THI HA VO C HC SINH GII TNH AN GIANG NGAY 1Trng hc Lp hc Nm hc Mn thi Thi gian Thang im Hc sinh gii tnh An Giang 12 2006 Ha hc 180 pht 10

Cu 1: (5). 1. Hp cht A c to thnh t cation X+ v anion Y-. Phn t A cha 9 nguyn t thuc, gm 3 nguyn t phi kim, t l s nguyn t ca mi nguyn t l 2:3:4. Tng s prton trong A l 42 v trong anion Y- cha hai nguyn t cng chu k v thuc 2 phn nhm chnh lin tip . a/ Vit cng thc phn t v gi tn A b/ Vit cng thc electron v cng thc cu to ca A 2. Mt dung dch c cha ion Ca2+ v Ba2+ cng nng 0.01 M. Thm axit c pH = 4.0. pH ny nu ta thm dung dch K2Cr04 vi nng l 0.1 M c kt ta xut hin khng ? Kt lun cho pT CaCr04 = 0.2; pT BaCrO4 = 9.9 H2CrO4 c pK1 = 1.0 v pK2 = 6.5 Cu 2: (5) 1. Tnh pH v in li ca dung dch NaCN 0.1 M (dd A) cho pKa HCN = 9.35 2. n li thay i th no khi : a. C mt NaOH 0.005M b. C mt HCl 0.002 M c. C mt NaHS04 0.01 M bit pk HS04- = 2 Cu 3: (5) 1. Mt dung dch c cha 4 ion ca 2 mui v c trong c ion S042- khi tc dng v vi dd BA(OH)2 un nng cho kh X, kt ta Y v dung dch Z. dd Z sau khi axit ha tan bng HNO3 to vi AgNO3 kt ta trng ha en ngoi nh sng. Kt ta Y em nung c a g cht rn T. Ga tr ca A thay i ty theo lng Ba(OH)2 em dng: nu va ,a cc i, nu ly d a gim n cc tiu. Khi ly cht rn T vi gi tr cc i a=7.204 gam thy T ch phn ng ht vi 60 ml dd HCl 1.2 M, cn li 5.98 gam cht rn. Hy lp lun xc nh cc ion c trong dung dch. 2. Trnh by phng php phn bit 3 dung dch sau b mt nhn: dung dch NaHS04 0.1 M (dd A), dung dch H2S04 0.1 M (dd B) v dung dich hn hp H2S04 0.1 M v HCl 0.1 M (dd C). Ch c dng qu tm v dung dch NaOH 0.1 M. Tnh s mol cc cht trong cc dung dch. Cu 4: (5) Mt hn hp gm km v st. Thc hin 2 th nghim sau : TN1: Ly 3.07 gam hn hp cho vo 200 ml dung dch HCl, phn ng xong, c cn thu c 5.91 gam cht rn. TN2: Ly 3.07 gam hn hp cho vo 300 ml dung dc HCl ( dung dich HCl nh trn ), phn ng xong, c cn thu c 6.62 gam cht rn. 1) Tnh th tch kh H2 sinh ra TN1 (ktc) v nng mol dd HCl 2) Tnh % theo khi lng hn hp 2 kim loi.

THI HA HU C HC SINH GII TNH AN GIANG NGAY 2Trng hc Lp hc Hc sinh gii tnh An Giang 12

Nm hc Mn thi Thi gian Thang im

2006 Ha hc 180 pht 10

Cu 1: (5) 1. Vit cc phng trnh phn ng km theo iu kin thc hin s chuyn ha sau, cht hu c vit di dng cng thc ct to thu gn. - C2H2 -> A -> C2H5OH -> C2H4O -> C2H3O2NH4 - C2H2 -> B -> C2H4O2 -> C2H5OOCCH3 -> C -> CH4 - C2H2 -> C2H3Cl -> B -> D -> CH2=CHOC2H5 - C2H2 -> C2H4Cl -> B -> C2H4O2 -> CH2=CHOOCCH3 -> PVA 2. Cc cht A, B, C c cng CTPT C4H9O2N. Bit A tc dng vi c HCl v Na2O. B tc dng vi hidro mi sinh to ra B' ; B' tc dng vi HCl to ra B ; B tc dg NaOH to li B ; C tc dung vi NaOH to ra mui v NH3. Cho bit A, B, C ng vi ng phn chc no ? Vit cc phng trnh phn ng dng . Cu 2: (5) 1. C 3 hp cht hu c A, B , C ln lt c CTPT l CH4O , CH2O, CH2O2. a. Vit CTCT v gi tn chng theo danh php IUPAC v thng thng. b. Vit cc PTP thc hin chuyn ha sau: (1) A -> B (2) B -> A (3) B -> C (4) A -> C c. Mt dung dich ha tan 3 cht trn. Bng nhng th nghim no chng minh s c mt ca chng. Vit cc phng trnh phn ng. 2. So snh v gii thch mnh cc axit sau : phenol, o-nitrophenol, m-nitrophenol, p-nitrophenol. 3. So snh v gii thch mnh baz ca cc dung dch cng nng : NaOH, CH3COONa, C2H5ONa , C6H5ONa Cu 3: (5). t 11,7 gam cht hu c A th thu c 9.9 g H2O, 22g CO2, 1.4 g N2. Xc nh CTPT A bit MA < 120 g/mol t 7.1 g B cn 8.4 l oxi (ktc) th thu c 4.5 g nc v hn hp kh C02 v N2 c d/H2 = 20.857 Cht C c cng thc n gin C2H60. Bit rng khi nhit phn A ta c B v C vi t l nA :nB = 2 : 1 a. Xc inh CTCT A, B, C b. T B vit cc PTP iu ch A. Cu 4: (5) Ngi ta chia 1.792 lt (ktc) hn hp kh X gm 1 ankan, 1 anken, 1 ankin lm 2 phn bng nhau: + Phn 1: Cho qua dung dc AgNO3 trong amoniac d to thnh 0.735 gam kt ta v th tch hn hp gim 12.5% + Phn 2: t chy hon ton ri hp th ton b sn phm vo 9.2 lt dung dc Ca(OH)2 0.0125 M thy c 11 gam kt ta. Xc nh CTPT ca cc hidrcacbon

THI HC SINH GII TNH NAM NHTrng hc S GD-T Nam nh

Lp hc Nm hc Mn thi Thi gian Thang im

12 2007 Ha hc 180 pht 20

Cu 1: Hy ghi li ch ch p n ng trong cc bi sau vo bi lm: 1. Cho Na vo dung dch (dd) AlCL3 th s phn ng ha hc xy ra l: A. 2 B. 3 C. 4 D. Khng xc nh 2. Dn t t V lt hn hp kh X gm CO v H2 qua ng s dng 16,8g hn hp 3 oxit (CuO, Fe3O4, Al2O3) nung nng. Phn ng xong thu c m gam cht rn v mt hn hp kh v hi. Hn hp kh v hi ny nng hn khi lng X l 0,32g. Gi tr ca V v m l: A. 0,336 lt v 16,42 gam B. 0,448 lt v 16,42 gam C. 0,448 lt v 16,48 gam D. 0,336 lt v 16,48 gam 3. Khi lng CuSO4.5H2O v khi lng dd CuSO4 8% cn dng pha thnh 280 gam dd CuSO4 16% l: A. 80 gam v 200 gam B. 40 gam v 240 gam C. 60 gam v 220 gam D. 100 gam v 180 gam Cu 2: 1. Trn 30ml dd HCL 0,05M vi 20ml dd Ba(OH)2 aM c 50ml dd c pH = b. C cn dd sau khi trn thu c 0,19875 gam cht rn khan. Hy tnh a v b bit rng dung mi l nc v trong dd c [H+][OH-] = 1014 2. Sn xut NaOH bng cch in phn dd NaCl c mng ngn xp gia 2 in cc (in cc tr). Hy vit s , phng trnh in phn. Dung dch thu c cn ln NaCl, hy nu cch loi NaCl ra khi dd . 3. It bn trn th trng cha tp cht l Cl2, Br2, H2O. Hy trnh by cch tinh ch mt lng nh I2 . Cu 3: 1. Cht hu c X cha vng benzen c cng thc phn t (CTPT) l C9H8O2. un nng X vi dd Ba(OH)2 d thu c 1 mui A v 1 andehit B. X phn ng vi Br2 trong dd theo t l s mol 1:1. Hy bin lun xc nh cng thc cu to (CTCT) ca X v vit cc phng trnh phn ng (PTPU) xy ra. 2. Mui hu c A lm ngn la n cn chuyn thnh mu vng, khi tc dng vi dd H2SO4 c nng thch hp c cht B n chc. Cht B tc dng vi etanol to ra cht D c mi d chu v tan t trong nc. t chy D ch thu c CO2 v H2O trong th tch CO2 thu c gp i th tch CO2 thu c khi t chy cng s mol B. Hy bin lun xc nh CTCT ca A, B, D v vit cc PTPU xy ra. Cu 4: Cho m gam hn hp 2 cht hu c n chc, mch h X, Y tc dng vi dd Ba(OH)2 un nng, trung ha Ba(OH)2 d cn thm tip 100ml dd HCl 0,5M. Sau th nghim, c cn dd, thu c hn hp 2 ru hn km nhau 1 nguyn t ccbon trong phn t v c 23,525 gam hn hp 3 mui khan. Cho ton b lng ru trn vo bnh ng Na d thy thot ra 1,68 lt kh H2, khi lng trong bnh ng Na tng 5,35g. Hy tnh m v xc nh CTCT ca X v Y bit rng cc phn ng xy ra hon ton. Cu 5: Hn hp X gm MO v R2O3 c t l s mol tng ng l 2:1. Dn H2 d i qua 12,3g X, un nng, th c phn rn nng 10,7g. Nu cho 12,3g X vo dd KOH d thy c 7,2g cht rn khng tan.

Xc nh cng thc cc oxit trong X bit rng MO, R2O3 l cc oxit kim loi khng tc dng vi nc v hiu sut cc phn ng u l 100%. Cu 6: Phn ng tng hp NH3 t N2 v H2 l phn ng thun nghch, ta nhit. 1. Vit phng trnh nhit ha hc ca phn ng . 2. T khi ca hn hp N2, H2 (trc khi a vo thp tng hp) so vi kh hidro l 3,6. T khi ca hn hp kh (lc cn bng) so vi khi hidro l 3,96. Hy tnh hiu sut phn ng . Cu 7: Khi tch nc t 9,9g hn hp X gm 4 ru no, n chc, mch h (c cng s mol) bng H2SO4 c 140C (hiu sut 100%) c 8,1 gam hn hp Y gm 10 ete. 1. Tnh s mol, xc nh CTCT mi ru trong X. 2. Vit CTCT cc ete c cu to i xng v gi tn cc ete . CH : 1. Hc sinh c s dng Bng h thng tun hon cc nguyn t ha hc. 2. Th tch cc kh cc bi qui v iu kin tiu chun.

THI HA HU C HC SINH GII TNH GIA LAI Vng 2Trng hc Lp hc Nm hc Mn thi Thi gian Thang im Hc sinh gii tnh Gia Lai 12 2006 Ha hc 150 pht 10

Cu I (4im) Cho s chuyn ha sau vi A,B,....,F l cc sn phm chnh Hnh:Http://img6.imageshack.us/img6/2975/13ar1.gif 1.Ghi cng thc cc tc nhn phn ng v cc iu kin thch hp nu c,thch hp vo du ? trn s phn ng . 2.Vit cc phng trnh phn ng theo s phn ng ( cc cht A,B,...,F vit di dng cng thc cu to .Trong cc hp cht trn, hp cht no c ng phn hnh hc .Vit cu trc khng gian ca cc ng phn . 3.Trnh by c ch ca cc phn ng 1 v 4 Cu II (3im) Hon thnh cc phn ng sau, ch ra tnh lp th ng ca sn phm . Hnh:Http://img15.imageshack.us/img15/1496/26kn.gif Cu III (5im) 1.Dng cng thc phi cnh v Niumen biu din cc sn phm cu cc phn ng dehydrobrom ha theo E2 a. (R,R)-2,3 dibrombutan b. meso-(R,S)-2,3 dibrombutan 2. Xut pht t brombenzen c cha v tr s 1 v cc cht v c cn thit khc (khng cha (khng cha )Hy vit cc phng trnh phn ng iu ch -anilin c v tr s 3 . -axit benzoic c cha v tr s 1 v axit benzoic c v tr s 3 .

Cu IV (4im) 1.Khi oxi ha etylenglycol bng HNO3 to thnh hn hp c 5 cht . Hy vit cng thc cu to ca 5 cht v sp xp theo trt t gim dn nhit si ca chng . Gii thch ? 2. Hp cht hu c A c tnh quang hot tc dng vi cho mt cht kh X . Nu un nng A vi m c nhit thch hp th cho 1 hidrocacbon B . Phn ng ozon phn B cho hp cht C v cht D Bit rng D cho phn ng trng gng cn C khng cho phn ng ny . Xc nh cng thc cu to ca A,B,C,D,X . Vit cc phng trnh phn ng sy ra . Cu V (4im) X l hp cht thm c cng thc. xc nh cng thc cu to X ngi ta thc hin cc th nghim sau . TN1 : oxi ha mnh X vi m c thu c 2 axit TN2 : X cho phn ng vi thuc th Grinha , sau thy phn trong mi trng axit thu c ancol bc 3 c mt nguyn t cacbon bt i . 1.Xc nh cng thc ca X tha mn th nghim 2.Xc nh cng thc ca X tha mn c hai th nghim trn . Vit cc phng trnh phn ng sy ra c 2 th nghim.

THI THNH LP I TUYN HC SINH GII D THI QUC GIATrng hc Lp hc Nm hc Mn thi Thi gian Thang im S GD-T Bnh Thun 12 2006 Ha hc 180 pht 10

Cu 2: (4 im) 1/ Sp xp theo chiu gim dn tnh axit v ghi cc hng s Ka (pKa) km theo bn cnh mi cht trong tng dy sau: a. CH3CH2CH2COOH; CH3CH2CHClCOOH; CH3CHClCH2COOH; CH2ClCH2CH2COOH.(vi Ka.10-5 khng theo th t trn l: 1,5; 3,0 ; 8,9 ; 139) b. Phenol; m-nitrophenol; p-nitrophenol; m-metylphenol; p-metylphenol. (Vi pKa khng theo th t l: 7,15; 8,4; 9,98; 10,08; 10,14) c. Axit benzoic; axit m-nitrobenzoic; axit p-hidroxibenzoic; axit p-nitrobenzoic; axit o-bitrobenzoic ( Vi pKa khng theo th t l : 4,54; 4,18; 3,49; 3,43; 2,17) 2/ T vi, than v cc cht v c cn thit khng cha cacbon, hy iu ch: p-bromnitrobenzen; 2-brom-4-nitrophenol. Cu 3: (4 im) 1/ Nu hin tng, gii thch, vit phng trnh phn ng xy ra cc th nghim sau: a. un nng dung dch KHCO3 ri ngui, dung dch thu c c mi trng axit hay baz? b. Thm ln lt cc dung dch: BaCl2, AlCl3, ZnCl2 vo dung dch thu c th nghim trn. c. Thm dung dch K2S vo ln lt cc dung dch: Ba(NO3)2, AlCl3, ZnSO4. 2/ Ha tan 1 gam NH4Cl v 1 gam Ba(OH)2.8H2O vo 80 ml nc. Pha long dung dch bng nc n 100 ml, ti 25OC. a. Tnh pH ca dung dch sau khi pha long. Bit pKa(NH4+) = 9,24. b. Tnh nng ca tt c cc ion trong dung dch.

c. Nu thm 10 ml dung dch HCl 1M vo dung dch trn th pH ca dung dch thu c l bao nhiu? Hy tnh [NH3] ca dung dch mi. Cu 4: (4 im) 1/ Cn bng ca phn ng : C + CO2 2CO xy ra 1090OC vi hng s cn bng Kp = 10. a. Tnh hm lng kh CO trong hn hp kh cn bng, bit p sut chung ca h l 1,5 atm. b. c hm lng CO bng 50% v th tch, th p sut chung l bao nhiu? 2/ Ha tan x gam mt kim loi trong 200 gam dung dch HCl 7,3% (lng axit va ) thu c dung dch A trong nng ca mui M to thnh l 11,96% (theo khi lng). a. Tnh x v xc nh kim loi M. b. B l hp cht ca M vi oxi trong M c s oxi ha l +4. Hp cht ny c kh nng oxi ha Brthnh Br2 v Cl- thnh Cl2. B ch oxi ha Br- thnh Br2 nn dng mi trng H2SO4 long hay m c? Gii thch s la chn , bit rng: M4+ + 2e = M2+ E0 = 1,23 V Br2 + 2e = 2Br- E0 = 1,07 V Cl2 + 2e = 2Cl- E0 = 1,36 V Cu 5: (4 im) Trong mt bnh kn dung tch 10 lt cha hn hp 3 andehit n chc X,Y,Z (phn t khng ch lin kt ba) v 32 gam oxi (d). un nng bnh n 136,50C cho andehit bay hi han tan, p sut trong bnh lc l 3,695 atm. Bt tia la in t chy hon tan hn hp, sau a nhit bnh v 100OC, p sut trong bnh l P (atm). Cho ton b sn phm chy ln lt i qua 2 bnh: bnh (1) ng dung dch H2SO4 c, bnh (2) ng 100 ml dug dch Ba(OH)2 1M, khi lng bnh (1) tng 2,34 gam, bnh (2) thu c 11,82 gam kt ta. un nng bnh (2) li thu thm c m gam kt ta na. 1/ Tnh m v P. 2/ Tm cng thc phn t v vit cng thc cu to ca X,Y,Z. Bit Y v Z c cng s nguyn t C, s mol X gp 4 ln tng s mol Y v Z Din n Olympia Vit Nam Ly t