Page 179 - MODUL KIMIA A+XPLOSIVE SPM (LATEST)

SPM Chemistry A xplosive Module (Chemistry A Ticket For “U”) ANSWERS
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SECTION C
NO MARK SCHEME MARKS
9 (a) Zn (s / p) + 2HCl (aq / ak)  ZnCl 2 (aq / ak) + H 2 (g / g)

P1 - Correct formula for all reactants and products
Formula kimia untuk semua bahan tindak balas dan hasil tindak
balas
P2 - Equation is balanced / Persamaan seimbang
P3 - No. of moles of HCl / Bilangan mol HCl
= (0.2 x 25) / 1000
= 0.005 mol
Mol ratio / Nisbah mol between HCl : H 2
= 2 : 1
= 0.005 : 0.0025
P4 - Maximum volume of H 2 / Isi padu maksimum H 2
= 0.0025 x 24
3
= 0.06 dm
3
= 60 cm 4
(b)(i) Set I and set II / Set I dan set II
Rate of reaction for set I / Kadar tindak balas untuk set I
= 50/90
3 -1
= 0.56 cm s
Rate of reaction for set II / Kadar tindak balas untuk set II
= 50/55
3 -1
= 0.91 cm s
P1 - Calculation for overall rate of reaction for both set I and set II
Penghitungan untuk kadar tindak balas keseluruhan bagi
kedua – dua set I dan set II.

In set II / Dalam set II,
P2 - Rate of reaction is higher.
Kadar tindak balas lebih tinggi.
P3 - Concentration of HCl is higher.
Kepekatan HCl lebih tinggi.
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P4 - Number of H ion per unit volume is higher.
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Bilangan ion H per unit isi padu lebih tinggi.
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P5 - Frequency of collisions between H ion and Zn are higher.
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Frekuensi perlanggaran di antara ion H dan Zn lebih tinggi.
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P6 - Frequency of effective collisions between H ion and Zn are
higher.
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Frekuensi perlanggaran berkesan di antara ion H dan Zn
lebih tinggi.

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