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Reaction Kinetics Reaction kinetics , also known as chemical kinetics , is the field of chemistry that investigates the rates of chemical reactions  and the molecular processes that govern these rates . It aims to quantify how quickly reactants are transformed into products and to elucidate the mechanistic pathways through which reactions occur. At the core of reaction kinetics is the rate law , an experimentally determined equation that expresses the reaction rate as a funct

Thermochemistry Overview Thermochemistry is the study of heat energy changes that occur during chemical reactions and physical transformations. It bridges chemistry and thermodynamics, focusing on the energy flow between chemical systems and their surroundings. Key Concepts Enthalpy (H) Heat content of a system at constant pressure ΔH = heat absorbed or released during a reaction Exothermic reactions: ΔH < 0 (release heat) Endothermic reactions: ΔH > 0 (absorb heat) Hess's La

Photochemistry in Physical Chemistry Photochemistry  is a branch of physical chemistry that studies the chemical effects of light. It focuses on how molecules absorb photons and undergo electronic excitation , leading to chemical reactions that would not occur under ordinary thermal conditions. Key Concepts Absorption of Light Molecules can absorb light at specific wavelengths, promoting electrons from a ground state  to an excited state . The energy of the absorbed photon mu