MARA Junior Science College- Chemistry SPM 2012 Trials

8/14/2019 MARA Junior Science College- Chemistry SPM 2012 Trials

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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)

DiagramZlRajah2lHow tnirch time is required for half of the calcilun carbonate to react?Ilerapakah nasayang diperlukan untuk separuh knlsiwn kqrbonat bertindak balus'lA 0.50 minB 0,95 minC I.40 minD 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= 65JA 6.0g

R]O'' Ei0.8 g18.0g

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BCD

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

454,/7

AH: -360 ki



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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

-- -------rg+C g*O ^---.-g*Gc=c - GeoRubber J

Getah I

-+.'" \--tl.I *g,16-'\6 -t\ -------cVia,/ \-/-----o-

ABCD

Diagram22Rajah22Which 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 KGelohKMore elasticLebih kenyal Less elasticKurans kenvolStrong and hardKuat dan keras Weak and softLemah dan lembutHigh melting pointl'akat lebur tinpsi Low melting pointTakat lebur rendah

Easy to oxidizeMudah teroksida Difficult to oxidizeSuksr terolaidqThe 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/@tEYsr-/8/ra/ ,ltgfls/ fir/ iiE/ llo-/ ri.:/ iat

=Vs/


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MARA Junior Science College- Chemistry SPM 2012 Trials

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