Marking Sbp Mid Year 08

8/13/2019 Marking Sbp Mid Year 08

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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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3/21

'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

9


4/21

(ii)

b (i)

(ii)

(iii)

c (i)

(ii)

d

( ;tract &r m ) air

:eutraliertili


5/21

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

7


6/21

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


7/21

" & 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

E


8/21

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

!


9/21

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

20

I


10/21

'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


11/21

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


12/21

6i

6ii

Bacteria -ill pr duce lactic acid/H # i ns -hich neutrali


13/21

$ 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


19


14/21

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


15/21

1

30

35

40

45

50

0.015 0.020 0.025 0.030X

X

X

X

X

emperature / C

1/time ' s 01


16/21

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


17/21

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


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


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


1E


18/21

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


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!


19/21

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


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


1I


20/21

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


#"- %+ MA&$I"! SC #M#

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Marking Sbp Mid Year 08