Electrolysis
ICSE · Class 10 · Chemistry
Quick revision notes for Electrolysis — ICSE Class 10 Chemistry. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Electrical Conductors and Electrolytes
- Electrical conductors allow passage of electric current - include metals and ionic solutions
- Electronic conductors (metals) conduct through electron movement
- Electrolytic conductors conduct through ion movement in molten state or aqueous solution
Electrodes, Cells, and Ions
- Electrodes are metal plates/graphite rods used for passing current
- Anode: positive electrode where oxidation occurs (electron loss)
- Cathode: negative electrode where reduction occurs (electron gain)
Electrochemical Series and Selective Discharge
- Electrochemical series arranges metals by their tendency to lose electrons
- Li > K > Ca > Na > Mg > Al > Zn > Fe > Ni > Sn > Pb > H > Cu > Ag > Au > Pt
- Metals higher in series lose electrons more easily
Examples of Electrolysis
- Molten PbBr₂: Pb at cathode, Br₂ at anode using graphite electrodes
- Acidified water: H₂ at cathode, O₂ at anode in 2:1 ratio using Pt electrodes
- CuSO₄ with Cu electrodes: Cu deposits at cathode, anode dissolves
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