4.4.3.5 - Representation of reactions at electrodes as half equations

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5 Terms

1
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During electrolysis what happens at the cathode?

At the cathode (negative electrode), positively charged ions gain electrons

so the reactions are reductions.

2
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During electrolysis what happens at the anode?

At the anode, negatively charged ions lose electrons

So the reactions are oxidations.

3
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What can the reactions be represented by?

Half equations

4
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Give the half equation for the oxidation of hydrogen.

2H+ + 2e- → H2

5
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Give the half equation for the discharge of hydroxide ions.

4OH- (aq) → O2 (g) + 2H2O (l) + 4e-