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ElectroWang

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Chemisorption is a type of adsorption whereby a molecule adheres to a surface through the formation of a chemical bond, as opposed to the Van der Waals forces which cause physisorption. It is characterised by:

High temperatures.
Type of interaction: strong; covalent bond between adsorbate and surface.
High enthalpy: 50 kJ/mol <¦¤H< 800 kJ/mol
Adsorption takes place only in a monolayer.
High activation energy
Increase in electron density in the adsorbent-adsorbate interface.
Reversible only at high temperature.
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