Page 210 - MODUL KIMIA A+XPLOSIVE SPM (LATEST)

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SPM Chemistry A xplosive Module (Chemistry A Ticket For “U”) ANSWERS

SECTION C
NO MARK SCHEME MARKS
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2+
9(a)(i) Cu (s / p) + 2Ag (aq / ak)  Cu (aq / ak) + 2Ag (s / p)
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 - Number of mol for AgNO 3 / Bilangan mol AgNO 3
= 0.2 x 200 / 1000
= 0.04 mol
P4 - Heat change / Perubahan haba
= 200 x 4.2 x (36 – 28)
= 6720 J
= 6.72 kJ
P5 - Heat of displacement / Haba penyesaran
= 6.72 / 0.04
-1
= – 168 kJ mol

2m – Operational definition / Definisi secara operasi

Heat change when 1 mol of silver is displaced from silver nitrate solution by
copper.
Perubahan haba apabila 1 mol argentum disesarkan dari larutan argentum
nitrat oleh kuprum.
1m – general definition / Definisi umum

Heat change when 1 mol of metal is displaced from its solution by a more
electropositive metal.
Perubahan haba apabila 1 mol logam disesarkan dari larutan logamnya
oleh logam yang lebih elektropositif.
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(ii) P1 – New heat of displacement is higher than – 168 kJ mol
-1
Haba penyesaran baru lebih tinggi daripada – 168 kJ mol
P2 – Magnesium is more electropositive than copper.
Magnesium lebih elektropositif daripada kuprum.
P3 – Ability of magnesium to release electrons is higher than copper.
Keupayaan magnesium untuk melepaskan elektron lebih tinggi
daripada kuprum.
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(b)(i) P1 - Number of mole for HCl / Bilangan mol HCl
= 0.5 x 100/1000
= 0.05 mol
P2 - Number of mole for NaOH / Bilangan mol NaOH
= 1.0 x 100/1000
= 0.10 mol
P3 - Sodium hydroxide solution / Larutan natrium hidroksida
P4 - Heat change / Perubahan haba
= (100 + 100)(4.2)(31.3 – 28)
= 2772 J
= 2.772 kJ

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