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Chemical Kinetics & Catalysis

5 terms


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Chemical Kinetics & Catalysis

Photochemical Quantum Yield

The number of molecules reacting for each photon of light absorbed by the system.

Φ = molecules reacted / photons absorbed Dimensionless
Chemical Kinetics & Catalysis

Physisorption

Weak adsorption in which molecules are held to a surface by van der Waals forces alone.

ΔH ≈ −20 to −40 kJ/mol kJ/mol
Chemical Kinetics & Catalysis

Pre-exponential Factor

The constant A in the Arrhenius equation, representing the frequency of appropriately oriented collisions.

A = pZ Various
Chemical Kinetics & Catalysis

Promoter

A substance that has little catalytic activity itself but greatly increases the effectiveness of a catalyst.

Dimensionless
Chemical Kinetics & Catalysis

Pseudo-First-Order Reaction

A higher-order reaction that behaves as first order because one reactant is present in such large excess that its concentration is…

rate = k′[A], k′ = k[B]₀ s⁻¹