: OXIDATION AND REDUCTION (SECTION A)
SET 2 : OXIDATION AND REDUCTION (SECTION A)
1. Diagram 1.1 shows two chemical cells. P and Q are electrodes of cell 1 while R and S are electrodes of cell 2. Rajah
1.1 menunjukkan dua buah sel kimia.P dan Q ialah elektrod bagi sel 1 manakala R dan S ialah elektrod bagi sel 2.
Copper Zinc
kuprum zink Magnesium
Q Copper
kuprum Porous
Magnesium
pot Pasu
sulphate solution Larutan magnesium
Zinc sulphate sulfat
berliang
Copper(II) sulphate
Copper(II)
solution
solution
sulphate solution
Larutan kuprum(II)
Larutan zink
larutan kuprum(II)
sulfat
sulfat
sulfat Cell 1/Sel 1
Cell 2 /Sel 2
Diagram 1.1/Rajah 1.1
(a) What is function of porous pot? Apakah fungsi pasu berliang ?
………………………………………………………………………………………… [ 1 mark]
(b) State energy change that occur in cell 1 and cell 2. Nyatakan perubahan tenaga yang berlaku dalam sel 1 dan sel 2.
………………………………………………………………………………………… [ 1 mark ] (c ) In Diagram 1.1, mark positive electrode and negative electrode for cell 1 and cell 2. Dalam Rajah
1.1, tandakan electrod positif dan elektrod negatif bagi sel 1 dan sel 2. [1 mark] (d) Based on cell 1; Berdasarkan sel 1;
(i)
Why electrons flow from P to Q? Mengapakah elektron mengalir daripada P ke Q?
………………………………………………………………………… [1 mark] (ii)
State the colour change of solution in porous pot. Give a reason for your answer. Nyatakan perubahan warna larutan dalam pasu berliang . Berikan sebab bagi jawapan anda .
…………………………………………………………………………… [2 marks]
(iii)
Write half-equation for the reaction at P. Tuliskan persamaan setengah bagi tindak balas di P.
……………………………………………………………………………. [1 mark]
(iv)
State the type of reaction occur at P. Nyatakan jenis tindak balas yang berlaku di P.
…………………………………………………………………………… [1 mark] (e) Based on cell 2; Berdasarkan sel ;
(i)
State the observation at R Nyatakan pemerhatian di R. …………………………………………………………………………….
[1 mark ] (ii)
State the substance acting as reducing agent. Give a reason for your answer. Nyatakan bahan yang bertindak sebagai agen penurunan. Berikan sebab bagi jawapan anda .
[2 marks]
2. Diagram 2.1 show the apparatus set up used in two sets of experiment to investigate the redox reaction. Rajah
2.1 menunjukkan susunan radas yang digunakan dalam dua set eksperimen untuk mengkaji tindak balas redoks.
Diagram 2.1/ Rajah 2.1
(a) What is meant by redox reaction? Apakah yang dimaksudkan dengan tindak balas redoks ?
[1 mark] (b)
Based on Set 1/ Berdasarkan Set 1;
(i)
State the colour change of iron(II) sulphate solution. Nyatakan perubahan warna larutan ferum(II) sulfat .
………………………………………………………………………… [1 mark]
(ii)
State the type of reaction occur to iron(II) sulphate. Nyatakan jenis tindak balas yang berlaku kepada ferum(II)sulfat.
Write half equation for the reaction in (a)(ii). Tuliskan persamaan setengah bagi tindak balas di (a)(ii).
[1 mark] (iv)
State the oxidation number of bromine in bromine water.
Nyatakan nombor pengoksidaan bromin dalam air bromin.
[1 mark] (c) Based on Set 2 ; Berdasarkan Set 2:
(i) Which substance undergoes oxidation? Bahan yang manakah mengalami pengoksidaan ?
………………………………………………………………………….. [1 mark] (ii) Write the ionic equation for the reaction occur. Tuliskan persamaan ion bagi tindak balas yang berlaku .
…………………………………………………………………………… [1 mark] (iii) State the change in oxidation number of iron. Nyatakan perubahan dalam nombor pengoksidaan bagi ferum .
……………………………………………………………………………. [1 mark]
(d) Iron is a metal that rust easily. Draw a labeled diagram to show how the conditions for the rusting involve the ionization of iron and the flow of electron. Lukiskan satu gambar rajah berlabel untuk menunjukkan bagaimana syarat untuk pengaratan besi melibatkan pengionan besi dan pengaliran elektron .
[3 marks]