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SULIT

The rate of reaction between calcium carbonate and excess hydrochloric acid isstudied by collecting the carbon dioxide gas.Diagram 2l shows the resuits in a gtaph.Katlar tindak balas antqrq kalsiurn karbonat dan asid hidrokbrik berlebihan dikaji dengan mengumpulkangas karbon dioksida.Rajah 21 menunjukkan keputusan dalam bennk graf.

Total voh:qeofcarbondioxide (cm3 )Julrildhisipadukarbondiobida (cmr)

0123456Ti.me (run),l/asa (mtn)

DiagramZlRajah2l

How tnirch time is required for half of the calcilun carbonate to react?Ilerapakah nasayang diperlukan untuk separuh knlsiwn kqrbonat bertindak balus'l

A 0.50 min

B 0,95 min

C I.40 min

D 2.00 min

46 The follorving thermochemical equation represents the displacement of silvcr by zinc,Persanaan tertnokirnia beriktu mewakili penyesoran argentum olelt zink.

Zn+2AgNOg + Zn1NO1)2 t'2Ag

What is the nrass of zinc required to reiease 60.0 kJ of heat?

I Relative atomic mass: Zn:65]lpukuli .lisim zink yang dipetlukan unhrk me mbi:ba,vkan 60.0 kI haba?

lJisinr utom relald: Zn= 65J

A 6.0g

R]O"'' E

i0.8 g

18.0g

23

B

C

D

45rl1 I 1^-')( ) i 2 llal< Cipta lv{ajlis :Unanah ilak; at" t\42\IlA

454,/7

AH: -360 ki

SULTT 24 454U1

47 Diagram 22 shows the structure of two types of mbber J and K.Rajah2T menunjukkan strnktur tlua jenis getohl danK.

Goa, coc -

- -------r

g+Cg*O ^---.-g*G

c=c

- Geo

Rubber J

Getah I

-+.'" \--tl.I *g,

16-'\6 -t\ -------cVina

,/ \-/-----o-

A

B

C

D

Diagram22Rajah22

Which of the following are the correct properties for rubber J and K?Manakah antara berikut adqlah sifut yang betut bagi getah t danK?

Rubber JGetah J

Rubber KGelohK

More elasticLebih kenyal

Less elasticKurans kenvol

Strong and hardKuat dan keras

Weak and softLemah dan lembut

High melting pointl'akat lebur tinpsi

Low melting pointTakat lebur rendah

Easy to oxidizeMudah teroksida

Difficult to oxidizeSuksr terolaidq

The following equation represents the reaction between potassium hydroxide andpotassium dichromate(VI).Persamaan berikut mauakili tindak balas antara kalium hidrokida dan kaliwn dilrorna{yl).

K:CrzOz + 2 KOH ---+ ?K2CrOa + HzOPotassium dichrornate(VI)

Kaltutm dih'onat(YI)

Rubber KGetahK

Potassir.rm cluomate(Vl)Kaliwn kromat(Yl)

48

s9tc/

@t

EYsr-/8/ra/ ,lt

gfls/ fir/

iiE/ llo-/ ri

.:/ i

at

=Vs/</o/b/siWhat happeus to the oxidation number of chromium and pH of the reaction mixture

when aqueous potassium dichromate(Vl) is added to aqueous potassium hydroxide? -SApukah yang berlaku kepada nombor pangoksiduun kramium dan pH cqmpuran tindak balas apabilo 3/kalium dikronrnl(Vl) akueus ditan*ah kepada kulium hiclroksids akueus2 S

C)xidation number of the chromiunrt\ o tn b o r p en so ksl da art k r oni uttt

pH of the mixturepH cumnurun

Remains the sanreKekal sama

DecreasesBerkurans

Remains the sameKekal sama

IncreasesBerlambah

I)ecreasesBerkurang

DecreasesBerkurang

DecreasesBerkurcmp

IncteasesBertambalr

oci$tt/-:!=

5/A I nemains tha;i Slfi

B I Remains the sanre I IncreAseq I €,-t,i/\i

C

L- Berkut:ons I -B;;i';;;;; I FDt- ESq)

9)\*

I4541/1 o2012 Hak Cipta Ivlajlis Amanah Rakyat, IV{AR \ pihat halan. Sasebetaho siit,ITq)

q)\t

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j

i

tlll

tl

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1(n)(1)

SULiT 2

Section ABahagian A

[60 marlrs)160 murkahl

y:t;::):::::;:x):iilT:;:;,::'ii

Diagram 1 shows the apparatus set-up used to determine thesubstance X.Substance X is a white solid and an electrical insulator.Rajoh I nenunjukkan susunail radas bagi menentukan takat lebur bahanX.BahanX adalah pepejal putih dan penebat elektrik.

4541t2

melting point of

lt,ll nt

(o€q)

-\<qa9)

[See \- t pnge

coNFI' .e {Tl,\t,a(Da.o

q)o

<(

(a)

Water.tirSubets$seXBalptX,

Diagram 1

Rajah 1

Substance X melts at 61oC.BqhanX melebur pacla 670C.

(i) Draw the alrangement of particles of substance X at 50 0C,

Lttkiskan susuhdn zarah bahan X pada 5 0 oC,

o/o/cl

SY*'ro/o,/o/

s/rsilr/l+/t

s/r

o/olatl

x\/.s/o/o/o/

6t!€/rl;/ //t Ii/

Heat

4541/2 @ Copyright Rcservtrd l\IAtLA

STII,IT 4s4u2

(iiD Drarv the electron alrangement of the compound in (c)(ii).Lukiskan gambar rajah susunan elehron bagi sebatian dalaru (c)(ii).

[2 marks]p markah)

(d)

(e)

Chiorine is more electronegative than aluminium. Explain.Klorin lebi h elektronegat if daripada alwninium. Terangkan.

fi marlc)

fi markahl

Explain rvhy Argon, Ar exists as a monoatomic gas?

Terangkan tnengcpa Argon, At tvujttd sebagai gas monoalom?

.c/ot/2tsl

JJ/o/.a/or

F/.:7l/s/

12 marksl12 markalf

(E

tso.r<

U)c,ou\

[See g . pa8e

CONFIT ^o rTIAL,t'a.g

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o/olc/

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€llJ/o/CJ/

s/6tFi+/i/s/

-o/:Jo)l

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c,

3lt/+7i/i/

fl

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