Chemical Kinetics & Catalysis
5 terms
Photochemical Quantum Yield
Chemical Kinetics & Catalysis
Dimensionless
The number of molecules reacting for each photon of light absorbed by the system.
Φ = molecules reacted / photons absorbed
Physisorption
Chemical Kinetics & Catalysis
kJ/mol
Weak adsorption in which molecules are held to a surface by van der Waals forces alone.
ΔH ≈ −20 to −40 kJ/mol
Pre-exponential Factor
Chemical Kinetics & Catalysis
Various
The constant A in the Arrhenius equation, representing the frequency of appropriately oriented collisions.
A = pZ
Promoter
Chemical Kinetics & Catalysis
Dimensionless
A substance that has little catalytic activity itself but greatly increases the effectiveness of a catalyst.
Pseudo-First-Order Reaction
Chemical Kinetics & Catalysis
s⁻¹
A higher-order reaction that behaves as first order because one reactant is present in such large excess that its concentration is effectively constant.
rate = k′[A], k′ = k[B]₀