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Answer for the clue "Adsorption (especially when irreversible) by means of chemical instead of physical forces ", 13 letters:
chemisorption

Word definitions for chemisorption in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context chemistry English) the process in which a substance is adsorbed on the surface of another by means of chemical rather than physical bonding

Wikipedia Word definitions in Wikipedia
Chemisorption is a kind of adsorption which involves a chemical reaction between the surface and the adsorbate. New chemical bonds are generated at the adsorbant surface. Examples include macroscopic phenomena that can be very obvious, like corrosion , ...

WordNet Word definitions in WordNet
n. adsorption (especially when irreversible) by means of chemical instead of physical forces; "chemisorption of gaseous nitrogen on iron catalysts" [syn: chemosorption ]