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An endothermic process is a chemical or physical process that absorbs heat from its surroundings. Learn the definition, examples, and distinction from exothermic and endotherm terms.
An exothermic process is a thermodynamic process or reaction that releases energy to its surroundings, usually in the form of heat. Learn about the definition, examples, and implications of exothermic reactions in chemistry and other fields.
An exothermic reaction is a chemical reaction that releases heat and has a negative enthalpy change. Learn about examples, measurement, and the difference between exothermic and endothermic reactions.
An endotherm is an organism that maintains its body temperature by internal heat production, mainly through metabolism. Learn about the origin, mechanisms and examples of endothermy in animals, and the pros and cons of an endothermic metabolism.
Hammond's postulate is a hypothesis in physical organic chemistry that describes the geometric structure of the transition state in a reaction. It states that the structure of the transition state resembles that of the species nearest to it in free energy, which can be used to explain and rationalize the Bell–Evans–Polanyi principle and reaction coordinate diagrams.
The Van 't Hoff equation relates the change in the equilibrium constant of a chemical reaction to the change in temperature and the standard enthalpy change. Learn how to use the equation, the Van 't Hoff plot, and the Van 't Hoff isotherm to estimate thermodynamic properties of reactions.
An energy profile is a theoretical representation of a chemical reaction or process as a single energetic pathway along the reaction coordinate. Learn how potential energy surfaces, degrees of freedom, and stationary points are used to derive and characterize energy profiles.
Thermochemistry is the study of the heat energy associated with chemical reactions and phase changes. Calorimetry is the measurement of heat changes using an enclosed chamber. Learn the difference between thermochemistry and calorimetry from this article.