New Invariant Expressions in Chemical Kinetics.

Area of Science:

• Chemical Kinetics
• Physical Chemistry
• Thermodynamics

Background:

• Classical mass-action law models are foundational in chemical kinetics.
• Traditional invariances in chemical kinetics often rely on single experiments.
• Understanding reaction dynamics and equilibrium is crucial in chemistry.

Purpose of the Study:

• To present original theoretical and experimental results on chemical kinetics over the last decade.
• To introduce and detail two novel types of invariances in kinetic experiments.
• To demonstrate how these invariances relate to equilibrium constants and kinetic coefficients.

Main Methods:

• Theoretical derivation using classical mass-action law models.
• Experimental justification of theoretical findings.
• Analysis of a special battery of kinetic experiments, not just a single one.

Main Results:

• Identification of thermodynamic invariants, which are combinations of kinetic dependences yielding equilibrium constants.
• Discovery of "mixed" kinetico-thermodynamic invariances, involving both equilibrium constants and non-thermodynamic ratios of kinetic coefficients.
• Demonstration that these invariances are derived from a set of experiments.

Conclusions:

• The identified invariants provide new analytical tools for chemical kinetics.
• These findings extend the understanding of invariances beyond traditional single-experiment approaches.
• The results bridge theoretical models of chemical kinetics with experimental validation.