= Chemisorption
<Chemisorption> is adsorption involving chemical bonding between an adsorbate and a surface. It changes the electronic interaction more specifically than a description based only on weak physical attraction.
For example, a reacting molecule can bind to a metal surface before undergoing a catalytic transformation. Bond formation can impose activation barriers and site selectivity, but chemisorption is not universally irreversible. Distinguishing binding strength, adsorption rate, and subsequent reaction is necessary when interpreting a surface experiment.
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