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SPM Chemistry A xplosive Module (Chemistry A Ticket For “U”) RED ZONE [RZ]

Section B / Bahagian B
[20 marks] / [20 markah]

Answer any one question form this section.
Jawab mana – mana satu soalan daripada bahagian ini.

7 (a) Table 7.1 shows a series of experiment carried out to construct the electrochemical series.
The positive terminal and value for potential difference for the pair of metals X and copper,
Cu are not given. W, X and Y are not the actual symbols of the metals.
Jadual 7.1 menunjukkan keputusan satu siri eksperimen yang dijalankan untuk membina
siri elektrokimia.
Terminal positif dan nilai beza keupayaan logam X dan kuprum, Cu tidak diberi. W, X dan
Y bukan simbol sebenar logam-logam itu.
Pair of metals Positive terminal Potential
Pasangan logam Terminal positif difference (V)
Beza
keupayaan (V)
W, X X 1.6

X, Y Y 0.4
W, Cu Cu 2.9
X, Cu
Table 7.1 / Jadual 7.1

(i) Based on the values of the potential differences, arrange the metals in ascending
order in the electrochemical series.
Berdasarkan nilai beza keupayaan, susun logam-logam tersebut dalam
tertib menurun dalam siri elektrokimia.

[1M]
(ii) Predict the positive terminal and the value of potential difference for the pair of
metals X and Cu. Explain your answer.
Ramal terminal positif dan nilai beza keupayaan untuk pasangan logam X dan Cu.
Terangkan jawapan anda.
[3M]

(iii) The potential difference for the pair of metals W and Cu is the greatest. Explain your
answer.
Beza upaya bagi pasangan logam W dan Cu adalah terbesar. Terangkan jawapan
anda.
[1M]
(iv) State two importance of electrochemical series.
Nyatakan dua kepentingan siri elektrokimia.
[2M]

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