Electrolysis (AQA GCSE Chemistry): Flashcards

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Half Equations in Electrolysis
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What describes reactions at electrodes in electrolysis?

Half equations

Where does reduction occur in electrolysis?

At the cathode

Where does oxidation occur in electrolysis?

At the anode

What do ions do during reduction?

Gain electrons

What do ions do during oxidation?

Lose electrons

Cathode half equation for Al3+Al^{3+} in Al2O3Al_2O_3 electrolysis

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

Anode half equation for O2−O^{2-} in Al2O3Al_2O_3 electrolysis

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

How many electrons does Al3+Al^{3+} gain at cathode?

Three electrons (3e−3e^-)

How many electrons released when O2−O^{2-} oxidised to O2O_2?

Four electrons (4e−4e^-)

What must be balanced in half equations?

Charges

What happens at cathode (process and electron movement)?

Reduction - ions gain electrons

What happens at anode (process and electron movement)?

Oxidation - ions lose electrons

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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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Reactivity of Metals

Reactions of Acids

Electrolysis

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