SPM Chemistry 2017 (Q8)

Question

8 . (a) Diagram 6.1 shows the reaction occurred in a voltaic cell using magnesium ribbon and copper plate as electrodes. Based on Diagram 6.1, explain how electrical current is produced.

Rajah 6.1 menunjukkan tindak balas yang berlaku dalam suatu sel voltan menggunakan pita magnesium dan kepingan kuprum sebagai elektrod. Berdasarkan Rajah 6.1, terangkan bagaimana arus elektrik terhasil.

 

(b) Bar char in Diagram 6.2 shows the voltage of three chemical cells using different pairs of metals as electrodes.
Carta bar dalam Rajah 6.2 menunjukkan nilai voltan bagi tiga sedl kimia menggunakan pasangan logam berbeza sebagai elektrod.

(i) Based on Diagram 6.2 determine,

Berdasarkan Rajah tentukan,

  • Position of R in electrochemical series

Kedudukan R dalam sisi elektrokimia

  • Voltage and negative terminal when R and copper are used as electrode

Nilai voltan dan terminal negatif apabila R dan kuprum digunakan sebagai elektrod.

(ii) give one reason for the above statement and write the chemical equation involved.

Berikan satu alas an bagi penyataan di atas dan tulis persamaan kimia terlibat.

Cher Questions Solution Bank Rumusan Jawapan SPM & IGCSE Questions Answers Solution

Cher Questions Solution Bank Rumusan Jawapan SPM & IGCSE Questions Answers Solution

(c) (i) Based on Table 3: Explain why there are differences in the observation at anode for

Berdasarkan Jadual 3: Terangkan mengapap terdapat perbezaan dalam permehatian di anod bagi

– Cell I and Cell II

– Cell I and Cell III

(ii) In Cell III, the blue colour of copper(II) chloride solution remains unchanged. Explain why.

Dalam Sel III, warna biru larutan kuprum(II) klorida tidak berubah. Terangkan mengapa.

Cher Questions Solution Bank Rumusan Jawapan SPM & IGCSE Questions Answers Solution

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