Electrolysis (AQA GCSE Chemistry Combined Science): 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

Where oxidation occurs in electrolysis

At the anode

Where reduction occurs in electrolysis

At the cathode

What ions do at the cathode

Gain electrons

What ions do at the anode

Lose electrons

Cathode half equation for Al2O3Al_2O_3 electrolysis

Al3++3e−→Al(l)Al^{3+} + 3e^- \to Al(l)

Anode half equation for Al2O3Al_2O_3 electrolysis

2O2−→O2(g)+4e−2O^{2-} \to O_2(g) + 4e^-

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

Three electrons (3e−)(3e^-)

Electrons released by two O2−O^{2-} ions

Four electrons (4e−)(4e^-)

What must be balanced in half equations

Charges on both sides

Process at cathode involving electron gain

Reduction

Process at anode involving electron loss

Oxidation

Industries that use electrolysis

Metal extraction, electroplating, chemical production

Explore AQA GCSE Chemistry Combined Science Revision Notes by Topics

Reactivity of Metals

Reactions of Acids

Electrolysis

Explore AQA GCSE Chemistry Combined Science Model Answers by Topics

Reactivity of Metals

Reactions of Acids

Electrolysis

Explore AQA GCSE Chemistry Combined Science Quizzes by Topics

Reactivity of Metals

Reactions of Acids

Electrolysis

Explore AQA GCSE Chemistry Combined Science Exam Questions by Topics

Reactivity of Metals

Reactions of Acids

Electrolysis

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