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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

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 ]

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 , ...