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Chemistry Form 4 • MODULE
(a) State the name of the substance used as / Nyatakan nama bahan yang dijadikan sebagai:
electrode X / elektrod X : Impure copper
electrode Y / elektrod Y : Pure copper
electrolyte Z / elektrolit Z : Copper(II) sulphate solution
(b) Write the half equation that occur at the / Tuliskan persamaan setengah yang berlaku di
2+
2+
electrode X / elektrod X : Cu Cu + 2e electrode Y / elektrod Y : Cu + 2e Cu
(c) What are the observations at the / Apakah pemerhatian di
electrode X / elektrod X : Electrode becomes thinner
electrode Y / elektrod Y : Brown solid deposited
4 To purify metal an impure metal / Untuk menulenkan logam tak tulen:
(a) The impure metal is used as the anode / Logam tak tulen dijadikan sebagai anod.
(b) The pure metal is used as the cathode / Logam tulen dijadikan sebagai katod.
(c) The electrolyte used is an salt solution containing the ions of the purifying metal.
Elektrolit adalah larutan garam yang mengandungi ion logam yang hendak ditulenkan.
5 A student intends to electroplate an iron spoon with copper. Describe a laboratory experiment to electroplate the iron
ring. Your answer should involve the following:
Seorang pelajar bercadang untuk menyadurkan sebatang sudu besi dengan kuprum. Huraikan satu eksperimen di dalam makmal untuk
menyadur sebatang sudu besi. Jawapan anda perlu mengandungi:
– A labelled diagram showing the set-up of apparatus / Rajah berlabel menunjukkan susunan radas.
– Procedure / Kaedah.
– Half equation for the reactions at both electrodes / Persamaan setengah untuk tindak balas di kedua-dua elektrod.
– Observation at both electrodes / Pemerhatian di kedua-dua elektrod.
Answer / Jawapan:
Copper
Iron spoon
Copper(II) nitrate solution
Procedure / Kaedah:
(a) Copper plate and iron spoon are cleaned with sand paper .
Kepingan kuprum dan sudu besi dibersihkan dengan kertas pasir .
(b) Copper(II) nitrate solution is poured into a beaker until half full .
Larutan kuprum(II) nitrat dituangkan ke dalam bikar sehingga separuh penuh .
(c) Iron spoon is then connected to the negative terminal of battery while the copper plate is connected to the
positive terminal of the battery// Iron spoon is made as cathode while copper plate is made as anode.
Sudu besi disambungkan kepada terminal negatif bateri dan kepingan kuprum disambungkan kepada terminal positif
bateri// Sudu besi dijadikan katod dan kepingan kuprum dijadikan anod.
(d) The iron spoon and the copper plate are dipped in the copper(II) nitrate solution as shown in the diagram.
Sudu besi dan plat kuprum dicelup ke dalam larutan kuprum(II) nitrat seperti ditunjukkan dalam rajah.
(e) The circuit is completed / Litar dilengkapkan .
2+
(f) Half equation at the cathode / Persamaan setengah di katod : Cu + 2e Cu .
(g) Observation of the cathode: Brown solid is deposited / Pemerhatian di katod: pepejal perang terenap.
2+
(h) Half equation at the anode / Persamaan setengah di anod : Cu Cu + 2e .
(i) Observation of the anode / Pemerhatian di anod : Copper plate becomes thinner .
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05-Chem F4 (3P).indd 103 12/9/2011 5:56:30 PM
