CHUYN 8: CACBOHIDRAT

CHUYN 8: CACBOHIDRAT

Cu 1: Thy phn 1 kg sn cha 20% tinh bt trong mi trng axit. Vi hiu sut phn ng 85%. Lng glucoz thu c l A. 261,43 g. B. 200,8 g. C. 188,89 g. D. 192,5 g.P : (C6H10O5)n + nH2O => nC6H12O6; Ta c m Tinh bt b thy phn = 0,2 kg

=> mC6H12O6 = 188,89 g Da vo PT v CT tnh H% sp = mTT.100% / mPT m thc t (ban u) ; m phng trnh l tnh theo PT => mTT = mPT.H% / 100% m = 0,2.180.85%/(162.100%) = 188,89 g => C Cu 2: Cho m g tinh bt ln men thnh ancol etylic vi hiu sut 81%. Ton b lng CO2 sinh ra c hp th hon ton vo dd Ca(OH)2, thu c 550 g kt ta v dd X. un k dd X thu thm c 100 g kt ta. Gi tr ca m lA. 650. B. 550. C. 810. D. 750.(C6H10O5)n => nC6H12O6 => 2nC2H5OH + 2nCO2Xem li gii chuyn 1 => CT : nCO2 = n Kt ta 1 + 2. n kt ta 2 = 5,5 + 2. 1 = 7,5 mol

=> n Tinh bt = nCO2 / 2 => m Tinh bt = 750 g Da vo H% p = mPT.100% / mTT => m TT = mPT.100% / mPTm = (5,5 + 2. 1).162 . 100% / (2.81%) = 750 g => D Cu 3: Th tch dd HNO3 67,5% (khi lng ring l 1,5 g/ml) cn dng tc dng vi xenluloz to thnh 89,1 kg xenluloz trinitrat l (bit lng HNO3 b hao ht l 20 %)A. 70 lt.B. 49 lt.C. 81 lt.D. 55 lt.P : (C6H7O2(OH)3) + 3HNO3 => (C6H7O2(NO2)3) + 3H2O

0,9 mol mddHNO3 CT tnh C% => m dd HNO3Quy t mdd sang Vdd => V HNO3 = 70 lt Da vo b hao ht 20% nh => lng HNO3 cn dng l 80% so vi lng PT Bn gii nhm = 89,1 .63.100%.3.100% / (67,5%.1,5.297.80%) = 70 lt => A Cu 4: Ln men m g glucoz vi hiu sut 90%. Lng CO2 sinh ra c hp th vo dd Ca(OH)2 thu c 10 g kt ta v khi lng dd gim 3,4 g. Gi tr ca m l

A. 30.B. 15.C. 17.D. 34.Xem li gii chuyn 1 => ddm gim = m kt ta mCO2 ( mCO2 = 6,6 g => nCO2 = 0,15 mol

=> nGlucozo = nCO2 / 2 = 0,075 mol => m glucozo ... = 15 g H% p = mPT.100%/ mTT

m = (10-3,4).100% .180/(44.2.90%) = 15g => B Cu 5: Thy phn hon ton 62,5 g dd saccaroz 17,1% trong mi trng axit (va ) c dd X. Cho dd AgNO3/NH3 vo X un nh c m g Ag. Gi tr ca m l

A. 6,75.B. 13,5.C. 10,8.D. 7,5.Cu 6: Cho 34,2 g hn hp saccaroz c ln mantoz phn ng hon ton dd AgNO3/NH3 d thu c 0,216 g bc. tinh khit ca saccaroz l

A. 1%.B. 99%.C. 90%.D. 10%.Ch c mantozo p => 2.nMatozo = nAg V mantozo c 1 gc CHO xem CT chuyn 6 => 2x.nX = nAg vi x l s gc CHO ca X => m mantozo = 0,342 g => m Sacarozo => tinh khit = 99% Ly m sacarozo / m hhCu 7: Kh cacbonic chim t l 0,03% th tch khng kh. Mun to ra 500g tinh bt th cn bao nhiu lt khng kh ( ktc) cung cp CO2 cho phn ng quang hp?

A. 1382716 lt. B. 1382600 lt.C. 1402666,7 lt. D. 1382766 lt. Bi ny c lin quan n s to thnh tinh bt trong cy xanh

264n(gam).........................................162n (gam)

T PT: => mCO2= (264n. 500)/ 162n= 814,8148148 (gam)

=> VCO2= (mCO2/44). 22,4= 414,8148148 (lt)

V CO2 chim 0,03% th tch khng kh:

=> V(khng kh) = (414,8148148. 100)/ 0,03 = 1382716 (lt) => A

mCO2 = (500.100%.6.22,4) / (0,03% . 162) = 1382716 ltCu 8: Cho xenluloz phn ng vi anhirit axetic (C H2SO4 c lm xc tc) thu c 11,1g hn hp X gm xenluloz triaxetat, xenluloz iaxetat v 6,6g CH3COOH. Thnh phn phn trm theo khi lng ca xenluloz triaxetat v xenluloz iaxetat trong X ln lt l

A. 77% v 23%.

B. 77,84% v 22,16%.

C. 76,84% v 23,16%. D. 70% v 30%.PT : (C6H7O2(OH)3)n + 3CH3COOH => (C6H7O2(OOCCH3)3) tri + 3H2O

(C6H7O2(OH)3)n + 2CH3COOH => (C6H7O2(OOCCH3)2) i + 2H2OGi x , y l s mol tri v i => 288x + 246y = 11,1 ; 3x + 2y = 0,11 => x v y => m => % => B

Mo ko cn nh PT

Ta lun c M v tri = M v phi PT => M tri = M xenlulozo + 3.MCH3COOH 3MH2O = 162 + 3.60 3.18 = 288

Tng t M di Ci ny quan trng ch cn nh c ch nh este : ru + axit => este + H2O - Tch H2OCu 9: Ln men m g glucoz vi hiu sut 72%. Lng CO2 sinh ra c hp th hon ton vo 500 ml dd hn hp gm NaOH 0,1M v Ba(OH)2 0,2M, sinh ra 9,85 g kt ta. Gi tr ca m l

A. 25,00.B. 12,96.C. 6,25.D. 13,00.Xem chuyn 12 Phng php th CT : nCO2 = nOH- - nCO3(2-) = nNaOH + 2nBa(OH)2 nBaCO3 = 0,05 + 0, 2 0,05 = 0,2 mol=> n glucozo => m = 25 g H% p = mPT . 100% / mTTm = (0,5.0,1 + 0,5.0,2.2 0,05).180.100% / (2.72%) = 25 g => A Cu 10: Thy phn 324 g tinh bt vi hiu sut ca phn ng l 75%, khi lng glucoz thu c l

A. 360 g. B. 270 g. C. 250 g. D. 300 g.PT : (C6H10O5)n + nH2O => nC6H12O6 m tinh bt => m glucozo => m = 270 g H% sp = mTT.100% / mPT => mTT = mPT .H% / 100%m = (324.180.75%)/(162.100%) = 270g => B Cu 11: Cho 360 g glucoz ln men thnh ancol etylic v cho ton b kh CO2 sinh ra hp th vo dd NaOH d c 318 g mui. Hiu sut phn ng ln men l

A. 50,0%.B. 62,5%.C. 75,0%.D. 80,0%.dd NaOH d => To ra mui Na2CO3 => nCO2 = nNa2CO3 = 3 mol => nGlu = 1,5 mol V cn bng PT

=> mPT glu => H% p = mPT.100% / mTT = 75% H% = (318.100%.180)/(106.360.2) = 75%Cu 12: Cho m g glucoz v fructoz tc dng vi lng d dd AgNO3/NH3 to ra 43,2 g Ag. Cng m g hn hp ny tc dng va ht vi 8 g Br2 trong dd. S mol glucoz v fructoz trong hn hp ny ln lt l

A. 0,05 mol v 0,15 mol.

B. 0,10 mol v 0,15 mol.

C. 0,2 mol v 0,2 mol. D. 0,05 mol v 0,35 mol.Glu v Fru u p vi AgNO3/NH3 => 2x + 2y = nAg = 0,4 v c 2 u c 1 gc CHO

Ch c glu p vi Br2 => nGlu = x = nBr2 = 0,05 => y = 0,15 => A Cu 13: c 29,7 kg xenluloz trinitrat, cn dng dd cha m kg axit nitric (hiu sut phn ng t 90%). Gi tr ca m l

A. 30. B. 10. C. 21. D. 42.H% p = mPT.100% / mTT => mTT = mPT.100% / H%m = (29,7.100%.63.3)/(297.90%) = 21 kg => C Cu 14: Khi t chy mt cacbohrat X c= 33 : 88. CTPT ca X l

A. C6H12O6.B. C12H22O11.C. (C6H10O5)n.D. Cn(H2O)m.T chn lng cht => chn mH2O = 3 g => mCO2 = 8 g

Xem chuyn 1 : => s C / s H Ca cht hu c = nC / 2nH2O = 6/11 => B tha mn Ci ny da vo PT suy raCu 15: Phn ng no sau y chng t glucoz c cu to mch vng?

A. Phn ng CH3OH/HCl. B. Phn ng vi Cu(OH)2.

C. Phn ng vi dd AgNO3 / NH3.D. Phn ng H2/Ni,t0.Xem t l thuyt => A Cu 16: Phn ng vi cht no sau y c th chuyn ho glucoz, fructoz thnh nhng sn phm ging nhau? A. Phn ng H2 /Ni, t0. B. Phn ng vi Cu(OH)2. C. Dd AgNO3. D. Phn ng vi Na.L thuyt => A : c 2 p u to ra sobitol : CH2OH[CHOH]4CHO + H2 CH2OH[CHOH]4CH2OH CH2OH[CHOH]3COCH2OH + H2

(sobitol) Cu 17: Chn cu ni ng

A. Xenluloz c phn t khi ln hn nhiu so vi tinh bt.

B. Xenluloz v tinh bt c phn t khi nh.

C. Xenluloz c phn t khi nh hn tinh bt.

D. Xenluloz v tinh bt c phn t khi bng nhau.L thuyt

Xenlulozo c khi lng phn t rt ln (khong 1.000.000 2.400.000)

Tinh bt c phn t khi (150.000 600.000 i vi amilozo v 300.000 3.000.000 i vi amilopectin)

=> T trn => p n A l kh nng ng hn so vi cc p n cn li. cu ny nh may thng amilopectin n hn th chng c p n no => Sa thnh thng c phn t khi ln hn th ng hn.Cu 18: Da vo tnh cht no kt lun tinh bt v xenluloz l nhng polime thin nhin c cng thc (C6H10O5)n:

A. Tinh bt v xenluloz khi b t chy u cho CO2 v H2O theo t l s mol 6:5.

B. Tinh bt v xenluloz khi b thu phn n cng u cho glucoz.

C. Tinh bt v xenluloz u tan trong nc.

D. Tinh bt v xenluloz u c th lm thc n cho ngi v gia sc.L thuyt : PT : (C6H10O5)n + nH2O nC6H12O6 => B A sai theo mnh th 2 ci thng ln tp cht => t l khng th 6 : 5 c

Cu 19: Mt cht khi thy phn trong mi trng axit, un nng khng to ra glucoz. Cht l

A. tinh bt. B. saccaroz. C. xenluloz. D. protit.L thuyt => D sai A,B,C u ng bn xem t l thuytCu 20: Khi thu phn saccaroz, sn phm thu c l

A. glucoz v fructoz. B. ch c glucoz.C. ch c fructoz.

D. ch c mantoz.L thuyt : C12H22O11 + H2O => C6H12O6 glu + C6H12O6fru => A Cu 21: Gluxit (cacbohirat) ch cha hai gc glucoz trong phn t l

A. tinh bt.B. xenluloz.C. saccaroz.D. mantoz.L thuyt : trng thi tinh th, phn t mantoz gm 2 gc glucoz lin kt vi nhau C1 ca gc glucoz ny vi C4 ca gc glucoz kia qua mt nguyn t oxi => D Cu 22: C th phn bit xenluloz vi tinh bt nh phn ng

A. vi axit H2SO4.B. vi kim.C. vi dd it.D. thu phn.L thuyt => dd Iot => Tinh bt mu tm , xenlulozo ko c g => C

Thm: - H tinh bt + dung dch I2 hp cht mu xanh tm

- un nng th thy mt mu, ngui th mu xanh tm li xut hin

Cu 23: Mt cacbohirat (Z) c cc phn ng din ra theo s chuyn ha sau:

Zdd xanh lam kt ta gch

Vy Z khng th l

A. glucoz.B. saccaroz.C. fructoz. D. Tt c u sai.Cu 24: Nhm cc cht u tham gia phn ng trng bc v phn ng kh Cu(OH)2 thnh Cu2O l

A. glucoz v mantoz.B. glucoz v xenluloz.

C. glucoz v saccaroz.D. saccaroz v mantoz.L thuyt : Cht tham gia p trang bc => Glu v man => A Cu 25: Cho cc dd sau: CH3COOH, C2H4(OH)2, C3H5(OH)3, glucoz, saccaroz, C2H5OH. S lng dd c th ho tan c Cu(OH)2 l

A. 4. B. 5.C. 6.D. 3.5 cht u: => B PT : 2CH3COOH + Cu(OH)2 => (CH3COO)2Cu + 2H2O

2C2H4(OH)2 + Cu(OH)2 => ..... + 2H2O2C3H5(OH)3 + Cu(OH)2 => .... + 2H2O2C6H12O6 + Cu(OH)(C6H11O6)2Cu + 2H2O

2C12H22O11 + Cu(OH)2 (C12H21O11)2Cu + 2H2O Cu 26: Dy cht m tt c cc cht u tc dng c vi dd AgNO3/NH3 l

A. CH3CHO, C2H2, saccaroz.B. CH3CHO, C2H2, anilin.

C. CH3CHO, C2H2, saccaroz, glucoz. D. HCOOH, CH3CHO, C2H2, glucoz.Cht c gc CHO v cht c lin kt 3 u => D Loi A, B v sacarozo ko c gc CHO ; Loi B v anilin Cu 27: Cho khi lng ring ca cn nguyn cht l D = 0,8 g/ml. Hi t 10 tn v bo (cha 80% xenluloz) c th iu ch c bao nhiu lt cn thc phm 40 (bit hiu sut ca ton b qu trnh iu ch l 64,8%)? A. 294 lt. B. 920 lt. C. 368 lt.D. 147,2 lt.Lng xen dng iu ch = 8 tn 80% => mC2H5OH => Vdd C2H5OH => V = 920 lt ru = V nguyn cht .100% / V hn hp => V hn hp = V nguyn cht .100 / ruH% sp = mTT.100%/ mPT => mTT = mPT .H% / 100%

V = (0,8.2.46.100.64,8%)/(162.0,8.40.100%) = 920 lt v n v l tn = 1000 kg => n v V = 103 ltCu 28: Xenluloz tc dng vi (CH3CO)2O (xc tc H2SO4 c) to ra 9,84 g este axetat v 4,8 g CH3COOH. CTPT ca este axetat l

A. [C6H7O2(OOCCH3)3]n. B. [C6H7O2(OOCCH3)2OH]n.

C. [C6H7O2(OOCCH3)(OH)2]n. D. [C6H7O2(OOCCH3)3]n v [C6H7O2(OOCCH3)OH]n.PT : [C6H7O2(OH)3]n + nm(CH3CO)2O [C6H7O2(OH)3-m(OCOCH3)m]n +nmCH3COOH

0,08/nm M este = 123nm = (162 + 42m)n => m = 2 => B Cu 29: Cho 10 kg glucoz cha 10% tp cht ln men thnh ancol. Tnh th tch ancol 46 thu c. Bit ancol nguyn cht c khi lng ring 0,8 g/ml v trong qu trnh ch bin ancol b hao ht mt 5%.

A. 11,875 lt.B. 2,785 lt.C. 2,185 lt.D. 3,875 lt.

m glu s dung = 9 kg => mC2H5OH => Vdd = 11,875 lt ; ru = V nguyn cht . 100 / V hn hp => V hn hp = V nguyn cht .100 / ru; hao ht mt 5% => m dng = 95% m PT V = m / d = (9.2.46.100.95%)/(180.0,8.46.100%) = 11,875 lt Cu 30: Trong phn t ca cacbohyrat lun c

A. nhm chc axit. B. nhm chc xeton. C. nhm chc ancol. D. nhm chc anehit.L thuyt => C Cacbohidrat u c nhm OH hay nhm chc ancolCu 31: Cht thuc loi isaccarit l

A. glucoz.

B. saccaroz.

C. xenluloz.

D. fructoz.L thuyt => B mono l glu v fru , i l sac v manCu 32: Hai cht ng phn ca nhau l

A. glucoz v mantoz. B. fructoz v glucoz. C. fructoz v mantoz. D. saccaroz v glucoz.L thuyt => B u c CT : C6H12O6Cu 33: Tm t thch hp in vo ch trng trong on vn sau:

dng mch h glucoz v fructoz u c nhm cacbonyl, nhng trong phn t glucoz nhm cacbonyl nguyn t C s , cn trong phn t fructoz nhm cacbonyl nguyn t C s. Trong mi trng baz, fructoz c th chuyn ho thnh v

A. 1, 2, glucoz, ngc li.

B. 2, 2, glucoz, ngc li.

C. 2, 1, glucoz, ngc li.

D. 1, 2, glucoz, mantoz.

Xem t l thuyt => A .

; 6 5 4 3 2 1

- Trong mi trng trung tnh hoc axit, fructoz khng th hin tnh kh ca anehit, nhng trong mi trng kim, fructoz li c tnh cht ny do c s chuyn ha gia glucoz v fructoz qua trung gian l mt eniol.Cu 34: Cacbohirat l g?

A. Cacbohirat l nhng hp cht hu c a chc v a s chng c cng thc chung l Cn(H2O)m.

B. Cacbohirat l nhng hp cht hu c tp chc v a s chng c cng thc chung l Cn(H2O)m.

C. Cacbohirat l nhng hp cht hu c tp chc.

D. Cacbohirat l nhng hp cht hu c a chc v a s chng c cng thc chung l Cn(H2O)n.L thuyt c bn => B Cu 35: C my loi cacbohirat quan trng?

A. 1 loi.

B. 2 loi.

C. 3 loi.

D. 4 loi.

L thuyt : monosacarit , isacarit , polisacarit => 3 loi => C Cu 36: Nhng th nghim no chng minh c cu to phn t ca glucoz?

A. phn ng vi Na v vi dung dch AgNO3 trong amoniac.

B. phn ng vi NaOH v vi dung dch AgNO3 trong amoniac.

C. phn ng vi CuO v vi dung dch AgNO3 trong amoniac.

D. phn ng vi Cu(OH)2 v vi dung dch AgNO3 trong amoniac.L thuyt phn glucozo => D P vi Cu(OH)2 l tnh cht nhm OH , vi AgNO3 / NH3 l tnh cht nhm CHOCu 37: trng bc mt chic gng soi, ngi ta phi un nng dung dch cha 36g glucoz vi lng va dung dch AgNO3 trong amoniac. Khi lng bc sinh ra bm vo mt knh ca gng v khi lng AgNO3 cn dng ln lt l (bit cc phn ng xy ra hon ton)

A. 68,0g; 43,2g.

B. 21,6g; 68,0g.

C. 43,2g; 68,0g.

D. 43,2g; 34,0g.Ta c 2n Glu = nAg => nAg = 0,4 mol => nAgNO3 = 0,4 BT NT Ag=> C Cu 38: Phng n no di y c th phn bit c saccaroz, tinh bt v xenluloz dng bt?

A. Cho tng cht tc dng vi dung dch HNO3/H2SO4.

B. Cho tng cht tc dng vi dung dch iot.

C. Ho tan tng cht vo nc, sau un nng v th vi dung dch iot.

D. Cho tng cht tc dng vi vi sa Ca(OH)2.Mo nhng bi c tinh bt thng c p n l Iot => Loi A v D Loi B v nu ch dng Iot th ch phn bit c tinh bt.

=> C ng : gii thch:

Cu 39: phn bit cc dung dch glucoz, saccaroz v anehit axetic c th dng cht no trong cc cht sau lm thuc th ?

A. Cu(OH)2/OH(.

B. NaOH.

C. HNO3.

D. AgNO3/NH3.Bi tp dng ny thng l Cu(OH)2/OH- => Bn nn xt p n .

Nhn thy : Khi cho Cu(OH)2/OH- ta thy.Vo Glu to ra dd mu xanh lam.Vo Sacca ko phn ng.

Vo Andehit axetic to ra kt ta gch.Cu 40: C bn l mt nhn cha: Glixerol, ancol etylic, glucoz v axit axetic. Thuc th no sau y c th dng phn bit cc dung dch trong tng l trn ?

A. [Ag(NH3)2]OH.

B. Na kim loi.

C. Cu(OH)2 trong mi trng kim.

D. Nc brom.Cu 41: phn bit cc cht: Glucoz, glixerol, anehit axetic, lng trng trng v ru etylic, c th ch dng mt thuc th no sau y?

A. dung dch HNO3.

B. Cu(OH)2/OH(.

C. dung dch AgNO3/NH3. D. dung dch brom.Ci lng trng trng => Bn m bi protein chng III: amin aminoaxit

=> Dng Cu(OH)2/OH- l hp l Gii thch: Mo v c lng trng trng => Thng phi dng Cu(OH)2

To ra dd xanh lam l Glixerol.To ra dd mu tm l Lng trng trng.

To ra kt ta gch l Glucozo.

Cu 42: Chn cch phn bit cc dung dch sau y: Lng trng trng, h tinh bt, glixerol.

A. Iot lm h tinh bt ho xanh, glixerol tc dng vi Cu(OH)2 nhit thng to dung dch xanh lam c trng, cn li lng trng trng.

B. Glixerol tc dng Cu(OH)2 nhit thng to dung dch xanh lam c trng, lng trng trng tc dng Cu(OH)2 cho mu xanh tm, cn li h tinh bt.

C. Iot lm h tinh bt ho xanh, khi un nng lng trng trng ng t, cn li glixerol.

D. C B, C u ng.Cu 43: C 4 dung dch long khng mu gm: Lng trng trng, glixerol, KOH v axit axetic. Ch dng mt thuc th no sau y phn bit chng.

A. dung dch HCl.

B. dung dch CuSO4.C. dung dch KMnO4.

D. dung dch HNO3 c.Cu 44: Chn cu pht biu sai:

A. Saccaroz l mt isaccarit.

B. Tinh bt v xenluloz u l polisaccarit, ch khc nhau v cu to ca gc glucoz.

C. Khi thu phn n cng saccaroz, tinh bt v xenluloz u cho mt loi monosaccarit.

D. Khi thu phn n cng, tinh bt v xenluloz u cho glucoz.

Sacca to ra glu v fru , tnh bt v xenlu to ra glu => Khng th to ra 1 loi mono c => C Cu 45: Cng l cht rn kt tinh, khng mu, khng mi, d tan trong nc, c v ngt l tnh cht vt l v trng thi t nhin ca nhm cht no sau y?

A. glucoz v saccaroz.

B. glucoz v tinh bt.

C. glucoz v xenluloz.

D. saccaroz v tinh bt.

D dng loi p n c xenlu v tinh bt v c 2 ci kh tan trong nc hoc ko tan => A hoc c th nh l thuyt Cu 46: Cho cc cht glucoz, fructoz, saccaroz, tinh bt, xenluloz. Cht va c tnh cht ca ancol a chc, va c tnh cht ca anehit l

A. ch c glucoz.

B. glucoz v fructoz.

C. glucoz, fructoz v saccaroz.

D. tt c cc cht cho.

Tt c cacbohidrat u c tnh cht ancol ; nhng c tnh cht andehit Tc l c gc CHO ch c glucozo v mantozoCu 47: trng bc mt s rut phch, ngi ta phi dng 100g saccaroz. Khi lng AgNO3 cn dng v khi lng Ag to ra ln lt l (gi thit rng, s chuyn ho ca fructoz l khng ng k v hiu sut cc phn ng u t 90%)

A. 88,74g; 50,74g.

B. 102,0g; 52,5g.

C. 52,5g; 91,8g.

D. 91,8g; 64,8g.Sacca c 2 gc glu => c 2 gc CHO => 4n saca = nAg = nAgNO3 = Cu 48: Khi t chy hon ton mt hp cht hu c thu c hn hp kh CO2 v hi nc c t l mol l 1:1. Cht ny c th ln men ru (ancol). Cht l cht no trong cc cht sau ?

A. axit axetic.

B. glucoz.

C. sacacroz.

D. hex-3-en.

Cu 49: Khi thu phn 1kg bt go c 80% tinh bt, th khi lng glucoz thu c l bao nhiu ? Gi thit rng, phn ng xy ra hon ton.

A. 0,80kg.

B. 0,90kg.

C. 0,99kg.

D. 0,89kg.PT : (C6H10O5)n + nH2O => nC6H12O6

162n

180n

0,8 kg

=> 0,89 kg => D Cu 50: Tnh khi lng glucoz to thnh khi thu phn 1kg mn ca c 50% xenluloz. Gi thit hiu sut phn ng l 80%.

A. 0,555kg.

B. 0,444kg.

C. 0,500kg.

D. 0,690kg.PT : (C6H10O5)n + nH2O => nC6H12O6

162n

180n

0,5 kg

=> 0,555 kg

H% sp = mTT.100%/mPT ( mTT = mPT.H%/100% = 0,555.80%/100% = 0,444 => B Cu 51: Nhm gluxit u tham gia phn ng thu phn l

A. Saccaroz, mantoz, glucoz.

B. Saccaroz, fructoz, xenluloz.C. Mantoz, tinh bt, xenluloz.

D. Saccaroz, glucoz, tinh bt.Disacarit v polisacarit u c p thy phn. V n cha 2 nhm monosacarit=> C Hoc loi A,B,D v cha glu v frucCu 52: Nhm gluxit u c kh nng tham gia phn ng trng gng l

A. Glucoz, fructoz, saccaroz.

B. Glucoz, fructoz, tinh bt.

C. Glucoz, fructoz, xenluloz.

D. Glucoz, fructoz, mantoz. L thuyt c bn => D hoc loi A,B,C v cha xenlu, tinh bt v sacCu 53: Cho glucoz ln men to thnh ancol, kh CO2 to thnh c dn qua dung dch nc vi trong d, thu c 50g kt ta, bit hiu sut ln men l 80%, khi lng ancol thu c l

A. 23,0g.

B. 18,4g.

C. 27,6g.

D. 28,0g.n kt ta (CaCO3) = nCO2 = 0,5 mol = nC2H5OH => mC2H5OH (PT) = 23 g

H% sp = mTT.100% / mPT => mTT C2H5OH = 23 . 0,8 = 18,4 g => B Cu 54: Chn s phn ng ng ca glucoz

A. C6H12O6 + Cu(OH)2 kt ta gch

B. C6H12O6 CH3CH(OH)COOHC. C6H12O6 + CuO Dung dch mu xanh

D. C6H12O6 C2H5OH + O2

Xem phn l thuyt :A sai => dd mu xanh lam

B ng Kin thc ngoi : glu ln men => Axit lactic (CH3-CH(OH) COOH) C sai Ko c p

D sai : Glu => 2C2H5OH + 2CO2Cu 55: Nhm gluxit khi thu phn hon ton u ch to thnh glucoz l:

A. Saccaroz, mantoz, tinh bt.

B. Saccaroz, mantoz, xenluloz.

C. Mantoz, tinh bt, xenluloz.

D. Saccaroz, mantoz, tinh bt, xenluloz. L thuyt Ch bi Ch to ra glucozo => A,B,D loi v cha saca Do saca thy phn ra fruc v glu=> C C th da vo man ch cha 2 nhm glu => thy phn to ra glu

Tinh bt v xenlulozo d thy => glu Cu 56: Pht biu no sau y khng ng ?

A. Glucoz v fructoz l ng phn cu to ca nhau.

B. Metyl ( - glucozit khng th chuyn sang dng mch h.

C. Trong dung dch, glucoz tn ti dng mch vng u tin hn dng mch h.

D. C th phn bit glucoz v fructoz bng phn ng trng bc.L thuyt c bn => D :V fruc v glu u p trng bc.Cu 57: Bit CO2 chim 0,03% th tch khng kh, th tch khng kh (ktc) cn cung cp cho cy xanh quang hp to 162g tinh bt l

A. 112.103 lt.

B. 448.103 lt.

C. 336.103 lt.

D. 224.103 lt.

PT :

264n

162n

264g

nCO2 = 6 mol => VCO2 = 6.22,4 = 134,4 lt

=> V kk = VCO2 . 100% / 0,03 = 448 .103 lt => B Cu 58: Glucoz tc dng c vi tt c cht trong nhm cht no sau y?

A. H2/Ni , nhit ; Cu(OH)2; [Ag(NH3)2]OH; H2O/H+, nhit .

B. [Ag(NH3)2]OH; Cu(OH)2; H2/Ni, un nng; CH3COOH/H2SO4 c, un nng.

C. H2/Ni , nhit ; [Ag(NH3)2]OH; NaOH; Cu(OH)2.

D. H2/Ni , nhit ; [Ag(NH3)2]OH; Na2CO3; Cu(OH)2. L thuyt c bn => B Hoc loi A v cha H2O/H+ mono ko b thy phn

Loi C V NaOH Loi D V Na2CO3Cu 59: Chn cu pht biu sai:

A. Phn bit glucoz v saccaroz bng phn ng trng gng.

B. Phn bit mantoz v saccaroz bng phn ng trng gng.

C. Phn bit tinh bt v xenluloz bng I2.

D. Phn bit saccaroz v glixerol bng Cu(OH)2.Tt c cabohidrat u p vi Cu(OH)2 => dd mu xanh lam Glixerol p vi Cu(OH)2 => dd xanh lam => D

Tnh cht 2 nhm OH k nhau => P c vi Cu(OH)2 => dd xanh lamCu 60: Chn cu pht biu ng:

A. Phn bit glucoz v fructoz bng phn ng trng gng.

B. Tinh bt c cu trc phn t mch khng phn nhnh.

C. Dung dch mantoz c tnh kh v b thu phn thnh glucoz.

D. Phn bit saccaroz v glixerol bng phn ng thu phn.Mantozo c cu trc l 2 gc glu => c tnh cht ca glu hay tnh kh Th hin p vi AgNO3/NH3Mantozo thy phn ch to ra glucozo.

A sai v c 2 ci u p , B sai v Tinh bt c cu trc phn nhnh

D sai v thy phn khng nhn ra c g. Cu 61: Phng trnh: 6nCO2 + 5nH2O (C6H10O5)n + 6nO2, l phn ng ho hc chnh ca qu trnh no sau y?

A. qu trnh h hp.

B. qu trnh quang hp.

C. qu trnh kh.

D. qu trnh oxi ho. L thuyt c bn => B Quang hp

Cu 62: Cho s phn ng: Thuc sng khng khi X Y sobit. Tn gi X, Y ln lt l

A. xenluloz, glucoz. B. tinh bt, etanol.

C. mantoz, etanol. D. saccaroz, etanol.L thuyt :

X => Thuc sng khng khi => X l xenlulozo => A

[C6H7O2(OH)3]n + 3nHNO3 (c) [C6H7O2(ONO2)3]n + 3nH2OXenluloz trinitrat

- Hn hp cha ch yu xenluloz trinitrat c gi l piroxilin (lm cht n), dng ch to thuc sng khng khi. Phn ng n xy ra nh sau:

2[C6H7O2(ONO2)3]n 6nCO2 + 6nCO + 4nH2O + 3nN2 + 3nH2

Hoc Y to ra sobit => Y l glu . CH2OH[CHOH]4CHO + H2 CH2OH[CHOH]4CH2OH

(sobitol hay sobit)Cu 63: Phn ng kh glucoz l phn ng no sau y ?

A. Glucoz + H2/Ni , to.

B. Glucoz + Cu(OH)2.

C. Glucoz + [Ag(NH3)2]OH.

D. Glucoz etanol. Phn ng kh glucozo => Hay glucozo l cht oxihoa

=> A ng : Thy H2 l cht kh H2o 2e => 2H+ => Glu l cht oxi ha

iu ch 45g axit lactic t tinh bt v qua con ng ln men lactic, hiu sut thu phn tinh bt v ln men lactic tng ng l 90% v 80%. Khi lng tinh bt cn dng l

A. 50g.

B. 56,25g.

C. 56g.

D. 60g. Tinh bt => Glu =>

2CH3 CH(OH) COOH Axit lacticnAxit = 0,5 mol => nTinh bot = 0,25 mol => m tinh bot = 40,5 g

H% p = mPT.100% / mTT ( mTT = mPT.100% / H% = 40,5 . 100%.100% / (90%.80%) = 56,25 g => B

Cu 64: Phn ng chuyn glucoz, fructoz thnh nhng sn phm ging nhau l

A. phn ng vi Cu(OH)2.

B. phn ng trng gng.

C. phn ng vi H2/Ni. to.

D. phn ng vi kim loi Na.L thuyt => C u to ra : CH2OH[CHOH]4CH2OH(sobitol)

Cu 65: Thuc th phn bit glucoz vi fructoz l

A. [Ag(NH3)2]OH.

B. Cu(OH)2.

C. dung dch Br2.

D. H2.L thuyt => C Glu lm mt mu dd Br2 v c gc CHO => tnh cht andehit ; Fruc ko lm mt mu Gc C=O tnh cht ca xeton ko p Cu 66: Cacbohirat (gluxit) l nhng hp cht hu c tp chc v c cng thc chung l

A. Cn(H2O)m.

B. C.nH2O.

C. CxHyOz.

D. R(OH)x(CHO)y.L thuyt => A Cu 67: Cng thc phn t v cng thc cu to ca xenluloz ln lt l

A. (C6H12O6)n, [C6H7O2(OH)3]n.

B.(C6H10O5)n, [C6H7O2(OH)3]n.

C. [C6H7O2(OH)3]n, (C6H10O5)n. D. (C6H10O5)n, [C6H7O2(OH)2]n.L thuyt => B Cu 68: Mt polisaccarit (C6H10O5)n c khi lng phn t l 162000u, n c gi tr l

A. 900.

B. 950.

C. 1000.

D. 1500.Ta c M polisaccarit = 162n = 162000 ( n = 1000 => C Cu 69: Gluxit khng th thu phn c na l

A. Glucoz, mantoz.

B. Glucoz, tinh bt.

C. Glucoz, xenluloz.

D. Glucoz, fructoz.Mono khng b thy phn => D . (A,B,C cha man , tinh bt, xenlu => u thy phn cCu 70: Cacbohirat khi thu phn to ra 2 phn t monosaccarit l

A. Saccaroz, tinh bt.

B. saccaroz, xenluloz.

C. Mantoz, saccaroz.

D.Saccaroz, glucoz.

=> To ra 2 monosaccarit => isaccarit => B ( man to ra glucoz; sac to ra glucoz v gc fructoz => gp c 2 trng hp => to ra glucoz v gc fructoz 2 monoCu 71: Saccaroz v glucoz c c im ging nhau l

A. u ly t c ci ng.

B. u tham gia phn ng trng gng.

C. u ho tan Cu(OH)2 nhit thng to dung dch mu xanh c trng.

D. u c trong bit dc huyt thanh ngt.Tt c cc gluxit u p vi Cu(OH)2 nhit thng => dd mu xanh lam => C Cu 72: Polisaccarit khi thu phn n cng to ra nhiu monosaccarit l

A. Tinh bt, amiloz.

B. Tinh bt, xenluloz.

C. Xenluloz, amiloz.

D. Xenluloz, amilopectin. Cu 73: Cht khng phn ng vi glucoz l

A. [Ag(NH3)2]OH.

B. Cu(OH)2.

C. H2/Ni.

D. I2. L thuyt c bn => D Cu 74: Trong mu ngi, nng ca glucoz c gi tr hu nh khng i l

A. 0,1%.

B. 0,2%.

C. 0,3%.

D. 0,4%.L thuyt c bn => A Cu 75: xc nh trong nc tiu ca ngi b bnh tiu ng c cha mt lng nh glucoz, c th dng 2 phn ng ho hc l

A. phn ng trng gng, phn ng cng hiro.

B. phn ng trng gng, phn ng ln men ru etylic.

C. phn ng trng gng, phn ng kh Cu(OH)2.

D. phn ng trng gng, phn ng thu phn.Dng p c trng => P trng gng Thy c kt ta Ag ; P Cu(OH)2 Thy c dd mu xanh => CNu dng A => Cng H2 ko g

Nu dng B => Ln men ru ko c g.

Nu dng D th cng ko c g glu ko b thy phn.Cu 76: Sobit (sobitol) l sn phm ca phn ng

A. kh glucoz bng H2/Ni, to.

B. oxi ho glucoz bng [Ag(NH3)2]OH.

C. ln men ru etylic.

D. glucoz tc dng vi Cu(OH)2. L thuyt c bn => A Cu 77: Gluxit chuyn ho thnh glucoz trong mi trng kim l

A. saccaroz.

B. mantoz.

C. fructoz.

D. tinh bt.L thuyt c bn => C - Trong mi trng trung tnh hoc axit, fructoz khng th hin tnh kh ca anehit, nhng trong mi trng kim, fructoz li c tnh cht ny do c s chuyn ha gia glucoz v fructoz qua trung gian l mt eniol.

glucoz eniol fructoz Cu 78: Tinh bt trong go np cha khong 98% l

A. amiloz.

B. amilopectin.

C. glixerol.

D. alanin.Cu 79: Phn ng chng t glucoz c nhiu nhm OH cc nguyn t cacbon lin tip nhau l phn ng vi

A. dung dch AgNO3 trong dung dch NH3.

B. Cu(OH)2 nhit thng.

C. tc dng vi axit to este c 5 gc axit.

D. Cu(OH)2 nhit cao.

L thuyt c bn SGK nc ghi rt r p chng minh glucozo c nhiu nhm OH => B Cu 80: Phn ng chng minh glucoz c nhm chc anehit l

A. tc dng vi Cu(OH)2 to dung dch c mu xanh c trng.

B. tc dng vi axit to sobitol.

C. phn ng ln men ru etylic.

D. phn ng trng gng. L thuyt c bn => D Cu 81: Phn t glucoz tc dng vi Cu(OH)2 cho , vy trong phn t Tng t nh glucoz, cng vi hiro cho , b oxi ho bi trong mi trng baz. Cacbohirat l nhng v a s chng c cng thc chung l

(1) dung dch mu xanh lam; (2) c nhiu nhm OH; (3) v tr k nhau; (4) fructoz; (5) poliancol; (6) phc bc amoniac; (7) hp cht hu c tp chc; (8) Cn(H2O)m.

T hay cm t thch hp nhng ch trng trong cc cu on vn trn ln lt l

A. (2), (3), (1), (4), (5), (6), (7), (8).

B. (1), (2), (4), (5), (3), (6), (7), (8).

C. (1), (2), (3), (4), (5), (6), (7), (8).

D. (1), (2), (3), (4), (8), (6), (7), (5).Cu 82: Khi no bnh nhn c truyn trc tip dung dch glucoz (cn c gi vi bit danh huyt thanh ngt).

A. Khi bnh nhn c lng glucoz trong mu > 0,1%.

B. Khi bnh nhn c lng glucoz trong mu < 0,1%.

C. Khi bnh nhn c lng glucoz trong mu = 0,1%.

D. Khi bnh nhn c lng glucoz trong mu t 0,1% ( 0,2%.Cu 83: Phng php iu ch etanol no sau y ch dng trong phng th nghim ?

A. Ln men glucoz.

B. Thu phn dn xut etyl halogenua trong mi trng kim.

C. Cho etilen tc dng vi dung dch H2SO4 long, nng.

D. Cho hn hp etilen v hi nc qua thp cha H3PO4.Cu 84: Fructoz khng phn ng vi cht no sau y?

A. H2/Ni, to.

B. Cu(OH)2.

C. dung dch brom.

D. AgNO3/NH3.L thuyt c bn : Fructozo khng p vi dd Br2 v khng c p ln men => C Cu 85: Phn ng no sau y chng t glucoz c dng mch vng?

A. phn ng vi Cu(OH)2.

B. phn ng vi AgNO3/NH3.

C. phn ng vi H2/Ni, to.

D. phn ng vi CH3OH/HCl.L thuyt c bn => D Cu 86: Phn ng tng hp glucoz trong cy xanh cn c cung cp nng lng l 2813kJ cho mi mol glucoz to thnh.

Nu trong mt pht, mi cm2 l xanh nhn c khong 2,09J nng lng mt tri, nhng ch 10% c s dng vo phn ng tng hp glucoz. Vi mt ngy nng (t 6h00 17h00) din tch l xanh l 1m2, lng glucoz tng hp c bao nhiu?

A. 88,26g.

B. 88.32g.

C. 90,26g.

D. 90,32g.Cu 87: Cho 10kg glucoz cha 10% tp cht, ln men thnh ancol etylic. Trong qu trnh ch bin, ancol b hao ht 5%. Khi lng ancol etylic thu c bng bao nhiu?

A. 4,65kg.

B. 4,37kg.

C. 6,84kg.

D. 5,56kg.PT

Glu =>

2C2H5OH + 2CO2

180g

92 g

9kg=>4,6kg => mAncol thu c = 4,6.95% / 100% = 4,37 kg V hao ht 5%Cu 88: Ln men a g glucoz, cho ton b lng CO2 sinh ra hp th vo dung dch nc vi trong to thnh 10g kt ta. Khi lng dung dch so vi ban u gim 3,4g. Bit hiu sut ca qu trnh ln men l 90%, gi tr ca a l

A. 12.

B. 13.

C. 14.

D. 15.Cu 89: Cho 4 cht hu c X, Y, Z, T. Khi oxi ho hon ton tng cht u cho cng kt qu: C to ra 4,4g CO2 th km theo 1,8g H2O v cn mt th tch oxi va ng bng th tch CO2 thu c. T l phn t khi ca X, Y, Z, T ln lt l 6:1:3:2 v s nguyn t cacbon trong mi cht khng nhiu hn 6. Cng thc phn t ca X, Y, Z, T ln lt l

A. C6H12O6, C3H6O3, CH2O, C2H4O2. B. C6H12O6, C3H6O3, C2H4O2, CH2O.

C. C6H12O6, CH2O, C3H6O3, C2H4O2. D. C6H12O6, CH2O, C2H4O2, C3H6O3.

Cu 90: Saccaroz u tc dng c vi nhm cht no sau y ?

(1) H2/Ni, to; (2) Cu(OH)2; (3) [Ag(NH3)2]OH; (4) CH3COOH (H2SO4 c)

A. (1), (2).

B. (2), (4).

C. (2), (3).

D. (1), (4).

Cu 91: Mt cacbohirat (Z) c cc phn ng din ra theo s chuyn ho sau

Vy Z khng th l

A. glucoz.

B. saccaroz.

C. fructoz.

D. mantoz.

Cu 92: t chy hon ton 0,01 mol mt cacbohirat (X), thu c 5,28g CO2 v 1,98g H2O. Bit rng, t l khi lng H v O trong X l 0,125:1. Cng thc phn t ca X l

A. C6H12O6.

B. C12H24O12.

C. C12H22O11.

D. (C6H10O5)n.

Cu 93: Cho m g tinh bt ln men sn xut ancol etylic, ton b lng CO2 sinh ra cho qua dung dch Ca(OH)2 d, thu c 750,0g kt ta. Bit hiu sut mi giai on ln men l 80%. Gi tr m cn dng l bao nhiu ?

A. 940,0.

B. 949,2.

C. 950,5.

D. 1000,0.

Cu 94: Cho s chuyn i sau (E, Q, X, Y, Z l hp cht hu c, mi mi tn biu th mt phn ng ho hc). Cng thc ca E, Q, X, Y, Z ph hp vi s sau l

EQXYZ

A.C12H22O11C6H12O6CH3COOHCH3COOC2H5CH3COONa

B.(C6H10O5)nC6H12O6CH3CHOCH3COOHCH3COOC2H5

C.(C6H10O5)nC6H12O6CH3CHOCH3COONH4CH3COOH

D.A, B, C u sai.

Cu 95: Xenluloz trinitrat l cht d chy v n mnh, c u ch t xenluloz v axit nitric. Mun iu ch 29,70kg xenluloz trinitrat (hiu sut 90%) th th tch axit nitric 96% (D=1,52 g/ml) cn dng l bao nhiu ?

A. 14,39 lt.

B. 15,00 lt.

C. 15,39 lt.

D. 24,39 lt.

Cu 96: Chn cu ng trong cc cu sau:

A. Xenluloz v tinh bt c phn t khi nh.

B. Xenluloz c phn t khi nh hn tinh bt.

C. Xenluloz v tinh bt c phn t khi gn bng nhau.

D. Xenluloz v tinh bt u c phn t khi rt ln, nhng phn t khi ca xenluloz ln hn nhiu so vi tinh bt.

Cu 97: sn xut ancol etylic ngi ta dng nguyn liu l mn ca v v bo t g cha 50% xenluloz. Nu mun iu ch mt tn ancol etylic, hiu sut qu trnh l 70% th khi lng nguyn liu xp x

A. 5031kg.

B. 5000kg.

C. 5100kg.

D. 6200kg.

Cu 98: Chn pht biu sai:

A. C th phn bit mantoz v ng nho bng v gic.

B. Tinh bt v xenluloz khng th hin tnh kh v trong phn t khng c nhm chc anehit (CH=O).

C. Tinh bt c phn ng mu vi iot do tinh bt c cu to mch dng xon c l rng.

D. C th phn bit glucoz v saccaroz bng phn ng vi Cu(OH)2/OH-, to.

Cu 99: Cho xenluloz phn ng vi anhirit axetic (xc tc H2SO4 c), thu c 11,1g hn hp X gm xenluloz triaxetat, xenluloz iaxetat v 6,6g CH3COOH. Thnh phn % theo khi lng ca xenluloz triaxetat v xenluloz iaxetat trong X ln lt l

A. 77% v 23%.

B. 77,84% v 22,16%.

C. 76,84% v 23,16%.

D. 70% v 30%.

Cu 100: Ln men 1 tn tinh bt cha 5% tp cht tr thnh ancol etylic, hiu sut ca mi qu trnh ln men l 85%. Khi lng ancol thu c l

A. 400kg.

B. 398,8kg.

C. 389,8kg.

D. 390kg.

Cu 101: Pha long 389,8kg ancol etylic thnh ancol 40o, bit khi lng ring ca ancol etylic l 0,8 g/cm3. Th tch dung dch ancol thu c l

A. 1206,25 lt.

B. 1246,25 lt.

C. 1218,125 lt.

D. tt c u sai.

Cu 102: Kh cacbonic chim t l 0,03% th tch khng kh. Mun to ra 500g tinh bt th cn bao nhiu lt khng kh (ktc) cung cp lng CO2 cho phn ng quang hp? Gi thit hiu sut qu trnh l 100%

A. 1382666,7 lt.

B. 1382600 lt.

C. 1402666,7 lt.

D. tt c u sai.

Cu 103: t chy hon ton 0,0855g mt cacbohirat X. Sn phm c dn vo nc vi trong thu c 0,1g kt ta v dung dch A, ng thi khi lng dung dch tng 0,0815g. un nng dung dch A li c 0,1g kt ta na. Bit khi lm bay hi 0,4104g X thu c th tch kh ng bng th tch 0,0552g hn hp hi ancol etylic v axit fomic o trong cng iu kin. Cng thc phn t ca X l

A. C12H22O11.

B. C6H12O6.

C. (C6H10O5)n.

D. C18H36O18.

CHUYN 8: CACBOHIDRAT

1 C2 D3 A4 B5 A6 B7 A8 B9 A10 B

11 C12 A13 C14 B15 A16 A17 A18 B19 A20 A

21 D22 C23 B24 A25 B26 D27 B28 A29 A30 C

31 B32 B33 A34 B35 C36 D37 C38 C39 A40 C

41 B42 D43 B44 C45 A46 A47 A48 B49 D50 B

51 C52 D53 A54 B55 C56 D57 B58 B59 D60 C

61 B62 A63 A64 B65 C66 C67 A68 B69 C70 D

71 C72 C73 B74 D75 A76 C77 A78 C79 B80 B

81 D82 C83 B84 B85 C86 D87 A88 B89 D90 C

91 B92 B93 C94 B95 B96 A97 D98 A99 A100 B

101 C102 C103 A104 A105 106 107 108 109 110

p n khng phi ng 100% u nh c th 1 s p n sai

Bn c cho kin v cu . Mnh v mt s ngi s xem li.

Cm n bn gip .

Chc bn thnh cng.

Do thi gian gp rt v trnh bn thn cn nhiu hn ch, mi cu hi mnh gii theo phng n ca kin c nhn cho l nhanh v d hiu nht, ng thi c nhng phn tch v nh gi v cc cu.Xin lu ngoi nhng phng php gii nh trnh by trn, vn cn c nhng phng n gii c th sai hoc cha gn => Chnh v th bi vit ch mang tnh cht minh ha, hng dn, trn c s gip cc bn c ci nhn chuyn su v cc phng php v c th p dng cho cc bi ton tng t t rn luyn mnh.Mt khc, kin thc Ha hc rt rng nn cc phng php gii trn c th p dng nhiu cho cc bi tp tng t do vy bn cn lm vng kin thc gii quyt cc yu cu t ra ca bi thi.Bn cnh cc phng php gii s gip hc cch tnh nhm, nhanh, mo v to kinh nghim i thi cc cng thc mo gip bn hon thnh thi vi kt ta tt.

Hi vng bi vit ny s p ng c s k vng ca cc bn c

Rt mong nhn c cc kin phn hi ca bn, gio vin mnh c th hon thin tt gio n ny. n c th tr thnh ti liu hc tp cho cc bn . Cng nh chun b hnh trang bc vo cng trng H C l mt bc m tin ti thnh cng sau ny.

Mi kin phn hi xin gi v a ch : Hieu_100293@yahoo.comChc cc bn hc sinh thi tt, chc cc thy c gio dy tt !!

Thn tng bn.Hiu

Thay i l quy lut sng. Nhng ai ch vit nhn vo qu kh v hin tri chc chn s nh mt tng lai.

Hu ht mi ngi b cuc khi thnh cng ti rt gn.

H b cuc khi ch cn cch ch mt mt.

H b cuc ngay khi cuc chi ch cn li mt pht, khi d chm c mt tay vo chin thng.Mi ngi bo ti l ngi cu ton, nhng iu khng chnh xc. Ti ch l ngi lun tm kim s hon thin. Ti lun lm mt vic g cho ti khi hon thnh xong, ri sau , ti li chuyn sang vic khc.Bn c ban cho i chn mi ln bn mc li khi bc chn tri ln, chn phi s a bn li ng ng.

dung dch xanh lam

kt ta gch

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