc thtch kh o iu kin tiu chun. Hy tnh khi lng mol nguyn t, cho bit tn ca kim loi Mv cng thc oxit trong hn hp A.Cu 6: (1,5 im) Mt hp cht c to thnh t ion M+ v X 22

. Trong phn t M2X2 c tng sht c bn bng 116, trong s ht mang in nhiu hn s ht khng mang in l 36. S khica M ln hn s khi ca X l 7 n v. Tng s ht trong X 22

nhiu hn ca M+ l 17 ht.

a) Xc nh cc nguyn t M, X v cng thc ca M2X2 . Vit cu hnh electron ca ion M+.Vit cng thc electron ca X 22

.b) Cho hp cht M2X2 tc dng vi H2O. Vit phng trnh phn ng xy ra v trnh by

phng php ha hc nhn bit sn phm.