Ch 5 covers surface chemistry — adsorption (physisorption and chemisorption), heterogeneous and homogeneous catalysis, enzyme catalysis, and colloidal systems (preparation, properties, coagulation).
Adsorption: accumulation on surface (adsorbent = solid, adsorbate = gas/liquid). Physisorption: weak van der Waals forces, reversible, multi-layer. Chemisorption: strong chemical bonds, irreversible, monolayer. Freundlich isotherm: x/m = kP^(1/n). Langmuir: monolayer assumption.
Catalysts lower Ea without being consumed. Homogeneous: same phase (acid catalysis). Heterogeneous: different phase (Haber process: Fe catalyst). Colloids: particle size 1–1000 nm. Tyndall effect (light scattering), Brownian motion, electrophoresis. Coagulation by electrolytes: Hardy-Schulze rule.
Download: https://ncert.nic.in/textbook/pdf/lech105.pdf | Part I: https://ncert.nic.in/textbook/pdf/lech1ps.zip
Adsorption: substance accumulates on the surface of another (e.g., gas on charcoal surface). Absorption: substance is uniformly distributed throughout the bulk (e.g., water absorbed by sponge). When both occur simultaneously, it's called sorption.
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