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An ordered network of elementary or effective steps proposed to account for products, intermediates, kinetics, stereochemistry, and isotope effects.
wp-chem-chemical-kineticsopenstax-chemistry-2edoe-catalystsEach relation below ends at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
A catalytic mechanism models an alternative reaction cycle that regenerates catalyst and changes accessible kinetic pathways; the proposed steps require independent kinetic and structural evidence.
The target is a model, idealization, restricted ansatz, approximation scheme, phenomenological fit, or historical representation used for the source system or theory. It need not have a universal small error parameter and is not thereby a controlled limit or effective theory. The edge label and detail must identify the precise status.
wp-chem-chemical-kineticsopenstax-chemistry-2edoe-catalystsThis is an authored directed relation from the source endpoint to the target endpoint.
A mechanism is assembled from elementary or explicitly coarse-grained steps connected by intermediates.
The source is a material constituent, structural component, or underlying quantum field whose excitation realizes the target physical system or particle. The edge label and detail must distinguish composition from field excitation; neither implies a simple classical sum of parts.
wp-chem-chemical-kineticsopenstax-chemistry-2edoe-catalystsThis is an authored directed relation from the source endpoint to the target endpoint.
Oxidative addition is one elementary organometallic step that must be embedded in a balanced catalytic mechanism.
The source is a material constituent, structural component, or underlying quantum field whose excitation realizes the target physical system or particle. The edge label and detail must distinguish composition from field excitation; neither implies a simple classical sum of parts.
wp-chem-inorganic-chemistryiupac-red-bookiupac-gold-bookThis is an authored directed relation from the source endpoint to the target endpoint.
Intermediates are produced and consumed within mechanisms and require evidence distinguishing them from transition states and resting states.
The source is a material constituent, structural component, or underlying quantum field whose excitation realizes the target physical system or particle. The edge label and detail must distinguish composition from field excitation; neither implies a simple classical sum of parts.
wp-chem-organic-chemistryiupac-blue-bookpubchem-docsEach relation below starts at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
Addition reactions may be polar, radical, pericyclic, surface-mediated, or catalytic and require mechanism-specific evidence.
A theory, law, or interaction describes the behavior of the target within a stated regime. The edge detail must state important limits or qualifications.
wp-chem-chemical-kineticsopenstax-chemistry-2edoe-catalystsThis is an authored directed relation from the source endpoint to the target endpoint.
A net chemical equation is a coarse representation of a mechanism that preserves overall stoichiometry but omits elementary steps, intermediates, rates, and pathway branching.
The target is a model, idealization, restricted ansatz, approximation scheme, phenomenological fit, or historical representation used for the source system or theory. It need not have a universal small error parameter and is not thereby a controlled limit or effective theory. The edge label and detail must identify the precise status.
wp-chem-stoichiometryopenstax-chemistry-2eiupac-gold-bookThis is an authored directed relation from the source endpoint to the target endpoint.
Elimination mechanisms differ in molecularity, base dependence, stereoelectronic requirements, and competition with substitution.
A theory, law, or interaction describes the behavior of the target within a stated regime. The edge detail must state important limits or qualifications.
wp-chem-chemical-kineticsopenstax-chemistry-2edoe-catalystsThis is an authored directed relation from the source endpoint to the target endpoint.
A proposed mechanism can assign rate control only after concentrations, reversibility, pre-equilibria, catalyst state, and the sensitivity of the overall flux to each elementary rate constant are specified.
The target represents a state, property, observable, or state-dependent description associated with the source system or theory.
wp-chem-chemical-kineticsopenstax-chemistry-2edoe-catalystsThis is an authored directed relation from the source endpoint to the target endpoint.
A proposed mechanism yields a rate law only after approximations, conservation equations, and initial conditions are stated.
A theory, law, or interaction describes the behavior of the target within a stated regime. The edge detail must state important limits or qualifications.
wp-chem-chemical-kineticsopenstax-chemistry-2edoe-catalystsThis is an authored directed relation from the source endpoint to the target endpoint.
The steady-state approximation reduces mechanism equations when selected intermediates remain at low, slowly varying concentrations.
The target is a model, idealization, restricted ansatz, approximation scheme, phenomenological fit, or historical representation used for the source system or theory. It need not have a universal small error parameter and is not thereby a controlled limit or effective theory. The edge label and detail must identify the precise status.
wp-chem-chemical-kineticsopenstax-chemistry-2edoe-catalystsThis is an authored directed relation from the source endpoint to the target endpoint.
Substitution can proceed by several stepwise or concerted mechanisms distinguished by kinetics, stereochemistry, and intermediate evidence.
A theory, law, or interaction describes the behavior of the target within a stated regime. The edge detail must state important limits or qualifications.
wp-chem-chemical-kineticsopenstax-chemistry-2edoe-catalysts