Studying Energy Transfer, Entropy, and the Velocity of Chemical Reactions A Review of Using Physical Models

Abstract

Chemical reactions are fundamental transformations in the nature of matter through the re-arrangements of chemical bonds and transfer of energy at the molecular level. The study of energy transfer, entropy and rate of a reaction are interrelated that helps to determine whether a reaction may take place or not and whether it will proceed in forward direction or reverse. Besides, these three topics are helpful to determine the rate of a reaction. The energy transfer relates to the ability of the reactant molecules to surmount activation barriers. This, in turn, occurs through molecular collisions and their resultant vibrations as well as electronic rate.... The collision theory, a classical theory, and quantum theory deal with the regard to the impact of energy distribution on reaction path. Entropy is a measure of disorder or dispersal of energy within a system. It is a measure to examine whether a reaction is spontaneous or not. Entropy gains occur owing to molecular rearrangements, particle number changes or phase changes. The Gibbs free energy quantitatively integrates these contributions, which measures the thermodynamic favorability of a given process. The kinetics of the reactions is another area of study of chemistry. It studies the rate of the reaction and how it varies with time after the start of the reaction. Also, it depends on temperature, concentration of reactants, and catalyst presence. The Arrhenius equation and transition state theory provide molecular-level insights into reaction rates and the nature of activation energy barriers. Chemical research today utilizes an integrated approach involving many physical concepts, mathematical expressions, and computational simulations of these concepts, resulting in better prediction and control of chemical behavior. Theoretical research can be used in the field of catalysis, environmental chemistry, biological processes, industrial production, and so on, for optimisation and sustainability. Modeling and simulation techniques are coming along at a fast pace which helps us understand various chemical systems. With these enhancements, we can also develop new innovations in materials science and energy technologies.