Page 233 - MODUL KIMIA A+XPLOSIVE SPM (LATEST)

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Pent-2-ene // Pent-2-ena 1

10 marks
SECTION B
NO MARK SCHEME MARKS
7(a)(i) Cu, Y,X, W 1
(ii) P1 : Positive terminal/Terminal positif : Cu
P2 : Potential difference/Beza upaya : 1.3V
P3: Copper is less electropositive // X is more electropositive
Kuprum kurang elektropositif // X lebih elektropositif
* correct value and unit/ nilai dan unit betul 3
(iii) Because the distance between X and Cu is the furthest/ Kerana jarak antara X 1
dan Cu adalah paling jauh
(iv) P1: determine the terminals of a voltaic cell/menentukan terminal sel voltan
P2: determine the voltage produced by a pair of metals/menentukan voltan
yang dihasilkan oleh sepasang logam.
P3: predict the ability of a metal to displace another metal from its salt
solution/meramalkan keupayaan suatu logam untuk menyesarkan logam yang
lain daripada larutan garamnya.
*Any two/ mana-mana dua 2

7 ( b)(i) P1 Anode/Anod: Zn Cathode/Katod: Cu
1+1
P2 Anode/Anod: Cathode/Katod:
2+
2+
Zn → Zn +2e Cu +2e → Cu 1+1
P3 Anode/Anod: Cathode/Katod:
Zinc dissolves and becomes Copper becomes thicker/ 1+1
thinner/Zink menipis Kuprum menebal

P4 Zinc is oxidised/ Zink Copper(II) ion is reduced/ Ion 1+1
dioksidakan kuprum(II) dioksidakan
P5 Zinc act as reducing Copper(II) ion acts as
agent/Zink bertindak sebagai oxidizing agent/ Ion 1+1
agen penurunan kuprum(II) bertindak sebagai
agen pengoksidaan
2+
2+
P6 Zn + Cu → Zn + Cu
P1: Correct formula reactant & product/Formula bahan dan
hasil betul 1
P2: Balance equation/Persamaan seimbang

(b)(ii) Voltaic cell/Sel voltan Electrolytic cell/Sel elektrolisis
P1 Chemical energy change Electrical energy change to
to electrical energy chemical energy
Tenaga kimia bertukar Tenaga elektrik bertukar
kepada tenaga elektrik kepada tenaga kimia

Sektor Pembelajaran, Jabatan Pendidikan Negeri Sabah | 2020 232