marking sbp mid year 08
TRANSCRIPT
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SULIT 4541/1/2/34541ChemistryMarking SchemeMei
2008
BA A!IA" S#$%LA$#M#"T#&IA" '#LA(A&A" MALA)SIA
********************************************** '#'#&I$SAA" '#&T#"!A A" TA U" 2008
+%&M 5 C #MIST&)
MA&$I"! SC #M# +%& 'A'#& 1, 2 A"- 'A'#& 3
Peraturan pemarkahan ini mengandungi halaman bercetak.
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'A'#& 1
1 B 21 D 41 D2 C 22 D 42 B
3 B 23 B 43 D4 C 24 A 44 C5 D 25 C 45 B. A 2. A 4. A
B 2 D 4 B8 A 28 A 48 D
D 2 C 4 C10 D 30 A 50 B11 D 31 A12 C 32 B
13 A 33 D14 A 34 A15 C 35 C1. B 3. A1 C 3 D18 C 38 B1 C 3 B20 C 40 D
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'A'#& 2 S#CTI%" A
" & ric Mark
1 a
b (i)
(ii)
c
d
e (i)
(ii)
(iii)
GHas stable / ctet electr n arrangement//! "alence electr n
2A # 2H 2$ 2A$H # H 2
%se a small pieces//use a & rcep// use a g gle
G' 'D' A' '*
Has same "alence electr n// "alence electr n is 1
D 2 r + 2D
,can dra- the diagram & electr n arrangement c rrectl
0 C rrect structure & at ms
0 C rrect rati & at ms 1+2
Has (neutral ) m leculeT%TAL
11
1
1
1
1
1
2
1
102 a
b(i)
(ii)
c
d
e (i)
(ii)
(iii)
1
P3+ s lid # li4uid
56+ li4uid
Heat energ abs rbed
is used t "erc me the & rces & attracti n bet-een particles
// Heat is abs rbed t "erc me the interm lecular & rces
r+ i n/at m
(1#1)
he particles / m lecules m "e &aster
7 dine/7 2//napthalene/C 18H !
C pper/ Cu
7 n
Di&&usi n
T%TAL
1
1
1
1
1
1
1
1
1
1
103 a (i) 9H 2 # : 2 2:H 9 1
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(ii)
b (i)
(ii)
(iii)
c (i)
(ii)
d
( ;tract &r m ) air
:eutraliertili
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c (i) (ii)
d
(An de )+Cu Cu 2# # 2e
(Cath de )+ Cu 2# # 2e Cu
lectr plating & metals/ ;tracti n & reacti"e metals
T%TAL
1
1
1
10
5 a
b
c 6i
6ii
9
2H 2$ 2 $ 2 # 2H 2$
:umber & m le & H 2$ 2 28 ; 2/1888 8.8=
2 m l & H 2$ 2 pr duce 1 m l & $ 2 //
:umber & m le & $ 2 8.8=/2 8.82
@ lume' $ 2 8.2 ; 2=dm 9 =.! dm 9
5ate & reacti n in e;periment 77 is higher than e;periment 7
he c ncentrati n/number & m lecule per unit " lume &
h dr gen per ;ide in 77 is higher
he &re4uenc & c llisi n bet-een H 2$ 2 m lecule is higher
he &re4uenc & e&&ecti"e c llisi n is higher
@ lume & gas/cm 9
ime(s)
*abel a;es and a;esC rrect cur"e and label 7 and 77
T%TAL
1
1
1
1
1
1
1
1
11
10
. a A c mp und that c ntain element & carb n and deri"e &r m li"ing
rganisms.
1
77
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6i
6ii
6iii
c 6i
6ii
6iii
9 6i
6ii
6iii
C2H=
ethene
d uble b nd bet-een carb n at ms
(a+ C C )
Acidi&ied p tassium manganat (@77) // Acidi&ied p tassium
dicr mate (@7)
$;idati n
Purple t c l urless // range t green
C2H= # H 2$ C2H $H
Alc h l
emperature 988 C // Pressure 8 atm sphere // c ncentrated
ph sph ric acid
T%TAL
1
1
1
1
1
1
1
1
1
10
S#CTI%" B
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" & ric Mark
a 6i
6ii
6ii
C mp und that & rm -hen n n metal at m gain/recei"e/accept
electr n that release/l se/d nate b metal at m t achie"e stable
/ ctet/duplet electr n arrangemen
C mp und that & rm bet-een n n metal at m b sharing their
"alence electr n t achie"e stable/ ctet /duplet electr n
arrangement
Bet-een P and 3
At m has 1 "alence electr n
At m l ses/d nates/trans&ers 1 electr ns t & rm # i n //
# # e0 and attain stable ctet electr n arrangement
At m has E "alence electr ns At m gains/recei"es/accept 1 electr n t & rm 0i n//
# e0 0
attain the stable / ctet electr n arrangement
he t- pp sitel 0charged i ns// the # and 0 i n are
b nded t gether b a str ng electr static & rce
& rm a i nic c mp und -ith the & rmula //
diagramn
Fa; E
Bet-een and
At m has = "alence electr ns and at m has 1 "alence
electr ns
$ne at m c ntributes = electr ns and (each) at m
c ntributes ne electr n & r sharing .
At m shared = pairs & electr n -ith = at ms
t attain a ctet /stable electr n arrangement respecti"el
1
1
1
1
11
1
11
1
1
111
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8 a
c6i
mpirical & rmula0 + rm :a sh -s simplest rati & at ms & each
element in the c mp und
F lecular & rmula0 + rm :a sh -s actual number & at ms &
each element in the c mp und
F lecular > rmula ( mpirical & rmula )n ( CH 2 )n
5elati"e F lecular Fass ( CH 2 )n E8 12n # 2n E8
1=n E8 n
F lecular > rmula C H18
1. Fetal is cleaned using sand paper
2. A crucible and its lid are -eighed and the mass is rec ded
9. Fetal is palced in the crucible. he crucible'lid and its
c ntent is -eighed and the mass is rec rded.
=. he crucible -ith its c ntent is heated str ng:y -ith ut
lid.
. hen metal start burn' the crucible is c "ered b its
lid
. the c "ered is raise a little at inter"als
E. hen there is n m re reacti n' the lid is rem "ed and the
crucible is heated str ngl & r a &e- minutes.
!. C l the crucible and -eigh the crucible'its lid and its
C ntent and rec rd the mass.
I. he pr cess & heating' c ling and -eighing is repeated
until c nstant is btained.
18. (Precauti n step )J
Cl se the crucible immediatel t pre"ent l ss &
1
1
1
11
11
1
1
1
1
1
1
1
1
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lement $
Fass(g) 1.98 8.92
m l 1.98/ 8.82 8.92/1 8.82
6implestrati
1 1
mpirical > rmula $
$ A*
1
1
1
1
1
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'A'#&2 ;S#CTI%" C
" 5ubric Mark
a
6i
6ii
c6i
6ample ans-er +
n # H:$ 9 n(:$ 9)2 # H 2$
nC$ 9 # H:$ 9 n(:$ 9)2 # H 2$ # C$ 2
n$ # H:$ 9 n(:$ 9)2 # H 2$
An t-
Fethan ic acid partial i ni
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6ii
9
nC$ 9 # H 26$ = n6$ = # H 2$ # C$ 2
:umber & m le ' H 26$ = 8.1( 188 )/1888
8.81
1 m l & H 26$ = pr duce 1 m l & n6$ =
F le & n6$ = 8.81
Fass & n6$ = 8.81 1 1
1 .1 g
6ample ans-er +
1 amm nium chl ride as a &ertili
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6i
6ii
Bacteria -ill pr duce lactic acid/H # i ns -hich neutrali
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$ A*PAP 5 9
1 (a) KK8 89 ? Feasuring and using numbers
P*A:A 7$: 6C$5[Able to write all the times with units accurately]6uggested ans-er+
t 1 .8 s' t 2 48.0 s , t 3 42.0 s , t 4 37.0 s , t 5 33.0 s
9
[Able to record all the times accurately but without units no decimal !lace]t1 .8 ' t 2 =!.8 ' t 9 =2.8 ' t = 9E.8 ' t 99.8 //// t 1 s ' t 2 =!.8 s ' t 9 =2 s' t = 9Es' t 99s
2
[Able to write at least 3 readin"s o# the times accurately] 1
$o res!onse "i%en wron" res!onse 8
1 (b) KK8 810 $bser"ati nP*A:A 7$: 6C$5
[Able to state the colour o# sul!hur and the rate o# it is #ormed]6uggested ans-er+
Pale / light ell - precipitate is sl -l & rmed
9
[Able to state the colour o# sul!hur]
Pale / light ell - precipitate is & rmed.
2
[Able to state the #ormation o# !reci!itate]A precipitate is & rmed.
1
$o res !onse "i%en wron" res!onse 8
1 (c) KK8 8 ? C mmunicatingP*A:A 7$: 6C$5
[Able to construct a table correctly containin" three labeled columns withcorrect units and record all the time and 1 time accurately ]
6uggested ans-er+
emperature' C
98 9 =8 = 8
ime ' s .8 =!.8 =2.8 9E.8 99.81 / time ' s 01 8.81! 8.821 8.82= 8.82E 8.898
9
[Able to construct a table correctly containin" three labeled columns withcorrect units and record all the time and 1 time but not accurately]
2
[Able to write at least 3 readin"s o# the times accurately] 1
$o res!onse "i%en wron" res!onse 8
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1 (d) (i) KK8 8 C mmunicatingP*A:A 7$: 6C$5
[Able to draw a "ra!h accurately that consists o# the #ollowin" as!ects]6uggested ans-er+
1. B th a;es labeled and units( a;is 0 temperature ' a;is ? 1/ time )
2. All p ints trans&erred c rrectl9. %ni& rm scale' graph si
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1
30
35
40
45
50
0.015 0.020 0.025 0.030X
X
X
X
X
emperature / C
1/time ' s 01
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1(e) KK8 18 0 6tate "ariables
P*A:A 7$: 6C$5[Able to state three %ariables and three action to be ta&en]6uggested ans-er+
@ariable Acti n t be takenFanipulated+emperature
Heat the s dium thi sulphates luti n at di&&erent temperature //%se di&&erent temperature.
5esp nding+5ate & reacti n / time taken & r L Mmarks t disappear &r m "ie-.
5ec rd the time taken & r L M markt disappear &r m "ie-.
C ntr lled +C ncentrati n and " lume & H 26$ ='c ncentrati n and " lume & s diumthi sulphate s luti n' si
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2(b) KK 8 8 0 Predicting
P*A:A 7$: 6C$5[Able to state the %olta"e %alue]8. @
9
8. 9 ? 8. = @ // 8. ? 8. E @ 2N 8. = @ // O 8. E @ 1
$o res!onse "i%en wron" res!onse 8
2(c)KK 8 8! ? 7nterpreting DataP*A:A 7$: 6C$5
[Able to arran"e the !osition o# all metals in an ascending order based ontendency to release electrons correctly]C pper O *ead O 7r n O inc O Fagnesium
9
[Able to arran"e the !osition o# all metals in descending order based ontendency to release electrons]Fagnesium O inc O 7r n O *ead O c pper
2
[Able to arran"e the !osition o# at least #our metals in ascendin" order basedon tendency to release electrons correctly]
1
$o res!onse "i%en wron" res!onse 8
2(d) KK8 8I ? $perati nal de&initi nP*A:A 7$: 6C$5
[Able to state the correct and com!lete o!erational de#inition]6uggested ans-er+
he &urther the metal is =r m c >>er in the electr chemical series' the greateris their " ltage reading. //
9
[Able to "i%e incom!lete relationshi!]6uggested ans-er+
he &urther apart the metal is in the electr chemical series' the greater the p tential di&&erence / " ltage reading.
2
[Able to state an idea]6uggested ans-er+
he p siti n & metal in&luence the " ltage reading //pe & metal in&luence the " ltage reading.
1
$o res!onse "i%en wron" res!onse 8
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9.(a) KK8 1821 ? 6tatement & pr blem
P*A:A 7$: 6C$5[Able to ma&e a suitable statement o# !roblem]6uggested ans-er+
H - t di&&erentiate bet-een magnesium nitrate s luti n and calcium nitrates luti n // H - t di&&erentiate bet-een magnesium i n and calcium i n
9
[Able to ma&e a suitable aim]6uggested ans-er+
di&&erentiate the presence & magnesium i n and calcium i n b usinga4ue us amm nia s luti n.
2
[Able to state an idea o# statement o# !roblem or aim] 1
$o res!onse "i%en wron" res!onse 8 9(b) KK8 1282 ? 6tating h p thesis
P*A:A 7$: 6C$5[Able to state the relationshi! between mani!ulated %ariable and res!ondin"%ariable correctly]6uggested ans-er+
7& the additi n & a4ue us amm nia s luti n & rms -hite precipitate -hich isins luble in e;cess amm nia a4ue us s luti n' then the s luti n tested ismagnesium nitrate. // 7& a4ue us amm nia s luti n is added and n changeccur then the s luti n tested is calcium nitrate.
9
[Able to state the relationshi! between mani!ulated %ariable and res!ondin"%ariable]
2
[Able to state an idea o# the hy!othesis] 1
$o res!onse "i%en wron" res!onse 8
9 (c) KK8 1282 ? 6tating "ariables
P*A:A 7$: 6C$5[Able to state all the three %ariables correctly]6uggested ans-er+
Fanipulated "ariable + magnesium nitrate and calcium nitrate // Fg 2# and Ca 2#
5esp nding "ariable+ & rmati n & -hite precipitateC ntr lled "ariable + a4ue us amm nia s luti n[Able to state any two o# the %ariables correctly]
[Able to state one o# the %ariables correctly or state idea re"ardin" %ariable]
$o res!onse "i%en wron" res!onse
1!
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9(d) KK8 128 ? *ist & substances and apparatus
P*A:A 7$: 6C$5[Able to state the list o# substances and a!!aratus correctly and com!letely]6uggested ans-er+
est tube' dr pper' test tube rack8. m l dm 09 magnesium nitrate s luti n' 8. m l dm 09 calcium nitrate s luti n'a4ue us amm nia s luti n.
9
[Able to state the list o# substances and a!!aratus correctly but notcom!letely]6uggested ans-er+
est tube8. m l dm 09 magnesium nitrate s luti n' 8. m l dm 09 calcium nitrate s luti n'a4ue us amm nia s luti n.
2
[Able to state an idea about the list o# substances and a!!aratus]6uggested ans-er+
est tubemagnesium nitrate' calcium nitrate
1
$o res!onse "i%en wron" res!onse 8
9(e) KK8 128= ? echni4ue /Precedure
P*A:A 7$: 6C$5[Able to state a com!lete e(!erimental !rocedure]6uggested ans-er+
1. 2 cm 9 & s luti n A is p ured int a test tube.2. A &e- dr ps & a4ue us amm nia s luti n are added int the test tube
using a dr pper and the test tube is shaken -ell.9. 7& the precipitate is & rmed' a4ue us amm nia s luti n is added
c ntinu usl until n &urther change ccurred / until e;cess=. he mi;ture is shaken -ell.
. he changes ccur is rec rded in a table.
. 6teps 1 t = are repeated using s luti n B.
9
[Able to state a com!lete e(!erimental !rocedure]1'2'9'='
2
[Able to state a com!lete e(!erimental !rocedure]1'2'9'
1
$o res!onse "i%en wron" res!onse 8
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9(&) abulati n & data
P*A:A 7$: 6C$5[Able to e(hibit the tabulation o# data correctly ]
5eagent $bser"ati nest tube/6 luti n A est tube/6 luti n B
A4ue usamm nia s luti n 9
[Able to e(hibit the tabulation o# data less accurately ]
5eagent est tube /6 luti n A est tube/6 luti n BA4ue usamm nia s luti n
2
[Able state an idea about the tabulation o# data] 1
$o res!onse "i%en wron" res!onse 8
#"- %+ MA&$I"! SC #M#
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