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

📚Flashcards
Revision NotesModel AnswersQuizzesFlashcardsExam Questions
Half Equations in Electrolysis
Sign up to keep revising.Create a free account to study more flashcards and track your progress.

Practise the cards

12 cards from this deck

Show

What are half equations in electrolysis?

Equations showing oxidation/reduction at each electrode

Electrode where reduction occurs

Cathode

Electrode where oxidation occurs

Anode

Cathode half equation for Al2O3Al_2O_3 electrolysis

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

What Al3+Al^{3+} ions do at cathode

Gain electrons to form Al metal

Anode half equation for Al2O3Al_2O_3 electrolysis

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

What O2−O^{2-} ions do at anode

Lose electrons to form O2O_2 gas

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

Three electrons (3e−3e^-)

Reduction definition

Ions gain electrons

Oxidation definition

Ions lose electrons

What must balance in half equations

Charges on both sides

3 industries using electrolysis

Metal extraction, electroplating, chemical production

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

Reactivity of Metals

Reactions of Acids

Electrolysis

Explore OCR GCSE Chemistry A (Gateway Science Suite) Model Answers by Topics

Reactivity of Metals

Reactions of Acids

Electrolysis

Explore OCR GCSE Chemistry A (Gateway Science Suite) Quizzes by Topics

Reactivity of Metals

Reactions of Acids

Electrolysis

Explore OCR GCSE Chemistry A (Gateway Science Suite) Exam Questions by Topics

Reactivity of Metals

Reactions of Acids

Electrolysis

Join 100,000+ GCSE students studying Flashcards with us.

Select your subjects, and get access to A+ resources today.