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Chemical Kinetics & Catalysis

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Half-Life of a Reaction Chemical Kinetics & Catalysis s The time required for the concentration of a reactant to fall to half its initial value. t½ = 0.693 / k (first order) Heterogeneous Catalysis Chemical Kinetics & Catalysis Dimensionless Catalysis in which the catalyst is in a different phase from the reactants, usually a solid with gaseous or liquid reagents. Homogeneous Catalysis Chemical Kinetics & Catalysis Dimensionless Catalysis in which the catalyst is in the same phase as the reactants.