The electrolysis of molten compounds
2 marks · HardWrite the half-equation for the reaction at the anode during the electrolysis of molten cadmium(II) iodide ( ).
Explain why this reaction is classified as oxidation.
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Also accept: ; Because electrons are lost at the anode
Common mistakes: Wrong charge or balancing; Calling it reduction
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Marking points
M1 · 1 mark · Writes correct anode half-equation:
B1 · 1 mark · Explains that this is oxidation because iodide ions lose electrons.
Worked solution
The half-equation at the anode is:
This is oxidation because each iodide ion loses one electron to form iodine molecules.