S GIO DC & O TO
PAGE
S GIO DC & O TO
H NI
CHNH THCK THI HC SINH GII THNH PH - LP 9
Nm hc 2014-2015
Mn thi: Ha hc
Ngy thi: 09-4-2015
Thi gian lm bi: 150 pht
Cu I (2,75 im)
1/ Khi un nng mt bnh cha nc my, cc bt kh nh c hnh thnh v ni ln
rt nhanh trc khi nc si. Tip tc cho nc si hon ton, sau ngui. Khi nc
c un nng tr li, cc bt kh nh khng xut hin na. Gii thch hin tng.
2/ Cho hp cht X c cng thc AB2, mi phn t c tng s ht proton l 18,
X tha mn cc phng trnh ha hc sau: X + O2 (d) Y + Z ; X + Y A + Z; X
+ Cl2 A + HCl
a) Xc nh cng thc cht X v hon thnh cc phng trnh ha hc minh
ha.
b) Khi cho cht Y ln lt tc dng vi cc dung dch: nc brom, KMnO4,
KOH ( thu c dung dch va c phn ng vi BaCl2, va c phn ng vi NaOH).
Vit cc phng trnh ha hc xy ra.
Cu II (3,0 im)
1/ Rau sng l mn n a thch trong ba n ca nhiu gia nh. Trc khi n
rau sng, ngi ta thng ngm chng trong dung dch nc mui n (NaCl) trong
thi gian t 10 15 pht st trng.
Gii thch kh nng st trng ca dung dch mui n. V sao cn khong thi
gian ngm rau sng nh vy?
2/ Hn hp X gm Fe(NO3)3, Cu(NO3)2, AgNO3. Hm lng ca nguyn t nit
trong hn hp X l 11,864%.
a) T 21,24 gam hn hp X c th iu ch c ti a bao nhiu gam hn hp ba
kim loi Fe,Cu, Ag.
b) em ton b lng hn hp kim loi thu c tc dng ht vi dung dch H2SO4
c, nng d, sau phn ng c V lt SO2 (ktc) l sn phm kh duy nht. Tnh gi
tr ca V.
Cu III (6,0 im)
1/ Ha tan hon ton hn hp gm nhm clorua v nhm sunfat vo nc thu c
200 gam dung dch X, chia dung dch X lm 2 phn: Phn 1 em tc dng vi
dung dch BaCl2 d thu c 13,98 gam kt ta trng. Phn 2 em tc dng vi
476ml dung dch Ba(OH)2 1M, sau khi phn ng xong thu c 69,024 gam kt
ta. Bit khi lng phn 2 gp n ln khi lng phn 1 ( n: nguyn) v lng cht
tan trong phn 2 nhiu hn trong phn 1 l 32,535 gam. Tnh nng C% ca cc
cht tan c trong dung dch X.
2/ Trn dung dch X ch cha a mol NaHCO3 vi dung dch Y ch cha b mol
Ba(OH)2 thu c cht kt ta v dung dch Z.
a) Xc nh thnh phn cht tan c trong dung dch Z ( bit b < a <
2b ).
b) em 200ml dung dch Z( cha 1,86 gam cht tan) tc dng vi 200ml
dung dch Ca(HCO3)2 0,2M thu c 3 gam cht kt ta v dung dch cha m gam
cht tan. Tnh nng mol /lt ca mi cht tan trong dung dch Z v tm gi tr
ca m.
Cu IV(3,75 im)
1/ Trong cuc sng, ngoi vic s dng cn lm nhin liu, cn c th dng n
st trng hoc ra cc vt thng v cn c tc dng dit khun. Thc t ngi ta thng
dng cn 750 st trng l tt nht m khng dng cn 900 hoc 960. Gii thch kh
nng dit khun ca cn 750, ti sao khng dng cn 900 hay 960.
2/ Hn hp X gm hai hidrocacbon c cng s nguyn t cacbon ( c s mol
bng nhau v c s nguyn t cacbon 4). t chy hon ton V lt hn hp X (ktc)
bng lng oxi d ri cho sn phm chy vo bnh ng dung dch Ca(OH)2 d, thy
khi lng bnh tng 5,14 gam, lc b kt ta, sau th nghim thy khi lng dung
dch trong bnh ng Ca(OH)2 gim 2,86 gam so vi trc phn ng.
a) Xc nh cng thc phn t ca mi hidrocacbon trong hn hp X v tm gi
tr ca V.
b) Trn 2 lt hn hp X vi 10,5 lt hn kh Y gm C4H8, C4H6, H2, C4H4
thu c hn hp kh Z. em nung nng hn hp kh Z vi xc tc Ni, sau khi cc
phn ng xy ra hon ton thu c 5 lt mt cht kh duy nht (cc th tch kh o
ktc). Tnh t khi hi ca hn hp Y so vi H2.
Cu V(4,5 im)
1/ Hn hp A gm etilen v axetilen. Khi lng ca 1 lt hn hp A l
1,1905. Khi cho 6,72 lt hn hp A li qua 1,5 lt dung dch Br2 0,2M;
sau khi phn ng xong thy dung dch Br2 mt mu hon ton; khi lng bnh ng
dung dch brom tng 5,88 gam v c 1,792 lt hn hp kh B thot ra khi bnh.
Cc th tch kh o ktc.
a) Tnh khi lng mi sn phm thu c.
b) Tnh thnh phn phn trm theo th tch ca mi kh trong hn hp B.
2/ t chy hon ton x(gam) hn hp gm hai ru c cng thc tng qut
CnH2n+1OH v CmH2m+1OH thu c a gam CO2 v b gam H2O.
a) Tm biu thc lin h gia x, a, b.
b) Nu bit a = 24,64 gam, b = 13,68 gam v 2 ru ban u c khi lng
mol phn t hn km nhau 14 gam. Tm cng thc phn t v tnh thnh phn phn
trm theo khi lng ca mi ru c trong hn hp ban u.
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