Entropy of activation

{
  "id": "MLC-T-CHM-003965",
  "term": "Entropy of activation",
  "field": "Chemistry",
  "definition": "The difference in entropy between the activated complex and the ground state of the reactants, denoted as ΔS‡. This value reflects the change in the degree of order or disorder when reactants form the transition state. A negative value indicates a more ordered transition state relative to the reactants, while a positive value indicates a less ordered one.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "enthalpy of activation",
    "entropy"
  ],
  "references": [
    "PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1113 (https://doi.org/10.1351/pac199466051077)",
    "PAC, 1996, 68, 149. 'A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)' on page 165 (https://doi.org/10.1351/pac199668010149)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/entropy-of-activation/"
}