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4. Electrochemistry

Cambridge IGCSE Chemistry (0620) · 7 topics

Electrolysis Principles

What is Electrolysis? Electrolysis is the decomposition of an ionic compound, molten or in aqueous solution, by the passage of an electric current through it.…
Electrolysis of Aqueous Solutions

Competition in Aqueous Electrolysis Water itself provides a small number of H⁺ and OH⁻ ions (from H₂O → H⁺ + OH⁻). So when an ionic compound is dissolved in…
Electrolysis of Molten Compounds

Electrolysing a Molten Binary Compound A binary ionic compound contains just two elements, e.g. NaCl, MgCl₂, PbBr₂. When molten, only the compound's own ions…
Electrolysis of Aqueous NaCl & H₂SO₄

Concentrated Aqueous Sodium Chloride (Brine) Concentrated aqueous NaCl (brine) is electrolysed using inert electrodes. Ions present: Na⁺, Cl⁻, H⁺, OH⁻. Cathode:…
Ionic Half Equations

Writing Half Equations A half equation shows the reaction at just one electrode - the gain or loss of electrons by an ion. Cathode (reduction): electrons appear…
Electroplating

Why Electroplate Objects? Electroplating uses electrolysis to coat an object with a thin layer of another metal. To improve appearance - a shiny, attractive…
Hydrogen-Oxygen Fuel Cells

What is a Hydrogen-Oxygen Fuel Cell? A hydrogen-oxygen fuel cell uses hydrogen and oxygen to produce electricity directly, with water as the only chemical…