Atkins, de Paula & Friedman: Physical Chemistry: Quanta, Matter, and Change 2e
CRC Handbook of Chemistry and Physics
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Thermodynamics of Enzyme-catalysed Reactions
Extensive compilation of equilibrium constants for enzyme-catalyzed reactions. This is NIST Standard Reference Database 74.
Introduction to Catalysis
Good introduction to homogenous and heterogenous catalysis.
Tutorial and animations explaining catalysis.
Page explaining homogenous catalysis.
Tutorial on the Michaelis Menten equation, including interactive graph.