answer scheme on sample of essay question trial spm kedah 2010(sorry cannot insert the diagram)

(a) 1.Redox reaction is a chemical reaction where oxidation and reduction takes place simultaneously.
2.Half equation at negative terminal: Mg --> Mg²⁺ + 2e
3.So, oxidation occur at negative terminal.
4.Half equation at positive terminal: Cu²⁺ + 2e --> Cu
5.Reduction occurs at the positive terminal
6.Thus, the reaction in this cell is a redox reaction.

(b)

	Cell P	Cell Q
Energy change	Chemical energy to electrical energy	Electrical energy to chemical energy
Observation	Negative terminal: zinc plate becomes smaller/ mass of copper decreases Positive terminal: A brown solid is deposited// mass of copper decreases	Cathode: A brown solid is deposited// mass of copper decreases Anode: Anode/ copper plate dissolves
Half equation	Negative terminal: Zn --> Zn2+ + 2e Positive terminal: Cu2+ + 2e --> Cu	Cathode: Cu2+ + 2e --> Cu Anode: Cu --> Cu2+ + 2e

Procedure:
*Iron spoon is connected to the negative terminal on the battery while the silver plate is connected
to the positive terminal of the battery// Iron spoon is made as cathode while silver plate is made as
anode.
*Both plates are immersed into silver nitrate solution
*The circuit is completed

Functional apparatus set-up
Label correctly:
silver plate
silver nitrate solution
iron spoon

Observation: Grey/ silvery solid is deposited

Cathode: Ag⁺ + e --> Ag

Anode: Ag --> Ag⁺ + e

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