The diagram shows a cell. This is a device which produces electrical energy. The reaction in a cell is a redox reaction and involves electron transfer.
i) Complete the sentence. A cell will change ................................................ energy into electrical energy.
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ii) In the left-hand beaker, the colour changes from brown to colourless. Complete the equation for the reaction.
Br2 + ............... → ...............
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iii) Is the change in (iii) oxidation or reduction? Give a reason for your choice.
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iv) Complete the following description of the reaction in the right-hand beaker. Fe2+ changes into ..........................
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v) When a solution of bromine is replaced by a solution of chlorine, the voltage increases. When a solution of bromine is replaced by a solution of iodine, the voltage decreases. Suggest an explanation for this difference.
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