Page 172 - MODUL KIMIA A+XPLOSIVE SPM (LATEST)

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

P3 – More heat energy is needed to overcome the attraction force in YCl 3
Lebih banyak tenaga haba diperlukan untuk mengatasi daya tarikan di
YCl

(iii) Light bulb in set B lights up because there are presence of free moving 1
ion.
Mentol di set B menyala kerana terdapat ion bebas bergerak.
10 marks
2. (a) Group 18 // Kumpulan 18 1
(b) Helium gas // gas helium 1

Explanation :
Lighter/ not easily burnt // Ringan /Tidak mudah terbakar 1
(c) (i) P1 – Nuclei attraction towards valence electron in atom Z is weaker // 1
Daya tarikan nucleus terhadap electron valens dalam atom Z lebih lemah
P2 – Z atom has a higher tendency to release one electron // Atom Z
mempunyai kecenderungan yang lebih tinggi untuk menderma elektron 1
(ii) T 2O + H 2O  2 TOH// 2
NaOH + H 2O  2 NaOH

P1- Correct formula of reactant and product
P2 – Balance equation
(iii) 2TOH + CO 2  T 2CO 3 + H 2O // 2
2NaOH + CO 2  Na 2CO 3 + H 2O

P1- Correct formula of reactant and product
P2 – Balance equation
(iv) R, Q, Y, X, T, Z 1
10 marks
3 (a) Chlorine gas r: formula 1
(b) (i) Add water // lower the concentration of the electrolyte 1
Tambahkan air // turunkan kepekatan elektrolit
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(ii)

OH ion is selectively discharged because it is lower than Cl ion in the 1

electrochemical series
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Ion OH dipilih untuk dinyahcas kerana lebih rendah daripada ion Cl
dalam siri elektrokimia.
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(iii) 4OH  2H 2O + O 2 + 4 e - 2
(iv) Purification of metal // Electroplating // Extraction of metal 1
Penulenan logam // Penyaduran logam // Pengekstrakan logam
(c) Zinc/ Electrode dissolves/ becomes thinner 1
Zink/ Elektrod terlarut/ menjadi lebi nipis
(d) In both cell, the blue intensity decrease. 1
Di kedua-dua Sel I, intensiti biru menurun sementara di Sel II.

Sektor Pembelajaran, Jabatan Pendidikan Negeri Sabah | 2020 171