Half Equations in Electrolysis (OCR GCSE Chemistry A, Combined (Gateway Science Suite)): Flashcards

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Half Equations in Electrolysis
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What do half equations represent in electrolysis?

Oxidation or reduction processes at electrodes

Electrode where reduction occurs

Cathode

Electrode where oxidation occurs

Anode

What do ions do at the cathode?

Gain electrons

What do ions do at the anode?

Lose electrons

Cathode half equation for Al2O3Al_2O_3 electrolysis

Al3++3e−→AlAl^{3+} + 3e^- \rightarrow Al

Anode half equation for Al2O3Al_2O_3 electrolysis

2O2−→O2+4e−2O^{2-} \rightarrow O_2 + 4e^-

Electrons gained by Al3+Al^{3+} ion at cathode

Three electrons

Gas formed at anode from O2−O^{2-} ions

Oxygen gas (O2O_2)

What must be balanced in half equations?

Charges on both sides

Three industrial uses of electrolysis

Metal extraction, electroplating, chlorine & hydrogen production

Explore OCR GCSE Chemistry A, Combined (Gateway Science Suite) Revision Notes by Topics

Reactivity of Metals

Reactions of Acids

Electrolysis

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Reactivity of Metals

Reactions of Acids

Electrolysis

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Reactivity of Metals

Reactions of Acids

Electrolysis

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Reactivity of Metals

Reactions of Acids

Electrolysis

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