Electrolysis of Molten Electrolytes recap

In this circuit, the electrons flow

• clockwise

• anti-clockwise

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The electrons flow out of the negative terminal of the battery, and hence flow anti-clockwise. Out of the hotspots indicated in the diagram, choose one where you are likely to find these electrons that flow out of the battery

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Why are platinum or graphite electrodes used?

• Because they are inert

• because they are reactive

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The mobile ions in the electrolyte are only magnesium and oxide ions. This must mean that the electrolyte is

• Molten magnesium oxide

• Aqueous magnesium oxide

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To which electrode do the ions migrate?

Magnesium ions - (a)  

Oxide ions - (b)  

• Left electrode
• Right electrode

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The magnesium ions migrate to the left electrode. Which is the correct ionic half-equation for the reaction that takes place?

• Mg²⁺(l) + 2e -> Mg(l)

• Mg²⁺(l) -> Mg(l) + 2e

• Mg(l) -> Mg²⁺(l) + 2e

• Mg(l) + 2e -> Mg²⁺(l)

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The correct ionic half-equation is shown. This is a (a)   process that occurs at the ​ (b)  

• reduction
• oxidation
• neutralization
• cathode
• anode

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The ionic half-equation for the oxidation process is

• 2O^2-(l) -> O₂(g) + 4e

• O^2-(l) -> O₂(g) + 2e

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The overall equation for this electrolysis process is

• 2MgO(l) -> 2Mg(l) + O₂(g)

• MgO(l) -> Mg(l) + O₂(g)

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How is your understanding of this topic so far?

• 🫠 What is this sorcery?

• 🤯 My brain is buffering...

• 😅 Getting there (I think?)

• 🧐 Ah, I see what you did there!

• 🧠 I am the master now.

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